WHITEHORSE FINANCE, INC., 10-Q filed on 5/12/2025
Quarterly Report
v3.25.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2025
May 05, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
Document Transition Report false  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-31  
Entity File Number 814-00967  
Entity Registrant Name WHITEHORSE FINANCE, INC  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 45-4247759  
Entity Address, Address Line One 1450 Brickell Avenue  
Entity Address, Address Line Two 31st Floor  
Entity Address, City or Town Miami  
Entity Address State Or Province FL  
Entity Address, Postal Zip Code 33131  
City Area Code 305  
Local Phone Number 381-6999  
Entity Current Reporting Status No  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   23,243,088
Entity Central Index Key 0001552198  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol WHF  
Security Exchange Name NASDAQ  
7.875% 2028 Notes    
Document Information [Line Items]    
Title of 12(b) Security 7.875% Notes due 2028  
Trading Symbol WHFCL  
Security Exchange Name NASDAQ  
v3.25.1
Consolidated Statements of Assets and Liabilities - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) $ 650,999 $ 642,213
Cash and cash equivalents 11,444 12,424
Restricted cash and cash equivalents 7,882 14,548
Restricted foreign currency (cost of $297 and $894, respectively) 295 864
Interest and dividend receivable 5,485 5,631
Amounts receivable on unsettled investment transactions 1,698 112
Prepaid expenses and other receivables 964 1,009
Unrealized appreciation on foreign currency forward contracts   20
Total assets 678,767 676,821
Liabilities    
Debt (net of unamortized debt issuance costs of $3,503 and $2,876, respectively) 361,133 353,117
Distributions payable 8,949 8,949
Management fees payable 2,833 2,932
Incentive fees payable 17,977 17,848
Amounts payable on unsettled investment transactions   3,539
Interest payable 3,591 1,821
Accounts payable and accrued expenses 2,461 2,141
Advances received from unfunded credit facilities 374 340
Total liabilities 397,318 390,687
Commitments and contingencies (See Note 8)
Net assets    
Common stock, 23,243,088 and 23,243,088 shares issued and outstanding, par value $0.001 per share, respectively, and 100,000,000 shares authorized 23 23
Paid-in capital in excess of par 337,205 337,205
Accumulated earnings (losses) (55,779) (51,094)
Total net assets 281,449 286,134
Total liabilities and total net assets $ 678,767 $ 676,821
Number of shares outstanding 23,243,088 23,243,088
Net asset value per share $ 12.11 $ 12.31
Non-controlled/non-affiliate company investments    
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) $ 512,787 $ 504,832
Non-controlled affiliate company investments    
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) 31,497 29,851
Controlled affiliate company investments    
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) $ 106,715 $ 107,530
v3.25.1
Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Consolidated Statements of Assets and Liabilities    
Investments, amortized cost $ 706,224 $ 695,240
Restricted foreign currency, cost 297 894
Unamortized debt issuance costs $ 3,503 $ 2,876
Common stock, shares authorized 100,000,000 100,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 23,243,088 23,243,088
Common stock, share outstanding 23,243,088 23,243,088
v3.25.1
Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investment income    
Total investment income $ 18,801 $ 25,475
Expenses    
Interest expense 6,185 7,330
Base management fees 2,833 3,116
Performance-based incentive fees 1,711 2,704
Administrative service fees 171 171
General and administrative expenses 953 1,047
Total expenses 11,853 14,368
Net investment income before excise tax 6,948 11,107
Excise tax 105 292
Net investment income after excise tax 6,843 10,815
Realized and unrealized gains (losses) on investments and foreign currency transactions    
Net realized gains (losses) (395) (5,615)
Foreign currency transactions (29) 9
Foreign currency forward contracts 22 (28)
Net realized gains (losses) (402) (5,634)
Net change in unrealized appreciation (depreciation) (2,198) 434
Translation of assets and liabilities in foreign currencies 41 302
Foreign currency forward contracts (20) 52
Net change in unrealized appreciation (depreciation) (2,177) 788
Net realized and unrealized gains (losses) on investments and foreign currency transactions (2,579) (4,846)
Net increase (decrease) in net assets resulting from operations $ 4,264 $ 5,969
Per Common Share Data    
Basic earnings (losses) per common share $ 0.18 $ 0.26
Diluted earnings (losses) per common share 0.18 0.26
Dividends and distributions declared per common share $ 0.39 $ 0.39
Basic weighted average common shares outstanding 23,243,088 23,243,088
Diluted weighted average common shares outstanding 23,243,088 23,243,088
Non-controlled/non-affiliate company investments    
Investment income    
Interest income $ 13,948 $ 17,961
Payment-in-kind income 533 1,789
Fee income 483 648
Dividend income 13 18
Realized and unrealized gains (losses) on investments and foreign currency transactions    
Net realized gains (losses) (395) (5,615)
Net change in unrealized appreciation (depreciation) (2,064) 10,713
Non-controlled affiliate company investments    
Investment income    
Interest income   24
Payment-in-kind income 158 157
Realized and unrealized gains (losses) on investments and foreign currency transactions    
Net change in unrealized appreciation (depreciation) 681 (10,010)
Controlled affiliate company investments    
Investment income    
Interest income 2,284 2,496
Payment-in-kind income   86
Dividend income 1,382 2,296
Realized and unrealized gains (losses) on investments and foreign currency transactions    
Net change in unrealized appreciation (depreciation) $ (815) $ (269)
v3.25.1
Consolidated Statements of Changes in Net Assets (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Increase (Decrease) in Stockholders' Equity    
Beginning Balance $ 286,134 $ 316,772
Beginning Balance (in shares) 23,243,088  
Net increase in net assets resulting from operations:    
Net investment income after excise tax $ 6,843 10,815
Net realized gains (losses) on investments and foreign currency transactions (402) (5,634)
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions (2,177) 788
Distributions declared (8,949) (8,949)
Ending Balance $ 281,449 313,792
Ending Balance (in shares) 23,243,088  
Common Stock    
Increase (Decrease) in Stockholders' Equity    
Beginning Balance $ 23 $ 23
Beginning Balance (in shares) 23,243,088 23,243,088
Net increase in net assets resulting from operations:    
Ending Balance $ 23 $ 23
Ending Balance (in shares) 23,243,088 23,243,088
Paid-in Capital in Excess of Par    
Increase (Decrease) in Stockholders' Equity    
Beginning Balance $ 337,205 $ 338,275
Net increase in net assets resulting from operations:    
Ending Balance 337,205 338,275
Accumulated Earnings (Losses)    
Increase (Decrease) in Stockholders' Equity    
Beginning Balance (51,094) (21,526)
Net increase in net assets resulting from operations:    
Net investment income after excise tax 6,843 10,815
Net realized gains (losses) on investments and foreign currency transactions (402) (5,634)
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions (2,177) 788
Distributions declared (8,949) (8,949)
Ending Balance $ (55,779) $ (24,506)
v3.25.1
Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities    
Net increase in net assets resulting from operations $ 4,264 $ 5,969
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by / (used in) operating activities:    
Payment-in-kind income (691) (2,032)
Net realized (gains) losses on investments 395 5,615
Net unrealized (appreciation) depreciation on investments 2,198 (434)
Net unrealized (appreciation) depreciation on translation of assets and liabilities in foreign currencies (41) (302)
Net unrealized (appreciation) depreciation on foreign currency forward contracts 20 (52)
Accretion of discount (940) (1,116)
Amortization of deferred financing costs 319 422
Acquisition of investments (47,222) (58,202)
Proceeds from principal payments and sales of portfolio investments 20,473 46,385
Proceeds from sales of portfolio investments to STRS JV 17,000 8,478
Net changes in operating assets and liabilities:    
Interest and dividend receivable 146 528
Prepaid expenses and other receivables 45 121
Amounts receivable on unsettled investment transactions (1,586) (7,217)
Amounts payable on unsettled investment transactions (3,539)  
Management fees payable (99) (479)
Incentive fees payable 129 2,703
Accounts payable and accrued expenses 320 (585)
Interest payable 1,770 1,790
Advances received from unfunded credit facilities 34 8
Net cash (used in) / provided by operating activities (7,005) 1,600
Cash flows from financing activities    
Borrowings 18,600 38,680
Repayments of debt (9,945) (34,900)
Deferred financing costs (945)  
Distributions paid to common stockholders, net of distributions reinvested (8,949) (8,949)
Net cash provided by / (used in) financing activities (1,239) (5,169)
Effect of exchange rate changes on cash 29 (17)
Net change in cash, cash equivalents and restricted cash (8,215) (3,586)
Cash, cash equivalents and restricted cash at beginning of period 27,836 24,487
Cash, cash equivalents and restricted cash at end of period 19,621 20,901
Supplemental and non-cash disclosure of cash flow information:    
Interest paid $ 4,097 $ 5,119
v3.25.1
Consolidated Statements of Cash Flows (Unaudited) - Total cash, cash equivalents and restricted cash - USD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of cash, cash equivalents    
Cash and cash equivalents $ 11,444 $ 10,723
Restricted cash and cash equivalents 7,882 8,863
Restricted foreign currency 295 1,315
Total cash and cash equivalents, restricted cash and cash equivalents and restricted foreign currency presented in consolidated statements of cash flows $ 19,621 $ 20,901
v3.25.1
Consolidated Schedule of Investments
$ in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Mar. 31, 2025
CAD ($)
shares
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
USD ($)
Schedule of Investments [Line Items]              
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Investments, amortized cost $ 706,224 $ 706,224 $ 706,224 $ 695,240      
Investments, fair value $ 650,999 $ 650,999 $ 650,999 $ 642,213      
Percent of net assets 231.30% 231.30% 231.30% 224.40% 231.30% 224.40%  
Total investments and money market funds amortized cost $ 720,546 $ 720,546 $ 720,546 $ 708,489      
Total investments and money market funds fair value $ 665,321 $ 665,321 $ 665,321 $ 655,462      
Total investments and money market funds percentage 236.40% 236.40% 236.40% 229.00% 236.40% 229.00%  
Qualifying assets required of acquiree at time of acquisition of total assets   70.00%   70.00%      
Qualifying assets of acquired of total assets   80.90%   80.70%      
Investments of net assets   231.30%   224.40%      
Investment Of total assets   95.90%   94.90%      
Unrealized appreciation       $ 20      
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%  
Interest Rate 9.32% 9.32% 9.32% 9.78% 9.32% 9.78%  
Acquisition Date   Sep. 19, 2024   Sep. 19, 2024      
Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031  
Principal/Share Amount $ 348 $ 348 $ 348 $ 78      
Investments, amortized cost 345 345 345 78      
Investments, fair value $ 358 $ 358 $ 358 $ 80      
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%  
Interest Rate 9.32% 9.32% 9.32% 9.78% 9.32% 9.78%  
Acquisition Date   Sep. 19, 2024   Sep. 19, 2024      
Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031  
Investments, fair value $ 8 $ 8 $ 8 $ 5      
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%  
Interest Rate 9.32% 9.32% 9.32% 9.79% 9.32% 9.79%  
Acquisition Date   Sep. 19, 2024   Sep. 19, 2024      
Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031  
Principal/Share Amount $ 7,946 $ 7,946 $ 7,946 $ 7,962      
Investments, amortized cost 7,854 7,854 7,854 7,866      
Investments, fair value $ 7,964 $ 7,964 $ 7,964 $ 7,919      
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ABBCon-ciseOpticalGroupLLCMember   whfcl:ABBCon-ciseOpticalGroupLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Interest Rate 11.95% 11.95% 11.95% 11.98% 11.95% 11.98%  
Acquisition Date   Feb. 23, 2022   Feb. 23, 2022      
Maturity Date Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028  
Principal/Share Amount $ 20,409 $ 20,409 $ 20,409 $ 20,409      
Investments, amortized cost 20,163 20,163 20,163 20,142      
Investments, fair value $ 19,163 $ 19,163 $ 19,163 $ 19,535      
Percent of net assets 6.80% 6.80% 6.80% 6.80% 6.80% 6.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.06% 10.06% 10.06% 10.40% 10.06% 10.40%  
Acquisition Date   Apr. 26, 2024   Apr. 26, 2024      
Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030  
Investments, fair value $ 14 $ 14 $ 14 $ 15      
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.06% 10.06% 10.06% 10.40% 10.06% 10.40%  
Acquisition Date   Apr. 26, 2024   Apr. 26, 2024      
Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030  
Investments, fair value $ 5 $ 5 $ 5 $ 6      
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.06% 10.06% 10.06% 10.40% 10.06% 10.40%  
Acquisition Date   Apr. 26, 2024   Apr. 26, 2024      
Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030  
Principal/Share Amount $ 4,080 $ 4,080 $ 4,080 $ 4,080      
Investments, amortized cost 4,028 4,028 4,028 4,027      
Investments, fair value $ 4,070 $ 4,070 $ 4,070 $ 4,070      
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Interest Rate 11.94% 11.94% 11.94% 11.96% 11.94% 11.96%  
Cash interest rate 5.44% 5.44% 5.44% 5.46% 5.44% 5.46%  
PIK interest rate 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Acquisition Date   Mar. 20, 2024   Mar. 20, 2024      
Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028  
Principal/Share Amount $ 1,810 $ 1,810 $ 1,810 $ 1,782      
Investments, amortized cost 1,656 1,656 1,656 1,615      
Investments, fair value $ 1,479 $ 1,479 $ 1,479 $ 1,456      
Percent of net assets 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Four              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Interest Rate 11.44% 11.44% 11.44% 11.46% 11.44% 11.46%  
Acquisition Date   Mar. 20, 2024   Mar. 20, 2024      
Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028  
Principal/Share Amount $ 2,400 $ 2,400 $ 2,400 $ 2,400      
Investments, amortized cost 2,262 2,262 2,262 2,330      
Investments, fair value $ 53 $ 53 $ 53 $ 74      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Three              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Interest Rate 11.44% 11.44% 11.44% 11.46% 11.44% 11.46%  
Acquisition Date   Mar. 20, 2024   Mar. 20, 2024      
Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028  
Principal/Share Amount $ 9,600 $ 9,600 $ 9,600 $ 9,600      
Investments, amortized cost 9,050 9,050 9,050 9,318      
Investments, fair value $ 3,637 $ 3,637 $ 3,637 $ 3,990      
Percent of net assets 1.30% 1.30% 1.30% 1.40% 1.30% 1.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Two              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Interest Rate 11.94% 11.94% 11.94% 11.96% 11.94% 11.96%  
Cash interest rate 6.44% 6.44% 6.44% 6.46% 6.44% 6.46%  
PIK interest rate 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Acquisition Date   Mar. 20, 2024   Mar. 20, 2024      
Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028  
Principal/Share Amount $ 1,194 $ 1,194 $ 1,194 $ 1,178      
Investments, amortized cost 1,011 1,011 1,011 1,029      
Investments, fair value $ 418 $ 418 $ 418 $ 451      
Percent of net assets 0.10% 0.10% 0.10% 0.20% 0.10% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: American Crafts Holdings, LLC, Warrants              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsHoldingsLlcMember   whfcl:AmericanCraftsHoldingsLlcMember      
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Acquisition Date   Dec. 22, 2022   Dec. 22, 2022      
Maturity Date Dec. 22, 2032 Dec. 22, 2032 Dec. 22, 2032   Dec. 22, 2032    
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: American Crafts Lc Super Priority First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember      
Investment, Type [Extensible Enumeration] whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
PIK interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
Acquisition Date   Jul. 25, 2023   Jul. 25, 2023      
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Principal/Share Amount $ 2,263 $ 2,263 $ 2,263 $ 2,191      
Investments, amortized cost $ 2,094 $ 2,094 $ 2,094 $ 2,094      
Investments, fair value             $ 1,878
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
PIK interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
Acquisition Date   Jan. 25, 2022   Jan. 25, 2022      
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Principal/Share Amount $ 1,883 $ 1,883 $ 1,883 $ 1,823      
Investments, amortized cost $ 1,458 $ 1,458 $ 1,458 $ 1,458      
Investments, fair value             93
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
PIK interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
Acquisition Date   May 28, 2021   May 28, 2021      
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Principal/Share Amount $ 11,213 $ 11,213 $ 11,213 $ 10,859      
Investments, amortized cost $ 8,720 $ 8,720 $ 8,720 $ 8,720      
Investments, fair value             553
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: American Crafts, LC Priority First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember      
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Interest Rate       12.96%   12.96%  
PIK interest rate 12.92% 12.92% 12.92%   12.92%    
Acquisition Date   Dec. 22, 2022   Dec. 22, 2022      
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Principal/Share Amount $ 6,068 $ 6,068 $ 6,068 $ 5,876      
Investments, amortized cost $ 5,105 $ 5,105 $ 5,105 $ 5,105      
Investments, fair value             3,226
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember      
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
PIK interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
Acquisition Date   May 02, 2024   May 02, 2024      
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Principal/Share Amount $ 2,566 $ 2,566 $ 2,566 $ 2,485      
Investments, amortized cost $ 2,374 $ 2,374 $ 2,374 2,374      
Investments, fair value       $ 373      
Percent of net assets       0.10%   0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan one              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember      
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
PIK interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
Acquisition Date   Jan. 31, 2024   Jan. 31, 2024      
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Principal/Share Amount $ 1,329 $ 1,329 $ 1,329 $ 1,287      
Investments, amortized cost $ 1,230 $ 1,230 $ 1,230 $ 1,230      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) Common Units One              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanGpLlcMember   whfcl:ArcserveCaymanGpLlcMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Acquisition Date   Jan. 03, 2024   Jan. 03, 2024      
Investment owned shares | shares 663,000 663,000 663,000 663 663,000 663  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
PIK interest rate 12.44% 12.44% 12.44% 12.67% 12.44% 12.67%  
Acquisition Date   Jan. 03, 2024   Jan. 03, 2024      
Maturity Date Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027  
Principal/Share Amount $ 711 $ 711 $ 711 $ 689      
Investments, amortized cost 700 700 700 677      
Investments, fair value $ 1,244 $ 1,244 $ 1,244 $ 1,247      
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember      
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Spread Above Index 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
PIK interest rate       9.00%   9.00%  
PIK interest rate 9.00% 9.00% 9.00%   9.00%    
Acquisition Date   Jan. 03, 2024   Jan. 03, 2024      
Maturity Date Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029  
Principal/Share Amount $ 594 $ 594 $ 594 $ 581      
Investments, amortized cost 583 583 583 569      
Investments, fair value $ 594 $ 594 $ 594 $ 581      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan Two              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember      
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Spread Above Index 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
PIK interest rate       9.00%   9.00%  
PIK interest rate 9.00% 9.00% 9.00%   9.00%    
Acquisition Date   Jan. 03, 2024   Jan. 03, 2024      
Maturity Date Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029  
Principal/Share Amount $ 608 $ 608 $ 608 $ 594      
Investments, amortized cost 597 597 597 583      
Investments, fair value $ 608 $ 608 $ 608 $ 594      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units Two              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanTopcoLpMember   whfcl:ArcserveCaymanTopcoLpMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Acquisition Date   Jan. 03, 2024   Jan. 03, 2024      
Investment owned shares | shares 663,000 663,000 663,000 663 663,000 663  
Investments, amortized cost $ 19,568 $ 19,568 $ 19,568 $ 19,568      
Investments, fair value $ 9,121 $ 9,121 $ 9,121 $ 9,131      
Percent of net assets 3.20% 3.20% 3.20% 3.20% 3.20% 3.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArteriocyteMedicalSystemsInc.Member   whfcl:ArteriocyteMedicalSystemsInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 4.75% 4.75% 5.00% 4.75% 5.00%  
Interest Rate 9.05% 9.05% 9.05% 9.33% 9.05% 9.33%  
Acquisition Date   Oct. 25, 2023   Oct. 25, 2023      
Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028  
Investments, fair value $ 9 $ 9 $ 9 $ 9      
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArteriocyteMedicalSystemsInc.Member   whfcl:ArteriocyteMedicalSystemsInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 4.75% 4.75% 4.75% 5.00% 4.75% 5.00%  
Interest Rate 9.05% 9.05% 9.05% 9.33% 9.05% 9.33%  
Acquisition Date   Oct. 25, 2023   Oct. 25, 2023      
Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028  
Principal/Share Amount $ 4,959 $ 4,959 $ 4,959 $ 4,972      
Investments, amortized cost 4,871 4,871 4,871 4,877      
Investments, fair value $ 4,963 $ 4,963 $ 4,963 $ 5,021      
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Avision Holdings, LLC [Member]   Avision Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.45% 10.45% 10.45% 10.48% 10.45% 10.48%  
Acquisition Date   May 31, 2024   May 31, 2024      
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Principal/Share Amount $ 552 $ 552 $ 552 $ 553      
Investments, amortized cost 544 544 544 545      
Investments, fair value $ 560 $ 560 $ 560 $ 558      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Avision Holdings, LLC [Member]   Avision Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.45% 10.45% 10.45% 10.48% 10.45% 10.48%  
Acquisition Date   May 31, 2024   May 31, 2024      
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Principal/Share Amount $ 657 $ 657 $ 657 $ 658      
Investments, amortized cost 648 648 648 648      
Investments, fair value $ 652 $ 652 $ 652 $ 652      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Avision Holdings, LLC [Member]   Avision Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Acquisition Date   Dec. 15, 2021   Dec. 15, 2021      
Investment owned shares | shares 200,000 200,000 200,000 200 200,000 200  
Investments, amortized cost $ 287 $ 287 $ 287 $ 287      
Investments, fair value $ 547 $ 547 $ 547 $ 577      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%  
Interest Rate 14.92% 14.92% 14.92% 14.96% 14.92% 14.96%  
Cash interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
PIK interest rate 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Acquisition Date   Dec. 02, 2021   Dec. 02, 2021      
Maturity Date Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025  
Principal/Share Amount $ 2,660 $ 2,660 $ 2,660 $ 2,654      
Investments, amortized cost 2,655 2,655 2,655 2,645      
Investments, fair value $ 2,648 $ 2,648 $ 2,648 $ 2,642      
Percent of net assets 0.90% 0.90% 0.90% 0.90% 0.90% 0.90%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%  
Interest Rate 14.92% 14.92% 14.92% 14.96% 14.92% 14.96%  
Cash interest rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
PIK interest rate 2.00% 2.00% 2.00%   2.00%    
Acquisition Date   Aug. 28, 2020   Aug. 28, 2020      
Maturity Date Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025  
Principal/Share Amount $ 13,046 $ 13,046 $ 13,046 $ 13,013      
Investments, amortized cost 13,021 13,021 13,021 12,972      
Investments, fair value $ 12,988 $ 12,988 $ 12,988 $ 12,955      
Percent of net assets 4.60% 4.60% 4.60% 4.50% 4.60% 4.50%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember      
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances  
Acquisition Date   Aug. 28, 2020   Aug. 28, 2020      
Investment owned shares | shares 1,100,000 1,100,000 1,100,000 1,100 1,100,000 1,100  
Investments, amortized cost $ 1,100 $ 1,100 $ 1,100 $ 1,100      
Investments, fair value $ 970 $ 970 $ 970 $ 907      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: BL Products Parent, LP (d/b/a Bishop Lifting Products, Inc.) Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:BLProductsParentLPMember      
Investment, Type [Extensible Enumeration]       whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
Acquisition Date       Feb. 01, 2022      
Investment owned shares | shares       733   733  
Investments, amortized cost       $ 788      
Investments, fair value       $ 1,012      
Percent of net assets       0.40%   0.40%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       true   true  
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:BLProductsParentLPMember          
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components    
Acquisition Date   Feb. 01, 2022          
Investment owned shares | shares 733,000 733,000 733,000   733,000    
Investments, amortized cost $ 788 $ 788 $ 788        
Investments, fair value $ 1,012 $ 1,012 $ 1,012        
Percent of net assets 0.40% 0.40% 0.40%   0.40%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: BPII-JL Group Holdings LP (d/b/a Juniper Landscaping Holdings LLC) Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:BPII-JLGroupHoldingsLPMember      
Investment, Type [Extensible Enumeration]       whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Environmental & Facilities Services   Environmental & Facilities Services  
Acquisition Date       Dec. 29, 2021      
Investment owned shares | shares       90   90  
Investments, amortized cost       $ 942      
Investments, fair value       $ 1,400      
Percent of net assets       0.50%   0.50%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       true   true  
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:BPII-JLGroupHoldingsLPMember          
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services   Environmental & Facilities Services    
Acquisition Date   Dec. 29, 2021          
Investment owned shares | shares 90,000 90,000 90,000   90,000    
Investments, amortized cost $ 942 $ 942 $ 942        
Investments, fair value $ 1,434 $ 1,434 $ 1,434        
Percent of net assets 0.50% 0.50% 0.50%   0.50%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.69% 10.69% 10.69% 10.81% 10.69% 10.81%  
Acquisition Date   Apr. 04, 2024   Apr. 04, 2024      
Maturity Date Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029  
Principal/Share Amount $ 276 $ 276 $ 276 $ 459      
Investments, amortized cost 269 269 269 447      
Investments, fair value $ 281 $ 281 $ 281 $ 461      
Percent of net assets 0.10% 0.10% 0.10% 0.20% 0.10% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.77% 10.77% 10.77% 10.77% 10.77% 10.77%  
Acquisition Date   Apr. 04, 2024   Apr. 04, 2024      
Maturity Date Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029  
Principal/Share Amount $ 7,678 $ 7,678 $ 7,678 $ 7,779      
Investments, amortized cost 7,493 7,493 7,493 7,580      
Investments, fair value $ 7,596 $ 7,596 $ 7,596 $ 7,691      
Percent of net assets 2.70% 2.70% 2.70% 2.70% 2.70% 2.70%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.57% 10.57% 10.57% 10.59% 10.57% 10.59%  
Acquisition Date   Dec. 21, 2023   Dec. 21, 2023      
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Principal/Share Amount $ 1,909 $ 1,909 $ 1,909 $ 1,502      
Investments, amortized cost 1,874 1,874 1,874 1,472      
Investments, fair value $ 1,863 $ 1,863 $ 1,863 $ 1,477      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.57% 10.57% 10.57% 10.61% 10.57% 10.61%  
Acquisition Date   Dec. 21, 2023   Dec. 21, 2023      
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Principal/Share Amount       $ 420      
Investments, amortized cost       412      
Investments, fair value $ (6) $ (6) $ (6) $ 415      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.57% 10.57% 10.57% 10.61% 10.57% 10.61%  
Acquisition Date   Dec. 21, 2023   Dec. 21, 2023      
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Principal/Share Amount $ 3,014 $ 3,014 $ 3,014 $ 3,033      
Investments, amortized cost 2,958 2,958 2,958 2,974      
Investments, fair value $ 2,941 $ 2,941 $ 2,941 $ 2,981      
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.31% 10.31% 10.31% 10.51% 10.31% 10.51%  
Acquisition Date   Jan. 10, 2024   Jan. 10, 2024      
Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029  
Investments, fair value $ (2) $ (2) $ (2) $ (2)      
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Interest Rate 12.50% 12.50% 12.50% 12.50% 12.50% 12.50%  
Acquisition Date   Jan. 10, 2024   Jan. 10, 2024      
Maturity Date Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028  
Principal/Share Amount $ 142 $ 142 $ 142 $ 60      
Investments, amortized cost 139 139 139 58      
Investments, fair value $ 143 $ 143 $ 143 $ 63      
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.31% 10.31% 10.31% 10.51% 10.31% 10.51%  
Acquisition Date   Jan. 10, 2024   Jan. 10, 2024      
Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029  
Principal/Share Amount $ 3,608 $ 3,608 $ 3,608 $ 3,617      
Investments, amortized cost 3,538 3,538 3,538 3,543      
Investments, fair value $ 3,566 $ 3,566 $ 3,566 $ 3,574      
Investment, Identifier [Axis]: Basel U.S. Acquisition Co., Inc. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BaselU.s.AcquisitionCo.Inc.Member   whfcl:BaselU.s.AcquisitionCo.Inc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%  
Interest Rate 9.55% 9.55% 9.55% 9.94% 9.55% 9.94%  
Acquisition Date   Sep. 13, 2024   Sep. 13, 2024      
Maturity Date Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028  
Investments, fair value $ 16 $ 16 $ 16 $ 7      
Investment, Identifier [Axis]: Basel U.S. Acquisition Co., Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BaselU.s.AcquisitionCo.Inc.Member   whfcl:BaselU.s.AcquisitionCo.Inc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member] Aerospace Sector [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%  
Interest Rate 9.55% 9.55% 9.55% 9.94% 9.55% 9.94%  
Acquisition Date   Sep. 13, 2024   Sep. 13, 2024      
Maturity Date Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028  
Principal/Share Amount $ 3,672 $ 3,672 $ 3,672 $ 3,681      
Investments, amortized cost 3,626 3,626 3,626 3,633      
Investments, fair value $ 3,694 $ 3,694 $ 3,694 $ 3,675      
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:BridgepointHealthcareLLCMember   whfcl:BridgepointHealthcareLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%  
Acquisition Date   Oct. 05, 2021   Oct. 05, 2021      
Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026  
Principal/Share Amount $ 238 $ 238 $ 238 $ 238      
Investments, amortized cost 237 237 237 237      
Investments, fair value $ 238 $ 238 $ 238 $ 231      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:BridgepointHealthcareLLCMember   whfcl:BridgepointHealthcareLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%  
Acquisition Date   Oct. 05, 2021   Oct. 05, 2021      
Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026  
Principal/Share Amount $ 8,378 $ 8,378 $ 8,378 $ 8,517      
Investments, amortized cost 8,327 8,327 8,327 8,457      
Investments, fair value $ 8,335 $ 8,335 $ 8,335 $ 8,429      
Percent of net assets 3.00% 3.00% 3.00% 2.90% 3.00% 2.90%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 5.00% 6.50% 5.00%  
Interest Rate 10.92% 10.92% 10.92% 8.45% 10.92% 8.45%  
Acquisition Date   Aug. 09, 2023   Aug. 09, 2023      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Principal/Share Amount $ 2,163 $ 2,163 $ 2,163 $ 2,168      
Investments, amortized cost 2,117 2,117 2,117 2,120      
Investments, fair value $ 2,174 $ 2,174 $ 2,174 $ 2,183      
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Aug. 09, 2023   Aug. 09, 2023      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Principal/Share Amount $ 234 $ 234 $ 234 $ 234      
Investments, amortized cost 230 230 230 230      
Investments, fair value $ 247 $ 247 $ 247 $ 248      
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.42% 6.42% 6.42% 6.42% 6.42% 6.42%  
Interest Rate 10.84% 10.84% 10.84% 10.88% 10.84% 10.88%  
Acquisition Date   Aug. 09, 2023   Aug. 09, 2023      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Principal/Share Amount $ 6,886 $ 6,886 $ 6,886 $ 6,904      
Investments, amortized cost 6,764 6,764 6,764 6,774      
Investments, fair value $ 6,877 $ 6,877 $ 6,877 $ 6,952      
Investment, Identifier [Axis]: CX Holdco LLC Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:CXHoldcoLLCMember   whfcl:CXHoldcoLLCMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Acquisition Date   May 04, 2021   May 04, 2021      
Investment owned shares | shares 1,068,000 1,068,000 1,068,000 1,068,000 1,068,000 1,068,000  
Investments, amortized cost $ 1,116 $ 1,116 $ 1,116 $ 1,116      
Investments, fair value $ 1,883 $ 1,883 $ 1,883 $ 2,232      
Percent of net assets 0.70% 0.70% 0.70% 0.80% 0.70% 0.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Camarillo Fitness Holdings, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities   Leisure Facilities    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 4.50% 4.50% 4.50%   4.50%    
Spread Above Index 8.50% 8.50% 8.50%   8.50%    
PIK interest rate 13.03% 13.03% 13.03%   13.03%    
Acquisition Date   Jan. 15, 2025          
Maturity Date Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029   Sep. 25, 2029    
Principal/Share Amount $ 811 $ 811 $ 811        
Investments, amortized cost 811 811 811        
Investments, fair value $ 717 $ 717 $ 717        
Percent of net assets 0.30% 0.30% 0.30%   0.30%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Camarillo Fitness Holdings, LLC [Member]   Camarillo Fitness Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
PIK interest rate 12.95% 12.95% 12.95% 12.98% 12.95% 12.98%  
Acquisition Date   Sep. 25, 2024   Sep. 25, 2024      
Maturity Date Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029  
Principal/Share Amount $ 12,140 $ 12,140 $ 12,140 $ 11,738      
Investments, amortized cost 10,231 10,231 10,231 10,269      
Investments, fair value $ 10,742 $ 10,742 $ 10,742 $ 10,492      
Percent of net assets 3.80% 3.80% 3.80% 3.70% 3.80% 3.70%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:CampFacilityServicesHoldingsLLCMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Real Estate Services [Member]   Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       1.00%   1.00%  
Spread Above Index       6.50%   6.50%  
Interest Rate       10.96%   10.96%  
Acquisition Date       Nov. 16, 2021      
Maturity Date       Nov. 16, 2027   Nov. 16, 2027  
Principal/Share Amount       $ 10,424      
Investments, amortized cost       10,325      
Investments, fair value       $ 9,905      
Percent of net assets       3.50%   3.50%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:CampFacilityServicesHoldingsLLCMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]   Real Estate Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 6.50% 6.50% 6.50%   6.50%    
Interest Rate 10.92% 10.92% 10.92%   10.92%    
Acquisition Date   Nov. 16, 2021          
Maturity Date Nov. 16, 2027 Nov. 16, 2027 Nov. 16, 2027   Nov. 16, 2027    
Principal/Share Amount $ 10,392 $ 10,392 $ 10,392        
Investments, amortized cost 10,301 10,301 10,301        
Investments, fair value $ 9,773 $ 9,773 $ 9,773        
Percent of net assets 3.50% 3.50% 3.50%   3.50%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:CampFacilityServicesParentLLCMember   whfcl:CampFacilityServicesParentLLCMember      
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services [Member] Real Estate Services Real Estate Services [Member]  
Spread Above Index 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
PIK interest rate 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%  
Acquisition Date   Nov. 16, 2021   Nov. 16, 2021      
Investment owned shares | shares 15,000 15,000 15,000 15 15,000 15  
Investments, amortized cost $ 840 $ 840 $ 840 $ 840      
Investments, fair value $ 92 $ 92 $ 92 $ 162      
Percent of net assets       0.10%   0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] true true true true true true  
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember   whfcl:CennoxHoldingsLimitedMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%  
Interest Rate 10.32% 10.32% 10.32% 10.40% 10.32% 10.40%  
Cash interest rate 10.07% 10.07% 10.07%   10.07%    
PIK interest rate 0.25% 0.25% 0.25%   0.25%    
Acquisition Date   Sep. 11, 2024   Sep. 11, 2024      
Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029  
Investments, fair value $ 2 $ 2 $ 2 $ 2      
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember   whfcl:CennoxHoldingsLimitedMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%  
Interest Rate 10.32% 10.32% 10.32% 10.40% 10.32% 10.40%  
Cash interest rate 10.07% 10.07% 10.07%   10.07%    
PIK interest rate 0.25% 0.25% 0.25%   0.25%    
Acquisition Date   Sep. 11, 2024   Sep. 11, 2024      
Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029  
Principal/Share Amount $ 512 $ 512 $ 512 $ 513      
Investments, amortized cost 664 664 664 665      
Investments, fair value $ 664 $ 664 $ 664 $ 643      
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member   whfcl:CennoxInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%  
Interest Rate 10.12% 10.12% 10.12% 10.25% 10.12% 10.25%  
Cash interest rate 9.87% 9.87% 9.87%   9.87%    
PIK interest rate 0.25% 0.25% 0.25%   0.25%    
Acquisition Date   Sep. 11, 2024   Sep. 11, 2024      
Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029  
Principal/Share Amount $ 97 $ 97 $ 97 $ 29      
Investments, amortized cost 96 96 96 29      
Investments, fair value $ 97 $ 97 $ 97 $ 30      
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member   whfcl:CennoxInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 5.75% 6.00% 5.75%  
Interest Rate 8.39% 8.39% 8.39% 9.14% 8.39% 9.14%  
Cash interest rate 8.14% 8.14% 8.14%   8.14%    
PIK interest rate 0.25% 0.25% 0.25%   0.25%    
Acquisition Date   Sep. 11, 2024   Sep. 11, 2024      
Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029  
Principal/Share Amount $ 593 $ 593 $ 593 $ 594      
Investments, amortized cost 648 648 648 649      
Investments, fair value $ 636 $ 636 $ 636 $ 611      
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member   whfcl:CennoxInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%  
Interest Rate 10.10% 10.10% 10.10% 10.34% 10.10% 10.34%  
Cash interest rate 9.85% 9.85% 9.85%   9.85%    
PIK interest rate 0.25% 0.25% 0.25%   0.25%    
Acquisition Date   Sep. 11, 2024   Sep. 11, 2024      
Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029  
Principal/Share Amount $ 3,341 $ 3,341 $ 3,341 $ 3,350      
Investments, amortized cost 3,312 3,312 3,312 3,319      
Investments, fair value $ 3,341 $ 3,341 $ 3,341 $ 3,344      
Investment, Identifier [Axis]: Chase Products Co. (f/k/a Starco) Second Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ChaseProductsCoMember   whfcl:ChaseProductsCoMember      
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals  
Spread Above Index 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%  
PIK interest rate 12.00% 12.00% 12.00%   12.00%    
PIK interest rate       12.00%   12.00%  
Acquisition Date   Mar. 16, 2023   Mar. 16, 2023      
Maturity Date Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028  
Principal/Share Amount $ 3,442 $ 3,442 $ 3,442 $ 3,342      
Investments, amortized cost 3,442 3,442 3,442 3,342      
Investments, fair value $ 3,442 $ 3,442 $ 3,442 $ 3,342     2,793
Percent of net assets 1.20% 1.20% 1.20% 1.20% 1.20% 1.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ClaridgeProductsandEquipmentLLCMember   whfcl:ClaridgeProductsandEquipmentLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction Materials Construction Materials Construction Materials Construction Materials Construction Materials Construction Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.31% 8.31% 8.31% 8.31% 8.31% 8.31%  
Interest Rate 14.10% 14.10% 14.10% 14.13% 14.10% 14.13%  
Cash interest rate 11.85% 11.85% 11.85% 11.88% 11.85% 11.88%  
PIK interest rate 2.25% 2.25% 2.25% 2.25% 2.25% 2.25%  
Acquisition Date   Dec. 30, 2020   Dec. 30, 2020      
Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025  
Principal/Share Amount $ 632 $ 632 $ 632 $ 632      
Investments, amortized cost 630 630 630 630      
Investments, fair value $ 554 $ 554 $ 554 $ 555      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ClaridgeProductsandEquipmentLLCMember   whfcl:ClaridgeProductsandEquipmentLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction Materials Construction Materials Construction Materials Construction Materials Construction Materials Construction Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.75% 8.75% 8.75% 8.75% 8.75% 8.75%  
Interest Rate 13.17% 13.17% 13.17% 13.21% 13.17% 13.21%  
Cash interest rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
PIK interest rate 2.25% 2.25% 2.25% 2.25% 2.25% 2.25%  
Acquisition Date   Dec. 30, 2020   Dec. 30, 2020      
Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025  
Principal/Share Amount $ 5,747 $ 5,747 $ 5,747 $ 5,711      
Investments, amortized cost 5,731 5,731 5,731 5,690      
Investments, fair value $ 5,114 $ 5,114 $ 5,114 $ 5,085      
Percent of net assets 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Clark Restaurant Service, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ClarkRestaurantServiceLlcMember   whfcl:ClarkRestaurantServiceLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.07% 10.07% 10.07% 10.11% 10.07% 10.11%  
Acquisition Date   Jun. 14, 2024   Jun. 14, 2024      
Maturity Date May 10, 2029 May 10, 2029 May 10, 2029 May 10, 2029 May 10, 2029 May 10, 2029  
Principal/Share Amount $ 4,994 $ 4,994 $ 4,994 $ 5,006      
Investments, amortized cost 4,911 4,911 4,911 4,919      
Investments, fair value $ 4,981 $ 4,981 $ 4,981 $ 4,993      
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:CleanChoiceEnergyIncMember   whfcl:CleanChoiceEnergyIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electric Utilities Electric Utilities Electric Utilities Electric Utilities Electric Utilities Electric Utilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.59% 7.59% 7.59% 7.59% 7.59% 7.59%  
Interest Rate 12.04% 12.04% 12.04% 12.39% 12.04% 12.39%  
Acquisition Date   Oct. 12, 2021   Oct. 12, 2021      
Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026  
Principal/Share Amount $ 15,955 $ 15,955 $ 15,955 $ 15,955      
Investments, amortized cost 15,823 15,823 15,823 15,802      
Investments, fair value $ 16,042 $ 16,042 $ 16,042 $ 16,032      
Percent of net assets 5.70% 5.70% 5.70% 5.60% 5.70% 5.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:CoastalTelevisionBroadcastingGroupLLCMember   whfcl:CoastalTelevisionBroadcastingGroupLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadcasting Broadcasting Broadcasting Broadcasting Broadcasting Broadcasting  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Dec. 30, 2021   Dec. 30, 2021      
Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026  
Investments, fair value $ 1 $ 1 $ 1 $ 1      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:CoastalTelevisionBroadcastingGroupLLCMember   whfcl:CoastalTelevisionBroadcastingGroupLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadcasting Broadcasting Broadcasting Broadcasting Broadcasting Broadcasting  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Dec. 30, 2021   Dec. 30, 2021      
Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026  
Principal/Share Amount $ 7,546 $ 7,546 $ 7,546 $ 7,879      
Investments, amortized cost 7,486 7,486 7,486 7,808      
Investments, fair value $ 7,515 $ 7,515 $ 7,515 $ 7,832      
Percent of net assets 2.70% 2.70% 2.70% 2.70% 2.70% 2.70%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:DrewFoamCompaniesIncMember   whfcl:DrewFoamCompaniesIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.45% 10.45% 10.45% 10.48% 10.45% 10.48%  
Acquisition Date   Nov. 09, 2020   Nov. 09, 2020      
Maturity Date Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026  
Principal/Share Amount $ 13,465 $ 13,465 $ 13,465 $ 13,501      
Investments, amortized cost 13,416 13,416 13,416 13,445      
Investments, fair value $ 13,372 $ 13,372 $ 13,372 $ 13,437      
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:E-PhoenixAcquisitionCo.Inc.Member   whfcl:E-PhoenixAcquisitionCo.Inc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 9.95% 9.95% 9.95% 9.98% 9.95% 9.98%  
Acquisition Date   Jul. 15, 2021   Jul. 15, 2021      
Maturity Date Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027  
Principal/Share Amount $ 8,320 $ 8,320 $ 8,320 $ 8,342      
Investments, amortized cost 8,281 8,281 8,281 8,299      
Investments, fair value $ 8,320 $ 8,320 $ 8,320 $ 8,342      
Investment, Identifier [Axis]: ELM One Call Locators, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:ElmOneCallLocatorsInc.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 6.25% 6.25% 6.25%   6.25%    
Interest Rate 10.58% 10.58% 10.58%   10.58%    
Acquisition Date   Feb. 12, 2025          
Maturity Date Feb. 12, 2030 Feb. 12, 2030 Feb. 12, 2030   Feb. 12, 2030    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: ELM One Call Locators, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:ElmOneCallLocatorsInc.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 6.25% 6.25% 6.25%   6.25%    
Interest Rate 10.58% 10.58% 10.58%   10.58%    
Acquisition Date   Feb. 12, 2025          
Maturity Date Feb. 12, 2030 Feb. 12, 2030 Feb. 12, 2030   Feb. 12, 2030    
Principal/Share Amount $ 7,650 $ 7,650 $ 7,650        
Investments, amortized cost 7,501 7,501 7,501        
Investments, fair value $ 7,501 $ 7,501 $ 7,501        
Percent of net assets 2.70% 2.70% 2.70%   2.70%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Eddy Acquisitions, LLC (d/b/a EducationDynamics, LLC) Preferred Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:EddyAcquisitionsLLCMember      
Investment, Type [Extensible Enumeration]       whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Education Services   Education Services  
Spread Above Index       12.00%   12.00%  
Interest Rate       12.00%   12.00%  
Acquisition Date       Sep. 15, 2021      
Investment owned shares | shares       167   167  
Investments, amortized cost       $ 167      
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       true   true  
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:EddyAcquisitionsLLCMember          
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services Education Services Education Services   Education Services    
Spread Above Index 12.00% 12.00% 12.00%   12.00%    
Interest Rate 12.00% 12.00% 12.00%   12.00%    
Acquisition Date   Sep. 15, 2021          
Investment owned shares | shares 167,000 167,000 167,000   167,000    
Investments, amortized cost $ 167 $ 167 $ 167        
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] true true true   true    
Investment, Identifier [Axis]: Education Dynamics, LLC Senior Preferred Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services Education Services Education Services Education Services Education Services Education Services  
Acquisition Date   Sep. 15, 2021   Sep. 15, 2021      
Investment owned shares | shares 167,000 167,000 167,000 167 167,000 167  
Investments, amortized cost $ 167 $ 167 $ 167 $ 167      
Investments, fair value $ 127 $ 127 $ 127 $ 100      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services Education Services Education Services Education Services Education Services Education Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.93% 10.93% 10.93% 10.96% 10.93% 10.96%  
Acquisition Date   Sep. 15, 2021   Sep. 15, 2021      
Maturity Date Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027  
Investments, fair value $ (46) $ (46) $ (46) $ (51)      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services Education Services Education Services Education Services Education Services Education Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.93% 10.93% 10.93% 10.96% 10.93% 10.96%  
Acquisition Date   Sep. 15, 2021   Sep. 15, 2021      
Maturity Date Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027  
Principal/Share Amount $ 13,001 $ 13,001 $ 13,001 $ 13,089      
Investments, amortized cost 12,912 12,912 12,912 12,989      
Investments, fair value $ 12,428 $ 12,428 $ 12,428 $ 12,449      
Percent of net assets 4.40% 4.40% 4.40% 4.30% 4.40% 4.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Event Services America, Inc. (d/b/a Contemporary Services Corporation) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:EventServicesAmericaIncMember   whfcl:EventServicesAmericaIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Security & Alarm Services Security & Alarm Services Security & Alarm Services Security & Alarm Services Security & Alarm Services Security & Alarm Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.07% 11.07% 11.07% 11.11% 11.07% 11.11%  
Acquisition Date   Jan. 31, 2024   Jan. 31, 2024      
Maturity Date Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029  
Principal/Share Amount $ 6,983 $ 6,983 $ 6,983 $ 7,000      
Investments, amortized cost 6,849 6,849 6,849 6,857      
Investments, fair value $ 7,052 $ 7,052 $ 7,052 $ 7,070      
Percent of net assets 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: FGI Acquisition Corp. (d/b/a Flexitallic Group SAS) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:FgiAcquisitionCorpMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Commodity Chemicals Commodity Chemicals Commodity Chemicals   Commodity Chemicals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 6.50% 6.50% 6.50%   6.50%    
Interest Rate 10.95% 10.95% 10.95%   10.95%    
Acquisition Date   Oct. 28, 2019          
Maturity Date Oct. 29, 2026 Oct. 29, 2026 Oct. 29, 2026   Oct. 29, 2026    
Principal/Share Amount $ 15,985 $ 15,985 $ 15,985        
Investments, amortized cost 15,759 15,759 15,759        
Investments, fair value $ 15,985 $ 15,985 $ 15,985        
Percent of net assets 5.70% 5.70% 5.70%   5.70%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: FGI Acquisition Corp. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:FgiAcquisitionCorpMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Commodity Chemicals   Commodity Chemicals  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       1.00%   1.00%  
Spread Above Index       6.50%   6.50%  
Interest Rate       10.98%   10.98%  
Acquisition Date       Oct. 28, 2019      
Maturity Date       Oct. 29, 2026   Oct. 29, 2026  
Principal/Share Amount       $ 16,026      
Investments, amortized cost       15,765      
Investments, fair value       $ 16,026      
Percent of net assets       5.60%   5.60%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:FloworksInternationalLlcMember   whfcl:FloworksInternationalLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 4.75% 4.75% 4.75% 5.75% 4.75% 5.75%  
Interest Rate 9.07% 9.07% 9.07% 10.40% 9.07% 10.40%  
Acquisition Date   Dec. 12, 2024   Dec. 12, 2024      
Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031  
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:FloworksInternationalLlcMember   whfcl:FloworksInternationalLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%  
Interest Rate 9.07% 9.07% 9.07% 9.27% 9.07% 9.27%  
Acquisition Date   Dec. 12, 2024   Dec. 12, 2024      
Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031  
Principal/Share Amount $ 5,333 $ 5,333 $ 5,333 $ 5,333      
Investments, amortized cost 5,282 5,282 5,282 5,280      
Investments, fair value $ 5,279 $ 5,279 $ 5,279 $ 5,281      
Investment, Identifier [Axis]: Foodservices Brand Group, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:FoodservicesBrandGroupLlcMember   whfcl:FoodservicesBrandGroupLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.62% 12.62% 12.62% 12.62% 12.62% 12.62%  
Acquisition Date   Nov. 22, 2022   Nov. 22, 2022      
Maturity Date Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025  
Principal/Share Amount $ 357 $ 357 $ 357 $ 357      
Investments, amortized cost 357 357 357 357      
Investments, fair value $ 321 $ 321 $ 321 $ 321      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%  
Acquisition Date   Mar. 11, 2022   Mar. 11, 2022      
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Principal/Share Amount $ 3,016 $ 3,016 $ 3,016 $ 3,023      
Investments, amortized cost 2,995 2,995 2,995 3,000      
Investments, fair value $ 3,016 $ 3,016 $ 3,016 $ 3,023      
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%  
Acquisition Date   Feb. 18, 2022   Feb. 18, 2022      
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investments, fair value $ 4 $ 4 $ 4 $ 5      
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%  
Acquisition Date   Feb. 18, 2022   Feb. 18, 2022      
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Principal/Share Amount $ 8,984 $ 8,984 $ 8,984 $ 9,007      
Investments, amortized cost 8,923 8,923 8,923 8,937      
Investments, fair value $ 8,984 $ 8,984 $ 8,984 $ 9,007      
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:FuturePaymentTechnologiesLPMember   whfcl:FuturePaymentTechnologiesLPMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.25% 8.25% 8.25% 8.25% 8.25% 8.25%  
Interest Rate 12.67% 12.67% 12.67% 12.90% 12.67% 12.90%  
Acquisition Date   Dec. 23, 2016   Dec. 23, 2016      
Maturity Date Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 05, 2025 Dec. 07, 2026 Dec. 05, 2025  
Principal/Share Amount $ 20,109 $ 20,109 $ 20,109 $ 20,420      
Investments, amortized cost 20,081 20,081 20,081 20,382      
Investments, fair value $ 20,109 $ 20,109 $ 20,109 $ 20,420      
Percent of net assets 7.10% 7.10% 7.10% 7.10% 7.10% 7.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:G2LatherAcquisitionCorp.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products   Personal Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.32% 9.32% 9.32%   9.32%    
Acquisition Date   Mar. 05, 2025          
Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031    
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:G2LatherAcquisitionCorp.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products   Personal Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.32% 9.32% 9.32%   9.32%    
Acquisition Date   Mar. 05, 2025          
Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031    
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:G2LatherAcquisitionCorp.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products   Personal Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.32% 9.32% 9.32%   9.32%    
Acquisition Date   Mar. 05, 2025          
Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031    
Principal/Share Amount $ 3,929 $ 3,929 $ 3,929        
Investments, amortized cost 3,872 3,872 3,872        
Investments, fair value $ 3,872 $ 3,872 $ 3,872        
Investment, Identifier [Axis]: Geo Logic Systems Ltd.First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:GeoLogicSystemsLtdMember   whfcl:GeoLogicSystemsLtdMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 8.98% 8.98% 8.98% 9.49% 8.98% 9.49%  
Acquisition Date   Jan. 22, 2020   Jan. 22, 2020      
Maturity Date Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026  
Investments, fair value $ 1 $ 1 $ 1 $ 2      
Investment, Identifier [Axis]: Geo Logic Systems Ltd.First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:GeoLogicSystemsLtdMember   whfcl:GeoLogicSystemsLtdMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 8.98% 8.98% 8.98% 9.49% 8.98% 9.49%  
Acquisition Date   Jan. 22, 2020   Jan. 22, 2020      
Maturity Date Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026  
Principal/Share Amount $ 18,279 $ 18,279 $ 18,279 $ 18,415      
Investments, amortized cost 14,135 14,135 14,135 14,234      
Investments, fair value $ 12,703 $ 12,703 $ 12,703 $ 12,883      
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:GulfWindsInternationalAcquisitionLlcMember   whfcl:GulfWindsInternationalAcquisitionLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Interest Rate 11.92% 11.92% 11.92% 11.95% 11.92% 11.95%  
Acquisition Date   Dec. 16, 2022   Dec. 16, 2022      
Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028  
Principal/Share Amount $ 647 $ 647 $ 647 $ 453      
Investments, amortized cost 635 635 635 444      
Investments, fair value $ 631 $ 631 $ 631 $ 447      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:GulfWindsInternationalAcquisitionLlcMember   whfcl:GulfWindsInternationalAcquisitionLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 7.60% 7.50% 7.60%  
Interest Rate 11.92% 11.92% 11.92% 11.96% 11.92% 11.96%  
Acquisition Date   Dec. 16, 2022   Dec. 16, 2022      
Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028  
Principal/Share Amount $ 8,971 $ 8,971 $ 8,971 $ 8,994      
Investments, amortized cost 8,800 8,800 8,800 8,811      
Investments, fair value $ 8,746 $ 8,746 $ 8,746 $ 8,857      
Percent of net assets 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: H I G Camarillo, LP, Limited Partners Interests              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:HIGCamarilloLpMember   whfcl:HIGCamarilloLpMember      
Investment, Type [Extensible Enumeration] whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Acquisition Date   Sep. 25, 2024   Sep. 25, 2024      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.22% 6.22% 6.22% 6.97% 6.22% 6.97%  
Interest Rate 11.01% 11.01% 11.01% 11.29% 11.01% 11.29%  
Acquisition Date   Feb. 18, 2022   Feb. 18, 2022      
Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026  
Principal/Share Amount $ 1,392 $ 1,392 $ 1,392 $ 1,395      
Investments, amortized cost 1,383 1,383 1,383 1,384      
Investments, fair value $ 1,352 $ 1,352 $ 1,352 $ 1,354      
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.69% 10.69% 10.69% 11.02% 10.69% 11.02%  
Acquisition Date   Feb. 18, 2022   Feb. 18, 2022      
Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026  
Principal/Share Amount $ 602 $ 602 $ 602 $ 483      
Investments, amortized cost 599 599 599 480      
Investments, fair value $ 573 $ 573 $ 573 $ 455      
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.69% 10.69% 10.69% 11.02% 10.69% 11.02%  
Acquisition Date   Dec. 28, 2021   Dec. 28, 2021      
Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026  
Principal/Share Amount $ 5,551 $ 5,551 $ 5,551 $ 5,563      
Investments, amortized cost 5,517 5,517 5,517 5,523      
Investments, fair value $ 5,386 $ 5,386 $ 5,386 $ 5,395      
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ITSBuyerIncMember   whfcl:ITSBuyerIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 10.05% 10.05% 10.05% 10.35% 10.05% 10.35%  
Acquisition Date   Feb. 17, 2022   Feb. 17, 2022      
Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026  
Investments, fair value $ 3 $ 3 $ 3 $ 4      
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ITSBuyerIncMember   whfcl:ITSBuyerIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 10.05% 10.05% 10.05% 10.35% 10.05% 10.35%  
Acquisition Date   Feb. 17, 2022   Feb. 17, 2022      
Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026  
Principal/Share Amount $ 3,298 $ 3,298 $ 3,298 $ 3,307      
Investments, amortized cost 3,281 3,281 3,281 3,286      
Investments, fair value $ 3,300 $ 3,300 $ 3,300 $ 3,307      
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Ribbon Communications Operating Company, Inc. [Member]   whfcl:ImageOneIndustriesLLCMember      
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:CommonAUnitsMember whfcl:ClassAUnitsMember whfcl:CommonAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Acquisition Date   Sep. 20, 2019   Sep. 20, 2019      
Investment owned shares | shares 235,000 235,000 235,000 235 235,000 235  
Investments, amortized cost $ 10 $ 10 $ 10 $ 10      
Investments, fair value $ 12 $ 12 $ 12 $ 12      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Impact Advisors, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Technology Health Care Technology Health Care Technology   Health Care Technology    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 4.75% 4.75% 4.75%   4.75%    
Interest Rate 9.06% 9.06% 9.06%   9.06%    
Acquisition Date   Mar. 21, 2025          
Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031   Mar. 21, 2031    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Impact Advisors, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Technology Health Care Technology Health Care Technology   Health Care Technology    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 4.75% 4.75% 4.75%   4.75%    
Interest Rate 9.06% 9.06% 9.06%   9.06%    
Acquisition Date   Mar. 21, 2025          
Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031   Mar. 21, 2031    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Impact Advisors, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Technology Health Care Technology Health Care Technology   Health Care Technology    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 4.75% 4.75% 4.75%   4.75%    
Interest Rate 9.06% 9.06% 9.06%   9.06%    
Acquisition Date   Mar. 21, 2025          
Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031   Mar. 21, 2031    
Principal/Share Amount $ 4,200 $ 4,200 $ 4,200        
Investments, amortized cost 4,158 4,158 4,158        
Investments, fair value $ 4,158 $ 4,158 $ 4,158        
Percent of net assets 1.50% 1.50% 1.50%   1.50%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.75% 5.75% 5.75%   5.75%    
Interest Rate 10.05% 10.05% 10.05%   10.05%    
Acquisition Date   Feb. 19, 2025          
Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.75% 5.75% 5.75%   5.75%    
Interest Rate 10.05% 10.05% 10.05%   10.05%    
Acquisition Date   Mar. 24, 2025          
Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030    
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.75% 5.75% 5.75%   5.75%    
Interest Rate 10.05% 10.05% 10.05%   10.05%    
Acquisition Date   Feb. 19, 2025          
Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030    
Principal/Share Amount $ 2,970 $ 2,970 $ 2,970        
Investments, amortized cost 2,912 2,912 2,912        
Investments, fair value $ 2,912 $ 2,912 $ 2,912        
Percent of net assets 1.00% 1.00% 1.00%   1.00%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.75% 5.75% 5.75%   5.75%    
Interest Rate 10.05% 10.05% 10.05%   10.05%    
Acquisition Date   Mar. 24, 2025          
Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030    
Principal/Share Amount $ 2,545 $ 2,545 $ 2,545        
Investments, amortized cost 2,496 2,496 2,496        
Investments, fair value $ 2,496 $ 2,496 $ 2,496        
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.81% 10.81% 10.81% 10.85% 10.81% 10.85%  
Acquisition Date   Mar. 01, 2022   Mar. 01, 2022      
Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026  
Principal/Share Amount $ 2,337 $ 2,337 $ 2,337 $ 2,343      
Investments, amortized cost 2,322 2,322 2,322 2,326      
Investments, fair value $ 2,337 $ 2,337 $ 2,337 $ 2,343      
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.77% 10.77% 10.77% 10.82% 10.77% 10.82%  
Acquisition Date   Mar. 01, 2022   Mar. 01, 2022      
Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026  
Principal/Share Amount $ 517 $ 517 $ 517 $ 517      
Investments, amortized cost 514 514 514 513      
Investments, fair value $ 521 $ 521 $ 521 $ 522      
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.81% 10.81% 10.81% 10.84% 10.81% 10.84%  
Acquisition Date   Mar. 01, 2022   Mar. 01, 2022      
Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026  
Principal/Share Amount $ 11,049 $ 11,049 $ 11,049 $ 11,078      
Investments, amortized cost 10,981 10,981 10,981 11,000      
Investments, fair value $ 11,049 $ 11,049 $ 11,049 $ 11,078      
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:KoreWirelessGroupIncMember   whfcl:KoreWirelessGroupIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.82% 10.82% 10.82% 11.02% 10.82% 11.02%  
Acquisition Date   Nov. 27, 2023   Nov. 27, 2023      
Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028  
Investments, fair value $ 8 $ 8 $ 8 $ 9      
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:KoreWirelessGroupIncMember   whfcl:KoreWirelessGroupIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.82% 10.82% 10.82% 11.02% 10.82% 11.02%  
Acquisition Date   Nov. 27, 2023   Nov. 27, 2023      
Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028  
Principal/Share Amount $ 6,338 $ 6,338 $ 6,338 $ 6,354      
Investments, amortized cost 6,246 6,246 6,246 6,256      
Investments, fair value $ 6,306 $ 6,306 $ 6,306 $ 6,323      
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Kelso Industries L L C [Member]   Kelso Industries L L C [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.07% 10.07% 10.07% 10.09% 10.07% 10.09%  
Acquisition Date   Dec. 26, 2024   Dec. 26, 2024      
Maturity Date Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029  
Investments, fair value $ (11) $ (11) $ (11)        
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Kelso Industries L L C [Member]   Kelso Industries L L C [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.07% 10.07% 10.07% 10.09% 10.07% 10.09%  
Acquisition Date   Dec. 26, 2024   Dec. 26, 2024      
Maturity Date Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029  
Principal/Share Amount $ 3,981 $ 3,981 $ 3,981 $ 3,611      
Investments, amortized cost 3,910 3,910 3,910 3,539      
Investments, fair value $ 3,911 $ 3,911 $ 3,911 $ 3,539      
Percent of net assets 1.40% 1.40% 1.40% 1.20% 1.40% 1.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Keras Holdings, LLC Shares              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:KerasHoldingsLLCMember   whfcl:KerasHoldingsLLCMember      
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Acquisition Date   Dec. 31, 2020   Dec. 31, 2020      
Investment owned shares | shares 496,000 496,000 496,000 496 496,000 496  
Investments, amortized cost $ 496 $ 496 $ 496 $ 496      
Investments, fair value $ 782 $ 782 $ 782 $ 779      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember   whfcl:LINCSystemsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Interest Rate 12.96% 12.96% 12.96% 12.99% 12.96% 12.99%  
Acquisition Date   Jun. 22, 2021   Jun. 22, 2021      
Maturity Date Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026  
Investments, fair value $ 3 $ 3 $ 3 $ 3      
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember   whfcl:LINCSystemsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Interest Rate 12.96% 12.96% 12.96% 12.99% 12.96% 12.99%  
Acquisition Date   Jun. 22, 2021   Jun. 22, 2021      
Maturity Date Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026  
Principal/Share Amount $ 8,091 $ 8,091 $ 8,091 $ 8,155      
Investments, amortized cost 8,059 8,059 8,059 8,114      
Investments, fair value $ 8,091 $ 8,091 $ 8,091 $ 8,155      
Investment, Identifier [Axis]: LSCS Holdings, Inc. Second Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:LSCSHoldingsIncMember      
Investment, Type [Extensible Enumeration]       whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Life Sciences Tools & Services   Life Sciences Tools & Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       0.50%   0.50%  
Spread Above Index       8.00%   8.00%  
Interest Rate       12.47%   12.47%  
Acquisition Date       Nov. 23, 2021      
Maturity Date       Dec. 16, 2029   Dec. 16, 2029  
Principal/Share Amount       $ 5,000      
Investments, amortized cost       4,953      
Investments, fair value       $ 5,000      
Percent of net assets       1.70%   1.70%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%  
Acquisition Date   Oct. 16, 2019   Oct. 16, 2019      
Maturity Date Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025  
Principal/Share Amount $ 5,006 $ 5,006 $ 5,006 $ 5,020      
Investments, amortized cost 5,006 5,006 5,006 5,020      
Investments, fair value $ 5,006 $ 5,006 $ 5,006 $ 5,020      
Percent of net assets 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%  
Acquisition Date   Sep. 17, 2024   Sep. 17, 2024      
Maturity Date Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025  
Principal/Share Amount $ 437 $ 437 $ 437 $ 437      
Investments, amortized cost 437 437 437 437      
Investments, fair value $ 437 $ 437 $ 437 $ 437      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%  
Acquisition Date   Oct. 16, 2019   Oct. 16, 2019      
Maturity Date Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025  
Principal/Share Amount $ 5,370 $ 5,370 $ 5,370 $ 5,383      
Investments, amortized cost 5,368 5,368 5,368 5,381      
Investments, fair value $ 5,370 $ 5,370 $ 5,370 $ 5,383      
Percent of net assets 1.90% 1.90% 1.90% 1.90% 1.90% 1.90%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LeviathanIntermediateHoldcoLlcMember   whfcl:LeviathanIntermediateHoldcoLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 6.00% 6.00% 6.00% 7.50% 6.00% 7.50%  
Interest Rate 10.32% 10.32% 10.32% 11.98% 10.32% 11.98%  
Acquisition Date   Dec. 27, 2022   Dec. 27, 2022      
Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027  
Principal/Share Amount $ 152 $ 152 $ 152        
Investments, amortized cost 150 150 150        
Investments, fair value $ 149 $ 149 $ 149 $ 10      
Percent of net assets 0.10% 0.10% 0.10%   0.10%    
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LeviathanIntermediateHoldcoLlcMember   whfcl:LeviathanIntermediateHoldcoLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 6.00% 6.00% 6.00% 7.50% 6.00% 7.50%  
Interest Rate 10.30% 10.30% 10.30% 11.98% 10.30% 11.98%  
Acquisition Date   Dec. 27, 2022   Dec. 27, 2022      
Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027  
Principal/Share Amount $ 13,751 $ 13,751 $ 13,751 $ 13,211      
Investments, amortized cost 13,530 13,530 13,530 12,981      
Investments, fair value $ 13,523 $ 13,523 $ 13,523 $ 13,312      
Percent of net assets 4.80% 4.80% 4.80% 4.60% 4.80% 4.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LiftBrandsIncMember   whfcl:LiftBrandsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Interest Rate 11.92% 11.92% 11.92% 11.96% 11.92% 11.96%  
Acquisition Date   Jun. 29, 2020   Jun. 29, 2020      
Maturity Date Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025  
Principal/Share Amount $ 5,447 $ 5,447 $ 5,447 $ 5,461      
Investments, amortized cost 5,443 5,443 5,443 5,453      
Investments, fair value $ 5,447 $ 5,447 $ 5,447 $ 5,461      
Percent of net assets 1.90% 1.90% 1.90% 1.90% 1.90% 1.90%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LiftBrandsIncMember   whfcl:LiftBrandsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Spread Above Index 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%  
PIK interest rate 9.50% 9.50% 9.50%   9.50%    
PIK interest rate       9.50%   9.50%  
Acquisition Date   Jun. 29, 2020   Jun. 29, 2020      
Maturity Date Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025  
Principal/Share Amount $ 1,632 $ 1,632 $ 1,632 $ 1,594      
Investments, amortized cost 1,631 1,631 1,631 1,592      
Investments, fair value $ 1,632 $ 1,632 $ 1,632 $ 1,594      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: LogicMonitor, Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       LogicMonitor, Inc. [Member]      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Systems Software   Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       0.75%   0.75%  
Spread Above Index       5.50%   5.50%  
Interest Rate       9.99%   9.99%  
Acquisition Date       Nov. 19, 2024      
Maturity Date       Nov. 19, 2031   Nov. 19, 2031  
Principal/Share Amount       $ 6,220      
Investments, amortized cost       6,144      
Investments, fair value       $ 6,144      
Percent of net assets       2.10%   2.10%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: LogicMonitor, Inc. - First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   LogicMonitor, Inc. [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software   Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 0.75% 0.75% 0.75%   0.75%    
Spread Above Index 5.50% 5.50% 5.50%   5.50%    
Interest Rate 9.79% 9.79% 9.79%   9.79%    
Acquisition Date   Nov. 19, 2024          
Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031   Nov. 19, 2031    
Principal/Share Amount $ 6,220 $ 6,220 $ 6,220        
Investments, amortized cost 6,147 6,147 6,147        
Investments, fair value $ 6,154 $ 6,154 $ 6,154        
Percent of net assets 2.20% 2.20% 2.20%   2.20%    
Investment, Restriction Status [true false] false false false   false    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: LogicMonitor, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       LogicMonitor, Inc. [Member]      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Systems Software   Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       0.75%   0.75%  
Spread Above Index       5.50%   5.50%  
Interest Rate       9.99%   9.99%  
Acquisition Date       Nov. 19, 2024      
Maturity Date       Nov. 19, 2031   Nov. 19, 2031  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: LogicMonitor, Inc.- First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   LogicMonitor, Inc. [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software   Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 0.75% 0.75% 0.75%   0.75%    
Spread Above Index 5.50% 5.50% 5.50%   5.50%    
Interest Rate 9.79% 9.79% 9.79%   9.79%    
Acquisition Date   Nov. 19, 2024          
Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031   Nov. 19, 2031    
Investments, fair value $ 1 $ 1 $ 1        
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:LuxuryBrandHoldingsIncMember   whfcl:LuxuryBrandHoldingsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.75% 5.50% 5.75%  
Interest Rate 9.82% 9.82% 9.82% 10.11% 9.82% 10.11%  
PIK interest rate       2.00%   2.00%  
Acquisition Date   Dec. 04, 2020   Dec. 04, 2020      
Maturity Date Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026  
Principal/Share Amount $ 4,080 $ 4,080 $ 4,080 $ 4,580      
Investments, amortized cost 4,063 4,063 4,063 4,556      
Investments, fair value $ 4,080 $ 4,080 $ 4,080 $ 4,580      
Percent of net assets 1.40% 1.40% 1.40% 1.60% 1.40% 1.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: M2S Group Intermediate Holdings, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:M2sGroupIntermediateHoldingsIncMember   whfcl:M2sGroupIntermediateHoldingsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper Products Paper Products Paper Products Paper Products Paper Products Paper Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member]  
Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Spread Above Index 4.75% 4.75% 4.75% 4.73% 4.75% 4.73%  
Interest Rate 9.05% 9.05% 9.05% 9.10% 9.05% 9.10%  
Acquisition Date   Aug. 22, 2024   Aug. 22, 2024      
Maturity Date Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031  
Principal/Share Amount $ 9,770 $ 9,770 $ 9,770 $ 9,770      
Investments, amortized cost 9,144 9,144 9,144 9,119      
Investments, fair value $ 9,450 $ 9,450 $ 9,450 $ 9,453      
Percent of net assets 3.40% 3.40% 3.40% 3.30% 3.40% 3.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: MBS Highway, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MbsHighwayLlcMember   whfcl:AlvariaHoldcoMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.50% 8.00% 8.50%  
Interest Rate 12.70% 12.70% 12.70% 13.20% 12.70% 13.20%  
Cash interest rate       12.70%   12.70%  
PIK interest rate       0.50%   0.50%  
Acquisition Date   Oct. 13, 2022   Oct. 13, 2022      
Maturity Date Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027  
Principal/Share Amount $ 9,271 $ 9,271 $ 9,271 $ 9,286      
Investments, amortized cost 9,153 9,153 9,153 9,157      
Investments, fair value $ 9,227 $ 9,227 $ 9,227 $ 9,212      
Percent of net assets 3.30% 3.30% 3.30% 3.20% 3.30% 3.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.97% 5.97% 5.97% 5.97% 5.97% 5.97%  
Interest Rate 10.39% 10.39% 10.39% 10.51% 10.39% 10.51%  
Acquisition Date   May 10, 2023   May 10, 2023      
Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029  
Principal/Share Amount $ 1,332 $ 1,332 $ 1,332 $ 821      
Investments, amortized cost 1,305 1,305 1,305 804      
Investments, fair value $ 1,325 $ 1,325 $ 1,325 $ 817      
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 13.00% 13.00% 13.00% 13.00% 13.00% 13.00%  
Acquisition Date   May 10, 2023   May 10, 2023      
Maturity Date Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028  
Principal/Share Amount $ 241 $ 241 $ 241 $ 241      
Investments, amortized cost 236 236 236 236      
Investments, fair value $ 248 $ 248 $ 248 $ 249      
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.39% 6.39% 6.39% 6.39% 6.39% 6.39%  
Interest Rate 10.81% 10.81% 10.81% 10.85% 10.81% 10.85%  
Acquisition Date   May 10, 2023   May 10, 2023      
Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029  
Principal/Share Amount $ 7,169 $ 7,169 $ 7,169 $ 7,187      
Investments, amortized cost 7,030 7,030 7,030 7,040      
Investments, fair value $ 7,162 $ 7,162 $ 7,162 $ 7,176      
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember   whfcl:MSIInformationServicesIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services Education Services Education Services Education Services Education Services Education Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.82% 8.82% 8.82% 8.82% 8.82% 8.82%  
PIK interest rate 16.10% 16.10% 16.10% 16.11% 16.10% 16.11%  
Acquisition Date   Apr. 25, 2022   Apr. 25, 2022      
Maturity Date Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026  
Principal/Share Amount $ 1,050 $ 1,050 $ 1,050 $ 1,050      
Investments, amortized cost 1,044 1,044 1,044 1,043      
Investments, fair value $ 870 $ 870 $ 870 $ 945      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember   whfcl:MSIInformationServicesIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Education Services Education Services Education Services Education Services Education Services Education Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 9.75% 9.75% 9.75% 9.75% 9.75% 9.75%  
PIK interest rate 14.20% 14.20% 14.20% 14.23% 14.20% 14.23%  
Acquisition Date   Apr. 25, 2022   Apr. 25, 2022      
Maturity Date Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026  
Principal/Share Amount $ 9,099 $ 9,099 $ 9,099 $ 8,746      
Investments, amortized cost 8,558 8,558 8,558 8,552      
Investments, fair value $ 7,539 $ 7,539 $ 7,539 $ 7,871      
Percent of net assets 2.70% 2.70% 2.70% 2.80% 2.70% 2.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   M&M OpCo. LLC (d/b/a Escalent, Inc.)   M&M OpCo. LLC (d/b/a Escalent, Inc.)      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.40% 12.40% 12.40% 12.43% 12.40% 12.43%  
Acquisition Date   Apr. 07, 2023   Apr. 07, 2023      
Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029  
Investments, fair value $ 5 $ 5 $ 5 $ 5      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   M&M OpCo. LLC (d/b/a Escalent, Inc.)   M&M OpCo. LLC (d/b/a Escalent, Inc.)      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.40% 12.40% 12.40% 12.43% 12.40% 12.43%  
Acquisition Date   Apr. 07, 2023   Apr. 07, 2023      
Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029  
Principal/Share Amount $ 4,914 $ 4,914 $ 4,914 $ 4,927      
Investments, amortized cost 4,815 4,815 4,815 4,823      
Investments, fair value $ 4,912 $ 4,912 $ 4,912 $ 4,922      
Percent of net assets 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MarlinDTC-LSMidco2LLCMember   whfcl:MarlinDTC-LSMidco2LLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 11.03% 11.03% 11.03% 11.03% 11.03% 11.03%  
Acquisition Date   Jul. 19, 2019   Jul. 19, 2019      
Maturity Date Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025  
Investments, fair value $ (38) $ (38) $ (38) $ (38)      
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MarlinDTC-LSMidco2LLCMember   whfcl:MarlinDTC-LSMidco2LLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 11.03% 11.03% 11.03% 11.03% 11.03% 11.03%  
Acquisition Date   Jul. 19, 2019   Jul. 19, 2019      
Maturity Date Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025  
Principal/Share Amount $ 18,613 $ 18,613 $ 18,613 $ 18,613      
Investments, amortized cost 18,595 18,595 18,595 18,577      
Investments, fair value $ 17,869 $ 17,869 $ 17,869 $ 17,865      
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Acquisition Date   Sep. 29, 2022   Sep. 29, 2022      
Investment owned shares | shares 4,000 4,000 4,000 4 4,000 4  
Investments, amortized cost $ 400 $ 400 $ 400 $ 400      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.10% 8.10% 8.10% 8.10% 8.10% 8.10%  
Interest Rate 12.54% 12.54% 12.54% 12.56% 12.54% 12.56%  
Acquisition Date   Oct. 07, 2022   Oct. 07, 2022      
Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028  
Principal/Share Amount $ 413 $ 413 $ 413 $ 414      
Investments, amortized cost 410 410 410 411      
Investments, fair value $ 403 $ 403 $ 403 $ 402      
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.10% 8.10% 8.10% 8.10% 8.10% 8.10%  
Interest Rate 12.54% 12.54% 12.54% 12.56% 12.54% 12.56%  
Acquisition Date   Oct. 07, 2022   Oct. 07, 2022      
Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028  
Investments, fair value $ (2) $ (2) $ (2) $ (3)      
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.11% 8.11% 8.11% 8.11% 8.11% 8.11%  
Interest Rate 12.56% 12.56% 12.56% 12.57% 12.56% 12.57%  
Acquisition Date   Oct. 07, 2022   Oct. 07, 2022      
Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028  
Principal/Share Amount $ 6,504 $ 6,504 $ 6,504 $ 6,521      
Investments, amortized cost 6,428 6,428 6,428 6,439      
Investments, fair value $ 6,344 $ 6,344 $ 6,344 $ 6,324      
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.42% 10.42% 10.42% 10.46% 10.42% 10.46%  
Acquisition Date   Dec. 27, 2024   Dec. 27, 2024      
Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Principal/Share Amount $ 945 $ 945 $ 945 $ 947      
Investments, amortized cost 936 936 936 938      
Investments, fair value $ 946 $ 946 $ 946 $ 938      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services us-gaap:HealthcareSectorMember Health Care Services us-gaap:HealthcareSectorMember  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.42% 10.42% 10.42% 10.46% 10.42% 10.46%  
Acquisition Date   Apr. 11, 2023   Apr. 11, 2023      
Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Principal/Share Amount $ 4,989 $ 4,989 $ 4,989 $ 5,002      
Investments, amortized cost 4,891 4,891 4,891 4,898      
Investments, fair value $ 5,039 $ 5,039 $ 5,039 $ 4,986      
Investment, Identifier [Axis]: Maxor Acquisition, Inc.First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services us-gaap:HealthcareSectorMember Health Care Services us-gaap:HealthcareSectorMember  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.42% 10.42% 10.42% 10.46% 10.42% 10.46%  
Acquisition Date   Apr. 11, 2023   Apr. 11, 2023      
Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Investments, fair value $ 10 $ 10 $ 10 $ 9      
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]       whfcl:MedicalDeviceIncMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Health Care Supplies   Health Care Supplies  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor       1.25%   1.25%  
Spread Above Index       6.25%   6.25%  
Interest Rate       10.68%   10.68%  
Acquisition Date       Jul. 27, 2023      
Maturity Date       Jul. 11, 2029   Jul. 11, 2029  
Investments, fair value       $ 6      
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]       whfcl:MedicalDeviceIncMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Health Care Supplies   Health Care Supplies  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor       1.25%   1.25%  
Spread Above Index       6.25%   6.25%  
Interest Rate       10.68%   10.68%  
Acquisition Date       Jul. 27, 2023      
Maturity Date       Jul. 11, 2029   Jul. 11, 2029  
Principal/Share Amount       $ 2,633      
Investments, amortized cost       2,584      
Investments, fair value       $ 2,660      
Investment, Identifier [Axis]: Merriman Holdings LP (d/b/a Escalent, Inc.) Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MerrimanHoldingsLPMember   whfcl:MerrimanHoldingsLPMember      
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Acquisition Date   Apr. 07, 2023   Apr. 07, 2023      
Investment owned shares | shares 327,000 327,000 327,000 327 327,000 327  
Investments, amortized cost $ 333 $ 333 $ 333 $ 333      
Investments, fair value $ 346 $ 346 $ 346 $ 368      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.51% 10.51% 10.51% 10.51% 10.51% 10.51%  
Acquisition Date   Dec. 16, 2021   Dec. 16, 2021      
Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027  
Principal/Share Amount $ 871 $ 871 $ 871 $ 874      
Investments, amortized cost 864 864 864 865      
Investments, fair value $ 871 $ 871 $ 871 $ 874      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.44% 10.44% 10.44% 10.44% 10.44% 10.44%  
Acquisition Date   Dec. 16, 2021   Dec. 16, 2021      
Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027  
Principal/Share Amount $ 1,156 $ 1,156 $ 1,156 $ 1,156      
Investments, amortized cost 1,146 1,146 1,146 1,145      
Investments, fair value $ 1,159 $ 1,159 $ 1,159 $ 1,160      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 8.39% 8.39% 8.39% 8.85% 8.39% 8.85%  
Acquisition Date   Dec. 16, 2021   Dec. 16, 2021      
Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027  
Principal/Share Amount $ 12,008 $ 12,008 $ 12,008 $ 12,039      
Investments, amortized cost 13,431 13,431 13,431 13,449      
Investments, fair value $ 12,965 $ 12,965 $ 12,965 $ 12,465      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member] Pharmaceuticals [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.42% 10.42% 10.42% 10.48% 10.42% 10.48%  
Acquisition Date   Dec. 16, 2021   Dec. 16, 2021      
Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027  
Principal/Share Amount $ 959 $ 959 $ 959 $ 962      
Investments, amortized cost 951 951 951 952      
Investments, fair value $ 959 $ 959 $ 959 $ 962      
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]   Midwest Texas Tea CA, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%  
Acquisition Date   Dec. 22, 2023   Dec. 22, 2023      
Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Principal/Share Amount $ 644 $ 644 $ 644 $ 645      
Investments, amortized cost 632 632 632 632      
Investments, fair value $ 640 $ 640 $ 640 $ 642      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]   Midwest Texas Tea CA, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 6.92% 7.25% 6.92%  
Interest Rate 11.67% 11.67% 11.67% 12.39% 11.67% 12.39%  
Acquisition Date   Dec. 22, 2023   Dec. 22, 2023      
Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Principal/Share Amount $ 229 $ 229 $ 229 $ 326      
Investments, amortized cost 224 224 224 319      
Investments, fair value $ 232 $ 232 $ 232 $ 328      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]   Midwest Texas Tea CA, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%  
Acquisition Date   Dec. 22, 2023   Dec. 22, 2023      
Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Principal/Share Amount $ 9,419 $ 9,419 $ 9,419 $ 9,443      
Investments, amortized cost 9,243 9,243 9,243 9,255      
Investments, fair value $ 9,370 $ 9,370 $ 9,370 $ 9,399      
Percent of net assets 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MonarchCollectiveHoldingsLlcMember   whfcl:MonarchCollectiveHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.05% 11.05% 11.05% 11.16% 11.05% 11.16%  
Acquisition Date   Jan. 10, 2024   Jan. 10, 2024      
Maturity Date Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029  
Principal/Share Amount $ 1,592 $ 1,592 $ 1,592 $ 1,596      
Investments, amortized cost 1,570 1,570 1,570 1,572      
Investments, fair value $ 1,570 $ 1,570 $ 1,570 $ 1,582      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MonarchCollectiveHoldingsLlcMember   whfcl:MonarchCollectiveHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.05% 11.05% 11.05% 11.08% 11.05% 11.08%  
Acquisition Date   Jan. 10, 2024   Jan. 10, 2024      
Maturity Date Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029  
Principal/Share Amount $ 9,283 $ 9,283 $ 9,283 $ 9,306      
Investments, amortized cost 9,107 9,107 9,107 9,119      
Investments, fair value $ 9,156 $ 9,156 $ 9,156 $ 9,223      
Percent of net assets 3.30% 3.30% 3.30% 3.20% 3.30% 3.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MotivationalCIVLLCMember   whfcl:MotivationalCIVLLCMember      
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Acquisition Date   Jul. 12, 2021   Jul. 12, 2021      
Investment owned shares | shares 1,250,000 1,250,000 1,250,000 1,250 1,250,000 1,250  
Investments, amortized cost $ 1,250 $ 1,250 $ 1,250 $ 1,250      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MotivationalMarketingLLCMember   whfcl:MotivationalMarketingLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Interest Rate 12.92% 12.92% 12.92% 13.00% 12.92% 13.00%  
Cash interest rate 5.46% 5.46% 5.46% 11.00% 5.46% 11.00%  
PIK interest rate 7.46% 7.46% 7.46% 2.00% 7.46% 2.00%  
Acquisition Date   Jul. 12, 2021   Jul. 12, 2021      
Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026  
Principal/Share Amount $ 1,182 $ 1,182 $ 1,182 $ 1,182      
Investments, amortized cost 1,176 1,176 1,176 1,175      
Investments, fair value $ 1,099 $ 1,099 $ 1,099 $ 1,061      
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:MotivationalMarketingLLCMember   whfcl:MotivationalMarketingLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%  
Interest Rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%  
Cash interest rate 5.46% 5.46% 5.46% 5.48% 5.46% 5.48%  
PIK interest rate 7.46% 7.46% 7.46% 7.48% 7.46% 7.48%  
Acquisition Date   Jul. 12, 2021   Jul. 12, 2021      
Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026  
Principal/Share Amount $ 10,721 $ 10,721 $ 10,721 $ 10,510      
Investments, amortized cost 10,670 10,670 10,670 10,449      
Investments, fair value $ 9,972 $ 9,972 $ 9,972 $ 9,438      
Percent of net assets 3.40% 3.40% 3.40% 3.20% 3.40% 3.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:NNAServicesLLCMember   whfcl:NNAServicesLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.70% 11.70% 11.70% 11.73% 11.70% 11.73%  
Acquisition Date   Aug. 27, 2021   Aug. 27, 2021      
Maturity Date Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026  
Principal/Share Amount $ 8,292 $ 8,292 $ 8,292 $ 9,125      
Investments, amortized cost 8,263 8,263 8,263 9,087      
Investments, fair value $ 8,152 $ 8,152 $ 8,152 $ 8,941      
Percent of net assets 2.90% 2.90% 2.90% 3.10% 2.90% 3.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:NPAVLessorCorp.Member   whfcl:HRGManagementLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Mar. 01, 2022   Mar. 01, 2022      
Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027  
Principal/Share Amount $ 725 $ 725 $ 725 $ 725      
Investments, amortized cost 720 720 720 719      
Investments, fair value $ 660 $ 660 $ 660 $ 660      
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:NPAVLessorCorp.Member   whfcl:HRGManagementLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member] Real Estate Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Mar. 01, 2022   Mar. 01, 2022      
Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027  
Principal/Share Amount $ 6,454 $ 6,454 $ 6,454 $ 6,502      
Investments, amortized cost 6,407 6,407 6,407 6,448      
Investments, fair value $ 5,876 $ 5,876 $ 5,876 $ 5,918      
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:NavigaIncMember   whfcl:NavigaIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.84% 6.84% 6.84% 6.84% 6.84% 6.84%  
Interest Rate 12.78% 12.78% 12.78% 12.78% 12.78% 12.78%  
Acquisition Date   Jun. 14, 2019   Jun. 14, 2019      
Maturity Date Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024  
Principal/Share Amount $ 301 $ 301 $ 301 $ 301      
Investments, amortized cost 301 301 301 301      
Investments, fair value $ 161 $ 161 $ 161 $ 169      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:NavigaIncMember   whfcl:NavigaIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Interest Rate 12.40% 12.40% 12.40% 12.40% 12.40% 12.40%  
Acquisition Date   Jun. 14, 2019   Jun. 14, 2019      
Maturity Date Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024  
Principal/Share Amount $ 3,140 $ 3,140 $ 3,140 $ 3,140      
Investments, amortized cost 3,140 3,140 3,140 3,140      
Investments, fair value $ 1,683 $ 1,683 $ 1,683 $ 1,763      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: New American Crafts Holdings, LLC Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments Controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:NewAmericanCraftsHoldingsLlcMember   whfcl:NewAmericanCraftsHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Acquisition Date   Mar. 16, 2023   Mar. 16, 2023      
Investment owned shares | shares 1,000 1,000 1,000 1 1,000 1  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.42% 5.42% 5.42% 5.75% 5.42% 5.75%  
Interest Rate 10.79% 10.79% 10.79% 10.15% 10.79% 10.15%  
Acquisition Date   Jun. 14, 2024   Jun. 14, 2024      
Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029  
Principal/Share Amount $ 91 $ 91 $ 91 $ 30      
Investments, amortized cost 90 90 90 30      
Investments, fair value $ 97 $ 97 $ 97 $ 36      
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] whfcl:SecuredOvernightFinancingRateMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.42% 5.42% 5.42% 5.75% 5.42% 5.75%  
Interest Rate 10.79% 10.79% 10.79% 10.15% 10.79% 10.15%  
Acquisition Date   May 14, 2024   May 14, 2024      
Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029  
Principal/Share Amount $ 82 $ 82 $ 82 $ 27      
Investments, amortized cost 81 81 81 27      
Investments, fair value $ 87 $ 87 $ 87 $ 33      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.07% 10.07% 10.07% 10.13% 10.07% 10.13%  
Acquisition Date   Jun. 14, 2024   Jun. 14, 2024      
Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029  
Principal/Share Amount $ 4,509 $ 4,509 $ 4,509 $ 4,520      
Investments, amortized cost 4,434 4,434 4,434 4,441      
Investments, fair value $ 4,502 $ 4,502 $ 4,502 $ 4,505      
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.07% 10.07% 10.07% 10.13% 10.07% 10.13%  
Acquisition Date   May 14, 2024   May 14, 2024      
Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029  
Principal/Share Amount $ 4,058 $ 4,058 $ 4,058 $ 4,068      
Investments, amortized cost 3,991 3,991 3,991 3,997      
Investments, fair value $ 4,051 $ 4,051 $ 4,051 $ 4,054      
Percent of net assets 1.40% 1.40% 1.40% 1.40% 1.40% 1.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PFBHoldcoIncMember   whfcl:PfbHoldingCompanyLlcMember      
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products Building Products Building Products  
Acquisition Date   Dec. 17, 2021   Dec. 17, 2021      
Investment owned shares | shares 1,000 1,000 1,000 1 1,000 1  
Investments, amortized cost $ 24 $ 24 $ 24 $ 24      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: PLTFRM Companies, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:PltfrmCompaniesLlcMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Advertising   Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       3.00%   3.00%  
Spread Above Index       9.00%   9.00%  
Interest Rate       13.34%   13.34%  
Cash interest rate       12.34%   12.34%  
PIK interest rate       1.00%   1.00%  
Acquisition Date       Jan. 29, 2024      
Maturity Date       Jan. 29, 2029   Jan. 29, 2029  
Principal/Share Amount       $ 889      
Investments, amortized cost       867      
Investments, fair value       $ 916      
Percent of net assets       0.30%   0.30%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: PLTFRM Companies, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:PltfrmCompaniesLlcMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Advertising   Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember  
Floor       3.00%   3.00%  
Spread Above Index       9.00%   9.00%  
Interest Rate       13.36%   13.36%  
Cash interest rate       12.36%   12.36%  
PIK interest rate       1.00%   1.00%  
Acquisition Date       Jan. 29, 2024      
Maturity Date       Jan. 29, 2029   Jan. 29, 2029  
Principal/Share Amount       $ 7,950      
Investments, amortized cost       7,757      
Investments, fair value       $ 8,188      
Percent of net assets       3.00%   3.00%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PatagoniaHoldcoLLCMember   whfcl:PatagoniaHoldcoLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.05% 10.05% 10.05% 10.27% 10.05% 10.27%  
Acquisition Date   Aug. 05, 2022   Aug. 05, 2022      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Principal/Share Amount $ 14,259 $ 14,259 $ 14,259 $ 14,296      
Investments, amortized cost 12,661 12,661 12,661 12,602      
Investments, fair value $ 13,104 $ 13,104 $ 13,104 $ 13,135      
Percent of net assets 4.70% 4.70% 4.70% 4.60% 4.70% 4.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.50% 5.50% 5.50%   5.50%    
Interest Rate 9.95% 9.95% 9.95%   9.95%    
Acquisition Date   Jan. 28, 2025          
Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029   Feb. 07, 2029    
Principal/Share Amount $ 22 $ 22 $ 22        
Investments, amortized cost 21 21 21        
Investments, fair value $ 22 $ 22 $ 22        
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]   Pavement Partners Interco, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 6.75% 5.50% 6.75%  
Interest Rate 9.95% 9.95% 9.95% 11.23% 9.95% 11.23%  
Acquisition Date   Jan. 29, 2025   Mar. 17, 2023      
Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2028 Feb. 07, 2029 Feb. 07, 2028  
Principal/Share Amount $ 568 $ 568 $ 568 $ 569      
Investments, amortized cost 558 558 558 558      
Investments, fair value $ 568 $ 568 $ 568 $ 569      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.50% 5.50% 5.50%   5.50%    
Interest Rate 9.95% 9.95% 9.95%   9.95%    
Acquisition Date   Jan. 28, 2025          
Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029   Feb. 07, 2029    
Principal/Share Amount $ 7 $ 7 $ 7        
Investments, amortized cost 7 7 7        
Investments, fair value $ 7 $ 7 $ 7        
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]   Pavement Partners Interco, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 6.75% 5.50% 6.75%  
Interest Rate 9.95% 9.95% 9.95% 11.23% 9.95% 11.23%  
Acquisition Date   Jan. 29, 2025   Mar. 17, 2023      
Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2028 Feb. 07, 2029 Feb. 07, 2028  
Principal/Share Amount $ 246 $ 246 $ 246 $ 338      
Investments, amortized cost 241 241 241 331      
Investments, fair value $ 250 $ 250 $ 250 $ 341      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.50% 5.50% 5.50%   5.50%    
Interest Rate 9.95% 9.95% 9.95%   9.95%    
Acquisition Date   Jan. 28, 2025          
Maturity Date Feb. 08, 2029 Feb. 08, 2029 Feb. 08, 2029   Feb. 08, 2029    
Principal/Share Amount $ 162 $ 162 $ 162        
Investments, amortized cost 161 161 161        
Investments, fair value $ 162 $ 162 $ 162        
Percent of net assets 0.10% 0.10% 0.10%   0.10%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]   Pavement Partners Interco, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 6.75% 5.50% 6.75%  
Interest Rate 9.95% 9.95% 9.95% 11.23% 9.95% 11.23%  
Acquisition Date   Jan. 28, 2025   Mar. 17, 2023      
Maturity Date Feb. 08, 2029 Feb. 08, 2029 Feb. 08, 2029 Feb. 07, 2028 Feb. 08, 2029 Feb. 07, 2028  
Principal/Share Amount $ 5,104 $ 5,104 $ 5,104 $ 5,117      
Investments, amortized cost 5,009 5,009 5,009 5,015      
Investments, fair value $ 5,101 $ 5,101 $ 5,101 $ 5,111      
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PirtekHoldcoLLCMember   whfcl:PirtekHoldcoLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 9.95% 9.95% 9.95% 9.95% 9.95% 9.95%  
Acquisition Date   Oct. 31, 2023   Oct. 31, 2023      
Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028  
Investments, fair value $ 16 $ 16 $ 16 $ 17      
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PirtekHoldcoLLCMember   whfcl:PirtekHoldcoLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 9.95% 9.95% 9.95% 9.95% 9.95% 9.95%  
Acquisition Date   Oct. 31, 2023   Oct. 31, 2023      
Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028  
Principal/Share Amount $ 6,908 $ 6,908 $ 6,908 $ 7,425      
Investments, amortized cost 6,796 6,796 6,796 7,298      
Investments, fair value $ 6,973 $ 6,973 $ 6,973 $ 7,425      
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember   whfcl:PlaymonsterGroupEquityIncMember      
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Leisure Products   Leisure Products  
Acquisition Date       Jan. 24, 2022      
Investment owned shares | shares       72   72  
Investments, amortized cost       $ 460      
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       true   true  
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember          
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember   us-gaap:PreferredStockMember    
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments   Non-controlled affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember          
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]   Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products   Leisure Products    
Acquisition Date   Jan. 24, 2022          
Investment owned shares | shares 72,000 72,000 72,000   72,000    
Investments, amortized cost $ 460 $ 460 $ 460        
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember   whfcl:PlaymonsterGroupEquityIncMember      
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Spread Above Index 14.00% 14.00% 14.00% 14.00% 14.00% 14.00%  
PIK interest rate 14.00% 14.00% 14.00% 14.00% 14.00% 14.00%  
Acquisition Date   Jan. 24, 2022   Jan. 24, 2022      
Investment owned shares | shares 36,000 36,000 36,000 36 36,000 36  
Investments, amortized cost $ 3,600 $ 3,600 $ 3,600 $ 3,600      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] true true true true true true  
Investment, Identifier [Axis]: Playmonster Group LLC, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupLLCMember   whfcl:PlaymonsterGroupLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%  
PIK interest rate 13.44% 13.44% 13.44% 13.74% 13.44% 13.74%  
Acquisition Date   Jun. 07, 2021   Jun. 07, 2021      
Maturity Date Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026  
Principal/Share Amount $ 5,062 $ 5,062 $ 5,062 $ 4,890      
Investments, amortized cost 3,661 3,661 3,661 3,661      
Investments, fair value $ 1,601 $ 1,601 $ 1,601 $ 1,635     1,363
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Playmonster Group LLC, Priority First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupLLCMember   whfcl:PlaymonsterGroupLLCMember      
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
PIK interest rate 11.21% 11.21% 11.21% 11.41% 11.21% 11.41%  
Acquisition Date   Dec. 09, 2022   Dec. 09, 2022      
Maturity Date Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026  
Principal/Share Amount $ 1,326 $ 1,326 $ 1,326 $ 1,289      
Investments, amortized cost 1,315 1,315 1,315 1,275      
Investments, fair value $ 1,206 $ 1,206 $ 1,206 $ 1,172     1,015
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Power Service Group CR Acquisition Inc First Lien Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PowerServiceGroupCrAcquisitionIncMember   whfcl:PowerServiceGroupCrAcquisitionIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%  
Acquisition Date   Jul. 11, 2022   Jul. 11, 2022      
Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026  
Principal/Share Amount $ 1,283 $ 1,283 $ 1,283 $ 1,340      
Investments, amortized cost 1,274 1,274 1,274 1,329      
Investments, fair value $ 1,296 $ 1,296 $ 1,296 $ 1,354      
Percent of net assets 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Power Service Group CR Acquisition Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PowerServiceGroupCrAcquisitionIncMember   whfcl:PowerServiceGroupCrAcquisitionIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment Heavy Electrical Equipment  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%  
Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%  
Acquisition Date   Jun. 25, 2021   Jun. 25, 2021      
Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026  
Principal/Share Amount $ 8,325 $ 8,325 $ 8,325 $ 8,697      
Investments, amortized cost 8,281 8,281 8,281 8,642      
Investments, fair value $ 8,408 $ 8,408 $ 8,408 $ 8,784      
Percent of net assets 3.00% 3.00% 3.00% 3.10% 3.00% 3.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PressurizedHoldingsLlcMember   whfcl:PressurizedHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals  
Acquisition Date   Mar. 16, 2023   Mar. 16, 2023      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Preferred Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:PressurizedHoldingsLlcMember   whfcl:PressurizedHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals  
Spread Above Index 14.00% 14.00% 14.00% 14.00% 14.00% 14.00%  
PIK interest rate 14.00% 14.00% 14.00% 14.00% 14.00% 14.00%  
Acquisition Date   Mar. 16, 2023   Mar. 16, 2023      
Investments, amortized cost $ 4,537 $ 4,537 $ 4,537 $ 4,537      
Investments, fair value $ 2,222 $ 2,222 $ 2,222 $ 1,657     251
Percent of net assets 0.80% 0.80% 0.80% 0.60% 0.80% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] true true true true true true  
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]       whfcl:PrincipalLightingGroupLlcMember      
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Electrical Components And Equipment [Member]   Electrical Components And Equipment [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor       1.00%   1.00%  
Spread Above Index       5.25%   5.25%  
Interest Rate       9.81%   9.81%  
Acquisition Date       Dec. 03, 2024      
Maturity Date       Nov. 04, 2030   Nov. 04, 2030  
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PrincipalLightingGroupLlcMember   whfcl:PrincipalLightingGroupLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Electrical Components And Equipment [Member] Electrical Components And Equipment [Member] Electrical Components And Equipment [Member] Electrical Components And Equipment [Member] Electrical Components And Equipment [Member] Electrical Components And Equipment [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%  
Interest Rate 9.54% 9.54% 9.54% 9.81% 9.54% 9.81%  
Acquisition Date   Dec. 03, 2024   Dec. 03, 2024      
Maturity Date Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030  
Principal/Share Amount $ 3,522 $ 3,522 $ 3,522 $ 3,531      
Investments, amortized cost 3,472 3,472 3,472 3,479      
Investments, fair value $ 3,472 $ 3,472 $ 3,472 $ 3,479      
Investment, Identifier [Axis]: Quest Events, LLC Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonAUnitsMember whfcl:CommonUnitsMember whfcl:CommonAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Acquisition Date   Dec. 28, 2018   Dec. 28, 2018      
Investment owned shares | shares 333,000 333,000 333,000 333 333,000 333  
Investments, amortized cost $ 376 $ 376 $ 376 $ 376      
Investments, fair value $ 154 $ 154 $ 154 $ 149      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services   Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]   Base Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 6.25% 6.25% 6.25%   6.25%    
Interest Rate 13.02% 13.02% 13.02%   13.02%    
Acquisition Date   Mar. 21, 2025          
Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026   Sep. 30, 2026    
Principal/Share Amount $ 177 $ 177 $ 177        
Investments, amortized cost 173 173 173        
Investments, fair value $ 175 $ 175 $ 175        
Percent of net assets 0.10% 0.10% 0.10%   0.10%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 2.00% 1.00% 2.00%  
Spread Above Index 6.25% 6.25% 6.25% 7.00% 6.25% 7.00%  
Interest Rate 13.02% 13.02% 13.02% 11.59% 13.02% 11.59%  
Acquisition Date   Jul. 19, 2019   Jul. 19, 2019      
Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Principal/Share Amount $ 412 $ 412 $ 412 $ 247      
Investments, amortized cost 411 411 411 246      
Investments, fair value $ 406 $ 406 $ 406 $ 248      
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.80% 10.80% 10.80% 10.90% 10.80% 10.90%  
Acquisition Date   Sep. 13, 2024   Sep. 13, 2024      
Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Principal/Share Amount $ 1,267 $ 1,267 $ 1,267 $ 480      
Investments, amortized cost 1,244 1,244 1,244 472      
Investments, fair value $ 1,244 $ 1,244 $ 1,244 $ 473      
Percent of net assets 0.40% 0.40% 0.40% 0.20% 0.40% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%  
Interest Rate 11.56% 11.56% 11.56% 11.59% 11.56% 11.59%  
Acquisition Date   Jul. 19, 2019   Jul. 19, 2019      
Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Principal/Share Amount $ 11,562 $ 11,562 $ 11,562 $ 11,592      
Investments, amortized cost 11,537 11,537 11,537 11,563      
Investments, fair value $ 11,415 $ 11,415 $ 11,415 $ 11,592      
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%  
Interest Rate 9.44% 9.44% 9.44% 9.99% 9.44% 9.99%  
Acquisition Date   Jan. 27, 2021   Jan. 27, 2021      
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Principal/Share Amount $ 2,938 $ 2,938 $ 2,938 $ 2,946      
Investments, amortized cost 2,916 2,916 2,916 2,922      
Investments, fair value $ 2,938 $ 2,938 $ 2,938 $ 2,946      
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%  
Interest Rate 9.44% 9.44% 9.44% 9.99% 9.44% 9.99%  
Acquisition Date   Jan. 27, 2021   Jan. 27, 2021      
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investments, fair value $ 10 $ 10 $ 10 $ 11      
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%  
Interest Rate 9.45% 9.45% 9.45% 9.73% 9.45% 9.73%  
Acquisition Date   Jan. 27, 2021   Jan. 27, 2021      
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Principal/Share Amount $ 10,894 $ 10,894 $ 10,894 $ 10,923      
Investments, amortized cost 10,816 10,816 10,816 10,839      
Investments, fair value $ 10,894 $ 10,894 $ 10,894 $ 10,923      
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:RLJPro-VacInc.Member   whfcl:RLJPro-VacInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.71% 10.71% 10.71% 10.71% 10.71% 10.71%  
Acquisition Date   Jan. 23, 2024   Jan. 23, 2024      
Maturity Date Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026  
Principal/Share Amount $ 6,642 $ 6,642 $ 6,642 $ 6,659      
Investments, amortized cost 6,561 6,561 6,561 6,566      
Investments, fair value $ 6,613 $ 6,613 $ 6,613 $ 6,637      
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Ribbon Communications Operating Company, Inc. [Member]   Ribbon Communications Operating Company, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.57% 10.57% 10.57% 10.59% 10.57% 10.59%  
Acquisition Date   Jun. 21, 2024   Jun. 21, 2024      
Maturity Date Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029  
Investments, fair value $ 14 $ 14 $ 14 $ 9      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Ribbon Communications Operating Company, Inc. [Member]   Ribbon Communications Operating Company, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.57% 10.57% 10.57% 10.59% 10.57% 10.59%  
Acquisition Date   Jun. 21, 2024   Jun. 21, 2024      
Maturity Date Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029  
Principal/Share Amount $ 8,734 $ 8,734 $ 8,734 $ 8,756      
Investments, amortized cost 8,586 8,586 8,586 8,600      
Investments, fair value $ 8,724 $ 8,724 $ 8,724 $ 8,692      
Percent of net assets 3.10% 3.10% 3.10% 3.00% 3.10% 3.00%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:Ross-SimonsTopcoLPMember   whfcl:Ross-SimonsTopcoLPMember      
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
PIK interest rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Acquisition Date   Dec. 04, 2020   Dec. 04, 2020      
Investment owned shares | shares 600,000 600,000 600,000 600 600,000 600  
Investments, amortized cost $ 514 $ 514 $ 514 $ 514      
Investments, fair value $ 776 $ 776 $ 776 $ 756      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] true true true true true true  
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:ScicBuyerInc.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products   Building Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.30% 9.30% 9.30%   9.30%    
Acquisition Date   Mar. 28, 2025          
Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031   Mar. 28, 2031    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:ScicBuyerInc.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products   Building Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.30% 9.30% 9.30%   9.30%    
Acquisition Date   Mar. 28, 2025          
Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031   Mar. 28, 2031    
Principal/Share Amount $ 295 $ 295 $ 295        
Investments, amortized cost 291 291 291        
Investments, fair value $ 291 $ 291 $ 291        
Percent of net assets 0.10% 0.10% 0.10%   0.10%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:ScicBuyerInc.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products   Building Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.30% 9.30% 9.30%   9.30%    
Acquisition Date   Mar. 28, 2025          
Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031   Mar. 28, 2031    
Principal/Share Amount $ 9,159 $ 9,159 $ 9,159        
Investments, amortized cost 9,022 9,022 9,022        
Investments, fair value $ 9,022 $ 9,022 $ 9,022        
Percent of net assets 3.20% 3.20% 3.20%   3.20%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: Salon Republic Holdings, LLC Common Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:SalonRepublicInvestmentsLlcMember      
Investment, Type [Extensible Enumeration]       Common Stock [Member]   Common Stock [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Specialized Consumer Services   Specialized Consumer Services  
Acquisition Date       Dec. 02, 2022      
Investment owned shares | shares       400   400  
Investments, amortized cost       $ 400      
Investments, fair value       $ 132      
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       true   true  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%  
Acquisition Date   Dec. 02, 2022   Dec. 02, 2022      
Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027  
Principal/Share Amount $ 1,664 $ 1,664 $ 1,664 $ 1,669      
Investments, amortized cost 1,641 1,641 1,641 1,641      
Investments, fair value $ 1,666 $ 1,666 $ 1,666 $ 1,672      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%  
Acquisition Date   Dec. 02, 2022   Dec. 02, 2022      
Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027  
Investments, fair value $ 11 $ 11 $ 11 $ 13      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%  
Acquisition Date   Dec. 02, 2022   Dec. 02, 2022      
Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027  
Principal/Share Amount $ 5,065 $ 5,065 $ 5,065 $ 5,076      
Investments, amortized cost 4,984 4,984 4,984 4,988      
Investments, fair value $ 5,050 $ 5,050 $ 5,050 $ 5,063      
Percent of net assets 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC, Preferred Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:SalonRepublicInvestmentsLlcMember      
Investment, Type [Extensible Enumeration]       us-gaap:PreferredStockMember   us-gaap:PreferredStockMember  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Specialized Consumer Services   Specialized Consumer Services  
Spread Above Index       8.00%   8.00%  
Acquisition Date       Dec. 02, 2022      
Investment owned shares | shares       200   200  
Investments, amortized cost       $ 200      
Investments, fair value       $ 242      
Percent of net assets       0.10%   0.10%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       true   true  
Investment, Identifier [Axis]: Salon Republic Investments LLC Common Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicInvestmentsLlcMember          
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]   Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services   Specialized Consumer Services    
Acquisition Date   Dec. 02, 2022          
Investment owned shares | shares 400,000 400,000 400,000   400,000    
Investments, amortized cost $ 400 $ 400 $ 400        
Investments, fair value $ 62 $ 62 $ 62        
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Identifier [Axis]: Salon Republic Investments LLC Preferred Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicInvestmentsLlcMember          
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember   us-gaap:PreferredStockMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services Specialized Consumer Services Specialized Consumer Services   Specialized Consumer Services    
Spread Above Index 8.00% 8.00% 8.00%   8.00%    
PIK interest rate 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%  
Acquisition Date   Dec. 02, 2022          
Investment owned shares | shares 200,000 200,000 200,000   200,000    
Investments, amortized cost $ 200 $ 200 $ 200        
Investments, fair value $ 247 $ 247 $ 247        
Percent of net assets 0.10% 0.10% 0.10%   0.10%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] true true true   true    
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SleepOpCoLLCMember   whfcl:SleepOpCoLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings Home Furnishings Home Furnishings Home Furnishings Home Furnishings Home Furnishings  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.95% 10.95% 10.95% 11.28% 10.95% 11.28%  
Acquisition Date   Oct. 12, 2021   Oct. 12, 2021      
Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026  
Investments, fair value $ 2 $ 2 $ 2 $ 5      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SleepOpCoLLCMember   whfcl:SleepOpCoLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings Home Furnishings Home Furnishings Home Furnishings Home Furnishings Home Furnishings  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.95% 10.95% 10.95% 11.28% 10.95% 11.28%  
Acquisition Date   Oct. 12, 2021   Oct. 12, 2021      
Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026  
Principal/Share Amount $ 22,445 $ 22,445 $ 22,445 $ 22,590      
Investments, amortized cost 22,283 22,283 22,283 22,401      
Investments, fair value $ 22,309 $ 22,309 $ 22,309 $ 22,441      
Percent of net assets 7.90% 7.90% 7.90% 7.80% 7.90% 7.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member   whfcl:SmaltoInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.20% 10.20% 10.20% 10.21% 10.20% 10.21%  
Acquisition Date   May 04, 2022   May 04, 2022      
Maturity Date Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028  
Principal/Share Amount $ 978 $ 978 $ 978 $ 978      
Investments, amortized cost 968 968 968 967      
Investments, fair value $ 978 $ 978 $ 978 $ 978      
Investment, Identifier [Axis]: Smalto Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member   whfcl:SmaltoInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 8.36% 8.36% 8.36% 8.86% 8.36% 8.86%  
Acquisition Date   May 04, 2022   May 04, 2022      
Maturity Date Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028  
Principal/Share Amount $ 6,423 $ 6,423 $ 6,423 $ 6,423      
Investments, amortized cost 6,691 6,691 6,691 6,682      
Investments, fair value $ 6,947 $ 6,947 $ 6,947 $ 6,654      
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember      
Investment, Type [Extensible Enumeration] us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Acquisition Date   Jun. 29, 2020   Jun. 29, 2020      
Investment owned shares | shares 2,000 2,000 2,000 2 2,000 2  
Investments, amortized cost $ 1,941 $ 1,941 $ 1,941 $ 1,941      
Investments, fair value $ 282 $ 282 $ 282 $ 173      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Spread Above Index 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%  
PIK interest rate 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%  
Acquisition Date   Jun. 29, 2020   Jun. 29, 2020      
Principal/Share Amount $ 1,865 $ 1,865 $ 1,865 $ 1,822      
Investments, amortized cost 1,862 1,862 1,862 1,819      
Investments, fair value $ 1,831 $ 1,831 $ 1,831 $ 1,790      
Percent of net assets 0.70% 0.70% 0.70% 0.60% 0.70% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember      
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities Leisure Facilities  
Acquisition Date   Jun. 29, 2020   Jun. 29, 2020      
Investment owned shares | shares 1,000 1,000 1,000 1 1,000 1  
Investments, amortized cost $ 793 $ 793 $ 793 $ 793      
Investments, fair value $ 114 $ 114 $ 114 $ 70      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SourceCodeHoldingsLLCMember   whfcl:SourceCodeHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Aug. 10, 2021   Aug. 10, 2021      
Maturity Date Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027  
Principal/Share Amount $ 3,862 $ 3,862 $ 3,862 $ 3,872      
Investments, amortized cost 3,832 3,832 3,832 3,839      
Investments, fair value $ 3,862 $ 3,862 $ 3,862 $ 3,854      
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SourceCodeHoldingsLLCMember   whfcl:SourceCodeHoldingsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%  
Acquisition Date   Aug. 10, 2021   Aug. 10, 2021      
Maturity Date Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027  
Principal/Share Amount $ 14,124 $ 14,124 $ 14,124 $ 14,162      
Investments, amortized cost 14,015 14,015 14,015 14,041      
Investments, fair value $ 14,124 $ 14,124 $ 14,124 $ 14,095      
Investment, Identifier [Axis]: Sterling Pure Blocker, LLC (d/b/a Banner Industries, Inc.) Class B Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:SterlingPureBlockerLlcMember   whfcl:SterlingPureBlockerLlcMember      
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Acquisition Date   Dec. 01, 2023   Dec. 01, 2023      
Investment owned shares | shares 404,000 404,000 404,000 404 404,000 404  
Investments, amortized cost $ 404 $ 404 $ 404 $ 404      
Investments, fair value $ 285 $ 285 $ 285 $ 388      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Surge Amuze Holdings Inc [Member]   Surge Amuze Holdings Inc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.46% 10.46% 10.46% 10.46% 10.46% 10.46%  
Acquisition Date   Sep. 06, 2024   Sep. 06, 2024      
Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029  
Principal/Share Amount $ 582 $ 582 $ 582 $ 584      
Investments, amortized cost 572 572 572 573      
Investments, fair value $ 583 $ 583 $ 583 $ 577      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Surge Amuze Holdings Inc [Member]   Surge Amuze Holdings Inc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Prime Rate [Member] Base Rate [Member] Prime Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.20% 5.20% 5.20% 5.00% 5.20% 5.00%  
Interest Rate 12.05% 12.05% 12.05% 12.50% 12.05% 12.50%  
Acquisition Date   Sep. 06, 2024   Sep. 06, 2024      
Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029  
Principal/Share Amount $ 732 $ 732 $ 732 $ 585      
Investments, amortized cost 719 719 719 574      
Investments, fair value $ 724 $ 724 $ 724 $ 576      
Percent of net assets 0.30% 0.30% 0.30% 0.20% 0.30% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Surge Amuze Holdings Inc [Member]   Surge Amuze Holdings Inc [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.30% 10.30% 10.30% 10.44% 10.30% 10.44%  
Acquisition Date   Sep. 06, 2024   Sep. 06, 2024      
Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029  
Principal/Share Amount $ 5,722 $ 5,722 $ 5,722 $ 5,737      
Investments, amortized cost 5,621 5,621 5,621 5,629      
Investments, fair value $ 5,665 $ 5,665 $ 5,665 $ 5,643      
Percent of net assets 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Tot Group, Inc. [Member]   Tot Group, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.50% 7.25% 7.50%  
Interest Rate 11.55% 11.55% 11.55% 11.83% 11.55% 11.83%  
Acquisition Date   Jun. 28, 2024   Jun. 28, 2024      
Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029  
Principal/Share Amount $ 1,107 $ 1,107 $ 1,107        
Investments, amortized cost 1,084 1,084 1,084        
Investments, fair value $ 1,084 $ 1,084 $ 1,084 $ (1)      
Percent of net assets 0.40% 0.40% 0.40%   0.40%    
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Tot Group, Inc. [Member]   Tot Group, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.50% 7.25% 7.50%  
Interest Rate 11.55% 11.55% 11.55% 11.83% 11.55% 11.83%  
Acquisition Date   Jun. 28, 2024   Jun. 28, 2024      
Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Tot Group, Inc. [Member]   Tot Group, Inc. [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services Transaction & Payment Processing Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.50% 7.25% 7.50%  
Interest Rate 11.55% 11.55% 11.55% 11.83% 11.55% 11.83%  
Acquisition Date   Jun. 28, 2024   Jun. 28, 2024      
Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029  
Principal/Share Amount $ 9,180 $ 9,180 $ 9,180 $ 8,239      
Investments, amortized cost 9,002 9,002 9,002 8,074      
Investments, fair value $ 9,006 $ 9,006 $ 9,006 $ 8,067      
Percent of net assets 3.30% 3.30% 3.30% 2.80% 3.30% 2.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TabletrustBrandsLlcMember   whfcl:TabletrustBrandsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%  
Interest Rate 10.17% 10.17% 10.17% 10.22% 10.17% 10.22%  
Acquisition Date   Dec. 24, 2024   Dec. 24, 2024      
Maturity Date Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028  
Principal/Share Amount $ 2,499 $ 2,499 $ 2,499 $ 2,505      
Investments, amortized cost 2,464 2,464 2,464 2,468      
Investments, fair value $ 2,469 $ 2,469 $ 2,469 $ 2,468      
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Telestream Holdings Corporation [Member]   Telestream Holdings Corporation [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 9.75% 9.75% 9.75% 9.75% 9.75% 9.75%  
PIK interest rate 14.17% 14.17% 14.17% 14.21% 14.17% 14.21%  
Acquisition Date   Oct. 15, 2020   Oct. 15, 2020      
Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025  
Principal/Share Amount $ 1,156 $ 1,156 $ 1,156 $ 1,116      
Investments, amortized cost 1,051 1,051 1,051 1,051      
Investments, fair value $ 1,027 $ 1,027 $ 1,027 $ 1,009      
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Telestream Holdings Corporation [Member]   Telestream Holdings Corporation [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 9.75% 9.75% 9.75% 9.75% 9.75% 9.75%  
PIK interest rate 14.17% 14.17% 14.17% 14.21% 14.17% 14.21%  
Acquisition Date   Oct. 15, 2020   Oct. 15, 2020      
Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025  
Principal/Share Amount $ 19,213 $ 19,213 $ 19,213 $ 18,547      
Investments, amortized cost 17,496 17,496 17,496 17,496      
Investments, fair value $ 17,416 $ 17,416 $ 17,416 $ 17,063      
Percent of net assets 6.20% 6.20% 6.20% 5.90% 6.20% 5.90%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CromCorporationMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Water Utilities [Member] Water Utilities [Member] Water Utilities [Member]   Water Utilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.25% 5.25% 5.25%   5.25%    
Interest Rate 9.54% 9.54% 9.54%   9.54%    
Acquisition Date   Mar. 05, 2025          
Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031    
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CromCorporationMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Water Utilities [Member] Water Utilities [Member] Water Utilities [Member]   Water Utilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.25% 5.25% 5.25%   5.25%    
Interest Rate 9.54% 9.54% 9.54%   9.54%    
Acquisition Date   Mar. 05, 2025          
Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031    
Principal/Share Amount $ 144 $ 144 $ 144        
Investments, amortized cost 142 142 142        
Investments, fair value $ 142 $ 142 $ 142        
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CromCorporationMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Water Utilities [Member] Water Utilities [Member] Water Utilities [Member]   Water Utilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.25% 5.25% 5.25%   5.25%    
Interest Rate 9.54% 9.54% 9.54%   9.54%    
Acquisition Date   Mar. 05, 2025          
Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031    
Principal/Share Amount $ 4,080 $ 4,080 $ 4,080        
Investments, amortized cost 4,020 4,020 4,020        
Investments, fair value $ 4,020 $ 4,020 $ 4,020        
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:TheKyjenCompanyLLCMember   whfcl:TheKyjenCompanyLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products Household Products Household Products Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 6.50% 7.50% 6.50%  
Interest Rate 11.95% 11.95% 11.95% 10.97% 11.95% 10.97%  
Cash interest rate 10.95% 10.95% 10.95% 10.22% 10.95% 10.22%  
PIK interest rate 1.00% 1.00% 1.00% 0.75% 1.00% 0.75%  
Acquisition Date   Apr. 05, 2021   Apr. 05, 2021      
Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026  
Principal/Share Amount $ 375 $ 375 $ 375 $ 798      
Investments, amortized cost 374 374 374 795      
Investments, fair value $ 321 $ 321 $ 321 $ 761      
Percent of net assets 0.10% 0.10% 0.10% 0.30% 0.10% 0.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:TheKyjenCompanyLLCMember   whfcl:TheKyjenCompanyLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products Household Products Household Products Household Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 7.25% 7.50% 7.25%  
Interest Rate 11.93% 11.93% 11.93% 12.05% 11.93% 12.05%  
Cash interest rate 10.93% 10.93% 10.93% 11.30% 10.93% 11.30%  
PIK interest rate 1.00% 1.00% 1.00% 0.75% 1.00% 0.75%  
Acquisition Date   Apr. 05, 2021   Apr. 05, 2021      
Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026  
Principal/Share Amount $ 11,345 $ 11,345 $ 11,345 $ 11,350      
Investments, amortized cost 11,311 11,311 11,311 11,309      
Investments, fair value $ 10,668 $ 10,668 $ 10,668 $ 10,895      
Percent of net assets 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:TokenBuyerIncMember   whfcl:TokenBuyerIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.44% 10.44% 10.44% 10.74% 10.44% 10.74%  
Acquisition Date   May 26, 2022   May 26, 2022      
Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029  
Principal/Share Amount $ 5,031 $ 5,031 $ 5,031 $ 7,070      
Investments, amortized cost 4,841 4,841 4,841 6,709      
Investments, fair value $ 3,773 $ 3,773 $ 3,773 $ 5,658      
Percent of net assets 1.30% 1.30% 1.30% 2.00% 1.30% 2.00%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Trailhead Media LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Trailhead Media L L C [Member]   Trailhead Media L L C [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 9.80% 9.80% 9.80% 9.82% 9.80% 9.82%  
Cash interest rate 9.05% 9.05% 9.05% 9.07% 9.05% 9.07%  
PIK interest rate 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Acquisition Date   Jan. 22, 2025   Dec. 30, 2024      
Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029  
Investments, fair value $ 4 $ 4 $ 4        
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Trailhead Media L L C [Member]   Trailhead Media L L C [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Acquisition Date   Jan. 22, 2025   Dec. 30, 2024      
Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029  
Investments, fair value $ 1 $ 1 $ 1        
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   Trailhead Media L L C [Member]   Trailhead Media L L C [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%  
Interest Rate 9.80% 9.80% 9.80% 9.82% 9.80% 9.82%  
Cash interest rate 9.05% 9.05% 9.05% 9.07% 9.05% 9.07%  
PIK interest rate 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%  
Acquisition Date   Jan. 22, 2025   Dec. 30, 2024      
Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029  
Principal/Share Amount $ 6,644 $ 6,644 $ 6,644 $ 6,648      
Investments, amortized cost 6,549 6,549 6,549 6,548      
Investments, fair value $ 6,558 $ 6,558 $ 6,558 $ 6,548      
Percent of net assets       2.30%   2.30%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Investment, Identifier [Axis]: Transervice Holdings, Inc. (d/b/a Transervice Logistics, Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:TranserviceHoldingsIncMember   whfcl:TranserviceHoldingsIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%  
Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%  
Acquisition Date   Jun. 29, 2023   Jun. 29, 2023      
Maturity Date Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028  
Principal/Share Amount $ 8,606 $ 8,606 $ 8,606 $ 8,663      
Investments, amortized cost 8,439 8,439 8,439 8,481      
Investments, fair value $ 8,628 $ 8,628 $ 8,628 $ 8,715      
Percent of net assets 3.10% 3.10% 3.10% 3.00% 3.10% 3.00%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:TrimliteBuyerLLCMember   whfcl:TrimliteBuyerLLCMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember Canadian Overnight Repo Rate Average whfcl:CanadianDollarOfferedRateMember Canadian Overnight Repo Rate Average  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.50% 5.50% 5.50% 6.50% 5.50% 6.50%  
Interest Rate 8.48% 8.48% 8.48% 9.99% 8.48% 9.99%  
Acquisition Date   Jul. 27, 2021   Jul. 27, 2021      
Maturity Date Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027  
Principal/Share Amount         $ 18,984 $ 18,984  
Investments, amortized cost $ 15,016 $ 15,016 $ 15,016 $ 15,006      
Investments, fair value $ 13,170 $ 13,170 $ 13,170 $ 13,206      
Percent of net assets 4.70% 4.70% 4.70% 4.60% 4.70% 4.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%  
Interest Rate 9.55% 9.55% 9.55% 9.83% 9.55% 9.83%  
Acquisition Date   Jun. 14, 2024   Jun. 14, 2024      
Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029  
Investments, fair value $ 19 $ 19 $ 19 $ 9      
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%  
Interest Rate 9.55% 9.55% 9.55% 9.83% 9.55% 9.83%  
Acquisition Date   Jun. 14, 2024   Jun. 14, 2024      
Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029  
Investments, fair value $ 12 $ 12 $ 12 $ 12      
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%  
Interest Rate 9.55% 9.55% 9.55% 9.83% 9.55% 9.83%  
Acquisition Date   Jun. 14, 2024   Jun. 14, 2024      
Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029  
Principal/Share Amount $ 5,336 $ 5,336 $ 5,336 $ 5,349      
Investments, amortized cost 5,247 5,247 5,247 5,254      
Investments, fair value $ 5,365 $ 5,365 $ 5,365 $ 5,338      
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TurnberrySolutionsInc.Member   whfcl:TurnberrySolutionsInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 5.75% 6.00% 5.75%  
Interest Rate 10.42% 10.42% 10.42% 10.21% 10.42% 10.21%  
Acquisition Date   Aug. 10, 2021   Aug. 10, 2021      
Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026  
Investments, fair value $ 4 $ 4 $ 4 $ 4      
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TurnberrySolutionsInc.Member   whfcl:TurnberrySolutionsInc.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 5.75% 6.00% 5.75%  
Interest Rate 10.42% 10.42% 10.42% 10.21% 10.42% 10.21%  
Acquisition Date   Aug. 10, 2021   Aug. 10, 2021      
Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026  
Principal/Share Amount $ 5,949 $ 5,949 $ 5,949 $ 5,964      
Investments, amortized cost 5,915 5,915 5,915 5,924      
Investments, fair value $ 5,949 $ 5,949 $ 5,949 $ 5,964      
Investment, Identifier [Axis]: Twin Ridge CRS, LP (d/b/a CRS OneSource) Class A Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:TwinRidgeCrsLpMember   whfcl:TwinRidgeCrsLpMember      
Investment, Type [Extensible Enumeration] whfcl:ClassCommonUnitsMember whfcl:ClassCommonUnitsMember whfcl:ClassCommonUnitsMember us-gaap:CommonClassAMember whfcl:ClassCommonUnitsMember us-gaap:CommonClassAMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors  
Acquisition Date   May 10, 2024   May 10, 2024      
Investment owned shares | shares 63,000 63,000 63,000 63 63,000 63  
Investments, amortized cost $ 317 $ 317 $ 317 $ 317      
Investments, fair value $ 331 $ 331 $ 331 $ 350      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: UserZoom Technologies, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:UserzoomTechnologiesIncMember   whfcl:NavigaIncMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%  
Interest Rate 11.80% 11.80% 11.80% 12.75% 11.80% 12.75%  
Acquisition Date   Jan. 12, 2023   Jan. 12, 2023      
Maturity Date Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029  
Principal/Share Amount $ 9,819 $ 9,819 $ 9,819 $ 9,819      
Investments, amortized cost 9,629 9,629 9,629 9,618      
Investments, fair value $ 9,781 $ 9,781 $ 9,781 $ 9,809      
Percent of net assets 3.50% 3.50% 3.50% 3.40% 3.50% 3.40%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Vistria Blocked MGT Investor, LP (d/b/a MGT Consulting Group) Series A Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:VistriaBlockedMgtInvestorLpMember   whfcl:VistriaBlockedMgtInvestorLpMember      
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:SeriesUnitsMember whfcl:ClassAUnitsMember whfcl:SeriesUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services  
Acquisition Date   Apr. 10, 2023   Apr. 10, 2023      
Investments, amortized cost $ 314 $ 314 $ 314 $ 314      
Investments, fair value $ 516 $ 516 $ 516 $ 493      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   W Electric Intermediate Holdings, LLC [Member]   W Electric Intermediate Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.82% 10.82% 10.82% 10.86% 10.82% 10.86%  
Cash interest rate 9.82% 9.82% 9.82% 9.86% 9.82% 9.86%  
PIK interest rate 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Acquisition Date   Aug. 15, 2024   Aug. 15, 2024      
Maturity Date Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029  
Investments, fair value $ 15 $ 15 $ 15 $ 9      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   W Electric Intermediate Holdings, LLC [Member]   W Electric Intermediate Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.82% 10.82% 10.82% 10.86% 10.82% 10.86%  
Cash interest rate 9.82% 9.82% 9.82% 9.86% 9.82% 9.86%  
PIK interest rate 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Acquisition Date   Aug. 15, 2024   Aug. 15, 2024      
Maturity Date Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029  
Principal/Share Amount $ 12,322 $ 12,322 $ 12,322 $ 12,322      
Investments, amortized cost 12,135 12,135 12,135 12,124      
Investments, fair value $ 12,289 $ 12,289 $ 12,289 $ 12,216      
Percent of net assets 4.40% 4.40% 4.40% 4.30% 4.40% 4.30%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: WCHG Buyer, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments    
Investment, Issuer Name [Extensible Enumeration]   whfcl:WchgBuyerInc.Member          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Commodity Chemicals Commodity Chemicals Commodity Chemicals   Commodity Chemicals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Floor 1.00% 1.00% 1.00%   1.00%    
Spread Above Index 5.00% 5.00% 5.00%   5.00%    
Interest Rate 9.30% 9.30% 9.30%   9.30%    
Acquisition Date   Feb. 06, 2025          
Maturity Date Apr. 10, 2031 Apr. 10, 2031 Apr. 10, 2031   Apr. 10, 2031    
Principal/Share Amount $ 7,000 $ 7,000 $ 7,000        
Investments, amortized cost 6,966 6,966 6,966        
Investments, fair value $ 6,966 $ 6,966 $ 6,966        
Percent of net assets 2.50% 2.50% 2.50%   2.50%    
Investment, Restriction Status [true false] true true true   true    
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false   false    
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember      
Investment, Type [Extensible Enumeration] Equity Investments Equity Investments Equity Investments Equity Investments Equity Investments Equity Investments  
Investments, fair value $ 22,299 $ 22,299 $ 22,299 $ 22,741     22,782
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments us-gaap:InvestmentAffiliatedIssuerMember Controlled affiliate company investments us-gaap:InvestmentAffiliatedIssuerMember  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WHFSTRSOhioSeniorLoanFundMember   whfcl:WHFSTRSOhioSeniorLoanFundMember      
Investment, Type [Extensible Enumeration] whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance Specialized Finance Specialized Finance Specialized Finance Specialized Finance Specialized Finance  
Acquisition Date   Jul. 19, 2019   Jul. 19, 2019      
Investment owned shares | shares 21,104,000 21,104,000 21,104,000 21,104 21,104,000 21,104  
Investments, amortized cost $ 21,104 $ 21,104 $ 21,104 $ 21,104      
Investments, fair value $ 22,299 $ 22,299 $ 22,299 $ 22,741      
Percent of net assets 7.90% 7.90% 7.90% 7.90% 7.90% 7.90%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments us-gaap:InvestmentAffiliatedIssuerMember Controlled affiliate company investments us-gaap:InvestmentAffiliatedIssuerMember  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember      
Investment, Type [Extensible Enumeration] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Specialized Finance Specialized Finance Specialized Finance Specialized Finance Specialized Finance Specialized Finance  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.82% 10.82% 10.82% 10.83% 10.82% 10.83%  
Acquisition Date   Jul. 19, 2019   Jul. 19, 2019      
Principal/Share Amount $ 84,416 $ 84,416 $ 84,416 $ 84,416      
Investments, amortized cost 84,416 84,416 84,416 84,416      
Investments, fair value $ 84,416 $ 84,416 $ 84,416 $ 84,416     $ 84,416
Percent of net assets 30.00% 30.00% 30.00% 29.50% 30.00% 29.50%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.55% 10.55% 10.55% 10.58% 10.55% 10.58%  
Acquisition Date   Aug. 01, 2024   Aug. 01, 2024      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investments, fair value $ (11) $ (11) $ (11) $ 2      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.55% 10.55% 10.55% 10.58% 10.55% 10.58%  
Acquisition Date   Aug. 01, 2024   Aug. 01, 2024      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Principal/Share Amount $ 258 $ 258 $ 258 $ 258      
Investments, amortized cost 253 253 253 253      
Investments, fair value $ 253 $ 253 $ 253 $ 254      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true   true    
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%  
Interest Rate 10.55% 10.55% 10.55% 10.58% 10.55% 10.58%  
Acquisition Date   Aug. 01, 2024   Aug. 01, 2024      
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Principal/Share Amount $ 7,669 $ 7,669 $ 7,669 $ 7,689      
Investments, amortized cost 7,536 7,536 7,536 7,548      
Investments, fair value $ 7,538 $ 7,538 $ 7,538 $ 7,555      
Percent of net assets 2.70% 2.70% 2.70% 2.60% 2.70% 2.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: What If Media Group, LLC Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WhatIfMediaGroupLLCMember   whfcl:WhatIfMediaGroupLLCMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services  
Acquisition Date   Jul. 02, 2021   Jul. 02, 2021      
Investment owned shares | shares 3,081,000 3,081,000 3,081,000 3,081 3,081,000 3,081  
Investments, amortized cost $ 851 $ 851 $ 851 $ 851      
Investments, fair value $ 1,762 $ 1,762 $ 1,762 $ 1,756      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false true false true  
Investment, Identifier [Axis]: Whitestone Home Furnishings, LLC (d/b/a Saatva, Inc.) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:WhitestoneHomeFurnishingsLlcMember   whfcl:WhitestoneHomeFurnishingsLlcMember      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Home Furnishings Home Furnishings Home Furnishings Home Furnishings Home Furnishings Home Furnishings  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%  
Interest Rate 10.32% 10.32% 10.32% 10.46% 10.32% 10.46%  
Acquisition Date   Nov. 06, 2023   Nov. 06, 2023      
Maturity Date Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026  
Principal/Share Amount $ 2,915 $ 2,915 $ 2,915 $ 2,930      
Investments, amortized cost 2,879 2,879 2,879 2,887      
Investments, fair value $ 2,926 $ 2,926 $ 2,926 $ 2,930      
Percent of net assets 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ZephyrBuyerL.p.Member   whfcl:ZephyrBuyerL.p.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.80% 10.80% 10.80% 10.83% 10.80% 10.83%  
Acquisition Date   Jan. 31, 2024   Jan. 31, 2024      
Maturity Date Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030  
Investments, fair value $ 36 $ 36 $ 36 $ 48      
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]   whfcl:ZephyrBuyerL.p.Member   whfcl:ZephyrBuyerL.p.Member      
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services Interactive Media & Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember  
Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%  
Interest Rate 10.80% 10.80% 10.80% 10.83% 10.80% 10.83%  
Acquisition Date   Jan. 31, 2024   Jan. 31, 2024      
Maturity Date Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030  
Principal/Share Amount $ 14,052 $ 14,052 $ 14,052 $ 14,087      
Investments, amortized cost 13,769 13,769 13,769 13,789      
Investments, fair value $ 14,192 $ 14,192 $ 14,192 $ 14,166      
Percent of net assets 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Investment, Restriction Status [true false] true true true true true true  
Investment, Significant Unobservable Input [true false] true true true true true true  
Investment, Non-income Producing [true false] false false false false false false  
Morgan Stanley              
Schedule of Investments [Line Items]              
Unrealized appreciation       $ 20      
Morgan Stanley | CAD              
Schedule of Investments [Line Items]              
Currency to be sold       796      
Unrealized appreciation       $ 20      
Morgan Stanley | USD              
Schedule of Investments [Line Items]              
Currency to be purchased       574      
Prime Rate [Member]              
Schedule of Investments [Line Items]              
Interest Rate 7.50% 7.50% 7.50%   7.50%    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]              
Schedule of Investments [Line Items]              
Rate of interest on investment per duration period 4.30% 4.30% 4.20%        
Canadian Overnight Repo Rate Average              
Schedule of Investments [Line Items]              
Interest Rate 2.80% 2.80% 2.80%   2.80%    
Advertising              
Schedule of Investments [Line Items]              
Investments, amortized cost $ 18,467 $ 18,467 $ 18,467 $ 11,937      
Investments, fair value 18,567 18,567 18,567 12,035      
Air Freight & Logistics              
Schedule of Investments [Line Items]              
Investments, amortized cost 3,281 3,281 3,281 3,286      
Investments, fair value 3,303 3,303 3,303 3,311      
Broadline Retail              
Schedule of Investments [Line Items]              
Investments, amortized cost 18,595 18,595 18,595 18,577      
Investments, fair value 17,831 17,831 17,831 17,827      
Building Products              
Schedule of Investments [Line Items]              
Investments, amortized cost 13,416 13,416 13,416 13,445      
Investments, fair value 13,372 13,372 13,372 13,437      
Human Resource & Employment Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 2,496 2,496 2,496        
Investments, fair value 2,496 2,496 2,496        
Construction & Engineering              
Schedule of Investments [Line Items]              
Investments, amortized cost 15,887 15,887 15,887 16,016      
Investments, fair value 16,113 16,113 16,113 16,253      
Data Processing & Outsourced Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 14,135 14,135 14,135 14,234      
Investments, fair value 12,704 12,704 12,704 12,885      
Distributors              
Schedule of Investments [Line Items]              
Investments, amortized cost 9,310 9,310 9,310 9,307      
Investments, fair value 9,368 9,368 9,368 9,372      
Diversified Support Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 18,744 18,744 18,744 19,107      
Investments, fair value 18,810 18,810 18,810 19,282      
Environmental & Facilities Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 29,489 29,489 29,489 29,529      
Investments, fair value 29,818 29,818 29,818 29,963      
Food Distributors              
Schedule of Investments [Line Items]              
Investments, amortized cost 4,911 4,911 4,911 4,919      
Investments, fair value 4,981 4,981 4,981 4,993      
Health Care Facilities              
Schedule of Investments [Line Items]              
Investments, amortized cost 8,199 8,199 8,199 7,944      
Investments, fair value 8,330 8,330 8,330 8,004      
Health Care Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 4,891 4,891 4,891 4,898      
Investments, fair value 5,049 5,049 5,049 4,995      
Health Care Supplies              
Schedule of Investments [Line Items]              
Investments, amortized cost 4,871 4,871 4,871 7,461      
Investments, fair value 4,972 4,972 4,972 7,696      
Household Appliances              
Schedule of Investments [Line Items]              
Investments, amortized cost 7,659 7,659 7,659 7,649      
Investments, fair value 7,925 7,925 7,925 7,632      
IT Consulting And Other Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 32,938 32,938 32,938 32,427      
Investments, fair value 33,270 33,270 33,270 32,720      
Packaged Foods & Meats              
Schedule of Investments [Line Items]              
Investments, amortized cost 6,988 6,988 6,988 6,939      
Investments, fair value 7,068 7,068 7,068 7,009      
Personal Products              
Schedule of Investments [Line Items]              
Investments, amortized cost 3,872 3,872 3,872        
Investments, fair value 3,872 3,872 3,872        
Paper & Plastic Packaging Products & Materials              
Schedule of Investments [Line Items]              
Investments, amortized cost 14,897 14,897 14,897 14,964      
Investments, fair value 14,839 14,839 14,839 14,881      
Research & Consulting Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 11,958 11,958 11,958 11,900      
Investments, fair value 12,027 12,027 12,027 11,977      
Technology Hardware, Storage & Peripherals              
Schedule of Investments [Line Items]              
Investments, amortized cost 17,847 17,847 17,847 17,880      
Investments, fair value 17,986 17,986 17,986 17,949      
Wireless Telecommunication Services              
Schedule of Investments [Line Items]              
Investments, amortized cost 6,246 6,246 6,246 6,256      
Investments, fair value 6,314 6,314 6,314 $ 6,332      
Debt Investments              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       us-gaap:InvestmentAffiliatedIssuerMember, Non-controlled/non-affiliate company investments   us-gaap:InvestmentAffiliatedIssuerMember, Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 642,925 642,925 642,925 $ 631,941      
Investments, fair value $ 605,623 $ 605,623 $ 605,623 $ 596,626      
Percent of net assets 215.30% 215.30% 215.30% 208.40% 215.30% 208.40%  
Debt Investments | Advertising              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 1,192 $ 1,192 $ 1,192 $ 16,365      
Investments, fair value $ 1,212 $ 1,212 $ 1,212 $ 16,862      
Percent of net assets 0.40% 0.40% 0.40% 6.00% 0.40% 6.00%  
Debt Investments | Air Freight & Logistics              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 29,720 $ 29,720 $ 29,720 $ 29,360      
Investments, fair value $ 29,076 $ 29,076 $ 29,076 $ 28,518      
Percent of net assets 10.20% 10.20% 10.20% 9.90% 10.20% 9.90%  
Debt Investments | Application Software              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 36,202 $ 36,202 $ 36,202 $ 36,508      
Investments, fair value $ 26,439 $ 26,439 $ 26,439 $ 26,924      
Percent of net assets 9.40% 9.40% 9.40% 9.40% 9.40% 9.40%  
Debt Investments | Broadcasting              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 7,486 $ 7,486 $ 7,486 $ 7,808      
Investments, fair value $ 7,516 $ 7,516 $ 7,516 $ 7,833      
Percent of net assets 2.70% 2.70% 2.70% 2.70% 2.70% 2.70%  
Debt Investments | Broadline Retail              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 4,063 $ 4,063 $ 4,063 $ 4,556      
Investments, fair value $ 4,080 $ 4,080 $ 4,080 $ 4,580      
Percent of net assets 1.40% 1.40% 1.40% 1.60% 1.40% 1.60%  
Debt Investments | Building Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 24,329 $ 24,329 $ 24,329 $ 15,006      
Investments, fair value $ 22,483 $ 22,483 $ 22,483 $ 13,206      
Percent of net assets 8.00% 8.00% 8.00% 4.60% 8.00% 4.60%  
Debt Investments | Commodity Chemicals              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 22,725 $ 22,725 $ 22,725 $ 15,765      
Investments, fair value $ 22,951 $ 22,951 $ 22,951 $ 16,026      
Percent of net assets 8.20% 8.20% 8.20% 5.60% 8.20% 5.60%  
Debt Investments | Human Resource & Employment Services              
Schedule of Investments [Line Items]              
Investments, amortized cost $ 2,912 $ 2,912 $ 2,912        
Investments, fair value $ 2,912 $ 2,912 $ 2,912        
Percent of net assets 1.00% 1.00% 1.00%   1.00%    
Debt Investments | Construction & Engineering              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 11,600 $ 11,600 $ 11,600 $ 3,539      
Investments, fair value $ 11,592 $ 11,592 $ 11,592 $ 3,539      
Percent of net assets 4.20% 4.20% 4.20% 1.20% 4.20% 1.20%  
Debt Investments | Construction Materials              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 6,361 $ 6,361 $ 6,361 $ 6,320      
Investments, fair value $ 5,668 $ 5,668 $ 5,668 $ 5,640      
Percent of net assets 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%  
Debt Investments | Data Processing & Outsourced Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 27,843 $ 27,843 $ 27,843 $ 28,409      
Investments, fair value $ 27,986 $ 27,986 $ 27,986 $ 28,572      
Percent of net assets 9.90% 9.90% 9.90% 10.00% 9.90% 10.00%  
Debt Investments | Distributors              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 10,456 $ 10,456 $ 10,456 $ 10,563      
Investments, fair value $ 10,563 $ 10,563 $ 10,563 $ 10,690      
Percent of net assets 3.70% 3.70% 3.70% 3.70% 3.70% 3.70%  
Debt Investments | Diversified Chemicals              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 3,442 $ 3,442 $ 3,442 $ 3,342      
Investments, fair value $ 3,442 $ 3,442 $ 3,442 $ 3,342      
Percent of net assets 1.20% 1.20% 1.20% 1.20% 1.20% 1.20%  
Debt Investments | Diversified Support Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 9,680 $ 9,680 $ 9,680 $ 9,559      
Investments, fair value $ 9,571 $ 9,571 $ 9,571 $ 9,414      
Percent of net assets 3.40% 3.40% 3.40% 3.30% 3.40% 3.30%  
Debt Investments | Education Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 22,514 $ 22,514 $ 22,514 $ 22,584      
Investments, fair value $ 20,791 $ 20,791 $ 20,791 $ 21,214      
Percent of net assets 7.40% 7.40% 7.40% 7.40% 7.40% 7.40%  
Debt Investments | Electric Utilities              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 15,823 $ 15,823 $ 15,823 $ 15,802      
Investments, fair value $ 16,042 $ 16,042 $ 16,042 $ 16,032      
Percent of net assets 5.70% 5.70% 5.70% 5.60% 5.70% 5.60%  
Debt Investments | Health Care Facilities              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 8,564 $ 8,564 $ 8,564 $ 8,694      
Investments, fair value $ 8,573 $ 8,573 $ 8,573 $ 8,660      
Percent of net assets 3.10% 3.10% 3.10% 3.00% 3.10% 3.00%  
Debt Investments | Health Care Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 19,536 $ 19,536 $ 19,536 $ 19,577      
Investments, fair value $ 19,539 $ 19,539 $ 19,539 $ 19,589      
Percent of net assets 7.00% 7.00% 7.00% 6.90% 7.00% 6.90%  
Debt Investments | Health Care Supplies              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 20,163 $ 20,163 $ 20,163 $ 20,142      
Investments, fair value $ 19,163 $ 19,163 $ 19,163 $ 19,535      
Percent of net assets 6.80% 6.80% 6.80% 6.80% 6.80% 6.80%  
Debt Investments | Health Care Technology              
Schedule of Investments [Line Items]              
Investments, amortized cost $ 4,158 $ 4,158 $ 4,158        
Investments, fair value $ 4,158 $ 4,158 $ 4,158        
Percent of net assets 1.50% 1.50% 1.50%   1.50%    
Debt Investments | Heavy Electrical Equipment              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 9,555 $ 9,555 $ 9,555 $ 9,971      
Investments, fair value $ 9,704 $ 9,704 $ 9,704 $ 10,138      
Percent of net assets 3.50% 3.50% 3.50% 3.60% 3.50% 3.60%  
Debt Investments | Home Furnishings              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 25,162 $ 25,162 $ 25,162 $ 25,288      
Investments, fair value $ 25,237 $ 25,237 $ 25,237 $ 25,376      
Percent of net assets 8.90% 8.90% 8.90% 8.80% 8.90% 8.80%  
Debt Investments | Household Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 11,685 $ 11,685 $ 11,685 $ 12,104      
Investments, fair value $ 10,989 $ 10,989 $ 10,989 $ 11,656      
Percent of net assets 3.90% 3.90% 3.90% 4.10% 3.90% 4.10%  
Debt Investments | Household Appliances              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 20,517 $ 20,517 $ 20,517 $ 22,326      
Investments, fair value $ 19,409 $ 19,409 $ 19,409 $ 21,255      
Percent of net assets 6.80% 6.80% 6.80% 7.40% 6.80% 7.40%  
Debt Investments | Industrial Machinery & Supplies & Components              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 12,135 $ 12,135 $ 12,135 $ 12,124      
Investments, fair value $ 12,304 $ 12,304 $ 12,304 $ 12,225      
Percent of net assets 4.40% 4.40% 4.40% 4.30% 4.40% 4.30%  
Debt Investments | Integrated Telecommunication Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Name [Extensible Enumeration]       whfcl:PatagoniaHoldcoLLCMember      
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Integrated Telecommunication Services   Integrated Telecommunication Services  
Investments, amortized cost $ 12,661 $ 12,661 $ 12,661 $ 12,602      
Investments, fair value $ 13,104 $ 13,104 $ 13,104 $ 13,135      
Percent of net assets 4.70% 4.70% 4.70% 4.60% 4.70% 4.60%  
Investment, Restriction Status [true false]       true   true  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Debt Investments | Interactive Media & Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 13,769 $ 13,769 $ 13,769 $ 13,789      
Investments, fair value $ 14,228 $ 14,228 $ 14,228 $ 14,214      
Percent of net assets 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%  
Debt Investments | Leisure Facilities              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       IT Consulting And Other Services   IT Consulting And Other Services  
Investments, amortized cost $ 19,978 $ 19,978 $ 19,978 $ 19,133      
Investments, fair value $ 20,369 $ 20,369 $ 20,369 $ 19,337      
Percent of net assets 7.30% 7.30% 7.30% 6.80% 7.30% 6.80%  
Debt Investments | Leisure Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Leisure Products   Leisure Products  
Investments, amortized cost $ 46,549 $ 46,549 $ 46,549 $ 45,674      
Investments, fair value $ 23,451 $ 23,451 $ 23,451 $ 23,298      
Percent of net assets 8.40% 8.40% 8.40% 8.10% 8.40% 8.10%  
Investment, Significant Unobservable Input [true false]       true   true  
Investment, Non-income Producing [true false]       false   false  
Debt Investments | Life Sciences Tools & Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost       $ 4,953      
Investments, fair value       $ 5,000      
Percent of net assets       1.70%   1.70%  
Debt Investments | Packaged Foods & Meats              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 4,072 $ 4,072 $ 4,072 $ 4,024      
Investments, fair value $ 4,138 $ 4,138 $ 4,138 $ 4,087      
Percent of net assets 1.40% 1.40% 1.40% 1.40% 1.40% 1.40%  
Debt Investments | Paper Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 9,144 $ 9,144 $ 9,144 $ 9,119      
Investments, fair value $ 9,450 $ 9,450 $ 9,450 $ 9,453      
Percent of net assets 3.40% 3.40% 3.40% 3.30% 3.40% 3.30%  
Debt Investments | Real Estate Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Real Estate Services   Real Estate Services  
Investments, amortized cost $ 20,978 $ 20,978 $ 20,978 $ 21,016      
Investments, fair value $ 20,499 $ 20,499 $ 20,499 $ 20,710      
Percent of net assets 7.40% 7.40% 7.40% 7.30% 7.40% 7.30%  
Investment, Restriction Status [true false]       true   true  
Debt Investments | Research & Consulting Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Specialized Consumer Services   Specialized Consumer Services  
Investments, amortized cost $ 4,815 $ 4,815 $ 4,815 $ 4,823      
Investments, fair value $ 4,917 $ 4,917 $ 4,917 $ 4,927      
Percent of net assets 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%  
Debt Investments | Specialized Consumer Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 6,625 $ 6,625 $ 6,625 $ 6,629      
Investments, fair value $ 6,727 $ 6,727 $ 6,727 $ 6,748      
Percent of net assets 2.40% 2.40% 2.40% 2.40% 2.40% 2.40%  
Debt Investments | Security & Alarm Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 6,849 $ 6,849 $ 6,849 $ 6,857      
Investments, fair value $ 7,052 $ 7,052 $ 7,052 $ 7,070      
Percent of net assets 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%  
Debt Investments | Specialized Finance              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 84,416 $ 84,416 $ 84,416 $ 84,416      
Investments, fair value $ 84,416 $ 84,416 $ 84,416 $ 84,416      
Percent of net assets 30.00% 30.00% 30.00% 29.50% 30.00% 29.50%  
Debt Investments | Systems Software              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 16,613 $ 16,613 $ 16,613 $ 16,573      
Investments, fair value $ 17,339 $ 17,339 $ 17,339 $ 17,267      
Percent of net assets 6.10% 6.10% 6.10% 5.90% 6.10% 5.90%  
Debt Investments | Technology Hardware, Storage & Peripherals              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]       Wireless Telecommunication Services   Wireless Telecommunication Services  
Investments, amortized cost $ 18,547 $ 18,547 $ 18,547 $ 18,547      
Investments, fair value $ 18,443 $ 18,443 $ 18,443 $ 18,072      
Percent of net assets 6.60% 6.60% 6.60% 6.30% 6.60% 6.30%  
Investment, Restriction Status [true false]       true   true  
Debt Investments | Transaction & Payment Processing Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 10,086 $ 10,086 $ 10,086 $ 8,074      
Investments, fair value $ 10,090 $ 10,090 $ 10,090 $ 8,066      
Percent of net assets 3.70% 3.70% 3.70% 2.80% 3.70% 2.80%  
Subordinated Debt [Member]              
Schedule of Investments [Line Items]              
Investments, amortized cost $ 1,180 $ 1,180 $ 1,180 $ 1,152      
Investments, fair value 1,202 1,202 1,202 $ 1,175      
Equity Investments              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       us-gaap:InvestmentAffiliatedIssuerMember, Non-controlled/non-affiliate company investments   us-gaap:InvestmentAffiliatedIssuerMember, Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 63,299 63,299 63,299 $ 63,299      
Investments, fair value $ 45,376 $ 45,376 $ 45,376 $ 45,587      
Percent of net assets 16.00% 16.00% 16.00% 16.00% 16.00% 16.00%  
Equity Investments | Advertising              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 297 $ 297 $ 297 $ 297      
Investments, fair value $ 559 $ 559 $ 559 $ 589      
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%  
Equity Investments | Air Freight & Logistics              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 1,250 $ 1,250 $ 1,250 $ 1,250      
Equity Investments | Broadline Retail              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 514 514 514 $ 514      
Investments, fair value $ 776 $ 776 $ 776 $ 756      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Equity Investments | Building Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 24 $ 24 $ 24 $ 24      
Equity Investments | Construction & Engineering              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 404 404 404 $ 404      
Investments, fair value $ 285 $ 285 $ 285 $ 388      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Equity Investments | Diversified Chemicals              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 4,537 $ 4,537 $ 4,537 $ 4,537      
Investments, fair value $ 2,222 $ 2,222 $ 2,222 $ 1,657      
Percent of net assets 0.80% 0.80% 0.80% 0.60% 0.80% 0.60%  
Equity Investments | Diversified Support Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 376 $ 376 $ 376 $ 376      
Investments, fair value $ 154 $ 154 $ 154 $ 149      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Equity Investments | Education Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 334 $ 334 $ 334 $ 334      
Investments, fair value 127 127 127 $ 100      
Equity Investments | Environmental & Facilities Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 942 942 942 $ 942      
Investments, fair value $ 1,434 $ 1,434 $ 1,434 $ 1,400      
Percent of net assets 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%  
Equity Investments | Food Distributors              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 317 $ 317 $ 317 $ 317      
Investments, fair value $ 331 $ 331 $ 331 $ 350      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Equity Investments | Household Appliances              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 1,100 $ 1,100 $ 1,100 $ 1,100      
Investments, fair value $ 970 $ 970 $ 970 $ 907      
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%  
Equity Investments | Industrial Machinery & Supplies & Components              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 788 $ 788 $ 788 $ 788      
Investments, fair value $ 1,012 $ 1,012 $ 1,012 $ 1,012      
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%  
Equity Investments | Interactive Media & Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 851 $ 851 $ 851 $ 851      
Investments, fair value $ 1,762 $ 1,762 $ 1,762 $ 1,756      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%  
Equity Investments | IT Consulting And Other Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 1,926 $ 1,926 $ 1,926 $ 1,926      
Investments, fair value $ 3,181 $ 3,181 $ 3,181 $ 3,504      
Percent of net assets 1.20% 1.20% 1.20% 1.30% 1.20% 1.30%  
Equity Investments | Leisure Facilities              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 2,734 $ 2,734 $ 2,734 $ 2,734      
Investments, fair value $ 396 $ 396 $ 396 $ 243      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Equity Investments | Leisure Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 4,060 $ 4,060 $ 4,060 $ 4,060      
Equity Investments | Paper & Plastic Packaging Products & Materials              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 400 400 400 $ 400      
Equity Investments | Real Estate Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 840 840 840 $ 840      
Investments, fair value 92 92 92 $ 162      
Percent of net assets       0.10%   0.10%  
Equity Investments | Research & Consulting Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost 333 333 333 $ 333      
Investments, fair value $ 346 $ 346 $ 346 $ 368      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Equity Investments | Specialized Consumer Services              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 600 $ 600 $ 600 $ 600      
Investments, fair value $ 309 $ 309 $ 309 $ 374      
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%  
Equity Investments | Specialized Finance              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 21,104 $ 21,104 $ 21,104 $ 21,104      
Investments, fair value $ 22,299 $ 22,299 $ 22,299 $ 22,741      
Percent of net assets 7.90% 7.90% 7.90% 7.90% 7.90% 7.90%  
Equity Investments | Systems Software              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]       Non-controlled/non-affiliate company investments   Non-controlled/non-affiliate company investments  
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember  
Investments, amortized cost $ 19,568 $ 19,568 $ 19,568 $ 19,568      
Investments, fair value $ 9,121 $ 9,121 $ 9,121 $ 9,131      
Percent of net assets 3.20% 3.20% 3.20% 3.20% 3.20% 3.20%  
Money Market Funds              
Schedule of Investments [Line Items]              
Percent of net assets 5.10% 5.10% 5.10% 4.60% 5.10% 4.60%  
Money Market Funds amortized cost $ 14,322 $ 14,322 $ 14,322 $ 13,249      
Money Market Fair Value $ 14,322 $ 14,322 $ 14,322 $ 13,249      
Goldman Sachs Money Market Fund (CUSIP: 38141W315)              
Schedule of Investments [Line Items]              
Percent of net assets 1.00% 1.00% 1.00% 0.30% 1.00% 0.30%  
Weighted average interest rate 4.19% 4.19% 4.19% 4.33% 4.19% 4.33%  
Money Market Funds amortized cost $ 2,879 $ 2,879 $ 2,879 $ 837      
Money Market Fair Value $ 2,879 $ 2,879 $ 2,879 $ 837      
Invesco Treasury Money Market Fund (CUSIP: X9USDINVE)              
Schedule of Investments [Line Items]              
Percent of net assets 4.10% 4.10% 4.10% 4.30% 4.10% 4.30%  
Weighted average interest rate 3.70% 3.70% 3.70% 3.83% 3.70% 3.83%  
Money Market Funds amortized cost $ 11,443 $ 11,443 $ 11,443 $ 12,412      
Money Market Fair Value 11,443 11,443 11,443 12,412      
Non-controlled/non-affiliate company investments              
Schedule of Investments [Line Items]              
Investments, fair value $ 512,787 $ 512,787 $ 512,787 $ 504,832      
v3.25.1
ORGANIZATION
 3 Months Ended
Mar. 31, 2025
ORGANIZATION  
ORGANIZATION

​

NOTE 1 - ORGANIZATION

WhiteHorse Finance, Inc. (“WhiteHorse Finance” and, together with its subsidiaries, the “Company”) is an externally managed, non-diversified, closed-end management investment company that has elected to be treated as a business development company under the 1940 Act. In addition, for tax purposes, WhiteHorse Finance elected to be treated as a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (the “Code”). WhiteHorse Finance’s common stock trades on the Nasdaq Global Select Market under the symbol “WHF”.

The Company’s investment objective is to generate attractive risk-adjusted returns primarily by originating and investing in senior secured loans, including first lien and second lien facilities, to performing lower middle market companies across a broad range of industries that typically are based on a floating interest rate such as SOFR plus a spread and typically have a term of three to six years. While the Company focuses principally on originating senior secured loans to lower middle market companies, it may also opportunistically make investments at other levels of a company’s capital structure, including mezzanine loans or equity interests and may receive warrants to purchase common stock in connection with its debt investments.

WhiteHorse Finance’s investment activities are managed by H.I.G. WhiteHorse Advisers, LLC (“WhiteHorse Advisers” or the “Investment Adviser”). H.I.G. WhiteHorse Administration, LLC (“WhiteHorse Administration” or the “Administrator”) provides administrative services necessary for the Company to operate.
v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 3 Months Ended
Mar. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of WhiteHorse Finance and its wholly owned subsidiaries, WhiteHorse Finance Credit I, LLC (“WhiteHorse Credit”), and its subsidiary WhiteHorse Finance (CA), LLC (“WhiteHorse California”), WHF American Craft Blocker, LLC, WhiteHorse RCKC Holdings, LLC, WhiteHorse Finance Holdings, LLC and WhiteHorse Finance CLO I, LLC. The Company meets the definition of an investment company under Accounting Standards Codification (“ASC”) Topic 946, Financial Services - Investment Companies, and therefore applies the accounting and reporting guidance discussed therein to its consolidated financial statements. The classifications included in the consolidated schedule of investments represent, in management’s opinion, as to the most meaningful presentation of the Company’s investment portfolio. All significant intercompany balances and transactions have been eliminated.

Additionally, the accompanying consolidated financial statements and related financial information have been prepared pursuant to the requirements for reporting on Form 10-Q and Articles 6, 10 and 12 of Regulation S-X. In the opinion of management, the consolidated financial statements reflect all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of financial results as of and for the periods presented.

Principles of Consolidation: Under the investment company rules and regulations pursuant to ASC Topic 946, WhiteHorse Finance is precluded from consolidating any entity other than another investment company. As provided under ASC Topic 946, WhiteHorse Finance generally consolidates any investment company when it owns 100% of its partners’ or members’ capital or equity units. The Company does not consolidate its investment in STRS JV or any of its controlled affiliate investments. See further description in Note 4.

Use of Estimates: The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the financial statements. Actual results could differ from those estimates.

Fair Value of Financial Instruments: The Company determines the fair value of its financial instruments in accordance with ASC Topic 820, Fair Value Measurements and Disclosures. ASC Topic 820 defines fair value,

establishes a framework used to measure fair value and requires disclosures for fair value measurements. In accordance with ASC Topic 820, the Company has categorized its financial instruments carried at fair value, based on the priority of the valuation technique, into a three-level fair value hierarchy. Fair value is a market-based measure considered from the perspective of the market participant who holds the financial instrument. Therefore, when market assumptions are not readily available, the Company’s own assumptions are set to reflect those that management believes market participants would use in pricing the financial instrument at the measurement date.

The Company values its investments in accordance with the 1940 Act and Rule 2a-5 thereunder, which sets forth the requirements for determining fair value in good faith. Pursuant to Rule 2a-5, the board of directors has designated the Investment Adviser to determine the fair value of the Company’s investments. The board of directors oversees the Investment Adviser’s performance of its valuation responsibilities, and in support of this oversight, the Investment Adviser provides periodic reports to the Company’s board of directors related to the fair valuation process. The Investment Adviser carries out its responsibilities as valuation designee primarily through its valuation committee (the “Valuation Committee”), assisted by third-party valuation firms, administrative personnel, and other service providers, as appropriate. The Valuation Committee consists of a number of representatives from different functions of the Investment Adviser. The Investment Adviser conducts the fair valuation process on a quarterly basis, subject to the oversight of the Company’s board of directors through the audit committee, using consistently applied valuation procedures. In accordance with the Company’s valuation procedures, the Investment Adviser performs periodic testing of the appropriateness and accuracy of fair value methodologies, and has established a process for approving, monitoring, and evaluating independent pricing service providers. Effective September 8, 2022, the board of directors designated the Investment Adviser as the Company’s valuation designee.

Investments that are not publicly traded or for which market prices are not readily available are valued based on the input of the Investment Adviser and independent third-party valuation firms engaged to review Company investments. These external reviews are used by the Company’s Investment Adviser, subject to the oversight of the board of directors, to review the Company’s internal valuation of investments during the year.

Investment Transactions: The Company records investment transactions on a trade date basis. These transactions may settle subsequent to the trade date depending on the transaction type. Certain expenses related to legal and tax consultation, due diligence, rating fees, valuation expenses and independent collateral appraisals may arise when the Company makes certain investments. These expenses are recognized in the consolidated statements of operations as they are incurred.

Foreign currency translation: The Company’s books and records are maintained in U.S. dollars. Any foreign currency amounts are translated into U.S. dollars on the following basis:

(1)cash and cash equivalents, restricted cash and cash equivalents, fair value of investments, interest receivable, and other assets and liabilities — at the spot exchange rate on the last business day of the period; and
(2)purchases and sales of investments, income and expenses — at the exchange rates prevailing on the respective dates of such transactions.

Although net assets and fair values are presented based on the applicable foreign exchange rates described above, the Company does not isolate that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in fair values of investments held. Such fluctuations are included with the net realized and unrealized gain or loss from investments. Fluctuations arising from the translation of assets other than investments and liabilities are included with the net change in unrealized appreciation (depreciation) on translation of assets and liabilities in foreign currencies on the consolidated statements of operations.

Foreign security and currency transactions may involve certain considerations and risks not typically associated with investing in U.S. companies. These risks include, but are not limited to, currency fluctuations and revaluations and future adverse political, social and economic developments, which could cause investments in foreign markets to be less liquid and prices to be more volatile than those of comparable U.S. companies or U.S. government securities.

Revenue Recognition: The Company’s revenue recognition policies are as follows:

Sales: Realized gains or losses on the sales of investments are calculated by using the specific identification method.

Investment Income: Interest income, adjusted for amortization of premium and accretion of discount, is recorded on an accrual basis. The Company may also receive closing, commitment, prepayment, amendment and other fees from portfolio companies in the ordinary course of business.

Dividend income is recorded on the record date for private portfolio companies or on the ex-dividend date for publicly traded portfolio companies.

Closing fees associated with investments in portfolio companies are deferred and recognized as interest income over the respective terms of the applicable loans. Upon the prepayment of a loan or debt security, any unamortized loan closing fees are recorded as part of interest income. Commitment fees are based upon the undrawn portion committed by the Company and are recorded as interest income on an accrual basis. Prepayment, amendment and other fees are recognized when earned, generally when such fees are receivable, and are included in fee income on the consolidated statements of operations.

The Company may invest in loans that contain a PIK interest rate provision. PIK interest is accrued at the contractual rates and added to loan principal on the reset dates to the extent such amounts are expected to be collected.

Non-accrual loans: Loans are placed on non-accrual status when principal or interest payments are past due 30 days or more or when there is reasonable doubt that principal or interest will be collected. The Company may conclude that non-accrual status is not required if the loan has sufficient collateral value and is in the process of collection. Accrued interest is generally reversed when a loan is placed on non-accrual status. Interest payments received on non-accrual loans may be recognized as income or applied to principal depending upon management’s judgment. Non-accrual loans are restored to accrual status when past due principal and interest is paid and, in management’s judgment, are likely to remain current.

Cash and Cash Equivalents: Cash and cash equivalents include cash, deposits with financial institutions, and short-term liquid investments in money market funds with original maturities of three months or less.

Restricted Cash and Cash Equivalents: Restricted cash and cash equivalents include amounts that are collected and held by the Administrative Agent (as defined in Note 6) appointed as custodian of the assets securing the Credit Facility (as defined in Note 6). Restricted cash is held by the trustee for the payment of interest expense and principal on the outstanding borrowings or reinvestment into new assets. Restricted cash that represents interest or fee income is transferred to unrestricted cash accounts by the trustee generally once a quarter after the payment of operating expenses and amounts due under the Credit Facility.

Offering Costs: The Company may incur legal, accounting, regulatory, investment banking and other costs in relation to equity offerings. Offering costs are deferred and charged against paid-in capital in excess of par on completion of the related offering.

Deferred Financing Costs: Deferred financing costs represent fees and other direct incremental costs incurred in connection with the Company’s borrowings. These amounts are amortized and are included in interest expense in the consolidated statements of operations over the estimated life of the borrowings. Deferred financing costs are presented in the consolidated statements of assets and liabilities as a direct reduction from the carrying amount of the related debt liability.

​

Income Taxes: The Company elected to be treated as a RIC under Subchapter M of the Code. In order to maintain its status as a RIC, among other requirements, the Company is required to distribute dividends for U.S. federal income tax purposes to its stockholders each taxable year generally of an amount at least equal to 90% of the sum of ordinary income and realized net short-term capital gains in excess of realized net long-term capital losses, if any, out of the assets legally available for distribution. In addition, the Company will incur a nondeductible excise tax equal to 4% of the amount by which (1) 98% of ordinary income for the calendar year (taking into account certain deferrals and elections), (2) 98.2% of capital gains in excess of capital losses, adjusted for certain ordinary losses, for the one-year period ending on October 31 of the calendar year and (3) any ordinary income and capital gain income for preceding years that were not distributed during such years and on which the Company incurred no U.S. federal income tax exceed distributions for the year. The Company accrues estimated excise tax on the amount, if any, that estimated taxable income is expected to exceed the level of stockholder distributions described above.

The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statement is the largest benefit or expense that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. Any tax positions not deemed to satisfy the more-likely-than-not threshold are reversed and recorded as tax benefit or tax expense, as appropriate, in the current year. Management has analyzed the Company’s tax positions, and the Company has concluded that the Company did not have any unrecognized tax benefits or unrecognized tax liabilities related to uncertain tax positions as of March 31, 2025 and December 31, 2024.

Penalties or interest that may be assessed related to any income taxes would be classified as general and administrative expenses on the consolidated statements of operations. The Company had no amounts accrued for interest or penalties as of March 31, 2025 or December 31, 2024. The Company does not expect the total amount of unrecognized tax benefits to significantly change in the next twelve months. The Company’s tax returns are subject to examination by federal, state and local taxing authorities. Because many types of transactions are susceptible to varying interpretations under U.S. federal and state income tax laws and regulations, the amounts reported in the accompanying consolidated financial statements may be subject to change at a later date by the respective taxing authorities. Tax returns for each of the federal tax years since 2021 remain subject to examination by the Internal Revenue Service.

As of March 31, 2025 and December 31, 2024, the cost of investments for federal income tax purposes was $753,288 and $711,668 resulting in net unrealized depreciation of $87,967 and $56,206, respectively. This is comprised of gross unrealized appreciation of $9,618 and $13,700 and gross unrealized depreciation of $97,585 and $69,906, on a tax basis, as of March 31, 2025 and December 31, 2024, respectively.

Dividends and Distributions: Dividends and distributions to common stockholders are recorded on the ex-dividend date. Quarterly distribution payments are determined by the Company’s board of directors and are paid from taxable earnings estimated by management and may include a return of capital and/or capital gains. Net realized capital gains, if any, are distributed at least annually, although the Company may decide to retain such capital gains for investment.

The Company maintains an “opt out” dividend reinvestment plan (“DRIP”) for common stockholders. As a result, if the Company declares a distribution or other dividend, stockholders’ cash distributions will be automatically reinvested in additional shares of common stock, unless they specifically “opt out” of the DRIP so as to receive cash distributions.

Earnings per Share: The Company calculates earnings per share as earnings available to stockholders divided by the weighted average number of shares outstanding during the period.

Risks and Uncertainties: In the normal course of business, the Company generally encounters two significant types of economic risks, including credit and market. Credit risk is the risk of default on the Company’s investments that result from an issuer’s, borrower’s or derivative counterparty’s inability or unwillingness to make contractually required payments. Market risk reflects changes in the value of investments due to changes in interest rates, spreads or other market factors, including the value of the collateral underlying investments held by the Company. Management believes

that the carrying value of the Company’s investments are fairly stated, taking into consideration these risks along with estimated collateral values, payment histories and other market information.

Reclassifications: Certain amounts in the consolidated financial statements have been reclassified. These reclassifications had no material impact on the Company’s consolidated financial position, results of operations or cash flows as previously reported.

Segment Reporting: In accordance with ASC Topic 280, Segment Reporting, or ASC 280, the Company has determined that it has a single operating and reporting segment. As a result, the Company’s segment accounting policies are the same as described herein and the Company does not have any intra-segment sales and transfers of assets.

​

Recent Accounting Pronouncements: In November 2024, the Financial Accounting Standards Board issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), which requires public business entities to disclose, in interim and annual reporting periods, additional information about certain expenses in the notes to financial statements. The objective of this guidance is to enhance transparency and comparability by providing more detailed disaggregation of expenses presented in the income statement. The guidance is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. The Company is currently evaluating the impact of the adoption of ASU 2024-03 on its consolidated financial statements.
v3.25.1
FORWARD CURRENCY CONTRACTS
 3 Months Ended
Mar. 31, 2025
FORWARD CURRENCY CONTRACTS  
FORWARD CURRENCY CONTRACTS

NOTE 3 - FORWARD CURRENCY CONTRACTS

The Company may enter into foreign currency forward contracts from time to time to facilitate settlement of purchases and sales of investments denominated in foreign currencies and to economically hedge the impact that an adverse change in foreign exchange rates would have on the value of the Company’s investments denominated in foreign currencies. A foreign currency forward contract is a commitment to purchase or sell a foreign currency at a future date at a negotiated forward rate. These contracts are marked-to-market by recognizing the difference between the contract forward exchange rate and the forward market exchange rate on the last day of the period presented as unrealized appreciation or depreciation. Realized gains or losses are recognized when forward contracts are settled. Risks arise as a result of the potential inability of the counterparties to meet the terms of their contracts. The Company attempts to limit counterparty risk by only dealing with well-known counterparties.

The Company utilizes forward foreign currency exchange contracts to protect itself against fluctuations in exchange rates. The Company may choose to renew contracts quarterly unless otherwise settled by the Company or the counterparty.

The following table provides a breakdown of our forward currency contracts for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31, 

($ in thousands)

​

​

2025

​

​

2024

Realized gain (loss) on forward currency contracts

​

$

22

​

$

(28)

Unrealized appreciation (depreciation) on forward currency contracts

​

​

(20)

​

​

52

Total net realized and unrealized gains (losses) on forward currency contracts

​

$

2

​

$

24

​

​

​

​

​

​

​

​

​

The value associated with unrealized gain or loss on open contracts is included in unrealized appreciation or depreciation on forward currency contracts within the consolidated statements of assets and liabilities. There were no open contracts as of March 31, 2025. Open contracts as of December 31, 2024 were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

796

CAD

​

$

574

USD

​

2/4/2025

​

$

20

​

$

—

Total

​

​

​

​

​

​

​

​

​

​

​

$

20

​

$

—

​

The following table is a summary of the average USD notional exposure to foreign currency forward contracts for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31,

​

Average USD notional outstanding

    

​

2025

​

​

2024

    

Forward currency contracts

​

$

247

​

$

1,105

​

​

The foreign currency forward contracts open at the end of the period are generally indicative of the volume of activity during the period. The value associated with unrealized gain or loss on open contracts is included in unrealized appreciation or depreciation on forward currency contracts within the consolidated statements of assets and liabilities.

Offsetting of Derivative Instruments

The Company has derivative instruments that are subject to master netting agreements. These agreements include provisions to offset positions with the same counterparty in the event of default by one of the parties. The Company’s unrealized appreciation or depreciation on derivative instruments are reported as gross assets and liabilities, respectively, in the consolidated statements of assets and liabilities. There were no open contracts as of March 31, 2025. The following table presents the Company’s assets and liabilities related to derivatives by counterparty, net of amounts available for offset under a master netting arrangement and net of any collateral received or pledged by the Company for such assets and liabilities as of December 31, 2024.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2024

Counterparty ($ in thousands)

    

Derivative Assets
Subject to Master
Netting Agreement

    

Derivative
Liabilities Subject
to Master Netting
Agreement

    

Derivatives
 Available for
Offset

    

Non-cash
Collateral
Received

    

Non-cash
Collateral
Pledged(1)

    

Cash Collateral
Received(1)

    

Cash Collateral
Pledged(1)

    

Net Amount of
Derivative
Assets(2)

    

Net Amount of
Derivative
Liabilities(3)

Morgan Stanley (CAD)

​

$

20

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

20

​

$

—

Total

​

$

20

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

20

​

$

—

(1)In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization.
(2)Net amount of derivative assets represents the net amount due from the counterparty to the Company in the event of default.
(3)Net amount of derivative liabilities represents the net amount due from the Company to the counterparty in the event of default.
v3.25.1
INVESTMENTS
 3 Months Ended
Mar. 31, 2025
INVESTMENTS  
INVESTMENTS

NOTE 4 - INVESTMENTS

Investments consisted of the following:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of March 31, 2025

​

As of December 31, 2024

​

    

Amortized Cost

    

Fair Value

    

Amortized Cost

    

Fair Value

First lien secured loans

​

$

553,887

​

$

516,563

​

$

538,078

​

$

502,693

Second lien secured loans

​

 

3,442

​

 

3,442

​

 

8,295

​

 

8,342

Unsecured loans

​

​

1,180

​

 

1,202

​

​

1,152

​

 

1,175

Subordinated Note to STRS JV

​

 

84,416

​

 

84,416

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

42,195

​

 

23,077

​

 

42,195

​

 

22,846

Equity in STRS JV

​

 

21,104

​

 

22,299

​

 

21,104

​

 

22,741

Total

​

$

706,224

​

$

650,999

​

$

695,240

​

$

642,213

​

​

The following table shows the portfolio composition by industry grouping at fair value:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Industry ($ in thousands)

​

As of March 31, 2025

​

As of December 31, 2024

​

Advertising

    

$

1,771

    

0.3

%  

$

17,451

    

3.3

%

Air Freight & Logistics

​

​

29,076

​

5.3

​

​

28,518

​

5.3

​

Application Software

​

​

26,439

​

4.9

​

​

26,924

​

5.0

​

Broadcasting

​

​

7,516

​

1.4

​

​

7,833

​

1.5

​

Broadline Retail

​

​

4,856

​

0.9

​

​

5,336

​

1.0

​

Building Products

​

​

22,483

​

4.1

​

​

13,206

​

2.5

​

Commodity Chemicals

​

​

22,951

​

4.2

​

​

16,026

​

3.0

​

Construction & Engineering

​

​

11,877

​

2.2

​

​

3,927

​

0.7

​

Construction Materials

​

​

5,668

​

1.0

​

​

5,640

​

1.1

​

Data Processing & Outsourced Services

​

​

27,986

​

5.1

​

​

28,572

​

5.3

​

Distributors

​

​

10,563

​

1.9

​

​

10,690

​

2.0

​

Diversified Chemicals

​

​

5,664

​

1.0

​

​

4,999

​

0.9

​

Diversified Support Services

​

​

9,725

​

1.8

​

​

9,563

​

1.8

​

Education Services

​

​

20,918

​

3.8

​

​

21,314

​

4.0

​

Electric Utilities

​

​

16,042

​

2.9

​

​

16,032

​

3.0

​

Environmental & Facilities Services

​

​

1,434

​

0.3

​

​

1,400

​

0.3

​

Food Distributors

​

​

331

​

0.1

​

​

350

​

0.1

​

Health Care Facilities

​

​

8,573

​

1.6

​

​

8,660

​

1.6

​

Health Care Services

​

​

19,539

​

3.6

​

​

19,589

​

3.7

​

Health Care Supplies

​

​

19,163

​

3.5

​

​

19,535

​

3.7

​

Health Care Technology

​

​

4,158

​

0.8

​

​

—

​

—

​

Heavy Electrical Equipment

​

​

9,704

​

1.8

​

​

10,138

​

1.9

​

Home Furnishings

​

​

25,237

​

4.6

​

​

25,376

​

4.7

​

Household Appliances

​

​

20,379

​

3.7

​

​

22,162

​

4.1

​

Household Products

​

​

10,989

​

2.0

​

​

11,656

​

2.2

​

Human Resource & Employment Services

​

​

2,912

​

0.5

​

​

—

​

—

​

Industrial Machinery & Supplies & Components

​

​

13,316

​

2.4

​

​

13,237

​

2.5

​

Integrated Telecommunication Services

​

​

13,104

​

2.4

​

​

13,135

​

2.5

​

Interactive Media & Services

​

​

15,990

​

2.9

​

​

15,970

​

3.0

​

IT Consulting & Other Services

​

​

3,181

​

0.6

​

​

3,504

​

0.6

​

Leisure Facilities

​

​

20,765

​

3.8

​

​

19,580

​

3.7

​

Leisure Products

​

​

23,451

​

4.3

​

​

23,298

​

4.4

​

Life Sciences Tools & Services

​

​

—

​

—

​

​

5,000

​

0.9

​

Packaged Foods & Meats

​

​

4,138

​

0.8

​

​

4,087

​

0.7

​

Paper Products

​

​

9,450

​

1.7

​

​

9,453

​

1.8

​

Real Estate Services

​

​

20,591

​

3.8

​

​

20,872

​

3.9

​

Research & Consulting Services

​

​

5,263

​

1.0

​

​

5,295

​

0.9

​

Security & Alarm Services

​

​

7,052

​

1.4

​

​

7,070

​

1.3

​

Specialized Consumer Services

​

​

7,036

​

1.4

​

​

7,122

​

1.3

​

Specialized Finance(1)

​

​

—

​

—

​

​

—

​

—

​

Systems Software

​

​

26,460

​

4.9

​

​

26,398

​

4.9

​

Technology Hardware, Storage & Peripherals

​

​

18,443

​

3.4

​

​

18,072

​

3.4

​

Transaction & Payment Processing Services

​

​

10,090

​

1.9

​

​

8,066

​

1.5

​

Total(1)

​

$

544,284

​

100.0

%

$

535,056

​

100.0

%

(1)Excludes investments in STRS JV.

​

As of March 31, 2025, the portfolio companies underlying the investments are all located in the United States and its territories, except for Arcserve Cayman Opco LP, Arcserve Cayman GP LLC, Arcserve Cayman Topco LP, and Alvaria Holdco (Cayman), which are domiciled in Cayman Islands and Trimlite Buyer, LLC, which is domiciled in Canada. As of March 31, 2025 and December 31, 2024, the weighted average remaining term of the Company’s debt investments, excluding non-accrual investments, was approximately 2.9 years and 3.0 years, respectively.

​

As of March 31, 2025 the total cost basis of non-accrual loans was $79,597, and the total fair value of non-accrual loans was $45,864. As of December 31, 2024 the total cost basis of non-accrual loans was $69,576 and the total fair value of non-accrual loans was $37,019.

​

An affiliated company is generally a portfolio company in which the Company owns 5% or more of its voting securities. A controlled affiliated company is generally a portfolio company in which the Company owns more than 25% of its voting securities or has the power to exercise control over its management or policies (including through a management agreement).

The following table presents the schedule of investments in and advances to affiliated and controlled persons (as defined by the 1940 Act) as of and for the three months ended March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends,

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

interest and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

Gross

​

Gross

​

Realized

​

Appreciation

​

March 31, 

Affiliated Person(1)

​

Asset

    

income

    

2024

    

Additions(2)

    

Reductions(3)

    

Gain (Loss)

    

(Depreciation)

    

2025

Non-controlled affiliates

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

First Lien Secured Delayed Draw Loan

​

$

29

​

$

1,247

​

$

24

​

$

—

​

$

—

​

$

(27)

​

$

1,244

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

Unsecured Loan

​

​

14

​

 

581

​

 

14

​

 

—

​

 

—

​

 

(1)

​

 

594

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

Unsecured Loan

​

​

14

​

 

594

​

 

15

​

 

—

​

 

—

​

 

(1)

​

 

608

Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC)

​

Common Units

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC)

​

Common Units

​

​

—

​

 

9,131

​

 

—

​

 

—

​

 

—

​

 

(10)

​

 

9,121

Camarillo Fitness Holdings, LLC (f/k/a Honors Holdings, LLC)

​

First Lien Secured Term Loan

​

​

(38)

​

 

10,492

​

 

(38)

​

 

—

​

 

—

​

 

288

​

 

10,742

Camarillo Fitness Holdings, LLC (f/k/a Honors Holdings, LLC)

​

First Lien Secured Delayed Draw Loan

​

​

—

​

 

—

​

 

811

​

 

—

​

 

—

​

 

(94)

​

 

717

H.I.G. Camarillo, L.P. (f/k/a Honors Holdings, LLC)

​

Limited Partner Interests

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Playmonster Group LLC

​

Priority First Lien Secured Term Loan

​

​

39

​

 

1,172

​

 

39

​

 

—

​

 

—

​

 

(5)

​

 

1,206

Playmonster Group LLC

​

First Lien Secured Term Loan

​

 

—

​

 

1,635

​

 

—

​

 

—

​

 

—

​

 

(34)

​

 

1,601

Playmonster Group Equity, Inc. (d/b/a PlayMonster)

​

Preferred Stock

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Playmonster Group Equity, Inc. (d/b/a PlayMonster)

​

Common Stock

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Chase Products Co. (f/k/a Starco)

​

Second Lien Secured Term Loan

​

​

100

​

 

3,342

​

 

100

​

 

—

​

 

—

​

 

—

​

 

3,442

Pressurized Holdings, LLC (f/k/a Starco)

​

Common Units

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Pressurized Holdings, LLC (f/k/a Starco)

​

Preferred Units

​

​

—

​

 

1,657

​

 

—

​

 

—

​

 

—

​

 

565

​

 

2,222

Total Non-controlled affiliates

​

​

​

$

158

​

$

29,851

​

$

965

​

$

—

​

$

—

​

$

681

​

$

31,497

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends,

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

interest and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

Gross

​

Gross

​

Realized

​

Appreciation

​

March 31, 

Affiliated Person(1)

​

Asset

    

income

    

2024

    

Additions(2)

    

Reductions(3)

    

Gain (Loss)

    

(Depreciation)

    

2025

Controlled affiliates

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

American Crafts, LC

​

Super Senior Priority First Lien Secured Term Loan

​

$

—

​

$

373

​

$

—

​

$

—

​

$

—

​

$

(373)

​

$

—

American Crafts, LC

​

Super Senior Priority First Lien Secured Term Loan

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

American Crafts, LC

​

Super Priority First Lien Secured Term Loan

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

American Crafts, LC

​

Priority First Lien Secured Term Loan

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

American Crafts, LC

​

First Lien Secured Term Loan

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

American Crafts, LC

​

First Lien Secured Delayed Draw Loan

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

American Crafts Holdings, LLC (d/b/a American Crafts, LC)

​

Warrants

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

New American Crafts Holdings, LLC (d/b/a American Crafts, LC)

​

Class A Units

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

WHF STRS Ohio Senior Loan Fund LLC*

 

Subordinated Note

​

​

2,284

​

​

84,416

​

​

—

​

​

—

​

​

—

​

​

—

​

​

84,416

WHF STRS Ohio Senior Loan Fund LLC*

 

Equity

​

 

1,382

​

 

22,741

​

 

—

​

 

—

​

 

—

​

 

(442)

​

 

22,299

Total Controlled affiliates

 

  

​

$

3,666

​

$

107,530

​

$

—

​

$

—

​

$

—

​

$

(815)

​

$

106,715

*

The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a limited liability company (“LLC”) in Delaware that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form LLC equity interests and interest-bearing subordinated notes as STRS JV makes investments, and all portfolio and other material decisions regarding STRS JV must be submitted to STRS JV’s board of managers which is comprised of an equal number of members appointed by each of the Company and STRS Ohio. Because management of STRS JV is shared equally between the Company and STRS Ohio, the Company does not believe it controls STRS JV for purposes of the 1940 Act or otherwise. This note shall be referred to hereinafter as Management of the STRS JV (“Management of the STRS JV”).

​

(1)Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company.
(2)Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK, an exchange of existing investments for new investments and the transfers of an existing portfolio company into this category from a different category.
(3)Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, an exchange of existing investments for new investments and the transfers of an existing portfolio company into this category from a different category.

​

​

​

​

The following table presents the schedule of investments in and advances to affiliated and controlled persons (as defined by the 1940 Act) as of and for the year ended December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends,

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

interest and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

Gross

​

Gross

​

Realized

​

Appreciation

​

December 31, 

Affiliated Person(1)

​

Asset

    

income

    

2023

    

Additions(2)

    

Reductions(3)

    

Gain (Loss)

    

(Depreciation)

    

2024

Non-controlled affiliates

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

First Lien Secured Delayed Draw Loan

​

$

116

​

$

—

​

$

677

​

$

—

​

$

—

​

$

570

​

$

1,247

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

Unsecured Loan

​

​

54

​

 

—

​

 

569

​

 

—

​

 

—

​

 

12

​

 

581

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

Unsecured Loan

​

​

55

​

 

—

​

 

583

​

 

—

​

 

—

​

 

11

​

 

594

Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC)

​

Common Units

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC)

​

Common Units

​

​

—

​

 

—

​

 

19,568

​

 

—

​

 

—

​

 

(10,437)

​

 

9,131

Camarillo Fitness Holdings, LLC (f/k/a Honors Holdings, LLC)

​

First Lien Secured Term Loan

​

​

36

​

 

—

​

 

10,270

​

 

—

​

 

—

​

 

222

​

 

10,492

H.I.G. Camarillo, L.P. (f/k/a Honors Holdings, LLC)

​

Limited Partner Interests

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Playmonster Group LLC

​

Priority First Lien Secured Term Loan

​

​

157

​

 

1,015

​

 

157

​

 

—

​

 

—

​

 

—

​

 

1,172

Playmonster Group LLC

​

First Lien Secured Term Loan

​

 

—

​

 

1,363

​

 

—

​

 

—

​

 

—

​

 

272

​

 

1,635

Playmonster Group Equity, Inc. (d/b/a PlayMonster)

​

Preferred Stock

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Playmonster Group Equity, Inc. (d/b/a PlayMonster)

​

Common Stock

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Chase Products Co. (f/k/a Starco)

​

Second Lien Secured Term Loan

​

​

380

​

 

2,793

​

 

380

​

 

—

​

 

—

​

 

169

​

 

3,342

Pressurized Holdings, LLC (f/k/a Starco)

​

Common Units

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

Pressurized Holdings, LLC (f/k/a Starco)

​

Preferred Units

​

​

—

​

 

251

​

 

—

​

 

—

​

 

—

​

 

1,406

​

 

1,657

Total Non-controlled affiliates

​

​

​

$

798

​

$

5,422

​

$

32,204

​

$

—

​

$

—

​

$

(7,775)

​

$

29,851

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends,

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

interest and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

Gross

​

Gross

​

Realized

​

Appreciation

​

December 31, 

Affiliated Person(1)

​

Asset

    

income

    

2023

    

Additions(2)

    

Reductions(3)

    

Gain (Loss)

    

(Depreciation)

    

2024

Controlled affiliates

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

American Crafts, LC

​

Super Senior Priority First Lien Secured Term Loan

​

$

107

​

$

—

​

$

2,374

​

$

—

​

$

—

​

$

(2,001)

​

$

373

American Crafts, LC

​

Super Senior Priority First Lien Secured Term Loan

​

​

96

​

​

—

​

​

1,230

​

​

—

​

​

—

​

​

(1,230)

​

​

—

American Crafts, LC

​

Super Priority First Lien Secured Term Loan

​

​

187

​

​

1,878

​

​

191

​

​

—

​

​

—

​

​

(2,069)

​

​

—

American Crafts, LC

​

Priority First Lien Secured Term Loan

​

​

(10)

​

​

3,226

​

​

—

​

​

—

​

​

—

​

​

(3,226)

​

​

—

American Crafts, LC

​

First Lien Secured Term Loan

​

​

—

​

​

553

​

​

—

​

​

—

​

​

—

​

​

(553)

​

​

—

American Crafts, LC

​

First Lien Secured Delayed Draw Loan

​

​

—

​

​

93

​

​

—

​

​

—

​

​

—

​

​

(93)

​

​

—

American Crafts Holdings, LLC (d/b/a American Crafts, LC)

​

Warrants

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

New American Crafts Holdings, LLC (d/b/a American Crafts, LC)

​

Class A Units

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

​

​

—

WHF STRS Ohio Senior Loan Fund LLC*

 

Subordinated Note

​

​

9,838

​

​

84,416

​

​

—

​

​

—

​

​

—

​

​

—

​

​

84,416

WHF STRS Ohio Senior Loan Fund LLC*

 

Equity

​

 

6,861

​

 

22,782

​

 

—

​

 

—

​

 

—

​

 

(41)

​

 

22,741

Total Controlled affiliates

 

  

​

$

17,079

​

$

112,948

​

$

3,795

​

$

—

​

$

—

​

$

(9,213)

​

$

107,530

​

*

For more information, see “Management of the STRS JV.”

(1)Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company.
(2)Gross additions may include increases in the cost basis of investments resulting from new portfolio investments, PIK, an exchange of existing investments for new investments and the transfers of an existing portfolio company into this category from a different category.
(3)Gross reductions may include decreases in the cost basis of investments resulting from principal collections related to investment repayments or sales, an exchange of existing investments for new investments and the transfers of an existing portfolio company into this category from a different category.

In January 2024, as part of a restructuring agreement between the Company and Arcstor Midco, LLC (d/b/a Arcserve (USA), the Company’s first lien secured term loan and priority first lien delayed draw loan investments in Arcstor Midco, LLC (d/b/a Arcserve (USA), converted into a new first lien secured delayed draw loan and unsecured notes in Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) and common equity of Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) and Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC).

In September 2024, as part of a restructuring and partial foreclosure agreement between the Company and Honors Holdings, LLC (d/b/a Orange Theory), the Company’s first lien secured term loan, first lien delayed draw loan and revolver investments in Honors Holdings, LLC, which had a historical cost basis of $17,816, were converted into a new first lien secured term loan of Camarillo Fitness Holdings, LLC (f/k/a Honors Holdings, LLC) and common equity interests in H.I.G. Camarillo, L.P. (f/k/a Honors Holdings, LLC). As of the restructuring date, these investments had an adjusted cost basis of $10,234. The remaining portion of the Honors Holdings, LLC first lien secured investments, with a cost basis of $7,582, was recognized as a net realized loss in the consolidated statements of operations.

WHF STRS Ohio Senior Loan Fund LLC

On January 14, 2019, the Company entered into an LLC operating agreement with STRS Ohio to co-manage a newly formed joint venture investment company, STRS JV, a Delaware LLC. STRS Ohio and the Company committed to provide up to $125,000 of subordinated notes and equity to STRS JV, with STRS Ohio providing up to $50,000 and the Company providing up to $75,000, respectively. In July 2019, STRS JV formally launched operations. STRS JV invests primarily in lower middle market, senior secured debt facilities, to performing lower middle market companies across a broad range of industries that typically carry a floating interest index rate such as SOFR and have a term of three to six years.

In February 2023, the Company increased its commitment to the STRS JV in the amount of an additional $15,000, which brings the Company’s total capital commitment to the STRS JV to $115,000, comprised of $92,000 of subordinated notes and $23,000 of LLC equity interests, and STRS Ohio increased its capital commitment to the STRS JV in the amount of an additional $10,000, which brings its total capital commitment to the STRS JV to $60,000, comprised of $48,000 of subordinated notes and $12,000 of LLC equity interests. In connection with these increases in capital commitments, the Company’s and STRS Ohio’s amended economic ownership in the STRS JV is approximately 65.71% and 34.29%, respectively.

In February 2022, the Company increased its capital commitment to the STRS JV in the amount of an additional $25,000, which brought the Company’s total capital commitment to $100,000, comprised of $80,000 of subordinated notes and $20,000 of LLC equity interests. In connection with this increase in the Company’s capital commitment, the Company and STRS Ohio’s amended economic ownership in the STRS JV is approximately 66.67% and 33.33%, respectively.

As of March 31, 2025 and December 31, 2024, STRS JV had total assets of $323,516 and $309,077, respectively. STRS JV’s portfolio consisted of debt investments in 41 portfolio companies as of March 31, 2025 and 38 portfolio companies as of December 31, 2024. As of both March 31, 2025 and December 31, 2024, the largest investment by aggregate principal amount (including any unfunded commitments) in a single portfolio company in STRS JV’s portfolio was $19,594. The five largest investments in portfolio companies by fair value in STRS JV totaled $79,522 and $79,058 as of March 31, 2025 and December 31, 2024, respectively. STRS JV invests in portfolio companies in the same industries in which the Company may directly invest.

The Company provides capital to STRS JV in the form of LLC equity interests and through interest-bearing subordinated notes. As of both March 31, 2025 and December 31, 2024, the Company and STRS Ohio owned approximately 65.71% and 34.29%, respectively, of the LLC equity interests of STRS JV. The Company’s investment in STRS JV consisted of equity contributions of $21,104 and advances of the subordinated notes of $84,416 as of both March 31, 2025 and December 31, 2024. As of both March 31, 2025 and December 31, 2024, the Company had commitments to fund equity interests and subordinated notes in STRS JV of $23,000 and $92,000, respectively, of which $1,896 and $7,584 were unfunded, respectively.

The Company and STRS Ohio each appoint two members to STRS JV’s four-person board of managers. All material decisions with respect to STRS JV, including those involving its investment portfolio, require unanimous approval of a quorum of the board of managers. Quorum is defined as (i) the presence of two members of the board of managers; provided

that at least one individual is present that was elected, designated or appointed by each member; (ii) the presence of three members of the board of managers; provided that the individual that was elected, designated or appointed by the member with only one individual present shall be entitled to cast two votes on each matter; or (iii) the presence of four members of the board of managers; provided that two individuals are present that were elected, designated or appointed by each member.

On July 19, 2019, STRS JV entered into a $125,000 credit and security agreement (the “STRS JV Credit Facility”) with JPMorgan Chase Bank, National Association (“JPMorgan”). On January 27, 2021, the terms of the STRS JV Credit Facility were amended to increase the size of the STRS JV Credit Facility from $125,000 to $175,000. On April 28, 2021, the terms of the STRS JV Credit Facility were amended and restated to enable borrowings in British pounds or euros. On July 15, 2021, the terms of the STRS JV Credit Facility were amended to allow STRS JV to reduce the applicable margins for interest rates to 2.35%, extend the non-call period from January 19, 2022 to January 19, 2023, extend the end of the reinvestment period from July 19, 2022 to July 19, 2023 and extend the scheduled termination date from July 19, 2024 to July 19, 2025.

On March 11, 2022, the terms of the STRS JV Credit Facility were further amended to (i) permanently increase STRS Credit’s availability under the STRS JV Credit Facility from $175,000 to $225,000, (ii) increase the minimum funding amount from $131,250 to $168,750, and (iii) apply an annual interest rate equal to the applicable SOFR plus 2.50% to borrowings greater than $175,000 in the STRS JV Credit Facility.

On January 13, 2023, the terms of the STRS JV Credit Facility were further amended to (i) permanently increase STRS Credit’s availability under the STRS JV Credit Facility from $225,000 to $262,500 (the “$37.5 Million Increase”) and (ii) apply an annual interest rate equal to applicable SOFR, plus 3.00% to any borrowings under the $37.5 Million Increase in the STRS JV Credit Facility. As a result of this amendment, any borrowings above $175,000 will incur an annual interest rate of SOFR plus 2.71% in the STRS JV Credit Facility.

On May 18, 2023, the terms of the STRS JV Credit Facility were further amended to (i) effective June 6, 2023 apply an annual interest rate equal to applicable SOFR plus 2.72% to any USD borrowings (ii) extend the scheduled termination date from July 19, 2025 to July 19, 2026 (iii) extend the non-call period from January 19, 2023 to January 19, 2024 and (iv) extend the end of the reinvestment period from July 19, 2023 to July 19, 2024.

On May 8, 2024, the terms of the STRS JV Credit Facility were further amended to (i) effective May 8, 2024 apply an annual interest rate equal to applicable base rate plus 2.50% to any EUR, GBP and USD denominated borrowings and 2.82% to any CAD denominated borrowings (ii) extend the scheduled termination date from July 19, 2026 to January 19, 2028 (iii) extend the non-call period from January 19, 2024 to May 8, 2025 and (iv) extend the end of the reinvestment period from July 19, 2024 to January 19, 2026.

On November 26, 2024, the terms of the STRS JV Credit Facility were further amended to, among other things, (i) reduce the spread from 2.50% to 2.25%, (ii) extend the non-call period from May 8, 2025, to November 26, 2026, (iii) extend the reinvestment period from January 19, 2026, to November 26, 2027, and (iv) extend the termination date from January 19, 2028, to November 26, 2029.

As of March 31, 2025, the STRS JV Credit Facility had $262,500 of commitments subject to leverage and borrowing base restrictions with an interest rate based on an index rate such as SOFR plus 2.25%. The final maturity date of the STRS JV Credit Facility is November 26, 2029. As of March 31, 2025, STRS JV had $159,060 of outstanding borrowings and an interest rate outstanding of 6.22% per annum under the STRS JV Credit Facility.

As of December 31, 2024, the STRS JV Credit Facility had $262,500 of commitments subject to leverage and borrowing base restrictions with an interest rate based on an index rate such as SOFR plus a spread of 2.25%. The maturity date of the STRS JV Credit Facility is November 26, 2029. As of December 31, 2024, STRS JV had $144,081 of outstanding borrowings and an interest rate outstanding of 6.42% per annum under the STRS JV Credit Facility.

​

Below is a listing of STRS JV’s individual investments as of March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Debt Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Advertising

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

11.20%

​

02/18/22

​

12/15/26

​

8,984

​

$

8,923

​

$

8,984

​

26.6

%

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

11.20%

​

03/11/22

​

12/15/26

​

3,016

​

​

2,995

​

​

3,016

​

8.9

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

11.20%

​

02/18/22

​

12/15/26

​

—

​

​

—

​

​

4

​

—

​

Trailhead Media LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.80% (9.05% Cash + 0.75% PIK)

​

01/22/25

​

12/28/29

​

6,644

​

​

6,549

​

​

6,558

​

19.3

​

Trailhead Media LLC(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.80% (9.05% Cash + 0.75% PIK)

​

01/22/25

​

12/28/29

​

—

​

​

—

​

​

4

​

—

​

Trailhead Media LLC(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.80% (9.05% Cash + 0.75% PIK)

​

01/22/25

​

12/28/29

​

—

​

​

—

​

​

1

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,467

​

​

18,567

​

54.8

​

Aerospace & Defense

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

09/13/24

​

12/05/28

​

3,672

​

​

3,626

​

​

3,694

​

11.0

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

09/13/24

​

12/05/28

​

—

​

​

—

​

​

16

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,626

​

​

3,710

​

11.0

​

Air Freight & Logistics

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

10.05%

​

02/17/22

​

06/15/26

​

3,298

​

​

3,281

​

​

3,300

​

9.7

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

10.05%

​

02/17/22

​

06/15/26

​

—

​

​

—

​

​

3

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,281

​

​

3,303

​

9.7

​

Broadline Retail

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

18,613

​

​

18,595

​

​

17,869

​

52.7

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

—

​

​

—

​

​

(38)

​

(0.1)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,595

​

​

17,831

​

52.6

​

Building Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Drew Foam Companies Inc

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.45%

​

11/09/20

​

12/07/26

​

13,465

​

​

13,416

​

​

13,372

​

39.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

13,416

​

​

13,372

​

39.4

​

Construction & Engineering

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.57%

​

12/21/23

​

01/02/29

​

3,014

​

​

2,958

​

​

2,941

​

8.7

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.57%

​

12/21/23

​

01/02/29

​

1,909

​

​

1,874

​

​

1,863

​

5.5

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.57%

​

12/21/23

​

01/02/29

​

—

​

​

—

​

​

(6)

​

—

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

01/28/25

​

02/08/29

​

5,104

​

​

5,009

​

​

5,101

​

15.0

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

01/29/25

​

02/07/29

​

568

​

​

558

​

​

568

​

1.7

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

01/29/25

​

02/07/29

​

246

​

​

241

​

​

250

​

0.7

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

06/14/24

​

05/31/29

​

5,336

​

​

5,247

​

​

5,365

​

15.8

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

19

​

0.1

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

12

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

15,887

​

​

16,113

​

47.5

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Data Processing & Outsourced Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Term Loan

​

1.00%

​

CORRA

​

6.00%

​

8.98%

​

01/22/20

​

12/21/26

​

18,279

​

$

14,135

​

​

12,703

​

37.4

%

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

6.00%

​

8.98%

​

01/22/20

​

12/21/26

​

—

​

​

—

​

​

1

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,135

​

​

12,704

​

37.4

​

Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.06%

​

04/26/24

​

04/16/30

​

4,080

​

​

4,028

​

​

4,070

​

12.0

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.75%

​

10.06%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

14

​

—

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.06%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

5

​

—

​

FloWorks International LLC

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

4.75%

​

9.07%

​

12/12/24

​

11/26/31

​

5,333

​

​

5,282

​

​

5,279

​

15.6

​

FloWorks International LLC(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

4.75%

​

9.07%

​

12/12/24

​

11/26/31

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

9,310

​

​

9,368

​

27.6

​

Diversified Support Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

6,908

​

​

6,796

​

​

6,973

​

20.5

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

—

​

​

—

​

​

16

​

—

​

Quest Events, LLC

​

First Lien Secured Term Loan

​

2.00%

​

SOFR

​

7.00%

​

11.56%

​

07/19/19

​

09/30/26

​

11,562

​

​

11,537

​

​

11,415

​

33.6

​

Quest Events, LLC(11)

​

First Lien Secured Revolving Loan

​

1.00%

​

Base Rate

​

6.25%

​

13.02%

​

07/19/19

​

09/30/26

​

412

​

​

411

​

​

406

​

1.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,744

​

​

18,810

​

55.3

​

Electrical Components & Equipment

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

12/03/24

​

11/04/30

​

3,522

​

​

3,472

​

​

3,472

​

10.2

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

12/03/24

​

11/04/30

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,472

​

​

3,472

​

10.2

​

Environmental & Facilities Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.42%

​

10.84%

​

08/09/23

​

08/01/29

​

6,886

​

​

6,764

​

​

6,877

​

20.3

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/09/23

​

08/01/29

​

2,163

​

​

2,117

​

​

2,174

​

6.4

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/09/23

​

08/01/29

​

234

​

​

230

​

​

247

​

0.7

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.81%

​

03/01/22

​

12/29/26

​

11,049

​

​

10,981

​

​

11,049

​

32.6

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.81%

​

03/01/22

​

12/29/26

​

2,337

​

​

2,322

​

​

2,337

​

6.9

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.77%

​

03/01/22

​

12/29/26

​

517

​

​

514

​

​

521

​

1.5

​

RLJ Pro-Vac, Inc. (d/b/a Pro-Vac)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.71%

​

01/23/24

​

12/31/26

​

6,642

​

​

6,561

​

​

6,613

​

19.5

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

29,489

​

​

29,818

​

87.9

​

Food Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Clark Restaurant Service, LLC (d/b/a CRS OneSource)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.07%

​

06/14/24

​

05/10/29

​

4,994

​

​

4,911

​

​

4,981

​

14.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,911

​

​

4,981

​

14.7

​

Health Care Facilities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

5.00%

​

9.32%

​

09/19/24

​

07/02/31

​

7,946

​

​

7,854

​

​

7,964

​

23.5

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

5.00%

​

9.32%

​

09/19/24

​

07/02/31

​

348

​

​

345

​

​

358

​

1.1

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Revolving Loan

​

0.75%

​

SOFR

​

5.00%

​

9.32%

​

09/19/24

​

07/02/31

​

—

​

​

—

​

​

8

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

8,199

​

​

8,330

​

24.6

​

Health Care Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

04/11/23

​

03/01/29

​

4,989

​

​

4,891

​

​

5,039

​

14.8

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

04/11/23

​

03/01/29

​

—

​

​

—

​

​

10

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,891

​

​

5,049

​

14.8

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Health Care Supplies

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

4.75%

​

9.05%

​

10/25/23

​

10/18/28

​

4,959

​

$

4,871

​

$

4,963

​

14.6

%

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

4.75%

​

9.05%

​

10/25/23

​

10/18/28

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,871

​

​

4,972

​

14.6

​

Human Resource & Employment Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Infotree Holdco LLC (d/b/a Infotree Global Solutions LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.05%

​

03/24/25

​

02/19/30

​

2,545

​

​

2,496

​

​

2,496

​

7.4

​

Infotree Holdco LLC (d/b/a Infotree Global Solutions LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.05%

​

03/24/25

​

02/19/30

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

2,496

​

​

2,496

​

7.4

​

Household Appliances

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Smalto Inc. (d/b/a PEMCO International)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.36%

​

05/04/22

​

04/28/28

​

6,423

​

​

6,691

​

​

6,947

​

20.5

​

Smalto Inc. (d/b/a PEMCO International)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.20%

​

05/04/22

​

04/28/28

​

978

​

​

968

​

​

978

​

2.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,659

​

​

7,925

​

23.4

​

IT Consulting & Other Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.10% (9.85% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

3,341

​

​

3,312

​

​

3,341

​

9.8

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Term Loan

​

1.00%

​

SONIA

​

5.75%

​

10.32% (10.07% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

512

​

​

664

​

​

664

​

2.0

​

Cennox, Inc. (d/b/a Cennox)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.39% (8.14% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

593

​

​

648

​

​

636

​

1.9

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.12% (9.87% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

97

​

​

96

​

​

97

​

0.3

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Revolving Loan

​

1.00%

​

SONIA

​

5.75%

​

10.32% (10.07% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

—

​

​

—

​

​

2

​

—

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.39%

​

10.81%

​

05/10/23

​

04/10/29

​

7,169

​

​

7,030

​

​

7,162

​

21.1

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.97%

​

10.39%

​

05/10/23

​

04/10/29

​

1,332

​

​

1,305

​

​

1,325

​

3.9

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

Prime

​

5.50%

​

13.00%

​

05/10/23

​

04/10/28

​

241

​

​

236

​

​

248

​

0.7

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.00%

​

9.45%

​

01/27/21

​

01/02/29

​

10,894

​

​

10,816

​

​

10,894

​

32.1

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.00%

​

9.44%

​

01/27/21

​

01/02/29

​

2,938

​

​

2,916

​

​

2,938

​

8.7

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.00%

​

9.44%

​

01/27/21

​

01/02/29

​

—

​

​

—

​

​

10

​

—

​

Turnberry Solutions, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

08/10/21

​

09/02/26

​

5,949

​

​

5,915

​

​

5,949

​

17.5

​

Turnberry Solutions, Inc.

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

08/10/21

​

09/02/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

32,938

​

​

33,270

​

98.0

​

Personal Care Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

G-2 Lather Acquisition Corp. (d/b/a Creative Laboratories, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.00%

​

9.32%

​

03/05/25

​

01/31/31

​

3,929

​

​

3,872

​

​

3,872

​

11.4

​

G-2 Lather Acquisition Corp. (d/b/a Creative Laboratories, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.00%

​

9.32%

​

03/05/25

​

01/31/31

​

—

​

​

—

​

​

—

​

—

​

G-2 Lather Acquisition Corp. (d/b/a Creative Laboratories, Inc.)(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.00%

​

9.32%

​

03/05/25

​

01/31/31

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,872

​

​

3,872

​

11.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Paper & Plastic Packaging Products & Materials

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

LINC Systems, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.50%

​

12.96%

​

06/22/21

​

02/24/26

​

8,091

​

$

8,059

​

$

8,091

​

23.9

%

LINC Systems, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

8.50%

​

12.96%

​

06/22/21

​

02/24/26

​

—

​

​

—

​

​

3

​

—

​

Max Solutions, Inc.(13)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.11%

​

12.56%

​

10/07/22

​

09/29/28

​

6,504

​

​

6,428

​

​

6,344

​

18.7

​

Max Solutions, Inc.(13)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

8.10%

​

12.54%

​

10/07/22

​

09/29/28

​

413

​

​

410

​

​

403

​

1.2

​

Max Solutions, Inc.(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

8.10%

​

12.54%

​

10/07/22

​

09/29/28

​

—

​

​

—

​

​

(2)

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,897

​

​

14,839

​

43.8

​

Packaged Foods & Meats

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

PANOS Brands, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.07%

​

06/14/24

​

05/14/29

​

4,509

​

​

4,434

​

​

4,502

​

13.3

​

PANOS Brands, LLC(11)

​

First Lien Secured Revolving Loan

​

1.00%

​

Base Rate

​

5.42%

​

10.79%

​

06/14/24

​

05/14/29

​

91

​

​

90

​

​

97

​

0.3

​

TableTrust Brands LLC (d/b/a Hain Pure Protein Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.17%

​

12/24/24

​

06/28/28

​

2,499

​

​

2,464

​

​

2,469

​

7.3

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,988

​

​

7,068

​

20.9

​

Pharmaceuticals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.39%

​

12/16/21

​

11/01/27

​

12,008

​

​

13,431

​

​

12,965

​

38.2

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

12/16/21

​

11/01/27

​

959

​

​

951

​

​

959

​

2.8

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

10.51%

​

12/16/21

​

11/01/27

​

871

​

​

864

​

​

871

​

2.6

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.44%

​

12/16/21

​

11/01/27

​

1,156

​

​

1,146

​

​

1,159

​

3.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,392

​

​

15,954

​

47.0

​

Real Estate Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.69%

​

12/28/21

​

10/19/26

​

5,551

​

​

5,517

​

​

5,386

​

15.9

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)(11)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

Base Rate

​

6.22%

​

11.01%

​

02/18/22

​

10/19/26

​

1,392

​

​

1,383

​

​

1,352

​

4.0

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.69%

​

02/18/22

​

10/19/26

​

602

​

​

599

​

​

573

​

1.7

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

03/01/22

​

01/21/27

​

6,454

​

​

6,407

​

​

5,876

​

17.3

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

03/01/22

​

01/21/27

​

725

​

​

720

​

​

660

​

1.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,626

​

​

13,847

​

40.8

​

Research & Consulting Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

6.00%

​

10.31%

​

01/10/24

​

11/21/29

​

3,608

​

​

3,538

​

​

3,566

​

10.5

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

6.00%

​

10.31%

​

01/10/24

​

11/21/29

​

—

​

​

—

​

​

(2)

​

—

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Revolving Loan

​

0.75%

​

Prime

​

5.00%

​

12.50%

​

01/10/24

​

11/21/28

​

142

​

​

139

​

​

143

​

0.4

​

E-Phoenix Acquisition Co. Inc. (d/b/a Integreon, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

07/15/21

​

06/23/27

​

8,320

​

​

8,281

​

​

8,320

​

24.5

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

11,958

​

​

12,027

​

35.4

​

Technology Hardware, Storage & Peripherals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/10/21

​

07/30/27

​

14,124

​

​

14,015

​

​

14,124

​

41.6

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/10/21

​

07/30/27

​

3,862

​

​

3,832

​

​

3,862

​

11.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

17,847

​

​

17,986

​

53.0

​

Water Utilities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

The Crom Corporation

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

03/05/25

​

01/31/31

​

4,080

​

​

4,020

​

​

4,020

​

11.8

​

The Crom Corporation(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

03/05/25

​

01/31/31

​

—

​

​

—

​

​

—

​

—

​

The Crom Corporation(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

03/05/25

​

01/31/31

​

144

​

​

142

​

​

142

​

0.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,162

​

​

4,162

​

12.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Wireless Telecommunication Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.82%

​

11/27/23

​

11/09/28

​

6,338

​

$

6,246

​

$

6,306

​

18.6

%

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.82%

​

11/27/23

​

11/09/28

​

—

​

​

—

​

​

8

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,246

​

​

6,314

​

18.6

​

Total Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

311,375

​

$

310,160

​

914.0

%

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds (included in cash and cash equivalents and restricted cash and cash equivalents)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Goldman Sachs Money Market Fund (CUSIP: 38141W315)(12)

​

​

​

​

​

​

​

​

​

4.19%

​

​

​

​

​

​

​

$

279

​

$

279

​

0.8

%

JPMORGAN U.S. Treas Plus Money Market Fund (Ticker: AJTXX)(12)

​

​

​

​

​

​

​

​

​

4.22%

​

​

​

​

​

​

​

​

746

​

​

746

​

2.2

​

Total Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

1,025

​

​

1,025

​

3.0

​

Total Investments and Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

312,400

​

$

311,185

​

917.0

%

​

Forward Currency Contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold (purchased)

​

    

Currency to be purchased (sold)

​

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

631

CAD

​

$

492

USD

​

5/7/25

​

$

—

​

$

—

Morgan Stanley

​

€

773

EUR

​

$

950

USD

​

5/7/25

​

​

—

​

​

(31)

Total

​

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(31)

(1)Except as noted, all investments provide collateral for the STRS JV Credit Facility and are domiciled in the United States.
(2)The investments bear interest at a rate that may be determined by reference to SOFR, CORRA, SONIA, Prime, EurIBOR, which resets monthly, quarterly or semiannually. The one, three and six-month SOFR were 4.3%, 4.3% and 4.2%, respectively as of March 31, 2025. The Prime was 7.5% as of March 31, 2025. The CORRA was 2.8% as of March 31, 2025.
(3)The interest rate is the “all-in-rate” including the current index and spread, the fixed rate, and the PIK interest rate, as the case may be.
(4)Except as otherwise noted, all of STRS JV’s portfolio company investments, which as of the date of the portfolio represented 914.0% of STRS JV’s members’ equity or 95.9% of STRS JV’s total assets, are subject to legal restrictions on sales.
(5)The fair value of each investment was determined using significant unobservable inputs.
(6)The investment or a portion of the investment does not provide collateral for the STRS JV Credit Facility.
(7)The issuer is domiciled in Canada.
(8)Principal amount is denominated in GBP and the issuer is domiciled in the United Kingdom.
(9)Principal amount is denominated in EUR.
(10) Principal amount is denominated in CAD.
(11)The investment was comprised of two contracts, which were indexed to Prime and a different base rate, SOFR, SONIA or CORRA. The Floor, Spread Above Index and Interest Rate presented represent the weighted average of both contracts.
(12)The rate shown is the annualized seven-day yield as of March 31, 2025.
(13)Investment is structured as a unitranche loan in which the STRS JV may receive additional interest on its “last out” tranche of the portfolio company’s senior term debt, which was previously syndicated into “first out” and “last out” tranches, whereby the “first out” tranche will have priority as to the “last out” tranche with respect to payments of principal, interest and any other amounts due thereunder.
(14)

Below is a listing of STRS JV’s individual investments as of December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Debt Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Advertising

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

02/18/22

​

12/15/26

​

9,007

​

$

8,937

​

$

9,007

​

26.1

%

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/11/22

​

12/15/26

​

3,023

​

​

3,000

​

​

3,023

​

8.7

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

02/18/22

​

12/15/26

​

—

​

​

—

​

​

5

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

11,937

​

​

12,035

​

34.8

​

Aerospace & Defense

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.94%

​

09/13/24

​

12/05/28

​

3,681

​

​

3,633

​

​

3,675

​

10.6

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.94%

​

09/13/24

​

12/05/28

​

—

​

​

—

​

​

7

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,633

​

​

3,682

​

10.6

​

Air Freight & Logistics

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

10.35%

​

02/17/22

​

06/15/26

​

3,307

​

​

3,286

​

​

3,307

​

9.6

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

10.35%

​

02/17/22

​

06/15/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,286

​

​

3,311

​

9.6

​

Broadline Retail

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

18,613

​

​

18,577

​

​

17,865

​

51.6

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

—

​

​

—

​

​

(38)

​

(0.1)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,577

​

​

17,827

​

51.5

​

Building Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Drew Foam Companies Inc

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.48%

​

11/09/20

​

12/07/26

​

13,501

​

​

13,445

​

​

13,437

​

38.8

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

13,445

​

​

13,437

​

38.8

​

Construction & Engineering

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.61%

​

12/21/23

​

01/02/29

​

3,033

​

​

2,974

​

​

2,981

​

8.6

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.59%

​

12/21/23

​

01/02/29

​

1,502

​

​

1,472

​

​

1,477

​

4.3

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.61%

​

12/21/23

​

01/02/29

​

420

​

​

412

​

​

415

​

1.2

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/17/23

​

02/07/28

​

5,117

​

​

5,015

​

​

5,111

​

14.8

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/17/23

​

02/07/28

​

569

​

​

558

​

​

569

​

1.7

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/17/23

​

02/07/28

​

338

​

​

331

​

​

341

​

1.0

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.83%

​

06/14/24

​

05/31/29

​

5,349

​

​

5,254

​

​

5,338

​

15.4

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.83%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

9

​

—

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.83%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

12

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,016

​

​

16,253

​

47.0

​

Data Processing & Outsourced Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Term Loan

​

1.00%

​

CORRA

​

6.00%

​

9.49%

​

01/22/20

​

12/21/26

​

18,415

​

​

14,234

​

​

12,883

​

37.2

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

6.00%

​

9.49%

​

01/22/20

​

12/21/26

​

—

​

​

—

​

​

2

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,234

​

​

12,885

​

37.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.40%

​

04/26/24

​

04/16/30

​

4,080

​

$

4,027

​

$

4,070

​

11.8

%

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.75%

​

10.40%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

15

​

—

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.40%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

6

​

—

​

FloWorks International LLC

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

4.75%

​

9.27%

​

12/12/24

​

11/26/31

​

5,333

​

​

5,280

​

​

5,281

​

15.3

​

FloWorks International LLC(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

5.75%

​

10.40%

​

12/12/24

​

11/26/31

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

9,307

​

​

9,372

​

27.1

​

Diversified Support Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

7,425

​

​

7,298

​

​

7,425

​

21.5

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

—

​

​

—

​

​

17

​

—

​

Quest Events, LLC

​

First Lien Secured Term Loan

​

2.00%

​

SOFR

​

7.00%

​

11.59%

​

07/19/19

​

09/30/26

​

11,592

​

​

11,563

​

​

11,592

​

33.5

​

Quest Events, LLC

​

First Lien Secured Revolving Loan

​

2.00%

​

SOFR

​

7.00%

​

11.59%

​

07/19/19

​

09/30/26

​

247

​

​

246

​

​

248

​

0.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

19,107

​

​

19,282

​

55.7

​

Electrical Components & Equipment

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.81%

​

12/03/24

​

11/04/30

​

3,531

​

​

3,479

​

​

3,479

​

10.1

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.81%

​

12/03/24

​

11/04/30

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,479

​

​

3,479

​

10.1

​

Environmental & Facilities Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.42%

​

10.88%

​

08/09/23

​

08/01/29

​

6,904

​

​

6,774

​

​

6,952

​

20.1

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.00%

​

8.45%

​

08/09/23

​

08/01/29

​

2,168

​

​

2,120

​

​

2,183

​

6.3

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

08/09/23

​

08/01/29

​

234

​

​

230

​

​

248

​

0.7

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.84%

​

03/01/22

​

12/29/26

​

11,078

​

​

11,000

​

​

11,078

​

32.0

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.85%

​

03/01/22

​

12/29/26

​

2,343

​

​

2,326

​

​

2,343

​

6.8

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.82%

​

03/01/22

​

12/29/26

​

517

​

​

513

​

​

522

​

1.5

​

RLJ Pro-Vac, Inc. (d/b/a Pro-Vac)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.71%

​

01/23/24

​

12/31/26

​

6,659

​

​

6,566

​

​

6,637

​

19.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

29,529

​

​

29,963

​

86.6

​

Food Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Clark Restaurant Service, LLC (d/b/a CRS OneSource)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.11%

​

06/14/24

​

05/10/29

​

5,006

​

​

4,919

​

​

4,993

​

14.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,919

​

​

4,993

​

14.4

​

Health Care Facilities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

5.25%

​

9.79%

​

09/19/24

​

07/02/31

​

7,962

​

​

7,866

​

​

7,919

​

22.9

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

5.25%

​

9.78%

​

09/19/24

​

07/02/31

​

78

​

​

78

​

​

80

​

0.2

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Revolving Loan

​

0.75%

​

SOFR

​

5.25%

​

9.78%

​

09/19/24

​

07/02/31

​

—

​

​

—

​

​

5

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,944

​

​

8,004

​

23.1

​

Health Care Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.46%

​

04/11/23

​

03/01/29

​

5,002

​

​

4,898

​

​

4,986

​

14.4

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.46%

​

04/11/23

​

03/01/29

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,898

​

​

4,995

​

14.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Health Care Supplies

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.00%

​

9.33%

​

10/25/23

​

10/18/28

​

4,972

​

$

4,877

​

$

5,021

​

14.5

%

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.00%

​

9.33%

​

10/25/23

​

10/18/28

​

—

​

​

—

​

​

9

​

—

​

Medical Device Inc. (d/b/a Arterex)

​

First Lien Secured Term Loan

​

1.25%

​

SOFR

​

6.25%

​

10.68%

​

07/27/23

​

07/11/29

​

2,633

​

​

2,584

​

​

2,660

​

7.7

​

Medical Device Inc. (d/b/a Arterex)

​

First Lien Secured Revolving Loan

​

1.25%

​

SOFR

​

6.25%

​

10.68%

​

07/27/23

​

07/11/29

​

—

​

​

—

​

​

6

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,461

​

​

7,696

​

22.2

​

Household Appliances

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Smalto Inc. (d/b/a PEMCO International)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.86%

​

05/04/22

​

04/28/28

​

6,423

​

​

6,682

​

​

6,654

​

19.2

​

Smalto Inc. (d/b/a PEMCO International)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.21%

​

05/04/22

​

04/28/28

​

978

​

​

967

​

​

978

​

2.8

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,649

​

​

7,632

​

22.0

​

IT Consulting & Other Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

10.34%

​

09/11/24

​

05/04/29

​

3,350

​

​

3,319

​

​

3,344

​

9.7

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Term Loan

​

1.00%

​

SONIA

​

5.50%

​

10.40%

​

09/11/24

​

05/04/29

​

513

​

​

665

​

​

643

​

1.9

​

Cennox, Inc. (d/b/a Cennox)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

5.75%

​

9.14%

​

09/11/24

​

05/04/29

​

594

​

​

649

​

​

611

​

1.8

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

10.25%

​

09/11/24

​

05/04/29

​

29

​

​

29

​

​

30

​

0.1

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Revolving Loan

​

1.00%

​

SONIA

​

5.50%

​

10.40%

​

09/11/24

​

05/04/29

​

—

​

​

—

​

​

2

​

—

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.39%

​

10.85%

​

05/10/23

​

04/10/29

​

7,187

​

​

7,040

​

​

7,176

​

20.7

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.97%

​

10.51%

​

05/10/23

​

04/10/29

​

821

​

​

804

​

​

817

​

2.4

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

Prime

​

5.50%

​

13.00%

​

05/10/23

​

04/10/28

​

241

​

​

236

​

​

249

​

0.7

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.73%

​

01/27/21

​

01/02/29

​

10,923

​

​

10,839

​

​

10,923

​

31.6

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.99%

​

01/27/21

​

01/02/29

​

2,946

​

​

2,922

​

​

2,946

​

8.5

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.99%

​

01/27/21

​

01/02/29

​

—

​

​

—

​

​

11

​

—

​

Turnberry Solutions, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.21%

​

08/10/21

​

09/02/26

​

5,964

​

​

5,924

​

​

5,964

​

17.2

​

Turnberry Solutions, Inc.

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.21%

​

08/10/21

​

09/02/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

32,427

​

​

32,720

​

94.6

​

Packaged Foods & Meats

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

PANOS Brands, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.13%

​

06/14/24

​

05/14/29

​

4,520

​

​

4,441

​

​

4,505

​

13.0

​

PANOS Brands, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.15%

​

06/14/24

​

05/14/29

​

30

​

​

30

​

​

36

​

0.1

​

TableTrust Brands LLC (d/b/a Hain Pure Protein Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.22%

​

12/24/24

​

06/28/28

​

2,505

​

​

2,468

​

​

2,468

​

7.1

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,939

​

​

7,009

​

20.2

​

Paper & Plastic Packaging Products & Materials

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

LINC Systems, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.50%

​

12.99%

​

06/22/21

​

02/24/26

​

8,155

​

​

8,114

​

​

8,155

​

23.7

​

LINC Systems, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

8.50%

​

12.99%

​

06/22/21

​

02/24/26

​

—

​

​

—

​

​

3

​

—

​

Max Solutions, Inc.(13)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.11%

​

12.57%

​

10/07/22

​

09/29/28

​

6,521

​

​

6,439

​

​

6,324

​

18.3

​

Max Solutions, Inc.(13)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

8.10%

​

12.56%

​

10/07/22

​

09/29/28

​

414

​

​

411

​

​

402

​

1.2

​

Max Solutions, Inc.(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

8.10%

​

12.56%

​

10/07/22

​

09/29/28

​

—

​

​

—

​

​

(3)

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,964

​

​

14,881

​

43.2

​

Pharmaceuticals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.85%

​

12/16/21

​

11/01/27

​

12,039

​

​

13,449

​

​

12,465

​

36.0

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.48%

​

12/16/21

​

11/01/27

​

962

​

​

952

​

​

962

​

2.8

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

10.51%

​

12/16/21

​

11/01/27

​

874

​

​

865

​

​

874

​

2.5

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.44%

​

12/16/21

​

11/01/27

​

1,156

​

​

1,145

​

​

1,160

​

3.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,411

​

​

15,461

​

44.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Real Estate Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

11.02%

​

12/28/21

​

10/19/26

​

5,563

​

$

5,523

​

$

5,395

​

15.6

%

HRG Management, LLC (d/b/a HomeRiver Group, LLC)(11)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

Base Rate

​

6.97%

​

11.29%

​

02/18/22

​

10/19/26

​

1,395

​

​

1,384

​

​

1,354

​

3.9

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

11.02%

​

02/18/22

​

10/19/26

​

483

​

​

480

​

​

455

​

1.3

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

03/01/22

​

01/21/27

​

6,502

​

​

6,448

​

​

5,918

​

17.1

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

03/01/22

​

01/21/27

​

725

​

​

719

​

​

660

​

1.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,554

​

​

13,782

​

39.8

​

Research & Consulting Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

6.00%

​

10.51%

​

01/10/24

​

11/21/29

​

3,617

​

​

3,543

​

​

3,574

​

10.3

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

6.00%

​

10.51%

​

01/10/24

​

11/21/29

​

—

​

​

—

​

​

(2)

​

—

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Revolving Loan

​

0.75%

​

Prime

​

5.00%

​

12.50%

​

01/10/24

​

11/21/28

​

60

​

​

58

​

​

63

​

0.2

​

E-Phoenix Acquisition Co. Inc. (d/b/a Integreon, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.98%

​

07/15/21

​

06/23/27

​

8,342

​

​

8,299

​

​

8,342

​

24.1

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

11,900

​

​

11,977

​

34.6

​

Technology Hardware, Storage & Peripherals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

08/10/21

​

07/30/27

​

14,162

​

​

14,041

​

​

14,095

​

40.7

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

08/10/21

​

07/30/27

​

3,872

​

​

3,839

​

​

3,854

​

11.1

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

17,880

​

​

17,949

​

51.8

​

Wireless Telecommunication Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.02%

​

11/27/23

​

11/09/28

​

6,354

​

​

6,256

​

​

6,323

​

18.3

​

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.02%

​

11/27/23

​

11/09/28

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,256

​

​

6,332

​

18.3

​

Total Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

296,752

​

$

294,957

​

852.3

%

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds (included in cash and cash equivalents and restricted cash and cash equivalents)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Goldman Sachs Money Market Fund (CUSIP: 38141W315)(12)

​

​

​

​

​

​

​

​

​

4.33%

​

​

​

​

​

​

​

$

242

​

$

242

​

0.7

%

JPMORGAN U.S. Treas Plus Money Market Fund (Ticker: AJTXX)(12)

​

​

​

​

​

​

​

​

​

4.39%

​

​

​

​

​

​

​

​

525

​

​

525

​

1.5

​

Total Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

767

​

​

767

​

2.2

​

Total Investments and Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

297,519

​

$

295,724

​

854.5

%

​

​

Forward Currency Contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold (purchased)

​

    

Currency to be purchased (sold)

​

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

681

CAD

​

$

492

USD

​

2/4/25

​

$

—

​

$

17

Morgan Stanley

​

€

870

EUR

​

$

950

USD

​

2/4/25

​

​

—

​

​

47

Total

​

​

​

​

​

​

​

​

​

​

​

$

—

​

$

64

​

(1)Except as noted, all investments provide collateral for the STRS JV Credit Facility and are domiciled in the United States.
(2)The investments bear interest at a rate that may be determined by reference SOFR, CORRA, SONIA, Prime, EurIBOR, which resets monthly, quarterly or semiannually.
(3)The interest rate is the “all-in-rate” including the current index and spread, the fixed rate, and the PIK interest rate, as the case may be.
(4)Except as otherwise noted, all of the STRS JV’s portfolio company investments, which as of the date of the portfolio represented 852.3% of STRS JV’s members’ equity or 95.4% of STRS JV’s total assets, are subject to legal restrictions on sales.
(5)The fair value of each investment was determined using significant unobservable inputs.
(6)The investment or a portion of the investment does not provide collateral for the STRS JV Credit Facility.
(7)The issuer is domiciled in Canada.
(8)Principal amount is denominated in GBP and the issuer is domiciled in the United Kingdom.
(9)Principal amount is denominated in Euros.
(10) Principal amount is denominated in CAD.
(11)The investment was comprised of two contracts, which were indexed to Prime and a different base rate, SOFR, SONIA or CORRA. The Floor, Spread Above Index and Interest Rate presented represent the weighted average of both contracts.
(12)The rate shown is the annualized seven-day yield as of December 31, 2024.
(13)Investment is structured as a unitranche loan in which the STRS JV may receive additional interest on its “last out” tranche of the portfolio company’s senior term debt, which was previously syndicated into “first out” and “last out” tranches, whereby the “first out” tranche will have priority as to the “last out” tranche with respect to payments of principal, interest and any other amounts due thereunder.

​

As of March 31, 2025 and December 31, 2024, the portfolio companies underlying the STRS JV investments are all located in the United States and its territories except for Geo Logic Systems Ltd., which is domiciled in Canada, and Cennox Holdings Limited and Solar Holdings Bidco Limited, which are domiciled in the United Kingdom. As of March 31, 2025 and December 31, 2024, STRS JV had no investments on non-accrual status. STRS JV had outstanding commitments to fund investments totaling $30,747, and $24,724 under delayed draw term loan commitments and undrawn revolvers as of March 31, 2025 and December 31, 2024, respectively.

​

Below is certain summarized financial information for STRS JV as of March 31, 2025 and December 31, 2024 and for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

Selected Balance Sheet Information ($ in thousands)

​

As of March 31, 2025

​

As of December 31, 2024

Assets

 

​

  

 

​

  

Investments, at fair value (amortized cost of $311,375 and $296,752 respectively)

​

$

310,160

​

$

294,957

Cash and cash equivalents

​

 

11,151

​

 

12,454

Interest receivable

​

​

1,862

​

​

1,427

Amounts receivable on unsettled investment transactions

​

​

288

​

​

143

Unrealized appreciation on foreign currency forward contracts

​

​

—

​

​

64

Other assets

​

 

55

​

 

32

Total assets

​

$

323,516

​

$

309,077

Liabilities

​

 

  

​

 

  

Credit facility (net of unamortized debt issuance costs of $2,889 and $3,024, respectively)

​

$

156,171

​

$

141,057

Note payable to members

​

 

128,459

​

 

128,459

Interest payable on credit facility

​

 

838

​

 

807

Interest payable on notes to members

​

 

3,475

​

 

3,589

Unrealized depreciation on foreign currency forward contracts

​

​

31

​

​

—

Other liabilities

​

 

607

​

 

558

Total liabilities

​

 

289,581

​

 

274,470

Members’ equity

​

 

33,935

​

 

34,607

Total liabilities and members’ equity

​

$

323,516

​

$

309,077

​

​

​

​

​

​

​

​

​

​

Three Months Ended

Selected Statement of Operations Information ($ in thousands)

    

March 31, 2025

    

March 31, 2024

Interest and fee income

​

$

8,535

​

$

10,089

Total investment income

​

$

8,535

​

$

10,089

Interest expense on credit facility

​

 

3,009

​

 

3,756

Interest expense on notes to members

​

 

3,475

​

 

3,800

Administrative fee

​

 

155

​

 

162

Other expenses

​

 

156

​

 

216

Total expenses

​

$

6,795

​

$

7,934

Net investment income

​

 

1,740

​

 

2,155

Net realized gains (losses) on investments and foreign currency transactions

​

 

65

​

 

(112)

Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions

​

 

(375)

​

 

1,187

Net increase in members’ equity resulting from operations

​

$

1,430

​

$

3,230

​
v3.25.1
FAIR VALUE MEASUREMENTS
 3 Months Ended
Mar. 31, 2025
FAIR VALUE MEASUREMENTS  
FAIR VALUE MEASUREMENTS

NOTE 5 – FAIR VALUE MEASUREMENTS

Accounting standards establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value:

Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active public markets that the entity has the ability to access as of the measurement date.

Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

Level 3: Significant unobservable inputs that reflect a reporting entity’s own assumptions about what market participants would use in pricing an asset or liability.

In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, a financial instrument’s categorization within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the financial instrument.

A review of the fair value hierarchy classifications is conducted on a quarterly basis. Changes in the observability of valuation inputs may result in a reclassification for certain financial assets or liabilities. Reclassifications impacting Level 3 of the fair value hierarchy are reported as transfers in or out of the Level 3 category as of the beginning of the quarter in which the reclassifications occur. During the three months ended March 31, 2025 and year ended December 31, 2024, there were no changes in the observability of valuation inputs that would have resulted in a reclassification of assets between any levels.

Fair value for each investment is derived using a combination of valuation methodologies that, in the judgment of the Investment Committee are most relevant to such investment, including, without limitation, being based on one or more of the following: (i) market prices obtained from market makers for which the Investment Committee has deemed there to be enough breadth (number of quotes) and depth (firm bids) to be indicative of fair value, (ii) the price paid or realized in a completed transaction or binding offer received in an arm’s-length transaction, (iii) a discounted cash flow analysis, (iv) the guideline public company method, (v) the similar transaction method or (vi) the option pricing method.

​

The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Level 1

    

Level 2

    

Level 3

    

Total

First lien secured loans

​

$

—

​

$

—

​

$

516,563

​

$

516,563

Second lien secured loans

​

 

—

​

 

—

​

 

3,442

​

 

3,442

Unsecured loans

​

​

—

​

 

—

​

 

1,202

​

 

1,202

Subordinated Note to STRS JV

​

 

—

​

 

—

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

—

​

 

—

​

 

23,077

​

 

23,077

Equity in STRS JV(1)

​

 

—

​

 

—

​

 

—

​

 

22,299

Total investments

​

$

—

​

$

—

​

$

628,700

​

$

650,999

(1)The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities.

The Company’s money market funds (included in cash and cash equivalents and restricted cash and cash equivalents), which were valued at $14,322 as of March 31, 2025, are characterized in Level 1 of the fair value hierarchy.

The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Level 1

    

Level 2

    

Level 3

​

Total

First lien secured loans

​

$

—

​

$

—

​

$

502,693

​

$

502,693

Second lien secured loans

​

 

—

​

 

—

​

 

8,342

​

 

8,342

Unsecured loans

​

​

—

​

 

—

​

 

1,175

​

 

1,175

Subordinated Note to STRS JV

​

 

—

​

 

—

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

—

​

 

—

​

 

22,846

​

 

22,846

Equity in STRS JV(1)

​

 

—

​

 

—

​

 

—

​

 

22,741

Total investments

​

$

—

​

$

—

​

$

619,472

​

$

642,213

(1)The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities.

The Company’s money market funds (included in cash and cash equivalents and restricted cash and cash equivalents), which were valued at $13,249 as of December 31, 2024, are characterized in Level 1 of the fair value hierarchy.

The Company’s forward currency contracts, which were valued at $20 as of December 31, 2024, are characterized in Level 2 of the hierarchy.

​

The following table presents the changes in investments measured at fair value using Level 3 inputs for the three months ended March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Three months ended March 31, 2025

​

Loans

​

Loans

​

Loans

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

502,693

 

$

8,342

 

$

1,175

 

$

84,416

 

$

22,846

​

$

619,472

Funding of investments

​

 

47,222

 

 

—

 

​

—

 

 

—

 

 

—

​

 

47,222

Non-cash interest income

​

 

564

 

 

100

 

​

27

 

 

—

 

 

—

​

 

691

Accretion of discount

​

 

892

 

 

47

 

​

1

 

 

—

 

 

—

​

 

940

Proceeds from paydowns and sales

​

 

(32,473)

 

 

(5,000)

 

​

—

 

 

—

 

 

—

​

 

(37,473)

Realized gains (losses)

​

 

(395)

 

 

—

 

​

—

 

 

—

 

 

—

​

 

(395)

Net unrealized appreciation (depreciation)

​

 

(1,940)

 

 

(47)

 

​

(1)

 

 

—

 

 

231

​

 

(1,757)

Fair value, end of period

​

$

516,563

 

$

3,442

 

$

1,202

 

$

84,416

 

$

23,077

​

$

628,700

Change in unrealized appreciation (depreciation) on investments still held as of March 31, 2025

​

$

(1,460)

​

$

—

​

$

(1)

​

$

—

​

$

231

​

$

(1,230)

​

The following table presents the changes in investments measured at fair value using Level 3 inputs for the three months ended March 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Three months ended March 31, 2024

​

Loans

​

Loans

​

Notes

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

555,878

 

$

16,246

 

$

167

 

$

84,416

 

$

16,679

​

$

673,386

Funding of investments

​

 

58,085

 

 

—

 

​

—

 

 

—

 

 

117

​

 

58,202

Non-cash interest income

​

 

2,016

 

 

—

 

​

16

 

 

—

 

 

—

​

 

2,032

Accretion of discount

​

 

1,100

 

 

15

 

​

1

 

 

—

 

 

—

​

 

1,116

Proceeds from paydowns and sales

​

 

(52,289)

 

 

(2,040)

 

​

—

 

 

—

 

 

—

​

 

(54,329)

Conversions

​

 

(8,852)

 

 

(11,769)

 

​

1,053

 

 

—

 

 

19,568

​

 

—

Realized gains (losses)

​

 

(331)

 

 

(5,817)

 

​

—

 

 

—

 

 

—

​

 

(6,148)

Net unrealized appreciation (depreciation)

​

 

6,662

 

 

8,313

 

​

2

 

 

—

 

 

(13,975)

​

 

1,002

Fair value, end of period

​

$

562,269

 

$

4,948

 

$

1,239

 

$

84,416

 

$

22,389

​

$

675,261

Change in unrealized appreciation (depreciation) on investments still held as of March 31, 2024

​

$

(2,738)

​

$

45

​

$

1

​

$

—

​

$

(13,978)

​

$

(16,670)

​

The significant unobservable inputs used in the fair value measurement of the Company’s investments are the discount rate, market quotes and exit multiples. An increase or decrease in the discount rate in isolation would result in significantly lower or higher fair value measurement, respectively. An increase or decrease in the market quote for an investment would in isolation result in significantly higher or lower fair value measurement, respectively. An increase or decrease in the exit multiple would in isolation result in significantly higher or lower fair value measurement, respectively. As the fair value of a debt investment diverges from par, which would generally be the case for non-accrual loans, the fair value measurement of that investment is more susceptible to volatility from changes in exit multiples as a significant unobservable input.

​

The following tables summarize the significant unobservable inputs the Company used to value the majority of its investments categorized within Level 3 as of March 31, 2025 and December 31, 2024. The tables are not intended to be all-inclusive, but instead capture the significant unobservable inputs relevant to the Company’s determination of fair values. These ranges represent the significant unobservable inputs that were used in the valuation of each type of investment, but they do not represent a range of values for any one investment.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Fair Value as of

​

Valuation

​

Unobservable

​

Range

Investment Type

​

​

March 31, 2025

​

Techniques

​

Inputs

​

(Weighted Average)(1)

First lien secured loans

​

$

443,843

​

Discounted cash flow analysis

​

Discount Rate

​

7.6% - 22.8% (12.5%)

​

​

​

37,962

​

Recent transaction

​

Transaction Price

​

75.0 - 99.5 (96.2)

​

​

​

33,104

​

Enterprise value analysis

​

EBITDA Multiple

​

4.5 - 8.0 (6.6)

​

​

​

1,601

​

Enterprise value analysis

​

Revenue Multiple

​

0.7 - 0.7 (0.7)

​

​

​

53

​

Option pricing Model

​

Volatility

​

20.0 - 20.0 (20.0)

Second lien secured loans

​

​

3,442

​

Discounted cash flow analysis

​

Discount rate

​

12.5% - 12.5% (12.5%)

Unsecured loans

​

​

1,202

​

Discounted cash flow analysis

​

Discount rate

​

12.3% - 13.0% (12.7%)

Subordinated Notes to STRS JV

​

​

84,416

​

Enterprise value analysis

​

n/a

​

n/a

Common equity

​

​

10,378

​

Enterprise value analysis

​

EBITDA multiple

​

5.3 - 12.4 (9.6)

​

​

​

9,121

​

Enterprise value analysis

​

Revenue Multiple

​

0.7 - 2.1 (2.1)

Preferred equity

​

​

3,464

​

Enterprise value analysis

​

EBITDA multiple

​

6.5 - 10.0 (6.9)

Warrant

​

​

114

​

Enterprise value analysis

​

EBITDA multiple

​

6.1 - 6.1 (6.1)

Total Level 3 Investments

​

$

628,700

​

​

​

​

​

​

(1)Unobservable inputs were weighted by the relative fair value of the investments.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Fair Value as of

​

Valuation

​

Unobservable

​

Range

Investment Type

​

​

December 31, 2024

​

Techniques

​

Inputs

​

(Weighted Average)(1)

First lien secured loans

​

$

439,577

​

Discounted cash flow analysis

​

Discount Rate

​

7.7% - 26.8% (13.1%)

​

​

​

19,554

​

Recent transaction

​

Transaction Price

​

98.0 - 100.0 (98.5)

​

​

​

22,923

​

Enterprise value analysis

​

EBITDA Multiple

​

5.8 - 8.0 (6.9)

​

​

​

1,635

​

Enterprise value analysis

​

Revenue Multiple

​

1.4 - 1.4 (1.4)

​

​

​

9,104

​

Expected repayment

​

Transaction Price

​

103.0 - 103.0 (103.0)

​

​

​

373

​

Collateral analysis

​

Recovery Rate

​

0.0 - 15.0 (15.0)

​

​

​

9,453

​

Market quotations

​

Broker quoted price

​

96.8 - 96.8 (96.8)

​

​

​

74

​

Option pricing Model

​

Volatility

​

16.0 - 16.0 (16.0)

Second lien secured loans

​

​

8,342

​

Discounted cash flow analysis

​

Discount rate

​

11.7% - 12.5% (12.0%)

Unsecured loans

​

​

1,175

​

Discounted cash flow analysis

​

Discount rate

​

12.3% - 12.9% (12.6%)

Subordinated Notes to STRS JV

​

​

84,416

​

Enterprise value analysis

​

n/a

​

n/a

Common equity

​

​

10,728

​

Enterprise value analysis

​

EBITDA multiple

​

5.3 - 13.7 (9.8)

​

​

​

9,132

​

Enterprise value analysis

​

Revenue Multiple

​

1.4 - 2.0 (2.0)

Preferred equity

​

​

2,916

​

Enterprise value analysis

​

EBITDA multiple

​

6.5 - 12.1 (7.5)

Warrant

​

​

70

​

Enterprise value analysis

​

EBITDA multiple

​

5.5 - 5.5 (5.5)

Total Level 3 Investments

​

$

619,472

​

​

​

​

​

​

(1)Unobservable inputs were weighted by the relative fair value of the investments.

​

Valuation of investments may be determined by weighting various valuation techniques. Significant judgment is required in selecting the assumptions used to determine the fair values of these investments. The valuation methods selected for a particular investment are based on the circumstances and on the sufficiency of data available to measure fair value. If more than one valuation method is used to measure fair value, the results are evaluated and weighted, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances.

The availability of observable inputs can vary depending on the financial instrument and is affected by a wide variety of factors, including, for example, the nature of the instrument, whether the instrument is traded on an active exchange or in the secondary market and the current market conditions. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires a greater degree of judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for financial instruments classified as Level 3.

The determination of fair value using the selected methodologies takes into consideration a range of factors including the price at which the investment was acquired, the nature of the investment, local market conditions, trading values on public and private exchanges for comparable securities, current and projected operating performance and financing transactions subsequent to the acquisition of the investment, compliance with agreed upon terms and covenants, and assessment of credit ratings of an underlying borrower. These valuation methodologies involve a significant degree of judgment to be exercised.

As it relates to investments which do not have an active public market, there is no single standard for determining the estimated fair value. Valuations of privately held investments are inherently uncertain, and they may fluctuate over short periods of time and may be based on estimates. The determination of fair value may differ materially from the values that would have been used if a ready market for these investments existed.

In some cases, fair value for such investments is best expressed as a range of values derived utilizing different methodologies from which a single estimate may then be determined. Consequently, fair value for each investment may be derived using a combination of valuation methodologies that, in the judgment of the investment professionals, are most relevant to such investment. The selected valuation methodologies for a particular investment are consistently applied on each measurement date. However, a change in a valuation methodology or its application from one measurement date to another is possible if the change results in a measurement that is equally or more representative of fair value in the circumstances.

The following table presents the principal amount and fair value of the Company’s borrowings as of March 31, 2025 and December 31, 2024. The fair value of the Credit Facility (as defined in Note 6) was estimated by discounting remaining payments using applicable market rates or market quotes for similar instruments at the measurement date, if available. As of March 31, 2025, and December 31, 2024 the Credit Facility approximates its carrying value presented net of unamortized debt issuance costs and original issuance discount, net of accretion. The fair value of the Company’s 5.375% private notes due 2025 (the “5.375% 2025 Notes”), the 5.375% private notes due 2026 (the “5.375% 2026 Notes”), the 4.00% notes due 2026 (the “4.000% 2026 Notes”), the 5.625% private notes due 2027 (the “5.625% 2027 Notes”) and the 4.25% private notes due 2028 (the “4.250% 2028 Notes”) were estimated using discounted future cash flows to the valuation date. As of March 31, 2025 and December 31, 2024, the fair value of the 7.875% 2028 Notes approximates the principal amounts outstanding.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of March 31, 2025

​

As of December 31, 2024

​

​

Fair

​

​

​

​

​

​

​

​

​

​

​

    

Value Level

    

Principal Amount Outstanding

    

Fair Value

    

Principal Amount Outstanding

    

Fair Value

JPM Credit Facility

 

3

​

$

170,136

​

$

168,547

​

$

161,493

​

$

160,745

5.375% 2025 Notes

 

3

​

 

40,000

​

 

39,815

​

​

40,000

​

 

39,594

5.375% 2026 Notes

​

3

​

​

10,000

​

​

9,865

​

 

10,000

​

​

9,765

4.000% 2026 Notes

 

3

​

 

75,000

​

 

72,319

​

 

75,000

​

 

71,342

5.625% 2027 Notes

 

3

​

 

10,000

​

 

9,850

​

​

10,000

​

 

9,719

4.250% 2028 Notes

​

3

​

​

25,000

​

 

23,382

​

​

25,000

​

 

22,911

7.875% 2028 Notes

​

3

​

​

34,500

​

​

34,500

​

​

34,500

​

​

34,500

​

​

​

​

$

364,636

​

$

358,278

​

$

355,993

​

$

348,576

​
v3.25.1
BORROWINGS
 3 Months Ended
Mar. 31, 2025
BORROWINGS  
BORROWINGS

NOTE 6 – BORROWINGS

Historically, the 1940 Act has permitted the Company to issue “senior securities,” including borrowing money from banks or other financial institutions, only in amounts such that its asset coverage, as defined in the 1940 Act, equals at least 200% after such incurrence or issuance. In March 2018, the Small Business Credit Availability Act (the “SBCAA”) was enacted into law. The SBCAA amended the 1940 Act to reduce the asset coverage requirements applicable to business development companies from 200% to 150% so long as the business development company meets certain disclosure requirements and obtains certain approvals. At the Company’s annual meeting of stockholders held on August 1, 2018, the Company’s stockholders approved the reduced asset coverage ratio from 200% to 150%, such that the Company’s maximum debt-to-equity ratio increased from a prior maximum of 1.0x (equivalent of $1 of debt outstanding for each $1 of equity) to a maximum of 2.0x (equivalent to $2 of debt outstanding for each $1 of equity). As a result, the Company’s asset coverage requirements applicable to senior securities decreased from 200% to 150%, effective August 2, 2018. As of March 31, 2025 and December 31, 2024, the Company’s asset coverage for borrowed amounts were 177.2% and 180.4%, respectively.

Total borrowings outstanding and available as of March 31, 2025, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Maturity

    

Rate

    

Principal Amount Outstanding

    

Amortized Cost

    

Available

JPM Credit Facility(1)

 

1/17/2030

 

S+2.250

%  

$

170,136

​

$

168,547

​

$

164,864

5.375% 2025 Notes

 

10/20/2025

 

5.375

%  

 

40,000

​

 

39,925

​

 

—

5.375% 2026 Notes

 

12/4/2026

 

5.375

%  

 

10,000

​

 

9,951

​

 

—

4.000% 2026 Notes

 

12/15/2026

 

4.000

%  

 

75,000

​

 

74,417

​

 

—

5.625% 2027 Notes

 

12/4/2027

 

5.625

%  

 

10,000

​

 

9,933

​

 

—

4.250% 2028 Notes

​

12/6/2028

​

4.250

%  

​

25,000

​

​

24,809

​

​

—

7.875% 2028 Notes

​

9/15/2028

​

7.875

%  

​

34,500

​

​

33,551

​

​

—

Total debt

 

​

​

​

​

$

364,636

​

$

361,133

​

$

164,864

(1)All foreign denominated principal borrowings have been converted to USD using the exchange rates as of the applicable reporting date.

​

Total borrowings outstanding and available as of December 31, 2024, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Maturity

    

Rate

    

Principal Amount Outstanding

    

Amortized Cost

    

Available

JPM Credit Facility(1)

 

11/22/2025

 

S+2.500

%  

$

161,493

​

$

160,745

​

$

173,507

5.375% 2025 Notes

 

10/20/2025

 

5.375

%  

 

40,000

​

 

39,892

​

 

—

5.375% 2026 Notes

 

12/4/2026

 

5.375

%  

 

10,000

​

 

9,943

​

 

—

4.000% 2026 Notes

 

12/15/2026

 

4.000

%  

 

75,000

​

 

74,332

​

 

—

5.625% 2027 Notes

 

12/4/2027

 

5.625

%  

 

10,000

​

 

9,926

​

 

—

4.250% 2028 Notes

​

12/6/2028

​

4.250

%  

​

25,000

​

​

24,796

​

​

—

7.875% 2028 Notes

​

9/15/2028

​

7.875

%  

​

34,500

​

​

33,483

​

​

—

Total debt

 

​

​

​

​

$

355,993

​

$

353,117

​

$

173,507

(1)All foreign denominated principal borrowings have been converted to USD using the exchange rates as of the applicable reporting date.

​

Credit Facility: On December 23, 2015, WhiteHorse Credit entered into a revolving credit and security agreement with JPMorgan, as administrative agent, (the “Administrative Agent”) and lender (the “Credit Facility”).

On January 4, 2022, the terms of the Credit Facility were amended to continue to establish a temporary upsize to the borrowing capacity under the Credit Facility, which allowed WhiteHorse Credit to borrow up to $335,000 for a four-month period that originally began on October 4, 2021.

On February 4, 2022, the terms of the Credit Facility were further amended to apply an annual interest rate equal to applicable SOFR plus 2.50% to any borrowings under the Credit Facility.

On March 30, 2022, the terms of the Credit Facility were further amended to (i) increase WhiteHorse Credit’s availability under the Credit Facility from $310,000 to $335,000; (ii) retain an accordion feature which allows for the expansion of the borrowing limit up to $375,000; and (iii) increase the minimum funding amount from $217,000 to $234,500.

On April 12, 2023, the terms of the Credit Facility were further amended to (i) apply an annual interest rate equal to the applicable base rate plus 2.50% to any USD denominated borrowings, and (ii) convert to SOFR for USD denominated borrowings effective June 6, 2023.

On January 17, 2025, the terms of the Credit Facility were amended to, among other things, (i) reduce the applicable margins for interest rates to 2.25%, (ii) extend the non-call period to January 17, 2027, (iii) extend the reinvestment period to January 17, 2028, and (iv) extend the scheduled termination date to January 17, 2030.

The Credit Facility bears interest at SOFR plus 2.25% on all outstanding USD denominated borrowings. The Credit Facility bears interest at EurIBOR for EUR denominated borrowings, CDOR for CAD denominated borrowings, SONIA for GBP denominated borrowings, plus, in each case, a spread of 2.25% on outstanding borrowings. The Company is required to pay a non-usage fee which accrues at 0.55% per annum on the average daily unused amount of the financing commitments to the extent the aggregate principal amount available under the Credit Facility has not been borrowed. The minimum borrowing requirement is $234,500. In connection with the Credit Facility, WhiteHorse Credit pledged securities with a fair value of approximately $521,207 as of March 31, 2025. The Credit Facility has a maturity date of January 17, 2030.

Under the Credit Facility, the Company has made certain customary representations and warranties and is required to comply with various covenants, including leverage restrictions, reporting requirements and other customary requirements for similar credit facilities.

As of March 31, 2025, the Company had $170,136 in outstanding borrowings and $164,864 undrawn under the Credit Facility. Weighted average outstanding borrowings were $175,345 at a weighted average interest rate of 6.62% for the three months ended March 31, 2025. As of March 31, 2025, the interest rate in effect on outstanding borrowings was 6.45%. The Company’s ability to draw down undrawn funds under the Credit Facility is determined by collateral and portfolio quality requirements stipulated in the credit and security agreement. As of March 31, 2025, $164,864 was available to be drawn by the Company based on these requirements.

As of December 31, 2024, the Company had $161,493 in outstanding borrowings and $173,507 undrawn under the Credit Facility. For the year ended December 31, 2024, weighted average outstanding borrowings were $183,014 at a weighted average interest rate of 7.67%. As of December 31, 2024, the interest rate in effect on outstanding borrowings was 6.88%. The Company’s ability to draw down undrawn funds under the Credit Facility is determined by collateral and portfolio quality requirements stipulated in the credit and security agreement. As of December 31, 2024, $173,507 was available to be drawn by the Company based on these requirements.

5.375% 2025 Notes: On October 20, 2020, the Company entered into a Note Purchase Agreement (the “2025 Note Purchase Agreement”) governing the issuance of $40,000 in aggregate principal amount of unsecured notes (the “5.375% 2025 Notes”) to qualified institutional investors in a private placement. The 5.375% 2025 Notes have a fixed interest rate of 5.375% and are due on October 20, 2025, unless redeemed, purchased or prepaid prior to such date by the Company or its affiliates in accordance with their terms. Interest on the 5.375% 2025 Notes is payable semiannually on April 20 and October 20, at a fixed, annual rate of 5.375%. This interest rate is subject to increase (up to 6.375%) in the event that, subject to certain exceptions, the 5.375% 2025 Notes cease to have an investment grade rating. In addition, the Company is obligated to offer to repay the 5.375% 2025 Notes at par if certain change in control events occur. The 5.375% 2025 Notes are general unsecured obligations of the Company that rank pari passu with all outstanding and future unsecured unsubordinated indebtedness issued by the Company.

5.375% 2026 Notes: On December 4, 2020, the Company entered into a Note Purchase Agreement (the “2026 Note Purchase Agreement”) governing the issuance of $10,000 in aggregate principal amount of unsecured notes (the

“5.375% 2026 Notes”) to qualified institutional investors in a private placement. The 5.375% 2026 Notes have a fixed interest rate of 5.375% and are due on December 4, 2026, unless redeemed, purchased or prepaid prior to such date by the Company or its affiliates in accordance with their terms. Interest on the 5.375% 2026 Notes is payable semiannually on June 4 and December 4, at a fixed, annual rate of 5.375%. This interest rate is subject to increase (up to 6.375%) in the event that, subject to certain exceptions, the 5.375% 2026 Notes cease to have an investment grade rating. In addition, the Company is obligated to offer to repay the 5.375% 2026 Notes at par if certain change in control events occur. The 5.375% 2026 Notes are general unsecured obligations of the Company that rank pari passu with all outstanding and future unsecured unsubordinated indebtedness issued by the Company.

4.000% 2026 Notes: On November 24, 2021, the Company completed a public offering of $75,000 of aggregate principal amount of unsecured notes, the net proceeds of which were used to fund investments in debt and equity securities and repay outstanding indebtedness under the Credit Facility. Interest on the 4.000% 2026 Notes is payable semiannually on June 15 and December 15, at a fixed, annual rate of 4.000%. The 4.000% 2026 Notes will mature on December 15, 2026 and may be redeemed in whole or in part at any time prior to September 15, 2026, at par plus a “make-whole” premium, and thereafter at par. The 4.000% 2026 Notes are direct unsecured obligations and are structurally subordinate to borrowings under the Credit Facility and will rank pari passu with all outstanding and future unsecured unsubordinated indebtedness.

5.625% 2027 Notes: On December 4, 2020, the Company entered into a Note Purchase Agreement (the “2027 Note Purchase Agreement”) governing the issuance of $10,000 in aggregate principal amount of unsecured notes (the “5.625% 2027 Notes”) to qualified institutional investors in a private placement. The 5.625% 2027 Notes have a fixed interest rate of 5.625% and are due on December 4, 2027, unless redeemed, purchased or prepaid prior to such date by the Company or its affiliates in accordance with their terms. Interest on the 5.625% 2027 Notes is payable semiannually on June 4 and December 4, at a fixed, annual rate of 5.625%. This interest rate is subject to increase (up to 6.625%) in the event that, subject to certain exceptions, the 5.625% 2027 Notes cease to have an investment grade rating. In addition, the Company is obligated to offer to repay the 5.625% 2027 Notes at par if certain change in control events occur. The 5.625% 2027 Notes are general unsecured obligations of the Company that rank pari passu with all outstanding and future unsecured unsubordinated indebtedness issued by the Company.

4.250% 2028 Notes: On December 6, 2021, the Company entered into a Note Purchase Agreement (the “2028 Note Purchase Agreement,”) governing the issuance of $25,000 in aggregate principal amount of unsecured notes (the “4.25% 2028 Notes”) to qualified institutional investors in a private placement. Interest on the 4.250% 2028 Notes is payable semiannually on June 6 and December 6, at a fixed, annual rate of 4.25%. This interest rate is subject to increase (up to 5.25%) in the event that, subject to certain exceptions, the 4.250% 2028 Notes cease to have an investment grade rating. The 4.250% 2028 Notes mature on December 6, 2028, unless redeemed, purchased or prepaid prior to such date by us or our affiliates in accordance with their terms. The 4.250% 2028 Notes are general unsecured obligations that rank pari passu with all outstanding and future unsecured unsubordinated indebtedness that we may issue. The closing of the transaction occurred on December 6, 2021.

7.875% 2028 Notes: On August 24, 2023, the Company completed a public offering of 7.875% 2028 Notes in aggregate principal amount of $30,000, the net proceeds of which were used to fund investments in debt and equity securities and repay outstanding indebtedness under its revolving credit facility. Additionally, the offering included an overallotment feature for up to an additional $4,500 of aggregate principal amount under the same terms as the initial offering. On August 31, 2023, the underwriters fully exercised their option to purchase an additional $4,500, bringing the aggregate principal amount of the 7.875% 2028 Notes to $34,500. Interest on the 7.875% 2028 Notes is paid quarterly on March 15, June 15, September 15 and December 15 each year, at an annual rate of 7.875%. The 7.875% 2028 Notes will mature on September 15, 2028 and may be redeemed in whole or in part at any time, or from time to time, at the Company’s option on or after September 15, 2025. The 7.875% 2028 Notes are direct unsecured obligations and are structurally subordinate to borrowings under the Credit Facility and will rank pari passu with all outstanding and future unsecured unsubordinated indebtedness we may issue. The 7.875% 2028 Notes are listed on the Nasdaq Global Select Market under the trading symbol “WHFCL.”
v3.25.1
RELATED PARTY TRANSACTIONS
 3 Months Ended
Mar. 31, 2025
RELATED PARTY TRANSACTIONS  
RELATED PARTY TRANSACTIONS

NOTE 7 - RELATED PARTY TRANSACTIONS

Investment Advisory Agreement: WhiteHorse Advisers serves as the Company’s investment adviser in accordance with the terms of an investment advisory agreement. On October 30, 2024, at an in-person meeting, the Company’s board of directors approved a second amended and restated investment advisory agreement, which was executed by the Company on February 22, 2024 (the “Investment Advisory Agreement”). Subject to the overall supervision of the Company’s board of directors, WhiteHorse Advisers manages the day-to-day operations of, and provides investment management services to, the Company. Under the terms of the Investment Advisory Agreement, WhiteHorse Advisers:

●determines the composition of the investment portfolio, the nature and timing of the changes to the portfolio and the manner of implementing such changes;
●identifies, evaluates and negotiates the structure of the investments the Company makes (including performing due diligence on the Company’s prospective portfolio companies); and
●closes, monitors and administers the investments the Company makes, including the exercise of any voting or consent rights.

In addition, WhiteHorse Advisers provides the Company with access to personnel and an Investment Committee. Under the Investment Advisory Agreement, the Company pays WhiteHorse Advisers a fee for investment management services consisting of a base management fee and an incentive fee. The Investment Advisory Agreement may be terminated by either party without penalty upon 60 days’ written notice to the other party.

Base Management Fee

Effective January 1, 2024, the base management fee is calculated at an annual rate equal to 1.75% based on the Company’s consolidated gross assets (including cash and cash equivalents and assets purchased with borrowed funds); provided, however, the base management fee will be calculated at an annual rate equal to 1.25% of the Company’s consolidated gross assets (including cash and cash equivalents and assets purchased with borrowed funds), that exceed the product of (i) 200% and (ii) the value of the Company’s total net assets, at the end of the two most recently completed calendar quarters. Base management fees are payable quarterly in arrears and are appropriately pro-rated for any partial month or quarter.

Prior to January 1, 2024, the base management fee is calculated at an annual rate of 2.00% based on the Company’s consolidated gross assets (including cash and cash equivalents and assets purchased with borrowed funds); provided, however, the base management fee will be calculated at an annual rate equal to 1.25% of the Company’s consolidated gross assets (including cash and cash equivalents and assets purchased with borrowed funds) that exceed the product of (i) 200% and (ii) the value of the Company’s total net assets, at the end of the two most recently completed calendar quarters. Base management fees are payable quarterly in arrears and are appropriately pro-rated for any partial month or quarter.

The following table details management fee expenses for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31, 

​

Management Fees ($ in thousands)

    

​

2025

​

​

2024

    

Base management fees

​

$

2,833

​

$

3,116

​

Total management fees

​

$

2,833

​

$

3,116

​

​

As of March 31, 2025 and December 31, 2024, management fees payable on the consolidated statements of assets and liabilities were $2,833 and $2,932, respectively.

Performance-based Incentive Fee

The performance-based incentive fee consists of two components that are independent of each other, except as provided by the Incentive Fee Cap and Deferral Mechanism discussed below.

The calculations of these two components have been structured to include a fee limitation such that no incentive fee will be paid to the investment adviser for any quarter if, after such payment, the cumulative incentive fees paid to the investment adviser for the period that includes the current fiscal quarter and the 11 full preceding fiscal quarters, referred to as the “Incentive Fee Look-back Period,” would exceed 20.0% of the Cumulative Pre-Incentive Fee Net Return (as defined below) during the Incentive Fee Look-back Period.

Each quarterly incentive fee is subject to the Incentive Fee Cap (as defined below) and a deferral mechanism through which the investment adviser may recap a portion of such deferred incentive fees, which is referred to together as the “Incentive Fee Cap and Deferral Mechanism.”

This limitation is accomplished by subjecting each incentive fee payable to a cap, which is referred to as the “Incentive Fee Cap.” The Incentive Fee Cap in any quarter is equal to (a) 20.0% of Cumulative Pre-Incentive Fee Net Return during the Incentive Fee Look-back Period less (b) cumulative incentive fees of any kind paid to the investment adviser during the Incentive Fee Look-back Period. To the extent the Incentive Fee Cap is zero or a negative value in any quarter, the Company will pay no incentive fee to its investment adviser in that quarter. The Company will only pay incentive fees to the extent allowed by the Incentive Fee Cap and Deferral Mechanism. To the extent that the payment of incentive fees is limited by the Incentive Fee Cap and Deferral Mechanism, the payment of such fees may be deferred and paid in subsequent quarters up to three years after their date of deferment, subject to applicable limitations included in the Investment Advisory Agreement. The deferral component of the Incentive Fee Cap and Deferral Mechanism may cause incentive fees that accrued during one fiscal quarter to be paid to the investment adviser at any time during the 11 full fiscal quarters following such initial full fiscal quarter.

The “Cumulative Pre-Incentive Fee Net Return” refers to the sum of (a) Pre-Incentive Fee Net Investment Income (as defined below) for each period during the Incentive Fee Look-back Period and (b) the sum of cumulative realized capital gains, cumulative realized capital losses, cumulative unrealized capital depreciation and cumulative unrealized capital appreciation during the applicable Incentive Fee Look-back Period.

The first component, which is income-based (the “Income Incentive Fee”), is calculated and payable quarterly in arrears and is determined based on Pre-Incentive Fee Net Investment Income for the immediately preceding calendar quarter, subject to the Incentive Fee Cap and Deferral Mechanism. For this purpose, “Pre-Incentive Fee Net Investment Income” means, in each case on a consolidated basis, interest income, distribution income and any other income (including any other fees (other than fees for providing managerial assistance), such as commitment, origination, structuring, diligence and consulting fees or other fees received from portfolio companies) accrued during the calendar quarter, minus the Company’s operating expenses for the quarter (including the base management fee, expenses payable under the administration agreement (the “Administration Agreement”), any interest expense and any dividends paid on any issued and outstanding preferred stock, but excluding the incentive fee). Pre-Incentive Fee Net Investment Income does not include any realized capital gains, realized capital losses or unrealized capital appreciation or depreciation.

The operation of the first component of the incentive fee for each quarter is as follows:

●no incentive fee is payable to the Company’s investment adviser in any calendar quarter in which Pre-Incentive Fee Net Investment Income does not exceed the “Hurdle Rate” of 1.75% (7.00% annualized);
●100% of Pre-Incentive Fee Net Investment Income with respect to that portion of such Pre-Incentive Fee Net Investment Income, if any, that exceeds the Hurdle Rate but is less than 2.1875% in any calendar quarter (8.75% annualized) is payable to the Company’s investment adviser. This portion of the Company’s Pre-Incentive Fee Net Investment Income (which exceeds the Hurdle Rate but is less than 2.1875%) is referred to as the “catch-up.” The effect of the catch-up is that, if such Pre-Incentive Fee Net Investment Income exceeds 2.1875% in any calendar quarter, the investment adviser will receive 20% of such Pre-Incentive Fee Net Investment Income as if the Hurdle Rate did not apply; and
●20% of the amount of such Pre-Incentive Fee Net Investment Income, if any, that exceeds 2.1875% in any calendar quarter (8.75% annualized) is payable to the Company’s investment adviser (once the Hurdle Rate is reached and the catch-up is achieved, 20% of all Pre-Incentive Fee Net Investment Income).

The portion of such incentive fee that is attributable to deferred interest (such as PIK interest or original issue discount) will be paid to the investment adviser, together with interest from the date of deferral to the date of payment, only if and to the extent that the Company actually receives such interest in cash, and any accrual will be reversed if and to the extent such interest is reversed in connection with any write-off or similar treatment of the investment giving rise to any deferred interest accrual. Any reversal of such amounts would reduce net income for the quarter by the net amount of the reversal (after taking into account the reversal of incentive fees payable) and would result in a reduction and possibly elimination of the incentive fees for such quarter.

There is no accumulation of amounts on the Hurdle Rate from quarter to quarter and, accordingly, there is no clawback of amounts previously paid if subsequent quarters are below the quarterly Hurdle Rate and there is no delay of payment if prior quarters are below the quarterly Hurdle Rate. Since the Hurdle Rate is fixed, as interest rates rise, it will be easier for the investment adviser to surpass the Hurdle Rate and receive an incentive fee based on Pre-Incentive Fee Net Investment Income.

Net investment income used to calculate this component of the incentive fee is also included in the amount of consolidated gross assets used to calculate the base management fee. These calculations will be appropriately prorated for any period of less than three months and adjusted for any share issuances or repurchases during the current quarter.

The second component, the capital gains component of the incentive fee (the “Capital Gains Incentive Fee”), which is determined and payable in arrears as of the end of each calendar year (or upon termination of the Investment Advisory Agreement, as of the termination date), commenced on January 1, 2013, and equals 20% of cumulative aggregate realized capital gains from January 1 through the end of each calendar year, computed net of aggregate cumulative realized capital losses and aggregate cumulative unrealized capital depreciation through the end of each year (the “Capital Gains Incentive Fee Base”), less the aggregate amount of any previously paid capital gains incentive fees and subject to the Incentive Fee Cap and Deferral Mechanism. If such amount is negative, then no capital gains incentive fee will be payable for the year. Additionally, if the Investment Advisory Agreement is terminated as of a date that is not a calendar year end, the termination date will be treated as though it were a calendar year end for purposes of calculating and paying the capital gains incentive fee. The capital gains component of the incentive fee is not subject to any minimum return to stockholders.

In accordance with GAAP, the Company is also required to include the aggregate unrealized capital appreciation on investments in the calculation and accrue a capital gains incentive fee on a quarterly basis if such unrealized capital appreciation were realized, even though such unrealized capital appreciation is not permitted to be considered in calculating the fee actually payable under the Investment Advisory Agreement. If the Capital Gains Incentive Fee Base, adjusted as required by GAAP to include unrealized capital appreciation, is positive at the end of a reporting period, then GAAP requires the Company to accrue a Capital Gains Incentive Fee equal to 20% of such amount, less the aggregate amount of any Capital Gains Incentive Fees previously paid and Capital Gains Incentive Fees accrued under GAAP in all prior periods. If such amount is negative, then there is no accrual for such period. The resulting accrual under GAAP in a given period may result in either additional expense (if such cumulative amount is greater than in the prior period) or a reversal of previously recorded expense (if such cumulative amount is less than in the prior period). There can be no assurance that such unrealized capital appreciation will be realized in the future.

Because of the structure of the incentive fee, it is possible that the Company may pay an incentive fee in a quarter where it incurs a loss subject to the Incentive Fee Cap and Deferral Mechanism. For example, if the Company receives Pre-Incentive Fee Net Investment Income in excess of the Hurdle Rate, it will pay the applicable Income Incentive Fee even after incurring a loss in that quarter due to realized and unrealized capital losses.

The following table provides a breakdown of the performance-based incentive fees for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31, 

​

Performance-based Incentive Fees ($ in thousands)

    

​

2025

​

​

2024

    

Income incentive fee

​

$

1,711

​

$

2,704

​

Capital gains incentive fee

​

​

—

​

​

—

​

Total performance-based incentive fees

​

$

1,711

​

$

2,704

​

​

As of March 31, 2025 and December 31, 2024, incentive fees payable on the consolidated statements of assets and liabilities were $17,977 and $17,848, respectively. As of March 31, 2025 and December 31, 2024, there were zero incentive fees payable on the consolidated statements of assets and liabilities for cumulative accruals of Capital Gains Incentive Fees under GAAP, including any amounts payable pursuant to the Investment Advisory Agreement as described above.

Administration Agreement: Pursuant to the Administration Agreement, WhiteHorse Administration furnishes the Company with office facilities, equipment and clerical, bookkeeping and record keeping services to enable the Company to operate. Under the Administration Agreement, WhiteHorse Administration performs, or oversees the performance of, the Company’s required administrative services, which include being responsible for the financial records which the Company is required to maintain and preparing reports to its stockholders and reports filed with the U.S. Securities and Exchange Commission. In addition, WhiteHorse Administration assists the Company in determining and publishing its net asset value, oversees the preparation and filing of its tax returns and the printing and dissemination of reports to its stockholders and generally oversees the payment of the Company’s expenses and the performance of administrative and professional services rendered to the Company by others. Payments under the Administration Agreement equal an amount based upon the Company’s allocable portion of WhiteHorse Administration’s overhead in performing its obligations under the Administration Agreement, including rent and the Company’s allocable portion of the cost of its chief financial officer and chief compliance officer along with their respective staffs. Under the Administration Agreement, WhiteHorse Administration also provides on the Company’s behalf managerial assistance to those portfolio companies to which the Company is required to provide such assistance. The Administration Agreement may be terminated by either party without penalty upon 60 days’ written notice to the other party. To the extent that WhiteHorse Administration outsources any of its functions, the Company will pay the fees associated with such functions on a direct basis without any profit to WhiteHorse Administration.

Substantially all the Company’s payments of operating expenses to third parties were made by a related party, for which such third party received reimbursement from the Company.

During both the three months ended March 31, 2025 and 2024, the Company incurred $171 of allocated administrative service fees, respectively.

Co-investments with Related Parties: As of March 31, 2025 and December 31, 2024, no officers or employees affiliated with or employed by WhiteHorse Advisers and its related entities maintained any co-investments in the Company’s or STRS JV’s investments.

As of March 31, 2025 and December 31, 2024, certain funds affiliated with WhiteHorse Advisers and its related entities maintained co-investments in the Company’s or STRS JV’s investments of $6,253,596 and $5,890,052, respectively.

STRS JV: For the three months ended March 31, 2025, the Company sold $17,000 of investments to STRS JV and recognized zero net realized losses. For the three months ended March 31, 2024, the Company sold $8,478 of investments to STRS JV and recognized zero net realized losses.
v3.25.1
COMMITMENTS AND CONTINGENCIES
 3 Months Ended
Mar. 31, 2025
COMMITMENTS AND CONTINGENCIES  
COMMITMENTS AND CONTINGENCIES

NOTE 8 - COMMITMENTS AND CONTINGENCIES

Commitments: In the normal course of business, the Company is party to financial instruments with off-balance-sheet risk to meet the financing needs of its borrowers. These financial instruments include commitments to extend credit and involve, to varying degrees, elements of credit risk in excess of the amount recognized in the consolidated statement of assets and liabilities. The Company attempts to limit its credit risk by conducting extensive due diligence and obtaining collateral where appropriate.

The balance of unfunded commitments to extend credit was $31,914 and $26,385 as of March 31, 2025 and December 31, 2024, respectively. Commitments to extend credit consist principally of the unused portions of commitments that obligate the Company to extend credit, such as revolving credit arrangements or similar transactions. These commitments are often subject to financial or non-financial milestones and other conditions to borrow that must

be achieved before the commitment can be drawn. In addition, the commitments generally have fixed expiration dates or other termination clauses. Since commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.

The following table summarizes the Company’s unfunded commitments as of March 31, 2025 and December 31, 2024:

​

​

​

​

​

​

​

​

Unfunded Commitments ($ in thousands)

    

As of March 31, 2025

    

As of December 31, 2024

Revolving Loan Commitments:

​

​

​

​

​

​

Bridgepoint Healthcare, LLC

​

$

1,350

​

$

1,350

BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)

​

​

643

​

​

459

Claridge Products and Equipment, LLC

​

​

70

​

​

70

Coastal Television Broadcasting Group LLC

​

​

309

​

​

309

EducationDynamics, LLC

​

​

1,199

​

​

1,199

ELM One Call Locators, Inc. (d/b/a One Call Locators, Ltd.)

​

​

900

​

​

—

Gulf Winds International Acquisition LLC (d/b/a Gulf Winds International, Inc.)

​

​

—

​

​

194

Impact Advisors, LLC

​

​

467

​

​

—

Infotree Holdco LLC (d/b/a Infotree Global Solutions LLC)

​

​

530

​

​

—

Leviathan Intermediate Holdco, LLC

​

​

418

​

​

570

LogicMonitor, Inc.

​

​

778

​

​

778

Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)

​

​

343

​

​

246

M&M OpCo, LLC (d/b/a Escalent, Inc.)

​

​

238

​

​

238

PANOS Brands, LLC

​

​

329

​

​

384

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

​

7

​

​

—

Quest Events, LLC

​

​

35

​

​

—

Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)

​

​

880

​

​

880

Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)

​

​

861

​

​

861

SCIC Buyer, Inc. (d/b/a Sigma Corporation)

​

​

1,625

​

​

—

Sleep OpCo LLC (d/b/a Brooklyn Bedding LLC)

​

​

2,646

​

​

2,646

Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)

​

​

—

​

​

146

Telestream Holdings Corporation

​

​

241

​

​

241

The Kyjen Company, LLC (d/b/a Outward Hound)

​

​

422

​

​

—

TOT Group, Inc. (d/b/a Netevia Group LLC)

​

​

553

​

​

553

Trailhead Media LLC

​

​

—

​

​

870

W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)

​

​

515

​

​

515

W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)

​

​

1,195

​

​

1,195

Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC)

​

​

1,806

​

​

1,806

Total unfunded revolving loan commitments

​

​

18,360

​

​

15,510

​

​

​

​

​

​

​

Delayed Draw Loan Commitments:

​

​

​

​

​

​

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

​

1,422

​

​

1,422

Avision Holdings, LLC (d/b/a Avision Sales Group)

​

​

1,756

​

​

1,756

Camarillo Fitness Holdings, LLC (f/k/a Honors Holdings, LLC)

​

​

818

​

​

—

Impact Advisors, LLC

​

​

2,333

​

​

—

Kelso Industries LLC

​

​

994

​

​

1,389

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

​

731

​

​

—

Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)

​

​

861

​

​

861

SCIC Buyer, Inc. (d/b/a Sigma Corporation)

​

​

1,920

​

​

—

Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)

​

​

878

​

​

878

TOT Group, Inc. (d/b/a Netevia Group LLC)

​

​

553

​

​

1,107

Trailhead Media LLC

​

​

—

​

​

2,174

W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)

​

​

1,288

​

​

1,288

Total unfunded delayed draw loan commitments

​

​

13,554

​

​

10,875

Total Unfunded Commitments

​

$

31,914

​

$

26,385

​

​

As of March 31, 2025 and December 31, 2024, the Company had commitments to fund equity interests and subordinated notes in STRS JV of $23,000 and $92,000, respectively, of which $1,896 and $7,584 were unfunded, respectively. The capital commitments cannot be drawn without an affirmative vote by both the Company’s and STRS Ohio’s representatives on STRS JV’s board of managers.

Indemnification: In the normal course of business, the Company enters into contracts and agreements that contain a variety of representations and warranties that provide general indemnifications. The Company’s maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Company that have not occurred. The Company expects the risk of any future obligation under these indemnifications to be remote.

Legal Proceedings: In the normal course of business, the Company, WhiteHorse Advisers and WhiteHorse Administrator may be subject to legal and regulatory proceedings that are generally incidental to its ongoing operations. While there can be no assurance of the ultimate disposition of any such proceedings, the Company does not believe any such disposition will have a material adverse effect on the Company’s consolidated financial statements.
v3.25.1
STOCKHOLDERS' EQUITY
 3 Months Ended
Mar. 31, 2025
STOCKHOLDERS' EQUITY  
STOCKHOLDERS' EQUITY

NOTE 9 - STOCKHOLDERS’ EQUITY

On March 31, 2023, the Company launched an “at-the-market” offering (the “ATM Program”) by entering into an Equity Distribution Agreement with B. Riley Securities, Inc. pursuant to which the Company may offer and sell, from time to time, through B. Riley Securities, Inc., as the sales agent, shares of its common stock having an aggregate offering amount of up to $35,000.

​

No shares were issued pursuant to the ATM program during the three months ended March 31, 2025 and 2024, respectively.

v3.25.1
FINANCIAL HIGHLIGHTS
 3 Months Ended
Mar. 31, 2025
FINANCIAL HIGHLIGHTS  
FINANCIAL HIGHLIGHTS

NOTE 10 - FINANCIAL HIGHLIGHTS

The following is a schedule of financial highlights:

​

​

​

​

​

​

​

​

​

​

    

Three months ended March 31, 

​

​

    

2025

    

2024

    

Per share data:(1)

​

​

  

 

​

  

 

Net asset value, beginning of period

​

$

12.31

 

$

13.63

​

Net investment income

​

 

0.29

 

​

0.47

​

Net realized and unrealized gains (losses) on investments and foreign currency transactions

​

​

(0.10)

​

​

(0.21)

​

Net increase in net assets resulting from operations

​

 

0.19

 

​

0.26

​

Distributions declared from net investment income

​

 

(0.39)

 

​

(0.39)

​

Net asset value, end of period

​

$

12.11

 

$

13.50

​

Total annualized return based on market value(2)

​

 

(1.26)

%  

​

3.26

%  

Total annualized return based on net asset value

​

 

6.02

%  

​

7.50

%  

Net assets, end of period

​

$

281,449

​

$

313,792

​

Per share market value at end of period

​

$

9.65

​

$

12.40

​

Shares outstanding end of period

​

 

23,243,088

​

 

23,243,088

​

Ratios/Supplemental Data:(3)

​

 

  

​

 

  

​

Ratio of expenses before incentive fees to average net assets(4)

​

 

14.47

%  

 

15.03

%  

Ratio of incentive fees to average net assets

​

 

2.42

%  

 

3.40

%  

Ratio of total expenses to average net assets(4)

​

 

16.89

%  

 

18.43

%  

Ratio of net investment income to average net assets(4)

​

 

9.66

%  

 

13.60

%  

Portfolio turnover ratio

​

 

5.80

%  

 

7.87

%  

(1)Based on actual number of shares outstanding at the end of the period or the weighted average shares outstanding for the period, unless otherwise noted, as appropriate.
(2)Total return is based on the change in market price per share during the period and takes into account distributions, if any, reinvested in accordance with the DRIP.
(3)With the exception of the portfolio turnover rate, ratios are reported on an annualized basis.
(4)Calculated using total expenses, including income tax provision.

​

Financial highlights are calculated for each securities class taken as a whole. An individual stockholder’s return and ratios may vary based on the timing of capital transactions.
v3.25.1
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE
 3 Months Ended
Mar. 31, 2025
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE  
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE

NOTE 11 - CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE

The following information sets forth the computation of the basic and diluted per share net increase or decrease in net assets resulting from operations:

​

​

​

​

​

​

​

​

​

​

Three Months Ended March 31, 

($ in thousands except share and per share amounts)

    

2025

    

2024

Net increase (decrease) in net assets resulting from operations

​

$

4,264

​

$

5,969

Weighted average shares outstanding

​

 

23,243,088

​

 

23,243,088

Basic and diluted per share net increase (decrease) in net assets resulting from operations

​

$

0.18

​

$

0.26

​
v3.25.1
SEGMENT REPORTING
 3 Months Ended
Mar. 31, 2025
SEGMENT REPORTING  
SEGMENT REPORTING

NOTE 12 – SEGMENT REPORTING

The Company operates through a single reporting segment, with an investment strategy to generate current income and, to a lesser extent, capital appreciation primarily through direct origination of senior secured debt and select equity investments. The Chief Operating Decision Maker (“CODM”), who are the Company’s chief executive officer and chief financial officer, are responsible for assessing performance and allocating resources on behalf of the Company. The CODM assesses performance and makes operating decisions of the Company on a consolidated basis primarily based on the Company’s net increase (decrease) in net assets resulting from operations. In addition to various other factors and metrics, the CODM utilizes net increase (decrease) in net assets resulting from operations as a key metric in implementing investment policy decisions and in evaluating the Company’s distribution policy. As the Company operates as a single reporting segment, the segment assets are reflected on the accompanying consolidated statement of assets and liabilities as “total assets” and the significant segment expenses are listed on the accompanying consolidated statement of operations.
v3.25.1
SUBSEQUENT EVENTS
 3 Months Ended
Mar. 31, 2025
SUBSEQUENT EVENTS  
SUBSEQUENT EVENTS

NOTE 13 - SUBSEQUENT EVENTS

Management has evaluated events that have occurred after the balance sheet date but before the consolidated financial statements are issued and has determined that there were no additional subsequent events requiring adjustment or disclosure in the consolidated financial statements.

​

​
v3.25.1
Pay vs Performance Disclosure - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pay vs Performance Disclosure    
Net Income (Loss) $ 4,264 $ 5,969
v3.25.1
Insider Trading Arrangements
 3 Months Ended
Mar. 31, 2025
Trading Arrangements, by Individual  
Rule 10b5-1 Arrangement Adopted false
Non-Rule 10b5-1 Arrangement Adopted false
Rule 10b5-1 Arrangement Terminated false
Non-Rule 10b5-1 Arrangement Terminated false
v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)
 3 Months Ended
Mar. 31, 2025
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES  
Basis of Presentation

Basis of Presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of WhiteHorse Finance and its wholly owned subsidiaries, WhiteHorse Finance Credit I, LLC (“WhiteHorse Credit”), and its subsidiary WhiteHorse Finance (CA), LLC (“WhiteHorse California”), WHF American Craft Blocker, LLC, WhiteHorse RCKC Holdings, LLC, WhiteHorse Finance Holdings, LLC and WhiteHorse Finance CLO I, LLC. The Company meets the definition of an investment company under Accounting Standards Codification (“ASC”) Topic 946, Financial Services - Investment Companies, and therefore applies the accounting and reporting guidance discussed therein to its consolidated financial statements. The classifications included in the consolidated schedule of investments represent, in management’s opinion, as to the most meaningful presentation of the Company’s investment portfolio. All significant intercompany balances and transactions have been eliminated.

Additionally, the accompanying consolidated financial statements and related financial information have been prepared pursuant to the requirements for reporting on Form 10-Q and Articles 6, 10 and 12 of Regulation S-X. In the opinion of management, the consolidated financial statements reflect all adjustments, consisting solely of normal recurring accruals considered necessary for the fair presentation of financial results as of and for the periods presented.
Principles of Consolidation

Principles of Consolidation: Under the investment company rules and regulations pursuant to ASC Topic 946, WhiteHorse Finance is precluded from consolidating any entity other than another investment company. As provided under ASC Topic 946, WhiteHorse Finance generally consolidates any investment company when it owns 100% of its partners’ or members’ capital or equity units. The Company does not consolidate its investment in STRS JV or any of its controlled affiliate investments. See further description in Note 4.
Use of Estimates

Use of Estimates: The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the financial statements. Actual results could differ from those estimates.
Fair Value of Financial Instruments

Fair Value of Financial Instruments: The Company determines the fair value of its financial instruments in accordance with ASC Topic 820, Fair Value Measurements and Disclosures. ASC Topic 820 defines fair value,

establishes a framework used to measure fair value and requires disclosures for fair value measurements. In accordance with ASC Topic 820, the Company has categorized its financial instruments carried at fair value, based on the priority of the valuation technique, into a three-level fair value hierarchy. Fair value is a market-based measure considered from the perspective of the market participant who holds the financial instrument. Therefore, when market assumptions are not readily available, the Company’s own assumptions are set to reflect those that management believes market participants would use in pricing the financial instrument at the measurement date.

The Company values its investments in accordance with the 1940 Act and Rule 2a-5 thereunder, which sets forth the requirements for determining fair value in good faith. Pursuant to Rule 2a-5, the board of directors has designated the Investment Adviser to determine the fair value of the Company’s investments. The board of directors oversees the Investment Adviser’s performance of its valuation responsibilities, and in support of this oversight, the Investment Adviser provides periodic reports to the Company’s board of directors related to the fair valuation process. The Investment Adviser carries out its responsibilities as valuation designee primarily through its valuation committee (the “Valuation Committee”), assisted by third-party valuation firms, administrative personnel, and other service providers, as appropriate. The Valuation Committee consists of a number of representatives from different functions of the Investment Adviser. The Investment Adviser conducts the fair valuation process on a quarterly basis, subject to the oversight of the Company’s board of directors through the audit committee, using consistently applied valuation procedures. In accordance with the Company’s valuation procedures, the Investment Adviser performs periodic testing of the appropriateness and accuracy of fair value methodologies, and has established a process for approving, monitoring, and evaluating independent pricing service providers. Effective September 8, 2022, the board of directors designated the Investment Adviser as the Company’s valuation designee.

Investments that are not publicly traded or for which market prices are not readily available are valued based on the input of the Investment Adviser and independent third-party valuation firms engaged to review Company investments. These external reviews are used by the Company’s Investment Adviser, subject to the oversight of the board of directors, to review the Company’s internal valuation of investments during the year.
Investment Transactions

Investment Transactions: The Company records investment transactions on a trade date basis. These transactions may settle subsequent to the trade date depending on the transaction type. Certain expenses related to legal and tax consultation, due diligence, rating fees, valuation expenses and independent collateral appraisals may arise when the Company makes certain investments. These expenses are recognized in the consolidated statements of operations as they are incurred.
Foreign currency translation

Foreign currency translation: The Company’s books and records are maintained in U.S. dollars. Any foreign currency amounts are translated into U.S. dollars on the following basis:

(1)cash and cash equivalents, restricted cash and cash equivalents, fair value of investments, interest receivable, and other assets and liabilities — at the spot exchange rate on the last business day of the period; and
(2)purchases and sales of investments, income and expenses — at the exchange rates prevailing on the respective dates of such transactions.

Although net assets and fair values are presented based on the applicable foreign exchange rates described above, the Company does not isolate that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in fair values of investments held. Such fluctuations are included with the net realized and unrealized gain or loss from investments. Fluctuations arising from the translation of assets other than investments and liabilities are included with the net change in unrealized appreciation (depreciation) on translation of assets and liabilities in foreign currencies on the consolidated statements of operations.

Foreign security and currency transactions may involve certain considerations and risks not typically associated with investing in U.S. companies. These risks include, but are not limited to, currency fluctuations and revaluations and future adverse political, social and economic developments, which could cause investments in foreign markets to be less liquid and prices to be more volatile than those of comparable U.S. companies or U.S. government securities.
Revenue Recognition

Revenue Recognition: The Company’s revenue recognition policies are as follows:

Sales: Realized gains or losses on the sales of investments are calculated by using the specific identification method.

Investment Income: Interest income, adjusted for amortization of premium and accretion of discount, is recorded on an accrual basis. The Company may also receive closing, commitment, prepayment, amendment and other fees from portfolio companies in the ordinary course of business.

Dividend income is recorded on the record date for private portfolio companies or on the ex-dividend date for publicly traded portfolio companies.

Closing fees associated with investments in portfolio companies are deferred and recognized as interest income over the respective terms of the applicable loans. Upon the prepayment of a loan or debt security, any unamortized loan closing fees are recorded as part of interest income. Commitment fees are based upon the undrawn portion committed by the Company and are recorded as interest income on an accrual basis. Prepayment, amendment and other fees are recognized when earned, generally when such fees are receivable, and are included in fee income on the consolidated statements of operations.

The Company may invest in loans that contain a PIK interest rate provision. PIK interest is accrued at the contractual rates and added to loan principal on the reset dates to the extent such amounts are expected to be collected.

Non-accrual loans: Loans are placed on non-accrual status when principal or interest payments are past due 30 days or more or when there is reasonable doubt that principal or interest will be collected. The Company may conclude that non-accrual status is not required if the loan has sufficient collateral value and is in the process of collection. Accrued interest is generally reversed when a loan is placed on non-accrual status. Interest payments received on non-accrual loans may be recognized as income or applied to principal depending upon management’s judgment. Non-accrual loans are restored to accrual status when past due principal and interest is paid and, in management’s judgment, are likely to remain current.
Cash and Cash Equivalents

Cash and Cash Equivalents: Cash and cash equivalents include cash, deposits with financial institutions, and short-term liquid investments in money market funds with original maturities of three months or less.

Restricted Cash and Cash Equivalents

Restricted Cash and Cash Equivalents: Restricted cash and cash equivalents include amounts that are collected and held by the Administrative Agent (as defined in Note 6) appointed as custodian of the assets securing the Credit Facility (as defined in Note 6). Restricted cash is held by the trustee for the payment of interest expense and principal on the outstanding borrowings or reinvestment into new assets. Restricted cash that represents interest or fee income is transferred to unrestricted cash accounts by the trustee generally once a quarter after the payment of operating expenses and amounts due under the Credit Facility.
Offering Costs

Offering Costs: The Company may incur legal, accounting, regulatory, investment banking and other costs in relation to equity offerings. Offering costs are deferred and charged against paid-in capital in excess of par on completion of the related offering.
Deferred Financing Costs

Deferred Financing Costs: Deferred financing costs represent fees and other direct incremental costs incurred in connection with the Company’s borrowings. These amounts are amortized and are included in interest expense in the consolidated statements of operations over the estimated life of the borrowings. Deferred financing costs are presented in the consolidated statements of assets and liabilities as a direct reduction from the carrying amount of the related debt liability.
Income Taxes

​

Income Taxes: The Company elected to be treated as a RIC under Subchapter M of the Code. In order to maintain its status as a RIC, among other requirements, the Company is required to distribute dividends for U.S. federal income tax purposes to its stockholders each taxable year generally of an amount at least equal to 90% of the sum of ordinary income and realized net short-term capital gains in excess of realized net long-term capital losses, if any, out of the assets legally available for distribution. In addition, the Company will incur a nondeductible excise tax equal to 4% of the amount by which (1) 98% of ordinary income for the calendar year (taking into account certain deferrals and elections), (2) 98.2% of capital gains in excess of capital losses, adjusted for certain ordinary losses, for the one-year period ending on October 31 of the calendar year and (3) any ordinary income and capital gain income for preceding years that were not distributed during such years and on which the Company incurred no U.S. federal income tax exceed distributions for the year. The Company accrues estimated excise tax on the amount, if any, that estimated taxable income is expected to exceed the level of stockholder distributions described above.

The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statement is the largest benefit or expense that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. Any tax positions not deemed to satisfy the more-likely-than-not threshold are reversed and recorded as tax benefit or tax expense, as appropriate, in the current year. Management has analyzed the Company’s tax positions, and the Company has concluded that the Company did not have any unrecognized tax benefits or unrecognized tax liabilities related to uncertain tax positions as of March 31, 2025 and December 31, 2024.

Penalties or interest that may be assessed related to any income taxes would be classified as general and administrative expenses on the consolidated statements of operations. The Company had no amounts accrued for interest or penalties as of March 31, 2025 or December 31, 2024. The Company does not expect the total amount of unrecognized tax benefits to significantly change in the next twelve months. The Company’s tax returns are subject to examination by federal, state and local taxing authorities. Because many types of transactions are susceptible to varying interpretations under U.S. federal and state income tax laws and regulations, the amounts reported in the accompanying consolidated financial statements may be subject to change at a later date by the respective taxing authorities. Tax returns for each of the federal tax years since 2021 remain subject to examination by the Internal Revenue Service.

As of March 31, 2025 and December 31, 2024, the cost of investments for federal income tax purposes was $753,288 and $711,668 resulting in net unrealized depreciation of $87,967 and $56,206, respectively. This is comprised of gross unrealized appreciation of $9,618 and $13,700 and gross unrealized depreciation of $97,585 and $69,906, on a tax basis, as of March 31, 2025 and December 31, 2024, respectively.
Dividends and Distributions

Dividends and Distributions: Dividends and distributions to common stockholders are recorded on the ex-dividend date. Quarterly distribution payments are determined by the Company’s board of directors and are paid from taxable earnings estimated by management and may include a return of capital and/or capital gains. Net realized capital gains, if any, are distributed at least annually, although the Company may decide to retain such capital gains for investment.

The Company maintains an “opt out” dividend reinvestment plan (“DRIP”) for common stockholders. As a result, if the Company declares a distribution or other dividend, stockholders’ cash distributions will be automatically reinvested in additional shares of common stock, unless they specifically “opt out” of the DRIP so as to receive cash distributions.
Earnings per Share

Earnings per Share: The Company calculates earnings per share as earnings available to stockholders divided by the weighted average number of shares outstanding during the period.
Risks and Uncertainties

Risks and Uncertainties: In the normal course of business, the Company generally encounters two significant types of economic risks, including credit and market. Credit risk is the risk of default on the Company’s investments that result from an issuer’s, borrower’s or derivative counterparty’s inability or unwillingness to make contractually required payments. Market risk reflects changes in the value of investments due to changes in interest rates, spreads or other market factors, including the value of the collateral underlying investments held by the Company. Management believes

that the carrying value of the Company’s investments are fairly stated, taking into consideration these risks along with estimated collateral values, payment histories and other market information.
Reclassifications

Reclassifications: Certain amounts in the consolidated financial statements have been reclassified. These reclassifications had no material impact on the Company’s consolidated financial position, results of operations or cash flows as previously reported.
Segment Reporting

Segment Reporting: In accordance with ASC Topic 280, Segment Reporting, or ASC 280, the Company has determined that it has a single operating and reporting segment. As a result, the Company’s segment accounting policies are the same as described herein and the Company does not have any intra-segment sales and transfers of assets.
Recent Accounting Pronouncements

Recent Accounting Pronouncements: In November 2024, the Financial Accounting Standards Board issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), which requires public business entities to disclose, in interim and annual reporting periods, additional information about certain expenses in the notes to financial statements. The objective of this guidance is to enhance transparency and comparability by providing more detailed disaggregation of expenses presented in the income statement. The guidance is effective for annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. The Company is currently evaluating the impact of the adoption of ASU 2024-03 on its consolidated financial statements.
v3.25.1
FORWARD CURRENCY CONTRACTS (Tables)
 3 Months Ended
Mar. 31, 2025
FORWARD CURRENCY CONTRACTS  
Schedule of forward currency contracts

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31, 

($ in thousands)

​

​

2025

​

​

2024

Realized gain (loss) on forward currency contracts

​

$

22

​

$

(28)

Unrealized appreciation (depreciation) on forward currency contracts

​

​

(20)

​

​

52

Total net realized and unrealized gains (losses) on forward currency contracts

​

$

2

​

$

24

​

​

​

​

​

​

​
Schedule of unrealized appreciation or depreciation on forward currency contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

796

CAD

​

$

574

USD

​

2/4/2025

​

$

20

​

$

—

Total

​

​

​

​

​

​

​

​

​

​

​

$

20

​

$

—
Schedule of notional exposure to foreign currency forward contracts

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31,

​

Average USD notional outstanding

    

​

2025

​

​

2024

    

Forward currency contracts

​

$

247

​

$

1,105

​
Schedule of master netting agreement

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2024

Counterparty ($ in thousands)

    

Derivative Assets
Subject to Master
Netting Agreement

    

Derivative
Liabilities Subject
to Master Netting
Agreement

    

Derivatives
 Available for
Offset

    

Non-cash
Collateral
Received

    

Non-cash
Collateral
Pledged(1)

    

Cash Collateral
Received(1)

    

Cash Collateral
Pledged(1)

    

Net Amount of
Derivative
Assets(2)

    

Net Amount of
Derivative
Liabilities(3)

Morgan Stanley (CAD)

​

$

20

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

20

​

$

—

Total

​

$

20

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

20

​

$

—

(1)In some instances, the actual amount of the collateral received and/or pledged may be more than the amount shown due to overcollateralization.
(2)Net amount of derivative assets represents the net amount due from the counterparty to the Company in the event of default.
(3)Net amount of derivative liabilities represents the net amount due from the Company to the counterparty in the event of default.
v3.25.1
INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2025
Schedule of Investments [Line Items]  
Schedule of individual investments

Investments consisted of the following:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of March 31, 2025

​

As of December 31, 2024

​

    

Amortized Cost

    

Fair Value

    

Amortized Cost

    

Fair Value

First lien secured loans

​

$

553,887

​

$

516,563

​

$

538,078

​

$

502,693

Second lien secured loans

​

 

3,442

​

 

3,442

​

 

8,295

​

 

8,342

Unsecured loans

​

​

1,180

​

 

1,202

​

​

1,152

​

 

1,175

Subordinated Note to STRS JV

​

 

84,416

​

 

84,416

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

42,195

​

 

23,077

​

 

42,195

​

 

22,846

Equity in STRS JV

​

 

21,104

​

 

22,299

​

 

21,104

​

 

22,741

Total

​

$

706,224

​

$

650,999

​

$

695,240

​

$

642,213

​

​

The following table shows the portfolio composition by industry grouping at fair value:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Industry ($ in thousands)

​

As of March 31, 2025

​

As of December 31, 2024

​

Advertising

    

$

1,771

    

0.3

%  

$

17,451

    

3.3

%

Air Freight & Logistics

​

​

29,076

​

5.3

​

​

28,518

​

5.3

​

Application Software

​

​

26,439

​

4.9

​

​

26,924

​

5.0

​

Broadcasting

​

​

7,516

​

1.4

​

​

7,833

​

1.5

​

Broadline Retail

​

​

4,856

​

0.9

​

​

5,336

​

1.0

​

Building Products

​

​

22,483

​

4.1

​

​

13,206

​

2.5

​

Commodity Chemicals

​

​

22,951

​

4.2

​

​

16,026

​

3.0

​

Construction & Engineering

​

​

11,877

​

2.2

​

​

3,927

​

0.7

​

Construction Materials

​

​

5,668

​

1.0

​

​

5,640

​

1.1

​

Data Processing & Outsourced Services

​

​

27,986

​

5.1

​

​

28,572

​

5.3

​

Distributors

​

​

10,563

​

1.9

​

​

10,690

​

2.0

​

Diversified Chemicals

​

​

5,664

​

1.0

​

​

4,999

​

0.9

​

Diversified Support Services

​

​

9,725

​

1.8

​

​

9,563

​

1.8

​

Education Services

​

​

20,918

​

3.8

​

​

21,314

​

4.0

​

Electric Utilities

​

​

16,042

​

2.9

​

​

16,032

​

3.0

​

Environmental & Facilities Services

​

​

1,434

​

0.3

​

​

1,400

​

0.3

​

Food Distributors

​

​

331

​

0.1

​

​

350

​

0.1

​

Health Care Facilities

​

​

8,573

​

1.6

​

​

8,660

​

1.6

​

Health Care Services

​

​

19,539

​

3.6

​

​

19,589

​

3.7

​

Health Care Supplies

​

​

19,163

​

3.5

​

​

19,535

​

3.7

​

Health Care Technology

​

​

4,158

​

0.8

​

​

—

​

—

​

Heavy Electrical Equipment

​

​

9,704

​

1.8

​

​

10,138

​

1.9

​

Home Furnishings

​

​

25,237

​

4.6

​

​

25,376

​

4.7

​

Household Appliances

​

​

20,379

​

3.7

​

​

22,162

​

4.1

​

Household Products

​

​

10,989

​

2.0

​

​

11,656

​

2.2

​

Human Resource & Employment Services

​

​

2,912

​

0.5

​

​

—

​

—

​

Industrial Machinery & Supplies & Components

​

​

13,316

​

2.4

​

​

13,237

​

2.5

​

Integrated Telecommunication Services

​

​

13,104

​

2.4

​

​

13,135

​

2.5

​

Interactive Media & Services

​

​

15,990

​

2.9

​

​

15,970

​

3.0

​

IT Consulting & Other Services

​

​

3,181

​

0.6

​

​

3,504

​

0.6

​

Leisure Facilities

​

​

20,765

​

3.8

​

​

19,580

​

3.7

​

Leisure Products

​

​

23,451

​

4.3

​

​

23,298

​

4.4

​

Life Sciences Tools & Services

​

​

—

​

—

​

​

5,000

​

0.9

​

Packaged Foods & Meats

​

​

4,138

​

0.8

​

​

4,087

​

0.7

​

Paper Products

​

​

9,450

​

1.7

​

​

9,453

​

1.8

​

Real Estate Services

​

​

20,591

​

3.8

​

​

20,872

​

3.9

​

Research & Consulting Services

​

​

5,263

​

1.0

​

​

5,295

​

0.9

​

Security & Alarm Services

​

​

7,052

​

1.4

​

​

7,070

​

1.3

​

Specialized Consumer Services

​

​

7,036

​

1.4

​

​

7,122

​

1.3

​

Specialized Finance(1)

​

​

—

​

—

​

​

—

​

—

​

Systems Software

​

​

26,460

​

4.9

​

​

26,398

​

4.9

​

Technology Hardware, Storage & Peripherals

​

​

18,443

​

3.4

​

​

18,072

​

3.4

​

Transaction & Payment Processing Services

​

​

10,090

​

1.9

​

​

8,066

​

1.5

​

Total(1)

​

$

544,284

​

100.0

%

$

535,056

​

100.0

%

(1)Excludes investments in STRS JV.
The following table presents the schedule of investments in and advances to affiliated and controlled persons (as defined by the 1940 Act) as of and for the three months ended March 31, 2025:
Schedule of forward currency contracts

Forward Currency Contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold (purchased)

​

    

Currency to be purchased (sold)

​

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

631

CAD

​

$

492

USD

​

5/7/25

​

$

—

​

$

—

Morgan Stanley

​

€

773

EUR

​

$

950

USD

​

5/7/25

​

​

—

​

​

(31)

Total

​

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(31)

(1)Except as noted, all investments provide collateral for the STRS JV Credit Facility and are domiciled in the United States.
(2)The investments bear interest at a rate that may be determined by reference to SOFR, CORRA, SONIA, Prime, EurIBOR, which resets monthly, quarterly or semiannually. The one, three and six-month SOFR were 4.3%, 4.3% and 4.2%, respectively as of March 31, 2025. The Prime was 7.5% as of March 31, 2025. The CORRA was 2.8% as of March 31, 2025.
(3)The interest rate is the “all-in-rate” including the current index and spread, the fixed rate, and the PIK interest rate, as the case may be.
(4)Except as otherwise noted, all of STRS JV’s portfolio company investments, which as of the date of the portfolio represented 914.0% of STRS JV’s members’ equity or 95.9% of STRS JV’s total assets, are subject to legal restrictions on sales.
(5)The fair value of each investment was determined using significant unobservable inputs.
(6)The investment or a portion of the investment does not provide collateral for the STRS JV Credit Facility.
(7)The issuer is domiciled in Canada.
(8)Principal amount is denominated in GBP and the issuer is domiciled in the United Kingdom.
(9)Principal amount is denominated in EUR.
(10) Principal amount is denominated in CAD.
(11)The investment was comprised of two contracts, which were indexed to Prime and a different base rate, SOFR, SONIA or CORRA. The Floor, Spread Above Index and Interest Rate presented represent the weighted average of both contracts.
(12)The rate shown is the annualized seven-day yield as of March 31, 2025.
(13)Investment is structured as a unitranche loan in which the STRS JV may receive additional interest on its “last out” tranche of the portfolio company’s senior term debt, which was previously syndicated into “first out” and “last out” tranches, whereby the “first out” tranche will have priority as to the “last out” tranche with respect to payments of principal, interest and any other amounts due thereunder.

Forward Currency Contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold (purchased)

​

    

Currency to be purchased (sold)

​

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

681

CAD

​

$

492

USD

​

2/4/25

​

$

—

​

$

17

Morgan Stanley

​

€

870

EUR

​

$

950

USD

​

2/4/25

​

​

—

​

​

47

Total

​

​

​

​

​

​

​

​

​

​

​

$

—

​

$

64

​

(1)Except as noted, all investments provide collateral for the STRS JV Credit Facility and are domiciled in the United States.
(2)The investments bear interest at a rate that may be determined by reference SOFR, CORRA, SONIA, Prime, EurIBOR, which resets monthly, quarterly or semiannually.
(3)The interest rate is the “all-in-rate” including the current index and spread, the fixed rate, and the PIK interest rate, as the case may be.
(4)Except as otherwise noted, all of the STRS JV’s portfolio company investments, which as of the date of the portfolio represented 852.3% of STRS JV’s members’ equity or 95.4% of STRS JV’s total assets, are subject to legal restrictions on sales.
(5)The fair value of each investment was determined using significant unobservable inputs.
(6)The investment or a portion of the investment does not provide collateral for the STRS JV Credit Facility.
(7)The issuer is domiciled in Canada.
(8)Principal amount is denominated in GBP and the issuer is domiciled in the United Kingdom.
(9)Principal amount is denominated in Euros.
(10) Principal amount is denominated in CAD.
(11)The investment was comprised of two contracts, which were indexed to Prime and a different base rate, SOFR, SONIA or CORRA. The Floor, Spread Above Index and Interest Rate presented represent the weighted average of both contracts.
(12)The rate shown is the annualized seven-day yield as of December 31, 2024.
(13)Investment is structured as a unitranche loan in which the STRS JV may receive additional interest on its “last out” tranche of the portfolio company’s senior term debt, which was previously syndicated into “first out” and “last out” tranches, whereby the “first out” tranche will have priority as to the “last out” tranche with respect to payments of principal, interest and any other amounts due thereunder.
Schedule of selected Balance Sheet Information

​

​

​

​

​

​

​

​

Selected Balance Sheet Information ($ in thousands)

​

As of March 31, 2025

​

As of December 31, 2024

Assets

 

​

  

 

​

  

Investments, at fair value (amortized cost of $311,375 and $296,752 respectively)

​

$

310,160

​

$

294,957

Cash and cash equivalents

​

 

11,151

​

 

12,454

Interest receivable

​

​

1,862

​

​

1,427

Amounts receivable on unsettled investment transactions

​

​

288

​

​

143

Unrealized appreciation on foreign currency forward contracts

​

​

—

​

​

64

Other assets

​

 

55

​

 

32

Total assets

​

$

323,516

​

$

309,077

Liabilities

​

 

  

​

 

  

Credit facility (net of unamortized debt issuance costs of $2,889 and $3,024, respectively)

​

$

156,171

​

$

141,057

Note payable to members

​

 

128,459

​

 

128,459

Interest payable on credit facility

​

 

838

​

 

807

Interest payable on notes to members

​

 

3,475

​

 

3,589

Unrealized depreciation on foreign currency forward contracts

​

​

31

​

​

—

Other liabilities

​

 

607

​

 

558

Total liabilities

​

 

289,581

​

 

274,470

Members’ equity

​

 

33,935

​

 

34,607

Total liabilities and members’ equity

​

$

323,516

​

$

309,077
Schedule of selected Statement of Operations Information

​

​

​

​

​

​

​

​

​

​

Three Months Ended

Selected Statement of Operations Information ($ in thousands)

    

March 31, 2025

    

March 31, 2024

Interest and fee income

​

$

8,535

​

$

10,089

Total investment income

​

$

8,535

​

$

10,089

Interest expense on credit facility

​

 

3,009

​

 

3,756

Interest expense on notes to members

​

 

3,475

​

 

3,800

Administrative fee

​

 

155

​

 

162

Other expenses

​

 

156

​

 

216

Total expenses

​

$

6,795

​

$

7,934

Net investment income

​

 

1,740

​

 

2,155

Net realized gains (losses) on investments and foreign currency transactions

​

 

65

​

 

(112)

Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions

​

 

(375)

​

 

1,187

Net increase in members’ equity resulting from operations

​

$

1,430

​

$

3,230

​
STRS JV  
Schedule of Investments [Line Items]  
Schedule of individual investments

Below is a listing of STRS JV’s individual investments as of March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Debt Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Advertising

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

11.20%

​

02/18/22

​

12/15/26

​

8,984

​

$

8,923

​

$

8,984

​

26.6

%

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

11.20%

​

03/11/22

​

12/15/26

​

3,016

​

​

2,995

​

​

3,016

​

8.9

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

11.20%

​

02/18/22

​

12/15/26

​

—

​

​

—

​

​

4

​

—

​

Trailhead Media LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.80% (9.05% Cash + 0.75% PIK)

​

01/22/25

​

12/28/29

​

6,644

​

​

6,549

​

​

6,558

​

19.3

​

Trailhead Media LLC(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.80% (9.05% Cash + 0.75% PIK)

​

01/22/25

​

12/28/29

​

—

​

​

—

​

​

4

​

—

​

Trailhead Media LLC(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.80% (9.05% Cash + 0.75% PIK)

​

01/22/25

​

12/28/29

​

—

​

​

—

​

​

1

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,467

​

​

18,567

​

54.8

​

Aerospace & Defense

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

09/13/24

​

12/05/28

​

3,672

​

​

3,626

​

​

3,694

​

11.0

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

09/13/24

​

12/05/28

​

—

​

​

—

​

​

16

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,626

​

​

3,710

​

11.0

​

Air Freight & Logistics

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

10.05%

​

02/17/22

​

06/15/26

​

3,298

​

​

3,281

​

​

3,300

​

9.7

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

10.05%

​

02/17/22

​

06/15/26

​

—

​

​

—

​

​

3

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,281

​

​

3,303

​

9.7

​

Broadline Retail

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

18,613

​

​

18,595

​

​

17,869

​

52.7

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

—

​

​

—

​

​

(38)

​

(0.1)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,595

​

​

17,831

​

52.6

​

Building Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Drew Foam Companies Inc

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.45%

​

11/09/20

​

12/07/26

​

13,465

​

​

13,416

​

​

13,372

​

39.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

13,416

​

​

13,372

​

39.4

​

Construction & Engineering

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.57%

​

12/21/23

​

01/02/29

​

3,014

​

​

2,958

​

​

2,941

​

8.7

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.57%

​

12/21/23

​

01/02/29

​

1,909

​

​

1,874

​

​

1,863

​

5.5

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.57%

​

12/21/23

​

01/02/29

​

—

​

​

—

​

​

(6)

​

—

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

01/28/25

​

02/08/29

​

5,104

​

​

5,009

​

​

5,101

​

15.0

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

01/29/25

​

02/07/29

​

568

​

​

558

​

​

568

​

1.7

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

01/29/25

​

02/07/29

​

246

​

​

241

​

​

250

​

0.7

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

06/14/24

​

05/31/29

​

5,336

​

​

5,247

​

​

5,365

​

15.8

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

19

​

0.1

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.55%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

12

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

15,887

​

​

16,113

​

47.5

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Data Processing & Outsourced Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Term Loan

​

1.00%

​

CORRA

​

6.00%

​

8.98%

​

01/22/20

​

12/21/26

​

18,279

​

$

14,135

​

​

12,703

​

37.4

%

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

6.00%

​

8.98%

​

01/22/20

​

12/21/26

​

—

​

​

—

​

​

1

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,135

​

​

12,704

​

37.4

​

Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.06%

​

04/26/24

​

04/16/30

​

4,080

​

​

4,028

​

​

4,070

​

12.0

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.75%

​

10.06%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

14

​

—

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.06%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

5

​

—

​

FloWorks International LLC

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

4.75%

​

9.07%

​

12/12/24

​

11/26/31

​

5,333

​

​

5,282

​

​

5,279

​

15.6

​

FloWorks International LLC(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

4.75%

​

9.07%

​

12/12/24

​

11/26/31

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

9,310

​

​

9,368

​

27.6

​

Diversified Support Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

6,908

​

​

6,796

​

​

6,973

​

20.5

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

—

​

​

—

​

​

16

​

—

​

Quest Events, LLC

​

First Lien Secured Term Loan

​

2.00%

​

SOFR

​

7.00%

​

11.56%

​

07/19/19

​

09/30/26

​

11,562

​

​

11,537

​

​

11,415

​

33.6

​

Quest Events, LLC(11)

​

First Lien Secured Revolving Loan

​

1.00%

​

Base Rate

​

6.25%

​

13.02%

​

07/19/19

​

09/30/26

​

412

​

​

411

​

​

406

​

1.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,744

​

​

18,810

​

55.3

​

Electrical Components & Equipment

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

12/03/24

​

11/04/30

​

3,522

​

​

3,472

​

​

3,472

​

10.2

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

12/03/24

​

11/04/30

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,472

​

​

3,472

​

10.2

​

Environmental & Facilities Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.42%

​

10.84%

​

08/09/23

​

08/01/29

​

6,886

​

​

6,764

​

​

6,877

​

20.3

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/09/23

​

08/01/29

​

2,163

​

​

2,117

​

​

2,174

​

6.4

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/09/23

​

08/01/29

​

234

​

​

230

​

​

247

​

0.7

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.81%

​

03/01/22

​

12/29/26

​

11,049

​

​

10,981

​

​

11,049

​

32.6

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.81%

​

03/01/22

​

12/29/26

​

2,337

​

​

2,322

​

​

2,337

​

6.9

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.77%

​

03/01/22

​

12/29/26

​

517

​

​

514

​

​

521

​

1.5

​

RLJ Pro-Vac, Inc. (d/b/a Pro-Vac)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.71%

​

01/23/24

​

12/31/26

​

6,642

​

​

6,561

​

​

6,613

​

19.5

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

29,489

​

​

29,818

​

87.9

​

Food Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Clark Restaurant Service, LLC (d/b/a CRS OneSource)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.07%

​

06/14/24

​

05/10/29

​

4,994

​

​

4,911

​

​

4,981

​

14.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,911

​

​

4,981

​

14.7

​

Health Care Facilities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

5.00%

​

9.32%

​

09/19/24

​

07/02/31

​

7,946

​

​

7,854

​

​

7,964

​

23.5

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

5.00%

​

9.32%

​

09/19/24

​

07/02/31

​

348

​

​

345

​

​

358

​

1.1

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Revolving Loan

​

0.75%

​

SOFR

​

5.00%

​

9.32%

​

09/19/24

​

07/02/31

​

—

​

​

—

​

​

8

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

8,199

​

​

8,330

​

24.6

​

Health Care Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

04/11/23

​

03/01/29

​

4,989

​

​

4,891

​

​

5,039

​

14.8

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

04/11/23

​

03/01/29

​

—

​

​

—

​

​

10

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,891

​

​

5,049

​

14.8

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Health Care Supplies

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

4.75%

​

9.05%

​

10/25/23

​

10/18/28

​

4,959

​

$

4,871

​

$

4,963

​

14.6

%

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

4.75%

​

9.05%

​

10/25/23

​

10/18/28

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,871

​

​

4,972

​

14.6

​

Human Resource & Employment Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Infotree Holdco LLC (d/b/a Infotree Global Solutions LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.05%

​

03/24/25

​

02/19/30

​

2,545

​

​

2,496

​

​

2,496

​

7.4

​

Infotree Holdco LLC (d/b/a Infotree Global Solutions LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.05%

​

03/24/25

​

02/19/30

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

2,496

​

​

2,496

​

7.4

​

Household Appliances

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Smalto Inc. (d/b/a PEMCO International)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.36%

​

05/04/22

​

04/28/28

​

6,423

​

​

6,691

​

​

6,947

​

20.5

​

Smalto Inc. (d/b/a PEMCO International)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.20%

​

05/04/22

​

04/28/28

​

978

​

​

968

​

​

978

​

2.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,659

​

​

7,925

​

23.4

​

IT Consulting & Other Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.10% (9.85% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

3,341

​

​

3,312

​

​

3,341

​

9.8

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Term Loan

​

1.00%

​

SONIA

​

5.75%

​

10.32% (10.07% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

512

​

​

664

​

​

664

​

2.0

​

Cennox, Inc. (d/b/a Cennox)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.39% (8.14% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

593

​

​

648

​

​

636

​

1.9

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.12% (9.87% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

97

​

​

96

​

​

97

​

0.3

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Revolving Loan

​

1.00%

​

SONIA

​

5.75%

​

10.32% (10.07% Cash + 0.25% PIK)

​

09/11/24

​

05/04/29

​

—

​

​

—

​

​

2

​

—

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.39%

​

10.81%

​

05/10/23

​

04/10/29

​

7,169

​

​

7,030

​

​

7,162

​

21.1

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.97%

​

10.39%

​

05/10/23

​

04/10/29

​

1,332

​

​

1,305

​

​

1,325

​

3.9

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

Prime

​

5.50%

​

13.00%

​

05/10/23

​

04/10/28

​

241

​

​

236

​

​

248

​

0.7

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.00%

​

9.45%

​

01/27/21

​

01/02/29

​

10,894

​

​

10,816

​

​

10,894

​

32.1

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.00%

​

9.44%

​

01/27/21

​

01/02/29

​

2,938

​

​

2,916

​

​

2,938

​

8.7

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.00%

​

9.44%

​

01/27/21

​

01/02/29

​

—

​

​

—

​

​

10

​

—

​

Turnberry Solutions, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

08/10/21

​

09/02/26

​

5,949

​

​

5,915

​

​

5,949

​

17.5

​

Turnberry Solutions, Inc.

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

08/10/21

​

09/02/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

32,938

​

​

33,270

​

98.0

​

Personal Care Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

G-2 Lather Acquisition Corp. (d/b/a Creative Laboratories, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.00%

​

9.32%

​

03/05/25

​

01/31/31

​

3,929

​

​

3,872

​

​

3,872

​

11.4

​

G-2 Lather Acquisition Corp. (d/b/a Creative Laboratories, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.00%

​

9.32%

​

03/05/25

​

01/31/31

​

—

​

​

—

​

​

—

​

—

​

G-2 Lather Acquisition Corp. (d/b/a Creative Laboratories, Inc.)(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.00%

​

9.32%

​

03/05/25

​

01/31/31

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,872

​

​

3,872

​

11.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Paper & Plastic Packaging Products & Materials

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

LINC Systems, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.50%

​

12.96%

​

06/22/21

​

02/24/26

​

8,091

​

$

8,059

​

$

8,091

​

23.9

%

LINC Systems, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

8.50%

​

12.96%

​

06/22/21

​

02/24/26

​

—

​

​

—

​

​

3

​

—

​

Max Solutions, Inc.(13)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.11%

​

12.56%

​

10/07/22

​

09/29/28

​

6,504

​

​

6,428

​

​

6,344

​

18.7

​

Max Solutions, Inc.(13)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

8.10%

​

12.54%

​

10/07/22

​

09/29/28

​

413

​

​

410

​

​

403

​

1.2

​

Max Solutions, Inc.(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

8.10%

​

12.54%

​

10/07/22

​

09/29/28

​

—

​

​

—

​

​

(2)

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,897

​

​

14,839

​

43.8

​

Packaged Foods & Meats

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

PANOS Brands, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.07%

​

06/14/24

​

05/14/29

​

4,509

​

​

4,434

​

​

4,502

​

13.3

​

PANOS Brands, LLC(11)

​

First Lien Secured Revolving Loan

​

1.00%

​

Base Rate

​

5.42%

​

10.79%

​

06/14/24

​

05/14/29

​

91

​

​

90

​

​

97

​

0.3

​

TableTrust Brands LLC (d/b/a Hain Pure Protein Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.17%

​

12/24/24

​

06/28/28

​

2,499

​

​

2,464

​

​

2,469

​

7.3

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,988

​

​

7,068

​

20.9

​

Pharmaceuticals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.39%

​

12/16/21

​

11/01/27

​

12,008

​

​

13,431

​

​

12,965

​

38.2

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.42%

​

12/16/21

​

11/01/27

​

959

​

​

951

​

​

959

​

2.8

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

10.51%

​

12/16/21

​

11/01/27

​

871

​

​

864

​

​

871

​

2.6

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.44%

​

12/16/21

​

11/01/27

​

1,156

​

​

1,146

​

​

1,159

​

3.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,392

​

​

15,954

​

47.0

​

Real Estate Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.69%

​

12/28/21

​

10/19/26

​

5,551

​

​

5,517

​

​

5,386

​

15.9

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)(11)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

Base Rate

​

6.22%

​

11.01%

​

02/18/22

​

10/19/26

​

1,392

​

​

1,383

​

​

1,352

​

4.0

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.69%

​

02/18/22

​

10/19/26

​

602

​

​

599

​

​

573

​

1.7

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

03/01/22

​

01/21/27

​

6,454

​

​

6,407

​

​

5,876

​

17.3

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

03/01/22

​

01/21/27

​

725

​

​

720

​

​

660

​

1.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,626

​

​

13,847

​

40.8

​

Research & Consulting Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

6.00%

​

10.31%

​

01/10/24

​

11/21/29

​

3,608

​

​

3,538

​

​

3,566

​

10.5

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

6.00%

​

10.31%

​

01/10/24

​

11/21/29

​

—

​

​

—

​

​

(2)

​

—

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Revolving Loan

​

0.75%

​

Prime

​

5.00%

​

12.50%

​

01/10/24

​

11/21/28

​

142

​

​

139

​

​

143

​

0.4

​

E-Phoenix Acquisition Co. Inc. (d/b/a Integreon, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

07/15/21

​

06/23/27

​

8,320

​

​

8,281

​

​

8,320

​

24.5

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

11,958

​

​

12,027

​

35.4

​

Technology Hardware, Storage & Peripherals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/10/21

​

07/30/27

​

14,124

​

​

14,015

​

​

14,124

​

41.6

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

10.92%

​

08/10/21

​

07/30/27

​

3,862

​

​

3,832

​

​

3,862

​

11.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

17,847

​

​

17,986

​

53.0

​

Water Utilities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

The Crom Corporation

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

03/05/25

​

01/31/31

​

4,080

​

​

4,020

​

​

4,020

​

11.8

​

The Crom Corporation(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

03/05/25

​

01/31/31

​

—

​

​

—

​

​

—

​

—

​

The Crom Corporation(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.54%

​

03/05/25

​

01/31/31

​

144

​

​

142

​

​

142

​

0.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,162

​

​

4,162

​

12.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Wireless Telecommunication Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.82%

​

11/27/23

​

11/09/28

​

6,338

​

$

6,246

​

$

6,306

​

18.6

%

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.82%

​

11/27/23

​

11/09/28

​

—

​

​

—

​

​

8

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,246

​

​

6,314

​

18.6

​

Total Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

311,375

​

$

310,160

​

914.0

%

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds (included in cash and cash equivalents and restricted cash and cash equivalents)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Goldman Sachs Money Market Fund (CUSIP: 38141W315)(12)

​

​

​

​

​

​

​

​

​

4.19%

​

​

​

​

​

​

​

$

279

​

$

279

​

0.8

%

JPMORGAN U.S. Treas Plus Money Market Fund (Ticker: AJTXX)(12)

​

​

​

​

​

​

​

​

​

4.22%

​

​

​

​

​

​

​

​

746

​

​

746

​

2.2

​

Total Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

1,025

​

​

1,025

​

3.0

​

Total Investments and Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

312,400

​

$

311,185

​

917.0

%

Below is a listing of STRS JV’s individual investments as of December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Debt Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Advertising

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

02/18/22

​

12/15/26

​

9,007

​

$

8,937

​

$

9,007

​

26.1

%

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/11/22

​

12/15/26

​

3,023

​

​

3,000

​

​

3,023

​

8.7

​

Forward Solutions, LLC (d/b/a Avision Sales Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

02/18/22

​

12/15/26

​

—

​

​

—

​

​

5

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

11,937

​

​

12,035

​

34.8

​

Aerospace & Defense

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.94%

​

09/13/24

​

12/05/28

​

3,681

​

​

3,633

​

​

3,675

​

10.6

​

Basel U.S. Acquisition Co., Inc. (d/b/a International Aerospace Coatings, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.94%

​

09/13/24

​

12/05/28

​

—

​

​

—

​

​

7

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,633

​

​

3,682

​

10.6

​

Air Freight & Logistics

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

10.35%

​

02/17/22

​

06/15/26

​

3,307

​

​

3,286

​

​

3,307

​

9.6

​

ITS Buyer Inc. (d/b/a ITS Logistics, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

10.35%

​

02/17/22

​

06/15/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,286

​

​

3,311

​

9.6

​

Broadline Retail

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

18,613

​

​

18,577

​

​

17,865

​

51.6

​

Marlin DTC-LS Midco 2, LLC (d/b/a Clarus Commerce, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.03%

​

07/19/19

​

07/01/25

​

—

​

​

—

​

​

(38)

​

(0.1)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,577

​

​

17,827

​

51.5

​

Building Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Drew Foam Companies Inc

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.48%

​

11/09/20

​

12/07/26

​

13,501

​

​

13,445

​

​

13,437

​

38.8

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

13,445

​

​

13,437

​

38.8

​

Construction & Engineering

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.61%

​

12/21/23

​

01/02/29

​

3,033

​

​

2,974

​

​

2,981

​

8.6

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.59%

​

12/21/23

​

01/02/29

​

1,502

​

​

1,472

​

​

1,477

​

4.3

​

Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.61%

​

12/21/23

​

01/02/29

​

420

​

​

412

​

​

415

​

1.2

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/17/23

​

02/07/28

​

5,117

​

​

5,015

​

​

5,111

​

14.8

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/17/23

​

02/07/28

​

569

​

​

558

​

​

569

​

1.7

​

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

11.23%

​

03/17/23

​

02/07/28

​

338

​

​

331

​

​

341

​

1.0

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.83%

​

06/14/24

​

05/31/29

​

5,349

​

​

5,254

​

​

5,338

​

15.4

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.50%

​

9.83%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

9

​

—

​

TriplePoint Acquisition Holdings LLC (d/b/a TriplePoint MEP Holdings, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.83%

​

06/14/24

​

05/31/29

​

—

​

​

—

​

​

12

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,016

​

​

16,253

​

47.0

​

Data Processing & Outsourced Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Term Loan

​

1.00%

​

CORRA

​

6.00%

​

9.49%

​

01/22/20

​

12/21/26

​

18,415

​

​

14,234

​

​

12,883

​

37.2

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

6.00%

​

9.49%

​

01/22/20

​

12/21/26

​

—

​

​

—

​

​

2

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,234

​

​

12,885

​

37.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.40%

​

04/26/24

​

04/16/30

​

4,080

​

$

4,027

​

$

4,070

​

11.8

%

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.75%

​

10.40%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

15

​

—

​

APG Lions Purchaser, LLC (d/b/a CF Stinson, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.40%

​

04/26/24

​

04/16/30

​

—

​

​

—

​

​

6

​

—

​

FloWorks International LLC

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

4.75%

​

9.27%

​

12/12/24

​

11/26/31

​

5,333

​

​

5,280

​

​

5,281

​

15.3

​

FloWorks International LLC(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

5.75%

​

10.40%

​

12/12/24

​

11/26/31

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

9,307

​

​

9,372

​

27.1

​

Diversified Support Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

7,425

​

​

7,298

​

​

7,425

​

21.5

​

Pirtek Holdco, LLC (d/b/a Pirtek USA, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

9.95%

​

10/31/23

​

10/26/28

​

—

​

​

—

​

​

17

​

—

​

Quest Events, LLC

​

First Lien Secured Term Loan

​

2.00%

​

SOFR

​

7.00%

​

11.59%

​

07/19/19

​

09/30/26

​

11,592

​

​

11,563

​

​

11,592

​

33.5

​

Quest Events, LLC

​

First Lien Secured Revolving Loan

​

2.00%

​

SOFR

​

7.00%

​

11.59%

​

07/19/19

​

09/30/26

​

247

​

​

246

​

​

248

​

0.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

19,107

​

​

19,282

​

55.7

​

Electrical Components & Equipment

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.81%

​

12/03/24

​

11/04/30

​

3,531

​

​

3,479

​

​

3,479

​

10.1

​

Principal Lighting Group, LLC (d/b/a Principal Sloan)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.81%

​

12/03/24

​

11/04/30

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,479

​

​

3,479

​

10.1

​

Environmental & Facilities Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.42%

​

10.88%

​

08/09/23

​

08/01/29

​

6,904

​

​

6,774

​

​

6,952

​

20.1

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)(6)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.00%

​

8.45%

​

08/09/23

​

08/01/29

​

2,168

​

​

2,120

​

​

2,183

​

6.3

​

Buckeye Acquiror LLC (d/b/a Superior Environmental Solutions, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

08/09/23

​

08/01/29

​

234

​

​

230

​

​

248

​

0.7

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.84%

​

03/01/22

​

12/29/26

​

11,078

​

​

11,000

​

​

11,078

​

32.0

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

10.85%

​

03/01/22

​

12/29/26

​

2,343

​

​

2,326

​

​

2,343

​

6.8

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

10.82%

​

03/01/22

​

12/29/26

​

517

​

​

513

​

​

522

​

1.5

​

RLJ Pro-Vac, Inc. (d/b/a Pro-Vac)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

10.71%

​

01/23/24

​

12/31/26

​

6,659

​

​

6,566

​

​

6,637

​

19.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

29,529

​

​

29,963

​

86.6

​

Food Distributors

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Clark Restaurant Service, LLC (d/b/a CRS OneSource)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.11%

​

06/14/24

​

05/10/29

​

5,006

​

​

4,919

​

​

4,993

​

14.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,919

​

​

4,993

​

14.4

​

Health Care Facilities

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

5.25%

​

9.79%

​

09/19/24

​

07/02/31

​

7,962

​

​

7,866

​

​

7,919

​

22.9

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

5.25%

​

9.78%

​

09/19/24

​

07/02/31

​

78

​

​

78

​

​

80

​

0.2

​

AB Centers Acquisition Corporation (d/b/a AB Centers Acquisition Corp.)

​

First Lien Secured Revolving Loan

​

0.75%

​

SOFR

​

5.25%

​

9.78%

​

09/19/24

​

07/02/31

​

—

​

​

—

​

​

5

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,944

​

​

8,004

​

23.1

​

Health Care Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.46%

​

04/11/23

​

03/01/29

​

5,002

​

​

4,898

​

​

4,986

​

14.4

​

Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.46%

​

04/11/23

​

03/01/29

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,898

​

​

4,995

​

14.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Health Care Supplies

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.00%

​

9.33%

​

10/25/23

​

10/18/28

​

4,972

​

$

4,877

​

$

5,021

​

14.5

%

Arteriocyte Medical Systems, Inc. (d/b/a ISTO Biologics)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.00%

​

9.33%

​

10/25/23

​

10/18/28

​

—

​

​

—

​

​

9

​

—

​

Medical Device Inc. (d/b/a Arterex)

​

First Lien Secured Term Loan

​

1.25%

​

SOFR

​

6.25%

​

10.68%

​

07/27/23

​

07/11/29

​

2,633

​

​

2,584

​

​

2,660

​

7.7

​

Medical Device Inc. (d/b/a Arterex)

​

First Lien Secured Revolving Loan

​

1.25%

​

SOFR

​

6.25%

​

10.68%

​

07/27/23

​

07/11/29

​

—

​

​

—

​

​

6

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,461

​

​

7,696

​

22.2

​

Household Appliances

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Smalto Inc. (d/b/a PEMCO International)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.86%

​

05/04/22

​

04/28/28

​

6,423

​

​

6,682

​

​

6,654

​

19.2

​

Smalto Inc. (d/b/a PEMCO International)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.21%

​

05/04/22

​

04/28/28

​

978

​

​

967

​

​

978

​

2.8

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,649

​

​

7,632

​

22.0

​

IT Consulting & Other Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

10.34%

​

09/11/24

​

05/04/29

​

3,350

​

​

3,319

​

​

3,344

​

9.7

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Term Loan

​

1.00%

​

SONIA

​

5.50%

​

10.40%

​

09/11/24

​

05/04/29

​

513

​

​

665

​

​

643

​

1.9

​

Cennox, Inc. (d/b/a Cennox)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

5.75%

​

9.14%

​

09/11/24

​

05/04/29

​

594

​

​

649

​

​

611

​

1.8

​

Cennox, Inc. (d/b/a Cennox)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

10.25%

​

09/11/24

​

05/04/29

​

29

​

​

29

​

​

30

​

0.1

​

Cennox Holdings Limited (d/b/a Cennox)(8)

​

First Lien Secured Revolving Loan

​

1.00%

​

SONIA

​

5.50%

​

10.40%

​

09/11/24

​

05/04/29

​

—

​

​

—

​

​

2

​

—

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.39%

​

10.85%

​

05/10/23

​

04/10/29

​

7,187

​

​

7,040

​

​

7,176

​

20.7

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.97%

​

10.51%

​

05/10/23

​

04/10/29

​

821

​

​

804

​

​

817

​

2.4

​

MGT Merger Target, LLC (d/b/a MGT Consulting Group)

​

First Lien Secured Revolving Loan

​

1.00%

​

Prime

​

5.50%

​

13.00%

​

05/10/23

​

04/10/28

​

241

​

​

236

​

​

249

​

0.7

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.25%

​

9.73%

​

01/27/21

​

01/02/29

​

10,923

​

​

10,839

​

​

10,923

​

31.6

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

5.25%

​

9.99%

​

01/27/21

​

01/02/29

​

2,946

​

​

2,922

​

​

2,946

​

8.5

​

RCKC Acquisitions LLC (d/b/a KSM Consulting, LLC)(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.25%

​

9.99%

​

01/27/21

​

01/02/29

​

—

​

​

—

​

​

11

​

—

​

Turnberry Solutions, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.21%

​

08/10/21

​

09/02/26

​

5,964

​

​

5,924

​

​

5,964

​

17.2

​

Turnberry Solutions, Inc.

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.21%

​

08/10/21

​

09/02/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

32,427

​

​

32,720

​

94.6

​

Packaged Foods & Meats

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

PANOS Brands, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.13%

​

06/14/24

​

05/14/29

​

4,520

​

​

4,441

​

​

4,505

​

13.0

​

PANOS Brands, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

10.15%

​

06/14/24

​

05/14/29

​

30

​

​

30

​

​

36

​

0.1

​

TableTrust Brands LLC (d/b/a Hain Pure Protein Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

10.22%

​

12/24/24

​

06/28/28

​

2,505

​

​

2,468

​

​

2,468

​

7.1

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,939

​

​

7,009

​

20.2

​

Paper & Plastic Packaging Products & Materials

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

LINC Systems, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.50%

​

12.99%

​

06/22/21

​

02/24/26

​

8,155

​

​

8,114

​

​

8,155

​

23.7

​

LINC Systems, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

8.50%

​

12.99%

​

06/22/21

​

02/24/26

​

—

​

​

—

​

​

3

​

—

​

Max Solutions, Inc.(13)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

8.11%

​

12.57%

​

10/07/22

​

09/29/28

​

6,521

​

​

6,439

​

​

6,324

​

18.3

​

Max Solutions, Inc.(13)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

8.10%

​

12.56%

​

10/07/22

​

09/29/28

​

414

​

​

411

​

​

402

​

1.2

​

Max Solutions, Inc.(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CORRA

​

8.10%

​

12.56%

​

10/07/22

​

09/29/28

​

—

​

​

—

​

​

(3)

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,964

​

​

14,881

​

43.2

​

Pharmaceuticals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)(9)

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

8.85%

​

12/16/21

​

11/01/27

​

12,039

​

​

13,449

​

​

12,465

​

36.0

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

10.48%

​

12/16/21

​

11/01/27

​

962

​

​

952

​

​

962

​

2.8

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

10.51%

​

12/16/21

​

11/01/27

​

874

​

​

865

​

​

874

​

2.5

​

Meta Buyer LLC (d/b/a Metagenics, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

10.44%

​

12/16/21

​

11/01/27

​

1,156

​

​

1,145

​

​

1,160

​

3.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,411

​

​

15,461

​

44.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Issuer

    

Investment Type(1)

    

Floor

    

Reference Rate(2)

    

Spread
Above
Index

​

Interest
Rate(3)

    

Acquisition
Date(4)

    

Maturity
Date

    

Principal/
Share
Amount

    

Amortized
Cost

    

Fair
Value(5)

    

Fair Value As A
Percentage of Members' Equity

​

Real Estate Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

11.02%

​

12/28/21

​

10/19/26

​

5,563

​

$

5,523

​

$

5,395

​

15.6

%

HRG Management, LLC (d/b/a HomeRiver Group, LLC)(11)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

Base Rate

​

6.97%

​

11.29%

​

02/18/22

​

10/19/26

​

1,395

​

​

1,384

​

​

1,354

​

3.9

​

HRG Management, LLC (d/b/a HomeRiver Group, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

11.02%

​

02/18/22

​

10/19/26

​

483

​

​

480

​

​

455

​

1.3

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

03/01/22

​

01/21/27

​

6,502

​

​

6,448

​

​

5,918

​

17.1

​

NPAV Lessor Corp. (d/b/a Nationwide Property & Appraisal Services, LLC)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

03/01/22

​

01/21/27

​

725

​

​

719

​

​

660

​

1.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,554

​

​

13,782

​

39.8

​

Research & Consulting Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Term Loan

​

0.75%

​

SOFR

​

6.00%

​

10.51%

​

01/10/24

​

11/21/29

​

3,617

​

​

3,543

​

​

3,574

​

10.3

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)(6)

​

First Lien Secured Delayed Draw Loan

​

0.75%

​

SOFR

​

6.00%

​

10.51%

​

01/10/24

​

11/21/29

​

—

​

​

—

​

​

(2)

​

—

​

Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)

​

First Lien Secured Revolving Loan

​

0.75%

​

Prime

​

5.00%

​

12.50%

​

01/10/24

​

11/21/28

​

60

​

​

58

​

​

63

​

0.2

​

E-Phoenix Acquisition Co. Inc. (d/b/a Integreon, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

9.98%

​

07/15/21

​

06/23/27

​

8,342

​

​

8,299

​

​

8,342

​

24.1

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

11,900

​

​

11,977

​

34.6

​

Technology Hardware, Storage & Peripherals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

08/10/21

​

07/30/27

​

14,162

​

​

14,041

​

​

14,095

​

40.7

​

Source Code Holdings, LLC (d/b/a Source Code Corporation)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

10.96%

​

08/10/21

​

07/30/27

​

3,872

​

​

3,839

​

​

3,854

​

11.1

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

17,880

​

​

17,949

​

51.8

​

Wireless Telecommunication Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.02%

​

11/27/23

​

11/09/28

​

6,354

​

​

6,256

​

​

6,323

​

18.3

​

KORE Wireless Group Inc. (d/b/a KORE Group Holdings, Inc.)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.02%

​

11/27/23

​

11/09/28

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,256

​

​

6,332

​

18.3

​

Total Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

296,752

​

$

294,957

​

852.3

%

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Money market funds (included in cash and cash equivalents and restricted cash and cash equivalents)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Goldman Sachs Money Market Fund (CUSIP: 38141W315)(12)

​

​

​

​

​

​

​

​

​

4.33%

​

​

​

​

​

​

​

$

242

​

$

242

​

0.7

%

JPMORGAN U.S. Treas Plus Money Market Fund (Ticker: AJTXX)(12)

​

​

​

​

​

​

​

​

​

4.39%

​

​

​

​

​

​

​

​

525

​

​

525

​

1.5

​

Total Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

767

​

​

767

​

2.2

​

Total Investments and Money Market Funds

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

297,519

​

$

295,724

​

854.5

%
v3.25.1
FAIR VALUE MEASUREMENTS (Tables)
 3 Months Ended
Mar. 31, 2025
FAIR VALUE MEASUREMENTS  
Schedule of investments measured at fair value

The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Level 1

    

Level 2

    

Level 3

    

Total

First lien secured loans

​

$

—

​

$

—

​

$

516,563

​

$

516,563

Second lien secured loans

​

 

—

​

 

—

​

 

3,442

​

 

3,442

Unsecured loans

​

​

—

​

 

—

​

 

1,202

​

 

1,202

Subordinated Note to STRS JV

​

 

—

​

 

—

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

—

​

 

—

​

 

23,077

​

 

23,077

Equity in STRS JV(1)

​

 

—

​

 

—

​

 

—

​

 

22,299

Total investments

​

$

—

​

$

—

​

$

628,700

​

$

650,999

(1)The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities.

The following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Level 1

    

Level 2

    

Level 3

​

Total

First lien secured loans

​

$

—

​

$

—

​

$

502,693

​

$

502,693

Second lien secured loans

​

 

—

​

 

—

​

 

8,342

​

 

8,342

Unsecured loans

​

​

—

​

 

—

​

 

1,175

​

 

1,175

Subordinated Note to STRS JV

​

 

—

​

 

—

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

—

​

 

—

​

 

22,846

​

 

22,846

Equity in STRS JV(1)

​

 

—

​

 

—

​

 

—

​

 

22,741

Total investments

​

$

—

​

$

—

​

$

619,472

​

$

642,213

(1)The Company’s equity investment in STRS JV is measured using the net asset value per share as a practical expedient for fair value, and thus has not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statements of assets and liabilities.
Schedule of changes in investments measured at fair value using Level 3 inputs

The following table presents the changes in investments measured at fair value using Level 3 inputs for the three months ended March 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Three months ended March 31, 2025

​

Loans

​

Loans

​

Loans

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

502,693

 

$

8,342

 

$

1,175

 

$

84,416

 

$

22,846

​

$

619,472

Funding of investments

​

 

47,222

 

 

—

 

​

—

 

 

—

 

 

—

​

 

47,222

Non-cash interest income

​

 

564

 

 

100

 

​

27

 

 

—

 

 

—

​

 

691

Accretion of discount

​

 

892

 

 

47

 

​

1

 

 

—

 

 

—

​

 

940

Proceeds from paydowns and sales

​

 

(32,473)

 

 

(5,000)

 

​

—

 

 

—

 

 

—

​

 

(37,473)

Realized gains (losses)

​

 

(395)

 

 

—

 

​

—

 

 

—

 

 

—

​

 

(395)

Net unrealized appreciation (depreciation)

​

 

(1,940)

 

 

(47)

 

​

(1)

 

 

—

 

 

231

​

 

(1,757)

Fair value, end of period

​

$

516,563

 

$

3,442

 

$

1,202

 

$

84,416

 

$

23,077

​

$

628,700

Change in unrealized appreciation (depreciation) on investments still held as of March 31, 2025

​

$

(1,460)

​

$

—

​

$

(1)

​

$

—

​

$

231

​

$

(1,230)

​

The following table presents the changes in investments measured at fair value using Level 3 inputs for the three months ended March 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Three months ended March 31, 2024

​

Loans

​

Loans

​

Notes

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

555,878

 

$

16,246

 

$

167

 

$

84,416

 

$

16,679

​

$

673,386

Funding of investments

​

 

58,085

 

 

—

 

​

—

 

 

—

 

 

117

​

 

58,202

Non-cash interest income

​

 

2,016

 

 

—

 

​

16

 

 

—

 

 

—

​

 

2,032

Accretion of discount

​

 

1,100

 

 

15

 

​

1

 

 

—

 

 

—

​

 

1,116

Proceeds from paydowns and sales

​

 

(52,289)

 

 

(2,040)

 

​

—

 

 

—

 

 

—

​

 

(54,329)

Conversions

​

 

(8,852)

 

 

(11,769)

 

​

1,053

 

 

—

 

 

19,568

​

 

—

Realized gains (losses)

​

 

(331)

 

 

(5,817)

 

​

—

 

 

—

 

 

—

​

 

(6,148)

Net unrealized appreciation (depreciation)

​

 

6,662

 

 

8,313

 

​

2

 

 

—

 

 

(13,975)

​

 

1,002

Fair value, end of period

​

$

562,269

 

$

4,948

 

$

1,239

 

$

84,416

 

$

22,389

​

$

675,261

Change in unrealized appreciation (depreciation) on investments still held as of March 31, 2024

​

$

(2,738)

​

$

45

​

$

1

​

$

—

​

$

(13,978)

​

$

(16,670)
Schedule of Quantitative information about Level 3 fair value measurements

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Fair Value as of

​

Valuation

​

Unobservable

​

Range

Investment Type

​

​

March 31, 2025

​

Techniques

​

Inputs

​

(Weighted Average)(1)

First lien secured loans

​

$

443,843

​

Discounted cash flow analysis

​

Discount Rate

​

7.6% - 22.8% (12.5%)

​

​

​

37,962

​

Recent transaction

​

Transaction Price

​

75.0 - 99.5 (96.2)

​

​

​

33,104

​

Enterprise value analysis

​

EBITDA Multiple

​

4.5 - 8.0 (6.6)

​

​

​

1,601

​

Enterprise value analysis

​

Revenue Multiple

​

0.7 - 0.7 (0.7)

​

​

​

53

​

Option pricing Model

​

Volatility

​

20.0 - 20.0 (20.0)

Second lien secured loans

​

​

3,442

​

Discounted cash flow analysis

​

Discount rate

​

12.5% - 12.5% (12.5%)

Unsecured loans

​

​

1,202

​

Discounted cash flow analysis

​

Discount rate

​

12.3% - 13.0% (12.7%)

Subordinated Notes to STRS JV

​

​

84,416

​

Enterprise value analysis

​

n/a

​

n/a

Common equity

​

​

10,378

​

Enterprise value analysis

​

EBITDA multiple

​

5.3 - 12.4 (9.6)

​

​

​

9,121

​

Enterprise value analysis

​

Revenue Multiple

​

0.7 - 2.1 (2.1)

Preferred equity

​

​

3,464

​

Enterprise value analysis

​

EBITDA multiple

​

6.5 - 10.0 (6.9)

Warrant

​

​

114

​

Enterprise value analysis

​

EBITDA multiple

​

6.1 - 6.1 (6.1)

Total Level 3 Investments

​

$

628,700

​

​

​

​

​

​

(1)Unobservable inputs were weighted by the relative fair value of the investments.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Fair Value as of

​

Valuation

​

Unobservable

​

Range

Investment Type

​

​

December 31, 2024

​

Techniques

​

Inputs

​

(Weighted Average)(1)

First lien secured loans

​

$

439,577

​

Discounted cash flow analysis

​

Discount Rate

​

7.7% - 26.8% (13.1%)

​

​

​

19,554

​

Recent transaction

​

Transaction Price

​

98.0 - 100.0 (98.5)

​

​

​

22,923

​

Enterprise value analysis

​

EBITDA Multiple

​

5.8 - 8.0 (6.9)

​

​

​

1,635

​

Enterprise value analysis

​

Revenue Multiple

​

1.4 - 1.4 (1.4)

​

​

​

9,104

​

Expected repayment

​

Transaction Price

​

103.0 - 103.0 (103.0)

​

​

​

373

​

Collateral analysis

​

Recovery Rate

​

0.0 - 15.0 (15.0)

​

​

​

9,453

​

Market quotations

​

Broker quoted price

​

96.8 - 96.8 (96.8)

​

​

​

74

​

Option pricing Model

​

Volatility

​

16.0 - 16.0 (16.0)

Second lien secured loans

​

​

8,342

​

Discounted cash flow analysis

​

Discount rate

​

11.7% - 12.5% (12.0%)

Unsecured loans

​

​

1,175

​

Discounted cash flow analysis

​

Discount rate

​

12.3% - 12.9% (12.6%)

Subordinated Notes to STRS JV

​

​

84,416

​

Enterprise value analysis

​

n/a

​

n/a

Common equity

​

​

10,728

​

Enterprise value analysis

​

EBITDA multiple

​

5.3 - 13.7 (9.8)

​

​

​

9,132

​

Enterprise value analysis

​

Revenue Multiple

​

1.4 - 2.0 (2.0)

Preferred equity

​

​

2,916

​

Enterprise value analysis

​

EBITDA multiple

​

6.5 - 12.1 (7.5)

Warrant

​

​

70

​

Enterprise value analysis

​

EBITDA multiple

​

5.5 - 5.5 (5.5)

Total Level 3 Investments

​

$

619,472

​

​

​

​

​

​

(1)Unobservable inputs were weighted by the relative fair value of the investments.
Schedule of principal amount and fair value of the Company's borrowings

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of March 31, 2025

​

As of December 31, 2024

​

​

Fair

​

​

​

​

​

​

​

​

​

​

​

    

Value Level

    

Principal Amount Outstanding

    

Fair Value

    

Principal Amount Outstanding

    

Fair Value

JPM Credit Facility

 

3

​

$

170,136

​

$

168,547

​

$

161,493

​

$

160,745

5.375% 2025 Notes

 

3

​

 

40,000

​

 

39,815

​

​

40,000

​

 

39,594

5.375% 2026 Notes

​

3

​

​

10,000

​

​

9,865

​

 

10,000

​

​

9,765

4.000% 2026 Notes

 

3

​

 

75,000

​

 

72,319

​

 

75,000

​

 

71,342

5.625% 2027 Notes

 

3

​

 

10,000

​

 

9,850

​

​

10,000

​

 

9,719

4.250% 2028 Notes

​

3

​

​

25,000

​

 

23,382

​

​

25,000

​

 

22,911

7.875% 2028 Notes

​

3

​

​

34,500

​

​

34,500

​

​

34,500

​

​

34,500

​

​

​

​

$

364,636

​

$

358,278

​

$

355,993

​

$

348,576

​
v3.25.1
BORROWINGS (Tables)
 3 Months Ended
Mar. 31, 2025
BORROWINGS  
Schedule of borrowings outstanding and available

Total borrowings outstanding and available as of March 31, 2025, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Maturity

    

Rate

    

Principal Amount Outstanding

    

Amortized Cost

    

Available

JPM Credit Facility(1)

 

1/17/2030

 

S+2.250

%  

$

170,136

​

$

168,547

​

$

164,864

5.375% 2025 Notes

 

10/20/2025

 

5.375

%  

 

40,000

​

 

39,925

​

 

—

5.375% 2026 Notes

 

12/4/2026

 

5.375

%  

 

10,000

​

 

9,951

​

 

—

4.000% 2026 Notes

 

12/15/2026

 

4.000

%  

 

75,000

​

 

74,417

​

 

—

5.625% 2027 Notes

 

12/4/2027

 

5.625

%  

 

10,000

​

 

9,933

​

 

—

4.250% 2028 Notes

​

12/6/2028

​

4.250

%  

​

25,000

​

​

24,809

​

​

—

7.875% 2028 Notes

​

9/15/2028

​

7.875

%  

​

34,500

​

​

33,551

​

​

—

Total debt

 

​

​

​

​

$

364,636

​

$

361,133

​

$

164,864

(1)All foreign denominated principal borrowings have been converted to USD using the exchange rates as of the applicable reporting date.

​

Total borrowings outstanding and available as of December 31, 2024, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Maturity

    

Rate

    

Principal Amount Outstanding

    

Amortized Cost

    

Available

JPM Credit Facility(1)

 

11/22/2025

 

S+2.500

%  

$

161,493

​

$

160,745

​

$

173,507

5.375% 2025 Notes

 

10/20/2025

 

5.375

%  

 

40,000

​

 

39,892

​

 

—

5.375% 2026 Notes

 

12/4/2026

 

5.375

%  

 

10,000

​

 

9,943

​

 

—

4.000% 2026 Notes

 

12/15/2026

 

4.000

%  

 

75,000

​

 

74,332

​

 

—

5.625% 2027 Notes

 

12/4/2027

 

5.625

%  

 

10,000

​

 

9,926

​

 

—

4.250% 2028 Notes

​

12/6/2028

​

4.250

%  

​

25,000

​

​

24,796

​

​

—

7.875% 2028 Notes

​

9/15/2028

​

7.875

%  

​

34,500

​

​

33,483

​

​

—

Total debt

 

​

​

​

​

$

355,993

​

$

353,117

​

$

173,507

(1)All foreign denominated principal borrowings have been converted to USD using the exchange rates as of the applicable reporting date.
v3.25.1
RELATED PARTY TRANSACTIONS (Tables)
 3 Months Ended
Mar. 31, 2025
RELATED PARTY TRANSACTIONS  
Schedule of management fee expenses

The following table details management fee expenses for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31, 

​

Management Fees ($ in thousands)

    

​

2025

​

​

2024

    

Base management fees

​

$

2,833

​

$

3,116

​

Total management fees

​

$

2,833

​

$

3,116

​
Schedule of performance-based incentive fees

The following table provides a breakdown of the performance-based incentive fees for the three months ended March 31, 2025 and 2024:

​

​

​

​

​

​

​

​

​

​

​

Three months ended March 31, 

​

Performance-based Incentive Fees ($ in thousands)

    

​

2025

​

​

2024

    

Income incentive fee

​

$

1,711

​

$

2,704

​

Capital gains incentive fee

​

​

—

​

​

—

​

Total performance-based incentive fees

​

$

1,711

​

$

2,704

​
v3.25.1
COMMITMENTS AND CONTINGENCIES (Tables)
 3 Months Ended
Mar. 31, 2025
COMMITMENTS AND CONTINGENCIES  
Schedule of unfunded commitments

​

​

​

​

​

​

​

​

Unfunded Commitments ($ in thousands)

    

As of March 31, 2025

    

As of December 31, 2024

Revolving Loan Commitments:

​

​

​

​

​

​

Bridgepoint Healthcare, LLC

​

$

1,350

​

$

1,350

BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)

​

​

643

​

​

459

Claridge Products and Equipment, LLC

​

​

70

​

​

70

Coastal Television Broadcasting Group LLC

​

​

309

​

​

309

EducationDynamics, LLC

​

​

1,199

​

​

1,199

ELM One Call Locators, Inc. (d/b/a One Call Locators, Ltd.)

​

​

900

​

​

—

Gulf Winds International Acquisition LLC (d/b/a Gulf Winds International, Inc.)

​

​

—

​

​

194

Impact Advisors, LLC

​

​

467

​

​

—

Infotree Holdco LLC (d/b/a Infotree Global Solutions LLC)

​

​

530

​

​

—

Leviathan Intermediate Holdco, LLC

​

​

418

​

​

570

LogicMonitor, Inc.

​

​

778

​

​

778

Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)

​

​

343

​

​

246

M&M OpCo, LLC (d/b/a Escalent, Inc.)

​

​

238

​

​

238

PANOS Brands, LLC

​

​

329

​

​

384

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

​

7

​

​

—

Quest Events, LLC

​

​

35

​

​

—

Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)

​

​

880

​

​

880

Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)

​

​

861

​

​

861

SCIC Buyer, Inc. (d/b/a Sigma Corporation)

​

​

1,625

​

​

—

Sleep OpCo LLC (d/b/a Brooklyn Bedding LLC)

​

​

2,646

​

​

2,646

Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)

​

​

—

​

​

146

Telestream Holdings Corporation

​

​

241

​

​

241

The Kyjen Company, LLC (d/b/a Outward Hound)

​

​

422

​

​

—

TOT Group, Inc. (d/b/a Netevia Group LLC)

​

​

553

​

​

553

Trailhead Media LLC

​

​

—

​

​

870

W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)

​

​

515

​

​

515

W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)

​

​

1,195

​

​

1,195

Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC)

​

​

1,806

​

​

1,806

Total unfunded revolving loan commitments

​

​

18,360

​

​

15,510

​

​

​

​

​

​

​

Delayed Draw Loan Commitments:

​

​

​

​

​

​

Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)

​

​

1,422

​

​

1,422

Avision Holdings, LLC (d/b/a Avision Sales Group)

​

​

1,756

​

​

1,756

Camarillo Fitness Holdings, LLC (f/k/a Honors Holdings, LLC)

​

​

818

​

​

—

Impact Advisors, LLC

​

​

2,333

​

​

—

Kelso Industries LLC

​

​

994

​

​

1,389

Pavement Partners Interco, LLC (d/b/a Pave America, LLC)

​

​

731

​

​

—

Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)

​

​

861

​

​

861

SCIC Buyer, Inc. (d/b/a Sigma Corporation)

​

​

1,920

​

​

—

Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)

​

​

878

​

​

878

TOT Group, Inc. (d/b/a Netevia Group LLC)

​

​

553

​

​

1,107

Trailhead Media LLC

​

​

—

​

​

2,174

W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)

​

​

1,288

​

​

1,288

Total unfunded delayed draw loan commitments

​

​

13,554

​

​

10,875

Total Unfunded Commitments

​

$

31,914

​

$

26,385

​
v3.25.1
FINANCIAL HIGHLIGHTS (Tables)
 3 Months Ended
Mar. 31, 2025
FINANCIAL HIGHLIGHTS  
Schedule of financial highlights

​

​

​

​

​

​

​

​

​

​

    

Three months ended March 31, 

​

​

    

2025

    

2024

    

Per share data:(1)

​

​

  

 

​

  

 

Net asset value, beginning of period

​

$

12.31

 

$

13.63

​

Net investment income

​

 

0.29

 

​

0.47

​

Net realized and unrealized gains (losses) on investments and foreign currency transactions

​

​

(0.10)

​

​

(0.21)

​

Net increase in net assets resulting from operations

​

 

0.19

 

​

0.26

​

Distributions declared from net investment income

​

 

(0.39)

 

​

(0.39)

​

Net asset value, end of period

​

$

12.11

 

$

13.50

​

Total annualized return based on market value(2)

​

 

(1.26)

%  

​

3.26

%  

Total annualized return based on net asset value

​

 

6.02

%  

​

7.50

%  

Net assets, end of period

​

$

281,449

​

$

313,792

​

Per share market value at end of period

​

$

9.65

​

$

12.40

​

Shares outstanding end of period

​

 

23,243,088

​

 

23,243,088

​

Ratios/Supplemental Data:(3)

​

 

  

​

 

  

​

Ratio of expenses before incentive fees to average net assets(4)

​

 

14.47

%  

 

15.03

%  

Ratio of incentive fees to average net assets

​

 

2.42

%  

 

3.40

%  

Ratio of total expenses to average net assets(4)

​

 

16.89

%  

 

18.43

%  

Ratio of net investment income to average net assets(4)

​

 

9.66

%  

 

13.60

%  

Portfolio turnover ratio

​

 

5.80

%  

 

7.87

%  

(1)Based on actual number of shares outstanding at the end of the period or the weighted average shares outstanding for the period, unless otherwise noted, as appropriate.
(2)Total return is based on the change in market price per share during the period and takes into account distributions, if any, reinvested in accordance with the DRIP.
(3)With the exception of the portfolio turnover rate, ratios are reported on an annualized basis.
(4)Calculated using total expenses, including income tax provision.
v3.25.1
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Tables)
 3 Months Ended
Mar. 31, 2025
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE  
Schedule of computation of basic and diluted per share net increase in net assets resulting from operations

​

​

​

​

​

​

​

​

​

​

Three Months Ended March 31, 

($ in thousands except share and per share amounts)

    

2025

    

2024

Net increase (decrease) in net assets resulting from operations

​

$

4,264

​

$

5,969

Weighted average shares outstanding

​

 

23,243,088

​

 

23,243,088

Basic and diluted per share net increase (decrease) in net assets resulting from operations

​

$

0.18

​

$

0.26

​
v3.25.1
ORGANIZATION (Details)
 3 Months Ended
Mar. 31, 2025
Minimum  
Debt Instrument [Line Items]  
Term of interest 3 years
Maximum  
Debt Instrument [Line Items]  
Term of interest 6 years
v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Percentage of investment owned 100.00%  
Unrecognized tax benefits $ 0 $ 0
Accrued for interest or penalties 0 0
Cost of investments for U.S. federal income tax purpose 753,288,000 711,668,000
Net unrealized depreciation 87,967,000 56,206,000
Gross unrealized appreciation of investments 9,618,000 13,700,000
Gross unrealized depreciation of investments $ 97,585,000 $ 69,906,000
v3.25.1
FORWARD CURRENCY CONTRACTS - Forward Currency Contracts (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
FORWARD CURRENCY CONTRACTS    
Realized gain (loss) on forward currency contracts $ (29) $ 9
Foreign currency forward contracts    
FORWARD CURRENCY CONTRACTS    
Realized gain (loss) on forward currency contracts 22 (28)
Unrealized appreciation (depreciation) on forward currency contracts (20) 52
Total net realized and unrealized gains (losses) on forward currency contracts $ 2 $ 24
v3.25.1
FORWARD CURRENCY CONTRACTS - Unrealized Appreciation or Depreciation On Forward Currency Contracts (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Fair value    
Unrealized appreciation $ 20  
Foreign currency forward contracts    
Fair value    
Derivative, Number of Instruments Held   0
Morgan Stanley    
Fair value    
Unrealized appreciation $ 20  
Morgan Stanley | CAD    
Fair value    
Currency to be sold 796  
Unrealized appreciation $ 20  
Morgan Stanley | USD    
Fair value    
Currency to be purchased 574  
v3.25.1
FORWARD CURRENCY CONTRACTS - Notional Exposure to Foreign Currency Forward Contracts (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
FORWARD CURRENCY CONTRACTS    
Forward currency contracts $ (20) $ 52
Foreign currency forward contracts    
FORWARD CURRENCY CONTRACTS    
Forward currency contracts $ 247 $ 1,105
v3.25.1
FORWARD CURRENCY CONTRACTS - Collateral Received or Pledged (Details) - Foreign currency forward contracts
$ in Thousands
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
FORWARD CURRENCY CONTRACTS    
Derivative Assets Subject to Master Netting Agreement   $ 20
Net Amount of Derivative Assets   20
Derivative, Number of Instruments Held 0  
Morgan Stanley | CAD    
FORWARD CURRENCY CONTRACTS    
Derivative Assets Subject to Master Netting Agreement   20
Net Amount of Derivative Assets   $ 20
v3.25.1
INVESTMENTS - Schedule of Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investments, amortized cost $ 706,224 $ 695,240
Investments, fair value 650,999 642,213
First lien secured loans    
Investments, amortized cost 553,887 538,078
Investments, fair value 516,563 502,693
Second lien secured loans    
Investments, amortized cost 3,442 8,295
Investments, fair value 3,442 8,342
Subordinated Notes    
Investments, amortized cost 1,180 1,152
Investments, fair value 1,202 1,175
Subordinated Note to STRS JV    
Investments, amortized cost 84,416 84,416
Investments, fair value 84,416 84,416
Equity (excluding STRS JV)    
Investments, amortized cost 42,195 42,195
Investments, fair value 23,077 22,846
Equity in STRS JV    
Investments, amortized cost 21,104 21,104
Investments, fair value $ 22,299 $ 22,741
v3.25.1
INVESTMENTS - Portfolio by Industry Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investments, fair value $ 650,999 $ 642,213
Percent of net assets 231.30% 224.40%
Advertising    
Investments, fair value $ 18,567 $ 12,035
Air Freight & Logistics    
Investments, fair value 3,303 3,311
Broadline Retail    
Investments, fair value 17,831 17,827
Building Products    
Investments, fair value 13,372 13,437
Construction & Engineering    
Investments, fair value 16,113 16,253
Data Processing & Outsourced Services    
Investments, fair value 12,704 12,885
Distributors    
Investments, fair value 9,368 9,372
Diversified Support Services    
Investments, fair value 18,810 19,282
Environmental & Facilities Services    
Investments, fair value 29,818 29,963
Food Distributors    
Investments, fair value 4,981 4,993
Health Care Facilities    
Investments, fair value 8,330 8,004
Health Care Services    
Investments, fair value 5,049 4,995
Health Care Supplies    
Investments, fair value 4,972 7,696
Household Appliances    
Investments, fair value 7,925 7,632
Human Resource & Employment Services    
Investments, fair value 2,496  
Packaged Foods & Meats    
Investments, fair value 7,068 7,009
Research & Consulting Services    
Investments, fair value 12,027 11,977
Technology Hardware, Storage & Peripherals    
Investments, fair value 17,986 17,949
Investments Excluding STRS JV's    
Investments, fair value $ 544,284 $ 535,056
Percent of net assets 100.00% 100.00%
Investments Excluding STRS JV's | Advertising    
Investments, fair value $ 1,771 $ 17,451
Percent of net assets 0.30% 3.30%
Investments Excluding STRS JV's | Air Freight & Logistics    
Investments, fair value $ 29,076 $ 28,518
Percent of net assets 5.30% 5.30%
Investments Excluding STRS JV's | Application Software    
Investments, fair value $ 26,439 $ 26,924
Percent of net assets 4.90% 5.00%
Investments Excluding STRS JV's | Broadcasting    
Investments, fair value $ 7,516 $ 7,833
Percent of net assets 1.40% 1.50%
Investments Excluding STRS JV's | Broadline Retail    
Investments, fair value $ 4,856 $ 5,336
Percent of net assets 0.90% 1.00%
Investments Excluding STRS JV's | Building Products    
Investments, fair value $ 22,483 $ 13,206
Percent of net assets 4.10% 2.50%
Investments Excluding STRS JV's | Commodity Chemicals    
Investments, fair value $ 22,951 $ 16,026
Percent of net assets 4.20% 3.00%
Investments Excluding STRS JV's | Construction & Engineering    
Investments, fair value $ 11,877 $ 3,927
Percent of net assets 2.20% 0.70%
Investments Excluding STRS JV's | Construction Materials    
Investments, fair value $ 5,668 $ 5,640
Percent of net assets 1.00% 1.10%
Investments Excluding STRS JV's | Data Processing & Outsourced Services    
Investments, fair value $ 27,986 $ 28,572
Percent of net assets 5.10% 5.30%
Investments Excluding STRS JV's | Distributors    
Investments, fair value $ 10,563 $ 10,690
Percent of net assets 1.90% 2.00%
Investments Excluding STRS JV's | Diversified Chemicals    
Investments, fair value $ 5,664 $ 4,999
Percent of net assets 1.00% 0.90%
Investments Excluding STRS JV's | Diversified Support Services    
Investments, fair value $ 9,725 $ 9,563
Percent of net assets 1.80% 1.80%
Investments Excluding STRS JV's | Education Services    
Investments, fair value $ 20,918 $ 21,314
Percent of net assets 3.80% 4.00%
Investments Excluding STRS JV's | Electric Utilities    
Investments, fair value $ 16,042 $ 16,032
Percent of net assets 2.90% 3.00%
Investments Excluding STRS JV's | Environmental & Facilities Services    
Investments, fair value $ 1,434 $ 1,400
Percent of net assets 0.30% 0.30%
Investments Excluding STRS JV's | Food Distributors    
Investments, fair value $ 331 $ 350
Percent of net assets 0.10% 0.10%
Investments Excluding STRS JV's | Health Care Facilities    
Investments, fair value $ 8,573 $ 8,660
Percent of net assets 1.60% 1.60%
Investments Excluding STRS JV's | Health Care Services    
Investments, fair value $ 19,539 $ 19,589
Percent of net assets 3.60% 3.70%
Investments Excluding STRS JV's | Health Care Supplies    
Investments, fair value $ 19,163 $ 19,535
Percent of net assets 3.50% 3.70%
Investments Excluding STRS JV's | Health Care Technology    
Investments, fair value $ 4,158  
Percent of net assets 0.80%  
Investments Excluding STRS JV's | Heavy Electrical Equipment    
Investments, fair value $ 9,704 $ 10,138
Percent of net assets 1.80% 1.90%
Investments Excluding STRS JV's | Home Furnishings    
Investments, fair value $ 25,237 $ 25,376
Percent of net assets 4.60% 4.70%
Investments Excluding STRS JV's | Household Appliances    
Investments, fair value $ 20,379 $ 22,162
Percent of net assets 3.70% 4.10%
Investments Excluding STRS JV's | Household Products    
Investments, fair value $ 10,989 $ 11,656
Percent of net assets 2.00% 2.20%
Investments Excluding STRS JV's | Human Resource & Employment Services    
Investments, fair value $ 2,912  
Percent of net assets 0.50%  
Investments Excluding STRS JV's | Industrial Machinery & Supplies & Components    
Investments, fair value $ 13,316 $ 13,237
Percent of net assets 2.40% 2.50%
Investments Excluding STRS JV's | Integrated Telecommunication Services    
Investments, fair value $ 13,104 $ 13,135
Percent of net assets 2.40% 2.50%
Investments Excluding STRS JV's | Interactive Media & Services    
Investments, fair value $ 15,990 $ 15,970
Percent of net assets 2.90% 3.00%
Investments Excluding STRS JV's | IT Consulting & Other Services    
Investments, fair value $ 3,181 $ 3,504
Percent of net assets 0.60% 0.60%
Investments Excluding STRS JV's | Leisure Facilities    
Investments, fair value $ 20,765 $ 19,580
Percent of net assets 3.80% 3.70%
Investments Excluding STRS JV's | Leisure Products    
Investments, fair value $ 23,451 $ 23,298
Percent of net assets 4.30% 4.40%
Investments Excluding STRS JV's | Life Sciences Tools & Services    
Investments, fair value   $ 5,000
Percent of net assets   0.90%
Investments Excluding STRS JV's | Packaged Foods & Meats    
Investments, fair value $ 4,138 $ 4,087
Percent of net assets 0.80% 0.70%
Investments Excluding STRS JV's | Paper Products    
Investments, fair value $ 9,450 $ 9,453
Percent of net assets 1.70% 1.80%
Investments Excluding STRS JV's | Real Estate Services    
Investments, fair value $ 20,591 $ 20,872
Percent of net assets 3.80% 3.90%
Investments Excluding STRS JV's | Research & Consulting Services    
Investments, fair value $ 5,263 $ 5,295
Percent of net assets 1.00% 0.90%
Investments Excluding STRS JV's | Security & Alarm Services    
Investments, fair value $ 7,052 $ 7,070
Percent of net assets 1.40% 1.30%
Investments Excluding STRS JV's | Specialized Consumer Services    
Investments, fair value $ 7,036 $ 7,122
Percent of net assets 1.40% 1.30%
Investments Excluding STRS JV's | Systems Software    
Investments, fair value $ 26,460 $ 26,398
Percent of net assets 4.90% 4.90%
Investments Excluding STRS JV's | Technology Hardware, Storage & Peripherals    
Investments, fair value $ 18,443 $ 18,072
Percent of net assets 3.40% 3.40%
Investments Excluding STRS JV's | Transaction & Payment Processing Services    
Investments, fair value $ 10,090 $ 8,066
Percent of net assets 1.90% 1.50%
v3.25.1
INVESTMENTS - Affiliated and Controlled Persons (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Sep. 30, 2024
Investments in and Advances to Affiliates [Line Items]        
Weighted average remaining term of debt investments 2 years 10 months 24 days   3 years  
Cost basis of non-accrual loans $ 79,597   $ 69,576  
Fair value of non-accrual loans 45,864   37,019  
Cost of investment 706,224   695,240  
Schedule of investments in and advances to affiliated and controlled persons        
Beginning Fair Value 642,213      
Net Change in Unrealized Appreciation (Depreciation) (2,198) $ 434    
Ending Fair Value 650,999   642,213  
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 345   $ 78  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 80      
Ending Fair Value $ 358   $ 80  
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 5      
Ending Fair Value 8   $ 5  
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7,854   $ 7,866  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,919      
Ending Fair Value 7,964   $ 7,919  
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 20,163   $ 20,142  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ABBCon-ciseOpticalGroupLLCMember   whfcl:ABBCon-ciseOpticalGroupLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 19,535      
Ending Fair Value $ 19,163   $ 19,535  
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 15      
Ending Fair Value $ 14   $ 15  
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 6      
Ending Fair Value 5   $ 6  
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,028   $ 4,027  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,070      
Ending Fair Value 4,070   $ 4,070  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,656   $ 1,615  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 1,456      
Ending Fair Value 1,479   $ 1,456  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Four        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,262   $ 2,330  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 74      
Ending Fair Value 53   $ 74  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Three        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,050   $ 9,318  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,990      
Ending Fair Value 3,637   $ 3,990  
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Two        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,011   $ 1,029  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 451      
Ending Fair Value $ 418   $ 451  
Investment, Identifier [Axis]: American Crafts Holdings, LLC, Warrants        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsHoldingsLlcMember   whfcl:AmericanCraftsHoldingsLlcMember  
Investment type Warrant   Warrant  
Investment, Identifier [Axis]: American Crafts Lc Super Priority First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,094   $ 2,094  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember  
Investment type whfcl:SuperPriorityFirstLienSecuredTermLoanMember   whfcl:SuperPriorityFirstLienSecuredTermLoanMember  
Dividends, interest and PIK included in income     $ 187  
Beginning Fair Value   1,878 1,878  
Gross Additions     191  
Net Change in Unrealized Appreciation (Depreciation)     (2,069)  
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,458   $ 1,458  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value   93 $ 93  
Net Change in Unrealized Appreciation (Depreciation)     (93)  
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,720   $ 8,720  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value   553 $ 553  
Net Change in Unrealized Appreciation (Depreciation)     (553)  
Investment, Identifier [Axis]: American Crafts, LC Priority First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,105   $ 5,105  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember  
Investment type whfcl:PriorityFirstLienSecuredTermLoanMember   whfcl:PriorityFirstLienSecuredTermLoanMember  
Dividends, interest and PIK included in income     $ (10)  
Beginning Fair Value   3,226 3,226  
Net Change in Unrealized Appreciation (Depreciation)     (3,226)  
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,374   $ 2,374  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember  
Investment type whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember  
Dividends, interest and PIK included in income     $ 107  
Beginning Fair Value $ 373      
Gross Additions     2,374  
Net Change in Unrealized Appreciation (Depreciation) (373)   (2,001)  
Ending Fair Value     373  
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan one        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,230   $ 1,230  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember  
Investment type whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember  
Dividends, interest and PIK included in income     $ 96  
Gross Additions     1,230  
Net Change in Unrealized Appreciation (Depreciation)     $ (1,230)  
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) Common Units One        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArcserveCaymanGpLlcMember   whfcl:ArcserveCaymanGpLlcMember  
Investment type whfcl:CommonUnitsMember   whfcl:CommonUnitsMember  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 700   $ 677  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Dividends, interest and PIK included in income $ 29   $ 116  
Beginning Fair Value 1,247      
Gross Additions 24   677  
Net Change in Unrealized Appreciation (Depreciation) (27)   570  
Ending Fair Value 1,244   1,247  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 583   $ 569  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember  
Investment type whfcl:UnsecuredLoanMember   whfcl:UnsecuredLoanMember  
Dividends, interest and PIK included in income $ 14   $ 54  
Beginning Fair Value 581      
Gross Additions 14   569  
Net Change in Unrealized Appreciation (Depreciation) (1)   12  
Ending Fair Value 594   581  
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan Two        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 597   $ 583  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember  
Investment type whfcl:UnsecuredLoanMember   whfcl:UnsecuredLoanMember  
Dividends, interest and PIK included in income $ 14   $ 55  
Beginning Fair Value 594      
Gross Additions 15   583  
Net Change in Unrealized Appreciation (Depreciation) (1)   11  
Ending Fair Value 608   594  
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units Two        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 19,568   $ 19,568  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArcserveCaymanTopcoLpMember   whfcl:ArcserveCaymanTopcoLpMember  
Investment type whfcl:CommonUnitsMember   whfcl:CommonUnitsMember  
Beginning Fair Value $ 9,131      
Gross Additions     $ 19,568  
Net Change in Unrealized Appreciation (Depreciation) (10)   (10,437)  
Ending Fair Value $ 9,121   $ 9,131  
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArteriocyteMedicalSystemsInc.Member   whfcl:ArteriocyteMedicalSystemsInc.Member  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 9      
Ending Fair Value 9   $ 9  
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,871   $ 4,877  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ArteriocyteMedicalSystemsInc.Member   whfcl:ArteriocyteMedicalSystemsInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,021      
Ending Fair Value 4,963   $ 5,021  
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 544   $ 545  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Avision Holdings, LLC (d/b/a Avision Sales Group)   Avision Holdings, LLC (d/b/a Avision Sales Group)  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 558      
Ending Fair Value 560   $ 558  
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 648   $ 648  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Avision Holdings, LLC (d/b/a Avision Sales Group)   Avision Holdings, LLC (d/b/a Avision Sales Group)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 652      
Ending Fair Value 652   $ 652  
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 287   $ 287  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Avision Holdings, LLC (d/b/a Avision Sales Group)   Avision Holdings, LLC (d/b/a Avision Sales Group)  
Investment type whfcl:ClassALLCInterestsMember   whfcl:ClassALLCInterestsMember  
Beginning Fair Value $ 577      
Ending Fair Value 547   $ 577  
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,655   $ 2,645  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 2,642      
Ending Fair Value 2,648   $ 2,642  
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 13,021   $ 12,972  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 12,955      
Ending Fair Value 12,988   $ 12,955  
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,100   $ 1,100  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember  
Investment type Common Stock   Common Stock  
Beginning Fair Value $ 907      
Ending Fair Value 970   $ 907  
Investment, Identifier [Axis]: BL Products Parent, LP (d/b/a Bishop Lifting Products, Inc.) Class A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 788  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:BLProductsParentLPMember  
Investment type     whfcl:ClassAUnitsMember  
Beginning Fair Value 1,012      
Ending Fair Value     $ 1,012  
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 788      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BLProductsParentLPMember      
Investment type whfcl:ClassAUnitsMember      
Ending Fair Value $ 1,012      
Investment, Identifier [Axis]: BPII-JL Group Holdings LP (d/b/a Juniper Landscaping Holdings LLC) Class A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 942  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:BPII-JLGroupHoldingsLPMember  
Investment type     whfcl:ClassAUnitsMember  
Beginning Fair Value 1,400      
Ending Fair Value     $ 1,400  
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 942      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BPII-JLGroupHoldingsLPMember      
Investment type whfcl:ClassAUnitsMember      
Ending Fair Value $ 1,434      
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 269   $ 447  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)   BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 461      
Ending Fair Value 281   $ 461  
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7,493   $ 7,580  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)   BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,691      
Ending Fair Value 7,596   $ 7,691  
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,874   $ 1,472  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 1,477      
Ending Fair Value $ 1,863   $ 1,477  
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 412  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 415      
Ending Fair Value (6)   $ 415  
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,958   $ 2,974  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 2,981      
Ending Fair Value $ 2,941   $ 2,981  
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ (2)      
Ending Fair Value (2)   $ (2)  
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 139   $ 58  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 63      
Ending Fair Value 143   $ 63  
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,538   $ 3,543  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,574      
Ending Fair Value $ 3,566   $ 3,574  
Investment, Identifier [Axis]: Basel U.S. Acquisition Co., Inc. First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BaselU.s.AcquisitionCo.Inc.Member   whfcl:BaselU.s.AcquisitionCo.Inc.Member  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 7      
Ending Fair Value 16   $ 7  
Investment, Identifier [Axis]: Basel U.S. Acquisition Co., Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,626   $ 3,633  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BaselU.s.AcquisitionCo.Inc.Member   whfcl:BaselU.s.AcquisitionCo.Inc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,675      
Ending Fair Value 3,694   $ 3,675  
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 237   $ 237  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BridgepointHealthcareLLCMember   whfcl:BridgepointHealthcareLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 231      
Ending Fair Value 238   $ 231  
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,327   $ 8,457  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BridgepointHealthcareLLCMember   whfcl:BridgepointHealthcareLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,429      
Ending Fair Value 8,335   $ 8,429  
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,117   $ 2,120  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 2,183      
Ending Fair Value 2,174   $ 2,183  
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 230   $ 230  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 248      
Ending Fair Value 247   $ 248  
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,764   $ 6,774  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 6,952      
Ending Fair Value 6,877   $ 6,952  
Investment, Identifier [Axis]: CX Holdco LLC Common Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,116   $ 1,116  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CXHoldcoLLCMember   whfcl:CXHoldcoLLCMember  
Investment type whfcl:CommonUnitsMember   whfcl:CommonUnitsMember  
Beginning Fair Value $ 2,232      
Ending Fair Value 1,883   $ 2,232  
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 811      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Camarillo Fitness Holdings, LLC [Member]      
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember      
Gross Additions $ 811      
Net Change in Unrealized Appreciation (Depreciation) (94)      
Ending Fair Value 717      
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 10,231   $ 10,269  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Camarillo Fitness Holdings, LLC [Member]   Camarillo Fitness Holdings, LLC [Member]  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Dividends, interest and PIK included in income $ (38)   $ 36  
Beginning Fair Value 10,492      
Gross Additions (38)   10,270  
Net Change in Unrealized Appreciation (Depreciation) 288   222  
Ending Fair Value 10,742   10,492  
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 10,325  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:CampFacilityServicesHoldingsLLCMember  
Investment type     whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value 9,905      
Ending Fair Value     $ 9,905  
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 10,301      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CampFacilityServicesHoldingsLLCMember      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 9,773      
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 840   $ 840  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CampFacilityServicesParentLLCMember   whfcl:CampFacilityServicesParentLLCMember  
Investment type whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember  
Beginning Fair Value $ 162      
Ending Fair Value $ 92   $ 162  
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CennoxHoldingsLimitedMember   whfcl:CennoxHoldingsLimitedMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 2      
Ending Fair Value 2   $ 2  
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 664   $ 665  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CennoxHoldingsLimitedMember   whfcl:CennoxHoldingsLimitedMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 643      
Ending Fair Value 664   $ 643  
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 96   $ 29  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CennoxInc.Member   whfcl:CennoxInc.Member  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 30      
Ending Fair Value 97   $ 30  
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 648   $ 649  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CennoxInc.Member   whfcl:CennoxInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 611      
Ending Fair Value 636   $ 611  
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,312   $ 3,319  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CennoxInc.Member   whfcl:CennoxInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,344      
Ending Fair Value 3,341   $ 3,344  
Investment, Identifier [Axis]: Chase Products Co. (f/k/a Starco) Second Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,442   $ 3,342  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ChaseProductsCoMember   whfcl:ChaseProductsCoMember  
Investment type whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember  
Dividends, interest and PIK included in income $ 100   $ 380  
Beginning Fair Value 3,342 2,793 2,793  
Gross Additions 100   380  
Net Change in Unrealized Appreciation (Depreciation)     169  
Ending Fair Value 3,442   3,342  
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 630   $ 630  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ClaridgeProductsandEquipmentLLCMember   whfcl:ClaridgeProductsandEquipmentLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 555      
Ending Fair Value 554   $ 555  
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,731   $ 5,690  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ClaridgeProductsandEquipmentLLCMember   whfcl:ClaridgeProductsandEquipmentLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,085      
Ending Fair Value 5,114   $ 5,085  
Investment, Identifier [Axis]: Clark Restaurant Service, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,911   $ 4,919  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ClarkRestaurantServiceLlcMember   whfcl:ClarkRestaurantServiceLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,993      
Ending Fair Value 4,981   $ 4,993  
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 15,823   $ 15,802  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CleanChoiceEnergyIncMember   whfcl:CleanChoiceEnergyIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 16,032      
Ending Fair Value $ 16,042   $ 16,032  
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CoastalTelevisionBroadcastingGroupLLCMember   whfcl:CoastalTelevisionBroadcastingGroupLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 1      
Ending Fair Value 1   $ 1  
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7,486   $ 7,808  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CoastalTelevisionBroadcastingGroupLLCMember   whfcl:CoastalTelevisionBroadcastingGroupLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,832      
Ending Fair Value 7,515   $ 7,832  
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 13,416   $ 13,445  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:DrewFoamCompaniesIncMember   whfcl:DrewFoamCompaniesIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 13,437      
Ending Fair Value 13,372   $ 13,437  
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,281   $ 8,299  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:E-PhoenixAcquisitionCo.Inc.Member   whfcl:E-PhoenixAcquisitionCo.Inc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,342      
Ending Fair Value $ 8,320   $ 8,342  
Investment, Identifier [Axis]: ELM One Call Locators, Inc. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ElmOneCallLocatorsInc.Member      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: ELM One Call Locators, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7,501      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ElmOneCallLocatorsInc.Member      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 7,501      
Investment, Identifier [Axis]: Eddy Acquisitions, LLC (d/b/a EducationDynamics, LLC) Preferred Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 167  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:EddyAcquisitionsLLCMember  
Investment type     whfcl:PreferredUnitsMember  
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 167      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:EddyAcquisitionsLLCMember      
Investment type whfcl:PreferredUnitsMember      
Investment, Identifier [Axis]: Education Dynamics, LLC Senior Preferred Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 167   $ 167  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember  
Investment type whfcl:SeniorPreferredUnitsMember   whfcl:SeniorPreferredUnitsMember  
Beginning Fair Value $ 100      
Ending Fair Value $ 127   $ 100  
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ (51)      
Ending Fair Value (46)   $ (51)  
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 12,912   $ 12,989  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 12,449      
Ending Fair Value 12,428   $ 12,449  
Investment, Identifier [Axis]: Event Services America, Inc. (d/b/a Contemporary Services Corporation) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,849   $ 6,857  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:EventServicesAmericaIncMember   whfcl:EventServicesAmericaIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,070      
Ending Fair Value 7,052   $ 7,070  
Investment, Identifier [Axis]: FGI Acquisition Corp. (d/b/a Flexitallic Group SAS) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 15,759      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:FgiAcquisitionCorpMember      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 15,985      
Investment, Identifier [Axis]: FGI Acquisition Corp. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 15,765  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:FgiAcquisitionCorpMember  
Investment type     whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 16,026      
Ending Fair Value     $ 16,026  
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:FloworksInternationalLlcMember   whfcl:FloworksInternationalLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,282   $ 5,280  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:FloworksInternationalLlcMember   whfcl:FloworksInternationalLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,281      
Ending Fair Value 5,279   $ 5,281  
Investment, Identifier [Axis]: Foodservices Brand Group, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 357   $ 357  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:FoodservicesBrandGroupLlcMember   whfcl:FoodservicesBrandGroupLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 321      
Ending Fair Value 321   $ 321  
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,995   $ 3,000  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 3,023      
Ending Fair Value $ 3,016   $ 3,023  
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 5      
Ending Fair Value 4   $ 5  
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,923   $ 8,937  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,007      
Ending Fair Value 8,984   $ 9,007  
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 20,081   $ 20,382  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:FuturePaymentTechnologiesLPMember   whfcl:FuturePaymentTechnologiesLPMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 20,420      
Ending Fair Value $ 20,109   $ 20,420  
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:G2LatherAcquisitionCorp.Member      
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:G2LatherAcquisitionCorp.Member      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,872      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:G2LatherAcquisitionCorp.Member      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 3,872      
Investment, Identifier [Axis]: Geo Logic Systems Ltd.First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:GeoLogicSystemsLtdMember   whfcl:GeoLogicSystemsLtdMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 2      
Ending Fair Value 1   $ 2  
Investment, Identifier [Axis]: Geo Logic Systems Ltd.First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 14,135   $ 14,234  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:GeoLogicSystemsLtdMember   whfcl:GeoLogicSystemsLtdMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 12,883      
Ending Fair Value 12,703   $ 12,883  
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 635   $ 444  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:GulfWindsInternationalAcquisitionLlcMember   whfcl:GulfWindsInternationalAcquisitionLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 447      
Ending Fair Value 631   $ 447  
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,800   $ 8,811  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:GulfWindsInternationalAcquisitionLlcMember   whfcl:GulfWindsInternationalAcquisitionLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,857      
Ending Fair Value $ 8,746   $ 8,857  
Investment, Identifier [Axis]: H I G Camarillo, LP, Limited Partners Interests        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:HIGCamarilloLpMember   whfcl:HIGCamarilloLpMember  
Investment type whfcl:LimitedPartnerInterestsMember   whfcl:LimitedPartnerInterestsMember  
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,383   $ 1,384  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 1,354      
Ending Fair Value 1,352   $ 1,354  
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 599   $ 480  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 455      
Ending Fair Value 573   $ 455  
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,517   $ 5,523  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,395      
Ending Fair Value $ 5,386   $ 5,395  
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ITSBuyerIncMember   whfcl:ITSBuyerIncMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 4      
Ending Fair Value 3   $ 4  
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,281   $ 3,286  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ITSBuyerIncMember   whfcl:ITSBuyerIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,307      
Ending Fair Value 3,300   $ 3,307  
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 10   $ 10  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)   whfcl:ImageOneIndustriesLLCMember  
Investment type whfcl:ClassAUnitsMember   whfcl:CommonAUnitsMember  
Beginning Fair Value $ 12      
Ending Fair Value $ 12   $ 12  
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Impact Advisors, LLC      
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Impact Advisors, LLC      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,158      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Impact Advisors, LLC      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 4,158      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Infotree Holdco LLC [Member]      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan One        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Infotree Holdco LLC [Member]      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,912      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Infotree Holdco LLC [Member]      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 2,912      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,496      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Infotree Holdco LLC [Member]      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 2,496      
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,322   $ 2,326  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 2,343      
Ending Fair Value 2,337   $ 2,343  
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 514   $ 513  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 522      
Ending Fair Value 521   $ 522  
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 10,981   $ 11,000  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 11,078      
Ending Fair Value $ 11,049   $ 11,078  
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:KoreWirelessGroupIncMember   whfcl:KoreWirelessGroupIncMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 9      
Ending Fair Value 8   $ 9  
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,246   $ 6,256  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:KoreWirelessGroupIncMember   whfcl:KoreWirelessGroupIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 6,323      
Ending Fair Value $ 6,306   $ 6,323  
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Kelso Industries LLC   Kelso Industries LLC  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Ending Fair Value $ (11)      
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,910   $ 3,539  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Kelso Industries LLC   Kelso Industries LLC  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,539      
Ending Fair Value 3,911   $ 3,539  
Investment, Identifier [Axis]: Keras Holdings, LLC Shares        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 496   $ 496  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:KerasHoldingsLLCMember   whfcl:KerasHoldingsLLCMember  
Investment type Common Stock   Common Stock  
Beginning Fair Value $ 779      
Ending Fair Value $ 782   $ 779  
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LINCSystemsLLCMember   whfcl:LINCSystemsLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 3      
Ending Fair Value 3   $ 3  
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,059   $ 8,114  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LINCSystemsLLCMember   whfcl:LINCSystemsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,155      
Ending Fair Value 8,091   $ 8,155  
Investment, Identifier [Axis]: LSCS Holdings, Inc. Second Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 4,953  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:LSCSHoldingsIncMember  
Investment type     whfcl:SecondLienSecuredTermLoanMember  
Beginning Fair Value 5,000      
Ending Fair Value     $ 5,000  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,006   $ 5,020  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 5,020      
Ending Fair Value 5,006   $ 5,020  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 437   $ 437  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 437      
Ending Fair Value 437   $ 437  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,368   $ 5,381  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,383      
Ending Fair Value 5,370   $ 5,383  
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 150      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LeviathanIntermediateHoldcoLlcMember   whfcl:LeviathanIntermediateHoldcoLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 10      
Ending Fair Value 149   $ 10  
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 13,530   $ 12,981  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LeviathanIntermediateHoldcoLlcMember   whfcl:LeviathanIntermediateHoldcoLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 13,312      
Ending Fair Value 13,523   $ 13,312  
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,443   $ 5,453  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LiftBrandsIncMember   whfcl:LiftBrandsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanAMember   whfcl:FirstLienSecuredTermLoanAMember  
Beginning Fair Value $ 5,461      
Ending Fair Value 5,447   $ 5,461  
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,631   $ 1,592  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LiftBrandsIncMember   whfcl:LiftBrandsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanBMember   whfcl:FirstLienSecuredTermLoanBMember  
Beginning Fair Value $ 1,594      
Ending Fair Value 1,632   $ 1,594  
Investment, Identifier [Axis]: LogicMonitor, Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 6,144  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     LogicMonitor, Inc.  
Investment type     whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value 6,144      
Ending Fair Value     $ 6,144  
Investment, Identifier [Axis]: LogicMonitor, Inc. - First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,147      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name LogicMonitor, Inc.      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 6,154      
Investment, Identifier [Axis]: LogicMonitor, Inc. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     LogicMonitor, Inc.  
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Identifier [Axis]: LogicMonitor, Inc.- First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name LogicMonitor, Inc.      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Ending Fair Value $ 1      
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,063   $ 4,556  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:LuxuryBrandHoldingsIncMember   whfcl:LuxuryBrandHoldingsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,580      
Ending Fair Value 4,080   $ 4,580  
Investment, Identifier [Axis]: M2S Group Intermediate Holdings, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,144   $ 9,119  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:M2sGroupIntermediateHoldingsIncMember   whfcl:M2sGroupIntermediateHoldingsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,453      
Ending Fair Value 9,450   $ 9,453  
Investment, Identifier [Axis]: MBS Highway, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,153   $ 9,157  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MbsHighwayLlcMember   whfcl:AlvariaHoldcoMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,212      
Ending Fair Value 9,227   $ 9,212  
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,305   $ 804  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 817      
Ending Fair Value 1,325   $ 817  
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 236   $ 236  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 249      
Ending Fair Value 248   $ 249  
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7,030   $ 7,040  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,176      
Ending Fair Value 7,162   $ 7,176  
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,044   $ 1,043  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MSIInformationServicesIncMember   whfcl:MSIInformationServicesIncMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 945      
Ending Fair Value 870   $ 945  
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,558   $ 8,552  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MSIInformationServicesIncMember   whfcl:MSIInformationServicesIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,871      
Ending Fair Value $ 7,539   $ 7,871  
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name M&M OpCo. LLC (d/b/a Escalent, Inc.)   M&M OpCo. LLC (d/b/a Escalent, Inc.)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 5      
Ending Fair Value 5   $ 5  
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,815   $ 4,823  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name M&M OpCo. LLC (d/b/a Escalent, Inc.)   M&M OpCo. LLC (d/b/a Escalent, Inc.)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,922      
Ending Fair Value $ 4,912   $ 4,922  
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MarlinDTC-LSMidco2LLCMember   whfcl:MarlinDTC-LSMidco2LLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ (38)      
Ending Fair Value (38)   $ (38)  
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 18,595   $ 18,577  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MarlinDTC-LSMidco2LLCMember   whfcl:MarlinDTC-LSMidco2LLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 17,865      
Ending Fair Value 17,869   $ 17,865  
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 400   $ 400  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember  
Investment type Common Stock   Common Stock  
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 410   $ 411  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 402      
Ending Fair Value $ 403   $ 402  
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ (3)      
Ending Fair Value (2)   $ (3)  
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,428   $ 6,439  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 6,324      
Ending Fair Value 6,344   $ 6,324  
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 936   $ 938  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 938      
Ending Fair Value 946   $ 938  
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,891   $ 4,898  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,986      
Ending Fair Value $ 5,039   $ 4,986  
Investment, Identifier [Axis]: Maxor Acquisition, Inc.First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 9      
Ending Fair Value 10   $ 9  
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:MedicalDeviceIncMember  
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value 6      
Ending Fair Value     $ 6  
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 2,584  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:MedicalDeviceIncMember  
Investment type     whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value 2,660      
Ending Fair Value     $ 2,660  
Investment, Identifier [Axis]: Merriman Holdings LP (d/b/a Escalent, Inc.) Class A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 333   $ 333  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MerrimanHoldingsLPMember   whfcl:MerrimanHoldingsLPMember  
Investment type whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember  
Beginning Fair Value $ 368      
Ending Fair Value 346   $ 368  
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 864   $ 865  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 874      
Ending Fair Value 871   $ 874  
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,146   $ 1,145  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 1,160      
Ending Fair Value 1,159   $ 1,160  
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 13,431   $ 13,449  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 12,465      
Ending Fair Value 12,965   $ 12,465  
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 951   $ 952  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 962      
Ending Fair Value 959   $ 962  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 632   $ 632  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)   Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 642      
Ending Fair Value 640   $ 642  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 224   $ 319  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)   Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 328      
Ending Fair Value 232   $ 328  
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,243   $ 9,255  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)   Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,399      
Ending Fair Value 9,370   $ 9,399  
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,570   $ 1,572  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MonarchCollectiveHoldingsLlcMember   whfcl:MonarchCollectiveHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 1,582      
Ending Fair Value 1,570   $ 1,582  
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,107   $ 9,119  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MonarchCollectiveHoldingsLlcMember   whfcl:MonarchCollectiveHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,223      
Ending Fair Value 9,156   $ 9,223  
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,250   $ 1,250  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MotivationalCIVLLCMember   whfcl:MotivationalCIVLLCMember  
Investment type whfcl:ClassBUnitsMember   whfcl:ClassBUnitsMember  
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,176   $ 1,175  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MotivationalMarketingLLCMember   whfcl:MotivationalMarketingLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 1,061      
Ending Fair Value 1,099   $ 1,061  
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 10,670   $ 10,449  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:MotivationalMarketingLLCMember   whfcl:MotivationalMarketingLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,438      
Ending Fair Value 9,972   $ 9,438  
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,263   $ 9,087  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:NNAServicesLLCMember   whfcl:NNAServicesLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,941      
Ending Fair Value 8,152   $ 8,941  
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 720   $ 719  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:NPAVLessorCorp.Member   whfcl:HRGManagementLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 660      
Ending Fair Value 660   $ 660  
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,407   $ 6,448  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:NPAVLessorCorp.Member   whfcl:HRGManagementLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,918      
Ending Fair Value 5,876   $ 5,918  
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 301   $ 301  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:NavigaIncMember   whfcl:NavigaIncMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 169      
Ending Fair Value 161   $ 169  
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,140   $ 3,140  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:NavigaIncMember   whfcl:NavigaIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 1,763      
Ending Fair Value $ 1,683   $ 1,763  
Investment, Identifier [Axis]: New American Crafts Holdings, LLC Class A Units        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:NewAmericanCraftsHoldingsLlcMember   whfcl:NewAmericanCraftsHoldingsLlcMember  
Investment type whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 90   $ 30  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name PANOS Brands, LLC   PANOS Brands, LLC  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 36      
Ending Fair Value 97   $ 36  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 81   $ 27  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name PANOS Brands, LLC   PANOS Brands, LLC  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 33      
Ending Fair Value 87   $ 33  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,434   $ 4,441  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name PANOS Brands, LLC   PANOS Brands, LLC  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,505      
Ending Fair Value 4,502   $ 4,505  
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,991   $ 3,997  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name PANOS Brands, LLC   PANOS Brands, LLC  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 4,054      
Ending Fair Value 4,051   $ 4,054  
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 24   $ 24  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PFBHoldcoIncMember   whfcl:PfbHoldingCompanyLlcMember  
Investment type whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember  
Investment, Identifier [Axis]: PLTFRM Companies, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 867  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:PltfrmCompaniesLlcMember  
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 916      
Ending Fair Value     $ 916  
Investment, Identifier [Axis]: PLTFRM Companies, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 7,757  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:PltfrmCompaniesLlcMember  
Investment type     whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value 8,188      
Ending Fair Value     $ 8,188  
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 12,661   $ 12,602  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PatagoniaHoldcoLLCMember   whfcl:PatagoniaHoldcoLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 13,135      
Ending Fair Value 13,104   $ 13,135  
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 21      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Pavement Partners Interco, LLC      
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember      
Ending Fair Value $ 22      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 558   $ 558  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Pavement Partners Interco, LLC   Pavement Partners Interco, LLC  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 569      
Ending Fair Value 568   $ 569  
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Pavement Partners Interco, LLC      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Ending Fair Value $ 7      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 241   $ 331  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Pavement Partners Interco, LLC   Pavement Partners Interco, LLC  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 341      
Ending Fair Value 250   $ 341  
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 161      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Pavement Partners Interco, LLC      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 162      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,009   $ 5,015  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Pavement Partners Interco, LLC   Pavement Partners Interco, LLC  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,111      
Ending Fair Value $ 5,101   $ 5,111  
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PirtekHoldcoLLCMember   whfcl:PirtekHoldcoLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 17      
Ending Fair Value 16   $ 17  
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,796   $ 7,298  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PirtekHoldcoLLCMember   whfcl:PirtekHoldcoLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,425      
Ending Fair Value $ 6,973   $ 7,425  
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 460  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PlaymonsterGroupEquityIncMember   whfcl:PlaymonsterGroupEquityIncMember  
Investment type Common Stock   Common Stock  
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PlaymonsterGroupEquityIncMember      
Investment type us-gaap:PreferredStockMember      
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 460      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PlaymonsterGroupEquityIncMember      
Investment type Common Stock      
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,600   $ 3,600  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PlaymonsterGroupEquityIncMember   whfcl:PlaymonsterGroupEquityIncMember  
Investment type us-gaap:PreferredStockMember   us-gaap:PreferredStockMember  
Investment, Identifier [Axis]: Playmonster Group LLC, First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,661   $ 3,661  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PlaymonsterGroupLLCMember   whfcl:PlaymonsterGroupLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 1,635 1,363 $ 1,363  
Net Change in Unrealized Appreciation (Depreciation) (34)   272  
Ending Fair Value 1,601   1,635  
Investment, Identifier [Axis]: Playmonster Group LLC, Priority First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,315   $ 1,275  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PlaymonsterGroupLLCMember   whfcl:PlaymonsterGroupLLCMember  
Investment type whfcl:PriorityFirstLienSecuredTermLoanMember   whfcl:PriorityFirstLienSecuredTermLoanMember  
Dividends, interest and PIK included in income $ 39   $ 157  
Beginning Fair Value 1,172 1,015 1,015  
Gross Additions 39   157  
Net Change in Unrealized Appreciation (Depreciation) (5)      
Ending Fair Value 1,206   1,172  
Investment, Identifier [Axis]: Power Service Group CR Acquisition Inc First Lien Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,274   $ 1,329  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PowerServiceGroupCrAcquisitionIncMember   whfcl:PowerServiceGroupCrAcquisitionIncMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 1,354      
Ending Fair Value 1,296   $ 1,354  
Investment, Identifier [Axis]: Power Service Group CR Acquisition Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,281   $ 8,642  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PowerServiceGroupCrAcquisitionIncMember   whfcl:PowerServiceGroupCrAcquisitionIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,784      
Ending Fair Value $ 8,408   $ 8,784  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Common Units        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PressurizedHoldingsLlcMember   whfcl:PressurizedHoldingsLlcMember  
Investment type whfcl:CommonUnitsMember   whfcl:CommonUnitsMember  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Preferred Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,537   $ 4,537  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PressurizedHoldingsLlcMember   whfcl:PressurizedHoldingsLlcMember  
Investment type whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember  
Beginning Fair Value $ 1,657 251 $ 251  
Net Change in Unrealized Appreciation (Depreciation) 565   1,406  
Ending Fair Value 2,222   $ 1,657  
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:PrincipalLightingGroupLlcMember  
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,472   $ 3,479  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:PrincipalLightingGroupLlcMember   whfcl:PrincipalLightingGroupLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 3,479      
Ending Fair Value 3,472   $ 3,479  
Investment, Identifier [Axis]: Quest Events, LLC Common Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 376   $ 376  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Quest Events, LLC [Member]   Quest Events, LLC [Member]  
Investment type whfcl:CommonUnitsMember   whfcl:CommonAUnitsMember  
Beginning Fair Value $ 149      
Ending Fair Value 154   $ 149  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 173      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Quest Events, LLC [Member]      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Ending Fair Value $ 175      
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 411   $ 246  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Quest Events, LLC [Member]   Quest Events, LLC [Member]  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 248      
Ending Fair Value 406   $ 248  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,244   $ 472  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Quest Events, LLC [Member]   Quest Events, LLC [Member]  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 473      
Ending Fair Value 1,244   $ 473  
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 11,537   $ 11,563  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Quest Events, LLC [Member]   Quest Events, LLC [Member]  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 11,592      
Ending Fair Value 11,415   $ 11,592  
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,916   $ 2,922  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 2,946      
Ending Fair Value $ 2,938   $ 2,946  
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 11      
Ending Fair Value 10   $ 11  
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 10,816   $ 10,839  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 10,923      
Ending Fair Value 10,894   $ 10,923  
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,561   $ 6,566  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:RLJPro-VacInc.Member   whfcl:RLJPro-VacInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 6,637      
Ending Fair Value $ 6,613   $ 6,637  
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)   Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 9      
Ending Fair Value 14   $ 9  
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,586   $ 8,600  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)   Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,692      
Ending Fair Value 8,724   $ 8,692  
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 514   $ 514  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:Ross-SimonsTopcoLPMember   whfcl:Ross-SimonsTopcoLPMember  
Investment type whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember  
Beginning Fair Value $ 756      
Ending Fair Value $ 776   $ 756  
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ScicBuyerInc.Member      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 291      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ScicBuyerInc.Member      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Ending Fair Value $ 291      
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,022      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ScicBuyerInc.Member      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 9,022      
Investment, Identifier [Axis]: Salon Republic Holdings, LLC Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 400  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:SalonRepublicInvestmentsLlcMember  
Investment type     Common Stock  
Beginning Fair Value 132      
Ending Fair Value     $ 132  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,641   $ 1,641  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 1,672      
Ending Fair Value $ 1,666   $ 1,672  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 13      
Ending Fair Value 11   $ 13  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,984   $ 4,988  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,063      
Ending Fair Value 5,050   $ 5,063  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC, Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment     $ 200  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name     whfcl:SalonRepublicInvestmentsLlcMember  
Investment type     us-gaap:PreferredStockMember  
Beginning Fair Value 242      
Ending Fair Value     $ 242  
Investment, Identifier [Axis]: Salon Republic Investments LLC Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 400      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SalonRepublicInvestmentsLlcMember      
Investment type Common Stock      
Ending Fair Value $ 62      
Investment, Identifier [Axis]: Salon Republic Investments LLC Preferred Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 200      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SalonRepublicInvestmentsLlcMember      
Investment type us-gaap:PreferredStockMember      
Ending Fair Value $ 247      
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SleepOpCoLLCMember   whfcl:SleepOpCoLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 5      
Ending Fair Value 2   $ 5  
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 22,283   $ 22,401  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SleepOpCoLLCMember   whfcl:SleepOpCoLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 22,441      
Ending Fair Value 22,309   $ 22,441  
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 968   $ 967  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SmaltoInc.Member   whfcl:SmaltoInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 978      
Ending Fair Value 978   $ 978  
Investment, Identifier [Axis]: Smalto Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,691   $ 6,682  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SmaltoInc.Member   whfcl:SmaltoInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 6,654      
Ending Fair Value 6,947   $ 6,654  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,941   $ 1,941  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember  
Investment type us-gaap:CommonClassAMember   us-gaap:CommonClassAMember  
Beginning Fair Value $ 173      
Ending Fair Value 282   $ 173  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,862   $ 1,819  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanCMember   whfcl:FirstLienSecuredTermLoanCMember  
Beginning Fair Value $ 1,790      
Ending Fair Value 1,831   $ 1,790  
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 793   $ 793  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember  
Investment type Warrant   Warrant  
Beginning Fair Value $ 70      
Ending Fair Value 114   $ 70  
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 3,832   $ 3,839  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SourceCodeHoldingsLLCMember   whfcl:SourceCodeHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 3,854      
Ending Fair Value 3,862   $ 3,854  
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 14,015   $ 14,041  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SourceCodeHoldingsLLCMember   whfcl:SourceCodeHoldingsLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 14,095      
Ending Fair Value 14,124   $ 14,095  
Investment, Identifier [Axis]: Sterling Pure Blocker, LLC (d/b/a Banner Industries, Inc.) Class B Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 404   $ 404  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:SterlingPureBlockerLlcMember   whfcl:SterlingPureBlockerLlcMember  
Investment type whfcl:ClassBUnitsMember   whfcl:ClassBUnitsMember  
Beginning Fair Value $ 388      
Ending Fair Value 285   $ 388  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 572   $ 573  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)   Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 577      
Ending Fair Value 583   $ 577  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 719   $ 574  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)   Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 576      
Ending Fair Value 724   $ 576  
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,621   $ 5,629  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)   Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,643      
Ending Fair Value 5,665   $ 5,643  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Delayed Draw Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,084      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name TOT Group, Inc. (d/b/a Netevia Group LLC)   TOT Group, Inc. (d/b/a Netevia Group LLC)  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ (1)      
Ending Fair Value $ 1,084   $ (1)  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name TOT Group, Inc. (d/b/a Netevia Group LLC)   TOT Group, Inc. (d/b/a Netevia Group LLC)  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,002   $ 8,074  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name TOT Group, Inc. (d/b/a Netevia Group LLC)   TOT Group, Inc. (d/b/a Netevia Group LLC)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,067      
Ending Fair Value 9,006   $ 8,067  
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,464   $ 2,468  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TabletrustBrandsLlcMember   whfcl:TabletrustBrandsLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 2,468      
Ending Fair Value 2,469   $ 2,468  
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 1,051   $ 1,051  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Telestream Holdings Corporation   Telestream Holdings Corporation  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 1,009      
Ending Fair Value 1,027   $ 1,009  
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 17,496   $ 17,496  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Telestream Holdings Corporation   Telestream Holdings Corporation  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 17,063      
Ending Fair Value $ 17,416   $ 17,063  
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CromCorporationMember      
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 142      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CromCorporationMember      
Investment type whfcl:FirstLienSecuredRevolvingLoanMember      
Ending Fair Value $ 142      
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,020      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:CromCorporationMember      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 4,020      
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 374   $ 795  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TheKyjenCompanyLLCMember   whfcl:TheKyjenCompanyLLCMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 761      
Ending Fair Value 321   $ 761  
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 11,311   $ 11,309  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TheKyjenCompanyLLCMember   whfcl:TheKyjenCompanyLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 10,895      
Ending Fair Value 10,668   $ 10,895  
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 4,841   $ 6,709  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TokenBuyerIncMember   whfcl:TokenBuyerIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,658      
Ending Fair Value $ 3,773   $ 5,658  
Investment, Identifier [Axis]: Trailhead Media LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Trailhead Media LLC   Trailhead Media LLC  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Ending Fair Value $ 4      
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Trailhead Media LLC   Trailhead Media LLC  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Ending Fair Value $ 1      
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,549   $ 6,548  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name Trailhead Media LLC   Trailhead Media LLC  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 6,548      
Ending Fair Value 6,558   $ 6,548  
Investment, Identifier [Axis]: Transervice Holdings, Inc. (d/b/a Transervice Logistics, Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 8,439   $ 8,481  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TranserviceHoldingsIncMember   whfcl:TranserviceHoldingsIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 8,715      
Ending Fair Value 8,628   $ 8,715  
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 15,016   $ 15,006  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TrimliteBuyerLLCMember   whfcl:TrimliteBuyerLLCMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 13,206      
Ending Fair Value $ 13,170   $ 13,206  
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 9      
Ending Fair Value $ 19   $ 9  
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 12      
Ending Fair Value 12   $ 12  
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,247   $ 5,254  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,338      
Ending Fair Value $ 5,365   $ 5,338  
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TurnberrySolutionsInc.Member   whfcl:TurnberrySolutionsInc.Member  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 4      
Ending Fair Value 4   $ 4  
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 5,915   $ 5,924  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TurnberrySolutionsInc.Member   whfcl:TurnberrySolutionsInc.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 5,964      
Ending Fair Value 5,949   $ 5,964  
Investment, Identifier [Axis]: Twin Ridge CRS, LP (d/b/a CRS OneSource) Class A Common Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 317   $ 317  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:TwinRidgeCrsLpMember   whfcl:TwinRidgeCrsLpMember  
Investment type whfcl:ClassCommonUnitsMember   us-gaap:CommonClassAMember  
Beginning Fair Value $ 350      
Ending Fair Value 331   $ 350  
Investment, Identifier [Axis]: UserZoom Technologies, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 9,629   $ 9,618  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:UserzoomTechnologiesIncMember   whfcl:NavigaIncMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 9,809      
Ending Fair Value 9,781   $ 9,809  
Investment, Identifier [Axis]: Vistria Blocked MGT Investor, LP (d/b/a MGT Consulting Group) Series A Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 314   $ 314  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:VistriaBlockedMgtInvestorLpMember   whfcl:VistriaBlockedMgtInvestorLpMember  
Investment type whfcl:ClassAUnitsMember   whfcl:SeriesUnitsMember  
Beginning Fair Value $ 493      
Ending Fair Value $ 516   $ 493  
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)   W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 9      
Ending Fair Value 15   $ 9  
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 12,135   $ 12,124  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)   W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 12,216      
Ending Fair Value 12,289   $ 12,216  
Investment, Identifier [Axis]: WCHG Buyer, Inc. First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 6,966      
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WchgBuyerInc.Member      
Investment type whfcl:FirstLienSecuredTermLoanMember      
Ending Fair Value $ 6,966      
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WHFSTRSOhioSeniorLoanFundLLCMember   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember  
Investment type Equity (excluding STRS JV)   Equity (excluding STRS JV)  
Dividends, interest and PIK included in income $ 1,382   $ 6,861  
Beginning Fair Value 22,741 22,782 22,782  
Net Change in Unrealized Appreciation (Depreciation) (442)   (41)  
Ending Fair Value 22,299   22,741  
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 21,104   $ 21,104  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WHFSTRSOhioSeniorLoanFundMember   whfcl:WHFSTRSOhioSeniorLoanFundMember  
Investment type whfcl:LLCInterestsMember   whfcl:LLCInterestsMember  
Beginning Fair Value $ 22,741      
Ending Fair Value 22,299   $ 22,741  
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 84,416   $ 84,416  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WHFSTRSOhioSeniorLoanFundLLCMember   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember  
Investment type Subordinated Notes   Subordinated Notes  
Dividends, interest and PIK included in income $ 2,284   $ 9,838  
Beginning Fair Value 84,416 84,416 84,416  
Ending Fair Value $ 84,416   $ 84,416  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Delayed Draw Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember  
Investment type whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Beginning Fair Value $ 2      
Ending Fair Value (11)   $ 2  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Revolving Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 253   $ 253  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 254      
Ending Fair Value 253   $ 254  
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 7,536   $ 7,548  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 7,555      
Ending Fair Value 7,538   $ 7,555  
Investment, Identifier [Axis]: What If Media Group, LLC Common Units        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 851   $ 851  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WhatIfMediaGroupLLCMember   whfcl:WhatIfMediaGroupLLCMember  
Investment type whfcl:CommonUnitsMember   whfcl:CommonUnitsMember  
Beginning Fair Value $ 1,756      
Ending Fair Value 1,762   $ 1,756  
Investment, Identifier [Axis]: Whitestone Home Furnishings, LLC (d/b/a Saatva, Inc.) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 2,879   $ 2,887  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:WhitestoneHomeFurnishingsLlcMember   whfcl:WhitestoneHomeFurnishingsLlcMember  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 2,930      
Ending Fair Value $ 2,926   $ 2,930  
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Revolving Loan        
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ZephyrBuyerL.p.Member   whfcl:ZephyrBuyerL.p.Member  
Investment type whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Beginning Fair Value $ 48      
Ending Fair Value 36   $ 48  
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Term Loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment $ 13,769   $ 13,789  
Schedule of investments in and advances to affiliated and controlled persons        
Issuer name whfcl:ZephyrBuyerL.p.Member   whfcl:ZephyrBuyerL.p.Member  
Investment type whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember  
Beginning Fair Value $ 14,166      
Ending Fair Value 14,192   $ 14,166  
Honors Holdings, LLC | First lien secured term loan, delayed draw loan and revolver loan        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment       $ 17,816
Honors Holdings, LLC | First lien secured investments        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment       7,582
Camarillo Fitness Holdings, LLC And H.I.G. Camarillo, L.P. | First lien secured term loan and common equity interests        
Investments in and Advances to Affiliates [Line Items]        
Cost of investment       $ 10,234
Non-controlled affiliate company investments        
Schedule of investments in and advances to affiliated and controlled persons        
Dividends, interest and PIK included in income 158   798  
Beginning Fair Value 29,851 5,422 5,422  
Gross Additions 965   32,204  
Net Change in Unrealized Appreciation (Depreciation) 681 (10,010) (7,775)  
Ending Fair Value 31,497   29,851  
Controlled affiliate company investments        
Schedule of investments in and advances to affiliated and controlled persons        
Dividends, interest and PIK included in income 3,666   17,079  
Beginning Fair Value 107,530 112,948 112,948  
Gross Additions     3,795  
Net Change in Unrealized Appreciation (Depreciation) (815) $ (269) (9,213)  
Ending Fair Value $ 106,715   $ 107,530  
v3.25.1
INVESTMENTS - WHF STRS Ohio Senior Loan Fund LLC (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 26, 2024
May 08, 2024
May 18, 2023
Jan. 13, 2023
USD ($)
Mar. 11, 2022
USD ($)
Jul. 15, 2021
Jul. 31, 2019
Mar. 31, 2025
USD ($)
company
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
company
Feb. 28, 2023
USD ($)
Mar. 10, 2022
USD ($)
Feb. 28, 2022
USD ($)
Jan. 27, 2021
USD ($)
Jul. 19, 2019
USD ($)
Jan. 14, 2019
USD ($)
Schedule of Investments [Line Items]                                
Investments, fair value               $ 650,999   $ 642,213            
Cost of investment               706,224   695,240            
Increase in credit facility limit               (34) $ (8)              
Available               164,864   173,507            
Amortized Cost, credit facility               $ 361,133                
Minimum                                
Schedule of Investments [Line Items]                                
Term of interest               3 years                
Maximum                                
Schedule of Investments [Line Items]                                
Term of interest               6 years                
SOFR | Minimum                                
Schedule of Investments [Line Items]                                
Term of interest             3 years                  
SOFR | Maximum                                
Schedule of Investments [Line Items]                                
Term of interest             6 years                  
LIBOR | Minimum                                
Schedule of Investments [Line Items]                                
Term of interest               3 years                
LIBOR | Maximum                                
Schedule of Investments [Line Items]                                
Term of interest               6 years                
State Teachers Retirement System Joint Venture Credit Facility, EUR, GBP and USD Denominated Borrowings | Base Rate                                
Schedule of Investments [Line Items]                                
Variable interest rate (as a percent)   2.50%                            
State Teachers Retirement System Joint Venture Credit Facility, CAD Denominated Borrowings | Base Rate                                
Schedule of Investments [Line Items]                                
Variable interest rate (as a percent)   2.82%                            
Subordinated Notes                                
Schedule of Investments [Line Items]                                
Investments, fair value               $ 1,202   1,175            
Cost of investment               1,180   1,152            
Equity (excluding STRS JV)                                
Schedule of Investments [Line Items]                                
Investments, fair value               45,376   45,587            
Cost of investment               $ 63,299   $ 63,299            
STRS JV                                
Schedule of Investments [Line Items]                                
Combined investment commitment in joint venture                               $ 125,000
Investment commitment in joint venture                     $ 115,000   $ 100,000     75,000
Increase in investment commitment in joint venture                     $ 15,000   $ 25,000      
Economic ownership (as a percent)               65.71%   34.29% 0.6571%   0.6667%      
Investments, fair value               $ 323,516   $ 309,077            
Portfolio companies | company               41   38            
Largest single investment               $ 19,594   $ 19,594            
Five largest investments               79,522   79,058            
STRS JV | STRS JV Credit Facility                                
Schedule of Investments [Line Items]                                
Maximum borrowing limit       $ 262,500 $ 225,000     $ 262,500   262,500       $ 175,000 $ 125,000  
Increase in credit facility limit       37,500                        
Variable interest rate (as a percent)           2.35%   2.25%                
Available         168,750             $ 131,250        
Borrowings greater than         $ 175,000                      
Amortized Cost, credit facility               $ 159,060   $ 144,081            
Effective interest rate (as a percent)               6.22%   0.0642%            
STRS JV | STRS JV Credit Facility | Minimum                                
Schedule of Investments [Line Items]                                
Variable interest rate (as a percent) 0.025%                              
STRS JV | STRS JV Credit Facility | Maximum                                
Schedule of Investments [Line Items]                                
Variable interest rate (as a percent) 0.0225%                              
STRS JV | STRS JV Credit Facility | SOFR                                
Schedule of Investments [Line Items]                                
Maximum borrowing limit       $ 175,000                        
Variable interest rate (as a percent)     2.72%   2.50%         0.0225%            
Effective interest rate (as a percent)       2.71%                        
STRS JV | STRS JV Credit Facility | SOFR | Borrowings under $37.5 million                                
Schedule of Investments [Line Items]                                
Variable interest rate (as a percent)       3.00%                        
STRS JV | Subordinated Notes                                
Schedule of Investments [Line Items]                                
Investment commitment in joint venture                     $ 92,000   $ 80,000      
Cost of investment               $ 84,416   $ 84,416            
Commitments to fund subordinated notes               92,000   92,000            
Unfunded subordinated notes               7,584   7,584            
STRS JV | Equity (excluding STRS JV)                                
Schedule of Investments [Line Items]                                
Investment commitment in joint venture                     23,000   $ 20,000      
Cost of investment               21,104   21,104            
Commitments to fund equity interests               23,000   23,000            
Unfunded equity interests               $ 1,896   $ 1,896            
STRS JV | STRS Ohio                                
Schedule of Investments [Line Items]                                
Investment commitment in joint venture                     60,000         $ 50,000
Increase in investment commitment in joint venture                     $ 10,000          
Economic ownership (as a percent)                     0.3429%   0.3333%      
STRS JV | STRS Ohio | Subordinated Notes                                
Schedule of Investments [Line Items]                                
Investment commitment in joint venture                     $ 48,000          
STRS JV | STRS Ohio | Equity (excluding STRS JV)                                
Schedule of Investments [Line Items]                                
Investment commitment in joint venture                     $ 12,000          
v3.25.1
INVESTMENTS - STRS JVs individual Investments (Details)
$ in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
shares
Dec. 31, 2024
USD ($)
shares
Mar. 31, 2025
CAD ($)
shares
Dec. 31, 2024
CAD ($)
shares
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Schedule of Investments [Line Items]                
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment Owned, at Cost $ 706,224 $ 706,224 $ 706,224 $ 695,240        
Investment Owned, at Fair Value $ 650,999 $ 650,999 $ 650,999 $ 642,213        
Percent of net assets 231.30% 231.30% 231.30% 224.40% 231.30% 224.40%    
Total investments and money market funds amortized cost $ 720,546 $ 720,546 $ 720,546 $ 708,489        
Total investments and money market funds fair value $ 665,321 $ 665,321 $ 665,321 $ 655,462        
Total investments and money market funds percentage 236.40% 236.40% 236.40% 229.00% 236.40% 229.00%    
STRS JV                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 311,375 $ 311,375 $ 311,375 $ 296,752        
Investments owned non-accrual status             $ 0  
Investment Owned, at Fair Value $ 310,160 $ 310,160 $ 310,160 $ 294,957        
Fair Value As A Percentage of Member's Equity   914.00%   852.30%        
Percent of net assets 914.00% 914.00% 914.00% 852.30% 914.00% 852.30%    
Total investments and money market funds amortized cost $ 312,400 $ 312,400 $ 312,400 $ 297,519        
Total investments and money market funds fair value $ 311,185 $ 311,185 $ 311,185 $ 295,724        
Total investments and money market funds percentage 917.00% 917.00% 917.00% 854.50% 917.00% 854.50%    
Canadian Overnight Repo Rate Average                
Schedule of Investments [Line Items]                
Investment Interest Rate 2.80% 2.80% 2.80%   2.80%      
Prime Rate [Member]                
Schedule of Investments [Line Items]                
Investment Interest Rate 7.50% 7.50% 7.50%   7.50%      
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                
Schedule of Investments [Line Items]                
Rate of interest on investment per duration period 4.30% 4.30% 4.20%          
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%    
Investment Interest Rate 9.32% 9.32% 9.32% 9.78% 9.32% 9.78%    
Investment, Acquisition Date   Sep. 19, 2024   Sep. 19, 2024        
Investment Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031    
Investment Owned, Balance, Principal Amount $ 348 $ 348 $ 348 $ 78        
Investment Owned, at Cost 345 345 345 78        
Investment Owned, at Fair Value $ 358 $ 358 $ 358 $ 80        
Fair Value As A Percentage of Member's Equity   1.10%   0.20%        
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%    
Investment Interest Rate 9.32% 9.32% 9.32% 9.78% 9.32% 9.78%    
Investment, Acquisition Date   Sep. 19, 2024   Sep. 19, 2024        
Investment Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031    
Investment Owned, at Fair Value $ 8 $ 8 $ 8 $ 5        
Investment, Identifier [Axis]: AB Centers Acquisition Corporation First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AbCentersAcquisitionCorporationMember   whfcl:AbCentersAcquisitionCorporationMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%    
Investment Interest Rate 9.32% 9.32% 9.32% 9.79% 9.32% 9.79%    
Investment, Acquisition Date   Sep. 19, 2024   Sep. 19, 2024        
Investment Maturity Date Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031 Jul. 02, 2031    
Investment Owned, Balance, Principal Amount $ 7,946 $ 7,946 $ 7,946 $ 7,962        
Investment Owned, at Cost 7,854 7,854 7,854 7,866        
Investment Owned, at Fair Value $ 7,964 $ 7,964 $ 7,964 $ 7,919        
Fair Value As A Percentage of Member's Equity   23.50%   22.90%        
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ABBCon-ciseOpticalGroupLLCMember   whfcl:ABBCon-ciseOpticalGroupLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment Interest Rate 11.95% 11.95% 11.95% 11.98% 11.95% 11.98%    
Investment, Acquisition Date   Feb. 23, 2022   Feb. 23, 2022        
Investment Maturity Date Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028    
Investment Owned, Balance, Principal Amount $ 20,409 $ 20,409 $ 20,409 $ 20,409        
Investment Owned, at Cost 20,163 20,163 20,163 20,142        
Investment Owned, at Fair Value $ 19,163 $ 19,163 $ 19,163 $ 19,535        
Percent of net assets 6.80% 6.80% 6.80% 6.80% 6.80% 6.80%    
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.06% 10.06% 10.06% 10.40% 10.06% 10.40%    
Investment, Acquisition Date   Apr. 26, 2024   Apr. 26, 2024        
Investment Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030    
Investment Owned, at Fair Value $ 14 $ 14 $ 14 $ 15        
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.06% 10.06% 10.06% 10.40% 10.06% 10.40%    
Investment, Acquisition Date   Apr. 26, 2024   Apr. 26, 2024        
Investment Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030    
Investment Owned, at Fair Value $ 5 $ 5 $ 5 $ 6        
Investment, Identifier [Axis]: APG Lions Purchaser, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ApgLionsPurchaserLlcMember   whfcl:ApgLionsPurchaserLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.06% 10.06% 10.06% 10.40% 10.06% 10.40%    
Investment, Acquisition Date   Apr. 26, 2024   Apr. 26, 2024        
Investment Maturity Date Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030 Apr. 16, 2030    
Investment Owned, Balance, Principal Amount $ 4,080 $ 4,080 $ 4,080 $ 4,080        
Investment Owned, at Cost 4,028 4,028 4,028 4,027        
Investment Owned, at Fair Value $ 4,070 $ 4,070 $ 4,070 $ 4,070        
Fair Value As A Percentage of Member's Equity   12.00%   11.80%        
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment Interest Rate 11.94% 11.94% 11.94% 11.96% 11.94% 11.96%    
Investment, Acquisition Date   Mar. 20, 2024   Mar. 20, 2024        
Investment Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028    
Investment Owned, Balance, Principal Amount $ 1,810 $ 1,810 $ 1,810 $ 1,782        
Investment Owned, at Cost 1,656 1,656 1,656 1,615        
Investment Owned, at Fair Value $ 1,479 $ 1,479 $ 1,479 $ 1,456        
Investment, Interest Rate, Paid in Kind 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment, Interest Rate, Paid in Cash 5.44% 5.44% 5.44% 5.46% 5.44% 5.46%    
Percent of net assets 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%    
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Four                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%    
Investment Interest Rate 11.44% 11.44% 11.44% 11.46% 11.44% 11.46%    
Investment, Acquisition Date   Mar. 20, 2024   Mar. 20, 2024        
Investment Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028    
Investment Owned, Balance, Principal Amount $ 2,400 $ 2,400 $ 2,400 $ 2,400        
Investment Owned, at Cost 2,262 2,262 2,262 2,330        
Investment Owned, at Fair Value $ 53 $ 53 $ 53 $ 74        
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Three                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%    
Investment Interest Rate 11.44% 11.44% 11.44% 11.46% 11.44% 11.46%    
Investment, Acquisition Date   Mar. 20, 2024   Mar. 20, 2024        
Investment Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028    
Investment Owned, Balance, Principal Amount $ 9,600 $ 9,600 $ 9,600 $ 9,600        
Investment Owned, at Cost 9,050 9,050 9,050 9,318        
Investment Owned, at Fair Value $ 3,637 $ 3,637 $ 3,637 $ 3,990        
Percent of net assets 1.30% 1.30% 1.30% 1.40% 1.30% 1.40%    
Investment, Identifier [Axis]: Alvaria Holdco (Cayman) (d/b/a Aspect Software, Inc.) First Lien Secured Term Loan Two                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AlvariaHoldcoMember   whfcl:AlvariaHoldcoMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment Interest Rate 11.94% 11.94% 11.94% 11.96% 11.94% 11.96%    
Investment, Acquisition Date   Mar. 20, 2024   Mar. 20, 2024        
Investment Maturity Date May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028 May 08, 2028    
Investment Owned, Balance, Principal Amount $ 1,194 $ 1,194 $ 1,194 $ 1,178        
Investment Owned, at Cost 1,011 1,011 1,011 1,029        
Investment Owned, at Fair Value $ 418 $ 418 $ 418 $ 451        
Investment, Interest Rate, Paid in Kind 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment, Interest Rate, Paid in Cash 6.44% 6.44% 6.44% 6.46% 6.44% 6.46%    
Percent of net assets 0.10% 0.10% 0.10% 0.20% 0.10% 0.20%    
Investment, Identifier [Axis]: American Crafts Holdings, LLC, Warrants                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsHoldingsLlcMember   whfcl:AmericanCraftsHoldingsLlcMember        
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Acquisition Date   Dec. 22, 2022   Dec. 22, 2022        
Investment Maturity Date Dec. 22, 2032 Dec. 22, 2032 Dec. 22, 2032   Dec. 22, 2032      
Investment, Identifier [Axis]: American Crafts Lc Super Priority First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember        
Investment, Type [Extensible Enumeration] whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment, Acquisition Date   Jul. 25, 2023   Jul. 25, 2023        
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026    
Investment Owned, Balance, Principal Amount $ 2,263 $ 2,263 $ 2,263 $ 2,191        
Investment Owned, at Cost $ 2,094 $ 2,094 $ 2,094 $ 2,094        
Investment Owned, at Fair Value               $ 1,878
Investment, Interest Rate, Paid in Kind 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment, Acquisition Date   Jan. 25, 2022   Jan. 25, 2022        
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026    
Investment Owned, Balance, Principal Amount $ 1,883 $ 1,883 $ 1,883 $ 1,823        
Investment Owned, at Cost $ 1,458 $ 1,458 $ 1,458 $ 1,458        
Investment Owned, at Fair Value               93
Investment, Interest Rate, Paid in Kind 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment, Acquisition Date   May 28, 2021   May 28, 2021        
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026    
Investment Owned, Balance, Principal Amount $ 11,213 $ 11,213 $ 11,213 $ 10,859        
Investment Owned, at Cost $ 8,720 $ 8,720 $ 8,720 $ 8,720        
Investment Owned, at Fair Value               553
Investment, Interest Rate, Paid in Kind 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Investment, Identifier [Axis]: American Crafts, LC Priority First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember        
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment Interest Rate       12.96%   12.96%    
Investment, Acquisition Date   Dec. 22, 2022   Dec. 22, 2022        
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026    
Investment Owned, Balance, Principal Amount $ 6,068 $ 6,068 $ 6,068 $ 5,876        
Investment Owned, at Cost $ 5,105 $ 5,105 $ 5,105 $ 5,105        
Investment Owned, at Fair Value               3,226
Investment, Interest Rate, Paid in Kind 12.92% 12.92% 12.92%   12.92%      
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember        
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment, Acquisition Date   May 02, 2024   May 02, 2024        
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026    
Investment Owned, Balance, Principal Amount $ 2,566 $ 2,566 $ 2,566 $ 2,485        
Investment Owned, at Cost $ 2,374 $ 2,374 $ 2,374 2,374        
Investment Owned, at Fair Value       $ 373        
Investment, Interest Rate, Paid in Kind 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Percent of net assets       0.10%   0.10%    
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan one                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:AmericanCraftsLCMember   whfcl:AmericanCraftsLCMember        
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment, Acquisition Date   Jan. 31, 2024   Jan. 31, 2024        
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026    
Investment Owned, Balance, Principal Amount $ 1,329 $ 1,329 $ 1,329 $ 1,287        
Investment Owned, at Cost $ 1,230 $ 1,230 $ 1,230 $ 1,230        
Investment, Interest Rate, Paid in Kind 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) Common Units One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanGpLlcMember   whfcl:ArcserveCaymanGpLlcMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Investment, Acquisition Date   Jan. 03, 2024   Jan. 03, 2024        
Investment Owned, Balance, Shares | shares 663,000 663,000 663,000 663 663,000 663    
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment, Acquisition Date   Jan. 03, 2024   Jan. 03, 2024        
Investment Maturity Date Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027 Jan. 04, 2027    
Investment Owned, Balance, Principal Amount $ 711 $ 711 $ 711 $ 689        
Investment Owned, at Cost 700 700 700 677        
Investment Owned, at Fair Value $ 1,244 $ 1,244 $ 1,244 $ 1,247        
Investment, Interest Rate, Paid in Kind 12.44% 12.44% 12.44% 12.67% 12.44% 12.67%    
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%    
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember        
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Spread Above Index 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%    
Investment, Acquisition Date   Jan. 03, 2024   Jan. 03, 2024        
Investment Maturity Date Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029    
Investment Owned, Balance, Principal Amount $ 594 $ 594 $ 594 $ 581        
Investment Owned, at Cost 583 583 583 569        
Investment Owned, at Fair Value $ 594 $ 594 $ 594 $ 581        
Investment, Interest Rate, Paid in Kind       9.00%   9.00%    
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC) Unsecured Loan Two                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanOpcoLpMember   whfcl:ArcserveCaymanOpcoLpMember        
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember whfcl:UnsecuredLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Spread Above Index 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%    
Investment, Acquisition Date   Jan. 03, 2024   Jan. 03, 2024        
Investment Maturity Date Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029 Jul. 02, 2029    
Investment Owned, Balance, Principal Amount $ 608 $ 608 $ 608 $ 594        
Investment Owned, at Cost 597 597 597 583        
Investment Owned, at Fair Value $ 608 $ 608 $ 608 $ 594        
Investment, Interest Rate, Paid in Kind       9.00%   9.00%    
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units Two                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcserveCaymanTopcoLpMember   whfcl:ArcserveCaymanTopcoLpMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Investment, Acquisition Date   Jan. 03, 2024   Jan. 03, 2024        
Investment Owned, Balance, Shares | shares 663,000 663,000 663,000 663 663,000 663    
Investment Owned, at Cost $ 19,568 $ 19,568 $ 19,568 $ 19,568        
Investment Owned, at Fair Value $ 9,121 $ 9,121 $ 9,121 $ 9,131        
Percent of net assets 3.20% 3.20% 3.20% 3.20% 3.20% 3.20%    
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArteriocyteMedicalSystemsInc.Member   whfcl:ArteriocyteMedicalSystemsInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 4.75% 4.75% 4.75% 5.00% 4.75% 5.00%    
Investment Interest Rate 9.05% 9.05% 9.05% 9.33% 9.05% 9.33%    
Investment, Acquisition Date   Oct. 25, 2023   Oct. 25, 2023        
Investment Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028    
Investment Owned, at Fair Value $ 9 $ 9 $ 9 $ 9        
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArteriocyteMedicalSystemsInc.Member   whfcl:ArteriocyteMedicalSystemsInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies Health Care Supplies    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 4.75% 4.75% 4.75% 5.00% 4.75% 5.00%    
Investment Interest Rate 9.05% 9.05% 9.05% 9.33% 9.05% 9.33%    
Investment, Acquisition Date   Oct. 25, 2023   Oct. 25, 2023        
Investment Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028    
Investment Owned, Balance, Principal Amount $ 4,959 $ 4,959 $ 4,959 $ 4,972        
Investment Owned, at Cost 4,871 4,871 4,871 4,877        
Investment Owned, at Fair Value $ 4,963 $ 4,963 $ 4,963 $ 5,021        
Fair Value As A Percentage of Member's Equity   14.60%   14.50%        
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Avision Holdings, LLC [Member]   Avision Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.45% 10.45% 10.45% 10.48% 10.45% 10.48%    
Investment, Acquisition Date   May 31, 2024   May 31, 2024        
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026    
Investment Owned, Balance, Principal Amount $ 552 $ 552 $ 552 $ 553        
Investment Owned, at Cost 544 544 544 545        
Investment Owned, at Fair Value $ 560 $ 560 $ 560 $ 558        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Avision Holdings, LLC (d/b/a Avision Sales Group) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Avision Holdings, LLC [Member]   Avision Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.45% 10.45% 10.45% 10.48% 10.45% 10.48%    
Investment, Acquisition Date   May 31, 2024   May 31, 2024        
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026    
Investment Owned, Balance, Principal Amount $ 657 $ 657 $ 657 $ 658        
Investment Owned, at Cost 648 648 648 648        
Investment Owned, at Fair Value $ 652 $ 652 $ 652 $ 652        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Avision Holdings, LLC [Member]   Avision Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember whfcl:ClassALLCInterestsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Acquisition Date   Dec. 15, 2021   Dec. 15, 2021        
Investment Owned, Balance, Shares | shares 200,000 200,000 200,000 200 200,000 200    
Investment Owned, at Cost $ 287 $ 287 $ 287 $ 287        
Investment Owned, at Fair Value $ 547 $ 547 $ 547 $ 577        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Spread Above Index 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%    
Investment Interest Rate 14.92% 14.92% 14.92% 14.96% 14.92% 14.96%    
Investment, Acquisition Date   Dec. 02, 2021   Dec. 02, 2021        
Investment Maturity Date Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025    
Investment Owned, Balance, Principal Amount $ 2,660 $ 2,660 $ 2,660 $ 2,654        
Investment Owned, at Cost 2,655 2,655 2,655 2,645        
Investment Owned, at Fair Value $ 2,648 $ 2,648 $ 2,648 $ 2,642        
Investment, Interest Rate, Paid in Kind 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%    
Investment, Interest Rate, Paid in Cash 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Percent of net assets 0.90% 0.90% 0.90% 0.90% 0.90% 0.90%    
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Spread Above Index 10.50% 10.50% 10.50% 10.50% 10.50% 10.50%    
Investment Interest Rate 14.92% 14.92% 14.92% 14.96% 14.92% 14.96%    
Investment, Acquisition Date   Aug. 28, 2020   Aug. 28, 2020        
Investment Maturity Date Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025    
Investment Owned, Balance, Principal Amount $ 13,046 $ 13,046 $ 13,046 $ 13,013        
Investment Owned, at Cost 13,021 13,021 13,021 12,972        
Investment Owned, at Fair Value $ 12,988 $ 12,988 $ 12,988 $ 12,955        
Investment, Interest Rate, Paid in Kind 2.00% 2.00% 2.00%   2.00%      
Investment, Interest Rate, Paid in Cash 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Percent of net assets 4.60% 4.60% 4.60% 4.50% 4.60% 4.50%    
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BBQBuyerLLCMember   whfcl:BBQBuyerLLCMember        
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances    
Investment, Acquisition Date   Aug. 28, 2020   Aug. 28, 2020        
Investment Owned, Balance, Shares | shares 1,100,000 1,100,000 1,100,000 1,100 1,100,000 1,100    
Investment Owned, at Cost $ 1,100 $ 1,100 $ 1,100 $ 1,100        
Investment Owned, at Fair Value $ 970 $ 970 $ 970 $ 907        
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%    
Investment, Identifier [Axis]: BL Products Parent, LP (d/b/a Bishop Lifting Products, Inc.) Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:BLProductsParentLPMember        
Investment, Type [Extensible Enumeration]       whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components    
Investment, Acquisition Date       Feb. 01, 2022        
Investment Owned, Balance, Shares | shares       733   733    
Investment Owned, at Cost       $ 788        
Investment Owned, at Fair Value       $ 1,012        
Percent of net assets       0.40%   0.40%    
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BLProductsParentLPMember            
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components      
Investment, Acquisition Date   Feb. 01, 2022            
Investment Owned, Balance, Shares | shares 733,000 733,000 733,000   733,000      
Investment Owned, at Cost $ 788 $ 788 $ 788          
Investment Owned, at Fair Value $ 1,012 $ 1,012 $ 1,012          
Percent of net assets 0.40% 0.40% 0.40%   0.40%      
Investment, Identifier [Axis]: BPII-JL Group Holdings LP (d/b/a Juniper Landscaping Holdings LLC) Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:BPII-JLGroupHoldingsLPMember        
Investment, Type [Extensible Enumeration]       whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Environmental & Facilities Services   Environmental & Facilities Services    
Investment, Acquisition Date       Dec. 29, 2021        
Investment Owned, Balance, Shares | shares       90   90    
Investment Owned, at Cost       $ 942        
Investment Owned, at Fair Value       $ 1,400        
Percent of net assets       0.50%   0.50%    
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BPII-JLGroupHoldingsLPMember            
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services   Environmental & Facilities Services      
Investment, Acquisition Date   Dec. 29, 2021            
Investment Owned, Balance, Shares | shares 90,000 90,000 90,000   90,000      
Investment Owned, at Cost $ 942 $ 942 $ 942          
Investment Owned, at Fair Value $ 1,434 $ 1,434 $ 1,434          
Percent of net assets 0.50% 0.50% 0.50%   0.50%      
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.69% 10.69% 10.69% 10.81% 10.69% 10.81%    
Investment, Acquisition Date   Apr. 04, 2024   Apr. 04, 2024        
Investment Maturity Date Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029    
Investment Owned, Balance, Principal Amount $ 276 $ 276 $ 276 $ 459        
Investment Owned, at Cost 269 269 269 447        
Investment Owned, at Fair Value $ 281 $ 281 $ 281 $ 461        
Percent of net assets 0.10% 0.10% 0.10% 0.20% 0.10% 0.20%    
Investment, Identifier [Axis]: BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]   Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.77% 10.77% 10.77% 10.77% 10.77% 10.77%    
Investment, Acquisition Date   Apr. 04, 2024   Apr. 04, 2024        
Investment Maturity Date Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029 Mar. 30, 2029    
Investment Owned, Balance, Principal Amount $ 7,678 $ 7,678 $ 7,678 $ 7,779        
Investment Owned, at Cost 7,493 7,493 7,493 7,580        
Investment Owned, at Fair Value $ 7,596 $ 7,596 $ 7,596 $ 7,691        
Percent of net assets 2.70% 2.70% 2.70% 2.70% 2.70% 2.70%    
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.57% 10.57% 10.57% 10.59% 10.57% 10.59%    
Investment, Acquisition Date   Dec. 21, 2023   Dec. 21, 2023        
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029    
Investment Owned, Balance, Principal Amount $ 1,909 $ 1,909 $ 1,909 $ 1,502        
Investment Owned, at Cost 1,874 1,874 1,874 1,472        
Investment Owned, at Fair Value $ 1,863 $ 1,863 $ 1,863 $ 1,477        
Fair Value As A Percentage of Member's Equity   5.50%   4.30%        
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.57% 10.57% 10.57% 10.61% 10.57% 10.61%    
Investment, Acquisition Date   Dec. 21, 2023   Dec. 21, 2023        
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029    
Investment Owned, Balance, Principal Amount       $ 420        
Investment Owned, at Cost       412        
Investment Owned, at Fair Value $ (6) $ (6) $ (6) $ 415        
Fair Value As A Percentage of Member's Equity       1.20%        
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerAcquisitionHoldingsLLCMember   whfcl:BannerAcquisitionHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.57% 10.57% 10.57% 10.61% 10.57% 10.61%    
Investment, Acquisition Date   Dec. 21, 2023   Dec. 21, 2023        
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029    
Investment Owned, Balance, Principal Amount $ 3,014 $ 3,014 $ 3,014 $ 3,033        
Investment Owned, at Cost 2,958 2,958 2,958 2,974        
Investment Owned, at Fair Value $ 2,941 $ 2,941 $ 2,941 $ 2,981        
Fair Value As A Percentage of Member's Equity   8.70%   8.60%        
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.31% 10.31% 10.31% 10.51% 10.31% 10.51%    
Investment, Acquisition Date   Jan. 10, 2024   Jan. 10, 2024        
Investment Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029    
Investment Owned, at Fair Value $ (2) $ (2) $ (2) $ (2)        
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Investment Interest Rate 12.50% 12.50% 12.50% 12.50% 12.50% 12.50%    
Investment, Acquisition Date   Jan. 10, 2024   Jan. 10, 2024        
Investment Maturity Date Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028    
Investment Owned, Balance, Principal Amount $ 142 $ 142 $ 142 $ 60        
Investment Owned, at Cost 139 139 139 58        
Investment Owned, at Fair Value $ 143 $ 143 $ 143 $ 63        
Fair Value As A Percentage of Member's Equity   0.40%   0.20%        
Investment, Identifier [Axis]: Barrett Purchaser LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BarrettPurchaserLlcMember   whfcl:BarrettPurchaserLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.31% 10.31% 10.31% 10.51% 10.31% 10.51%    
Investment, Acquisition Date   Jan. 10, 2024   Jan. 10, 2024        
Investment Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029    
Investment Owned, Balance, Principal Amount $ 3,608 $ 3,608 $ 3,608 $ 3,617        
Investment Owned, at Cost 3,538 3,538 3,538 3,543        
Investment Owned, at Fair Value $ 3,566 $ 3,566 $ 3,566 $ 3,574        
Fair Value As A Percentage of Member's Equity   10.50%   10.30%        
Investment, Identifier [Axis]: Basel U.S. Acquisition Co., Inc. First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BaselU.s.AcquisitionCo.Inc.Member   whfcl:BaselU.s.AcquisitionCo.Inc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Aerospace & Defense Aerospace & Defense Aerospace & Defense Aerospace & Defense Aerospace & Defense Aerospace & Defense    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%    
Investment Interest Rate 9.55% 9.55% 9.55% 9.94% 9.55% 9.94%    
Investment, Acquisition Date   Sep. 13, 2024   Sep. 13, 2024        
Investment Maturity Date Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028    
Investment Owned, at Fair Value $ 16 $ 16 $ 16 $ 7        
Investment, Identifier [Axis]: Basel U.S. Acquisition Co., Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BaselU.s.AcquisitionCo.Inc.Member   whfcl:BaselU.s.AcquisitionCo.Inc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Aerospace & Defense Aerospace & Defense Aerospace & Defense Aerospace & Defense Aerospace & Defense Aerospace & Defense    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%    
Investment Interest Rate 9.55% 9.55% 9.55% 9.94% 9.55% 9.94%    
Investment, Acquisition Date   Sep. 13, 2024   Sep. 13, 2024        
Investment Maturity Date Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028 Dec. 05, 2028    
Investment Owned, Balance, Principal Amount $ 3,672 $ 3,672 $ 3,672 $ 3,681        
Investment Owned, at Cost 3,626 3,626 3,626 3,633        
Investment Owned, at Fair Value $ 3,694 $ 3,694 $ 3,694 $ 3,675        
Fair Value As A Percentage of Member's Equity   11.00%   10.60%        
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BridgepointHealthcareLLCMember   whfcl:BridgepointHealthcareLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%    
Investment, Acquisition Date   Oct. 05, 2021   Oct. 05, 2021        
Investment Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026    
Investment Owned, Balance, Principal Amount $ 238 $ 238 $ 238 $ 238        
Investment Owned, at Cost 237 237 237 237        
Investment Owned, at Fair Value $ 238 $ 238 $ 238 $ 231        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BridgepointHealthcareLLCMember   whfcl:BridgepointHealthcareLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities Health Care Facilities    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%    
Investment, Acquisition Date   Oct. 05, 2021   Oct. 05, 2021        
Investment Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026    
Investment Owned, Balance, Principal Amount $ 8,378 $ 8,378 $ 8,378 $ 8,517        
Investment Owned, at Cost 8,327 8,327 8,327 8,457        
Investment Owned, at Fair Value $ 8,335 $ 8,335 $ 8,335 $ 8,429        
Percent of net assets 3.00% 3.00% 3.00% 2.90% 3.00% 2.90%    
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 5.00% 6.50% 5.00%    
Investment Interest Rate 10.92% 10.92% 10.92% 8.45% 10.92% 8.45%    
Investment, Acquisition Date   Aug. 09, 2023   Aug. 09, 2023        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 2,163 $ 2,163 $ 2,163 $ 2,168        
Investment Owned, at Cost 2,117 2,117 2,117 2,120        
Investment Owned, at Fair Value $ 2,174 $ 2,174 $ 2,174 $ 2,183        
Fair Value As A Percentage of Member's Equity   6.40%   6.30%        
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Aug. 09, 2023   Aug. 09, 2023        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 234 $ 234 $ 234 $ 234        
Investment Owned, at Cost 230 230 230 230        
Investment Owned, at Fair Value $ 247 $ 247 $ 247 $ 248        
Fair Value As A Percentage of Member's Equity   0.70%   0.70%        
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:BuckeyeAcquirorLlcMember   whfcl:BuckeyeAcquirorLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.42% 6.42% 6.42% 6.42% 6.42% 6.42%    
Investment Interest Rate 10.84% 10.84% 10.84% 10.88% 10.84% 10.88%    
Investment, Acquisition Date   Aug. 09, 2023   Aug. 09, 2023        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 6,886 $ 6,886 $ 6,886 $ 6,904        
Investment Owned, at Cost 6,764 6,764 6,764 6,774        
Investment Owned, at Fair Value $ 6,877 $ 6,877 $ 6,877 $ 6,952        
Fair Value As A Percentage of Member's Equity   20.30%   20.10%        
Investment, Identifier [Axis]: CX Holdco LLC Common Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CXHoldcoLLCMember   whfcl:CXHoldcoLLCMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Acquisition Date   May 04, 2021   May 04, 2021        
Investment Owned, Balance, Shares | shares 1,068,000 1,068,000 1,068,000 1,068,000 1,068,000 1,068,000    
Investment Owned, at Cost $ 1,116 $ 1,116 $ 1,116 $ 1,116        
Investment Owned, at Fair Value $ 1,883 $ 1,883 $ 1,883 $ 2,232        
Percent of net assets 0.70% 0.70% 0.70% 0.80% 0.70% 0.80%    
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Camarillo Fitness Holdings, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]   Leisure Facilities [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 4.50% 4.50% 4.50%   4.50%      
Spread Above Index 8.50% 8.50% 8.50%   8.50%      
Investment, Acquisition Date   Jan. 15, 2025            
Investment Maturity Date Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029   Sep. 25, 2029      
Investment Owned, Balance, Principal Amount $ 811 $ 811 $ 811          
Investment Owned, at Cost 811 811 811          
Investment Owned, at Fair Value $ 717 $ 717 $ 717          
Investment, Interest Rate, Paid in Kind 13.03% 13.03% 13.03%   13.03%      
Percent of net assets 0.30% 0.30% 0.30%   0.30%      
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Camarillo Fitness Holdings, LLC [Member]   Camarillo Fitness Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment, Acquisition Date   Sep. 25, 2024   Sep. 25, 2024        
Investment Maturity Date Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029 Sep. 25, 2029    
Investment Owned, Balance, Principal Amount $ 12,140 $ 12,140 $ 12,140 $ 11,738        
Investment Owned, at Cost 10,231 10,231 10,231 10,269        
Investment Owned, at Fair Value $ 10,742 $ 10,742 $ 10,742 $ 10,492        
Investment, Interest Rate, Paid in Kind 12.95% 12.95% 12.95% 12.98% 12.95% 12.98%    
Percent of net assets 3.80% 3.80% 3.80% 3.70% 3.80% 3.70%    
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC (d/b/a Camp Construction Services, Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:CampFacilityServicesHoldingsLLCMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Real Estate Services   Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       1.00%   1.00%    
Spread Above Index       6.50%   6.50%    
Investment Interest Rate       10.96%   10.96%    
Investment, Acquisition Date       Nov. 16, 2021        
Investment Maturity Date       Nov. 16, 2027   Nov. 16, 2027    
Investment Owned, Balance, Principal Amount       $ 10,424        
Investment Owned, at Cost       10,325        
Investment Owned, at Fair Value       $ 9,905        
Percent of net assets       3.50%   3.50%    
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CampFacilityServicesHoldingsLLCMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services   Real Estate Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 6.50% 6.50% 6.50%   6.50%      
Investment Interest Rate 10.92% 10.92% 10.92%   10.92%      
Investment, Acquisition Date   Nov. 16, 2021            
Investment Maturity Date Nov. 16, 2027 Nov. 16, 2027 Nov. 16, 2027   Nov. 16, 2027      
Investment Owned, Balance, Principal Amount $ 10,392 $ 10,392 $ 10,392          
Investment Owned, at Cost 10,301 10,301 10,301          
Investment Owned, at Fair Value $ 9,773 $ 9,773 $ 9,773          
Percent of net assets 3.50% 3.50% 3.50%   3.50%      
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CampFacilityServicesParentLLCMember   whfcl:CampFacilityServicesParentLLCMember        
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estates [Member] Real Estates [Member] Real Estates [Member] Real Estate Services Real Estates [Member] Real Estate Services    
Spread Above Index 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%    
Investment, Acquisition Date   Nov. 16, 2021   Nov. 16, 2021        
Investment Owned, Balance, Shares | shares 15,000 15,000 15,000 15 15,000 15    
Investment Owned, at Cost $ 840 $ 840 $ 840 $ 840        
Investment Owned, at Fair Value $ 92 $ 92 $ 92 $ 162        
Percent of net assets       0.10%   0.10%    
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember   whfcl:CennoxHoldingsLimitedMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%    
Investment Interest Rate 10.32% 10.32% 10.32% 10.40% 10.32% 10.40%    
Investment, Acquisition Date   Sep. 11, 2024   Sep. 11, 2024        
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029    
Investment Owned, at Fair Value $ 2 $ 2 $ 2 $ 2        
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%   0.25%      
Investment, Interest Rate, Paid in Cash 10.07% 10.07% 10.07%   10.07%      
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember   whfcl:CennoxHoldingsLimitedMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member] Sterling Overnight Index Average [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%    
Investment Interest Rate 10.32% 10.32% 10.32% 10.40% 10.32% 10.40%    
Investment, Acquisition Date   Sep. 11, 2024   Sep. 11, 2024        
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029    
Investment Owned, Balance, Principal Amount $ 512 $ 512 $ 512 $ 513        
Investment Owned, at Cost 664 664 664 665        
Investment Owned, at Fair Value $ 664 $ 664 $ 664 $ 643        
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%   0.25%      
Investment, Interest Rate, Paid in Cash 10.07% 10.07% 10.07%   10.07%      
Fair Value As A Percentage of Member's Equity   2.00%   1.90%        
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member   whfcl:CennoxInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%    
Investment Interest Rate 10.12% 10.12% 10.12% 10.25% 10.12% 10.25%    
Investment, Acquisition Date   Sep. 11, 2024   Sep. 11, 2024        
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029    
Investment Owned, Balance, Principal Amount $ 97 $ 97 $ 97 $ 29        
Investment Owned, at Cost 96 96 96 29        
Investment Owned, at Fair Value $ 97 $ 97 $ 97 $ 30        
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%   0.25%      
Investment, Interest Rate, Paid in Cash 9.87% 9.87% 9.87%   9.87%      
Fair Value As A Percentage of Member's Equity   0.30%   0.10%        
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member   whfcl:CennoxInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 5.75% 6.00% 5.75%    
Investment Interest Rate 8.39% 8.39% 8.39% 9.14% 8.39% 9.14%    
Investment, Acquisition Date   Sep. 11, 2024   Sep. 11, 2024        
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029    
Investment Owned, Balance, Principal Amount $ 593 $ 593 $ 593 $ 594        
Investment Owned, at Cost 648 648 648 649        
Investment Owned, at Fair Value $ 636 $ 636 $ 636 $ 611        
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%   0.25%      
Investment, Interest Rate, Paid in Cash 8.14% 8.14% 8.14%   8.14%      
Fair Value As A Percentage of Member's Equity   1.90%   1.80%        
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member   whfcl:CennoxInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.50% 5.75% 5.50%    
Investment Interest Rate 10.10% 10.10% 10.10% 10.34% 10.10% 10.34%    
Investment, Acquisition Date   Sep. 11, 2024   Sep. 11, 2024        
Investment Maturity Date May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029 May 04, 2029    
Investment Owned, Balance, Principal Amount $ 3,341 $ 3,341 $ 3,341 $ 3,350        
Investment Owned, at Cost 3,312 3,312 3,312 3,319        
Investment Owned, at Fair Value $ 3,341 $ 3,341 $ 3,341 $ 3,344        
Investment, Interest Rate, Paid in Kind 0.25% 0.25% 0.25%   0.25%      
Investment, Interest Rate, Paid in Cash 9.85% 9.85% 9.85%   9.85%      
Fair Value As A Percentage of Member's Equity   9.80%   9.70%        
Investment, Identifier [Axis]: Chase Products Co. (f/k/a Starco) Second Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ChaseProductsCoMember   whfcl:ChaseProductsCoMember        
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member]    
Spread Above Index 12.00% 12.00% 12.00% 12.00% 12.00% 12.00%    
Investment, Acquisition Date   Mar. 16, 2023   Mar. 16, 2023        
Investment Maturity Date Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028 Mar. 16, 2028    
Investment Owned, Balance, Principal Amount $ 3,442 $ 3,442 $ 3,442 $ 3,342        
Investment Owned, at Cost 3,442 3,442 3,442 3,342        
Investment Owned, at Fair Value $ 3,442 $ 3,442 $ 3,442 $ 3,342       2,793
Investment, Interest Rate, Paid in Kind 12.00% 12.00% 12.00%   12.00%      
Percent of net assets 1.20% 1.20% 1.20% 1.20% 1.20% 1.20%    
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ClaridgeProductsandEquipmentLLCMember   whfcl:ClaridgeProductsandEquipmentLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.31% 8.31% 8.31% 8.31% 8.31% 8.31%    
Investment Interest Rate 14.10% 14.10% 14.10% 14.13% 14.10% 14.13%    
Investment, Acquisition Date   Dec. 30, 2020   Dec. 30, 2020        
Investment Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025    
Investment Owned, Balance, Principal Amount $ 632 $ 632 $ 632 $ 632        
Investment Owned, at Cost 630 630 630 630        
Investment Owned, at Fair Value $ 554 $ 554 $ 554 $ 555        
Investment, Interest Rate, Paid in Kind 2.25% 2.25% 2.25% 2.25% 2.25% 2.25%    
Investment, Interest Rate, Paid in Cash 11.85% 11.85% 11.85% 11.88% 11.85% 11.88%    
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ClaridgeProductsandEquipmentLLCMember   whfcl:ClaridgeProductsandEquipmentLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member] Construction Materials [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.75% 8.75% 8.75% 8.75% 8.75% 8.75%    
Investment Interest Rate 13.17% 13.17% 13.17% 13.21% 13.17% 13.21%    
Investment, Acquisition Date   Dec. 30, 2020   Dec. 30, 2020        
Investment Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025    
Investment Owned, Balance, Principal Amount $ 5,747 $ 5,747 $ 5,747 $ 5,711        
Investment Owned, at Cost 5,731 5,731 5,731 5,690        
Investment Owned, at Fair Value $ 5,114 $ 5,114 $ 5,114 $ 5,085        
Investment, Interest Rate, Paid in Kind 2.25% 2.25% 2.25% 2.25% 2.25% 2.25%    
Investment, Interest Rate, Paid in Cash 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Percent of net assets 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%    
Investment, Identifier [Axis]: Clark Restaurant Service, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ClarkRestaurantServiceLlcMember   whfcl:ClarkRestaurantServiceLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.07% 10.07% 10.07% 10.11% 10.07% 10.11%    
Investment, Acquisition Date   Jun. 14, 2024   Jun. 14, 2024        
Investment Maturity Date May 10, 2029 May 10, 2029 May 10, 2029 May 10, 2029 May 10, 2029 May 10, 2029    
Investment Owned, Balance, Principal Amount $ 4,994 $ 4,994 $ 4,994 $ 5,006        
Investment Owned, at Cost 4,911 4,911 4,911 4,919        
Investment Owned, at Fair Value $ 4,981 $ 4,981 $ 4,981 $ 4,993        
Fair Value As A Percentage of Member's Equity   14.70%   14.40%        
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CleanChoiceEnergyIncMember   whfcl:CleanChoiceEnergyIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Electric Utilities [Member] Electric Utilities [Member] Electric Utilities [Member] Electric Utilities [Member] Electric Utilities [Member] Electric Utilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.59% 7.59% 7.59% 7.59% 7.59% 7.59%    
Investment Interest Rate 12.04% 12.04% 12.04% 12.39% 12.04% 12.39%    
Investment, Acquisition Date   Oct. 12, 2021   Oct. 12, 2021        
Investment Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026    
Investment Owned, Balance, Principal Amount $ 15,955 $ 15,955 $ 15,955 $ 15,955        
Investment Owned, at Cost 15,823 15,823 15,823 15,802        
Investment Owned, at Fair Value $ 16,042 $ 16,042 $ 16,042 $ 16,032        
Percent of net assets 5.70% 5.70% 5.70% 5.60% 5.70% 5.60%    
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CoastalTelevisionBroadcastingGroupLLCMember   whfcl:CoastalTelevisionBroadcastingGroupLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Dec. 30, 2021   Dec. 30, 2021        
Investment Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026    
Investment Owned, at Fair Value $ 1 $ 1 $ 1 $ 1        
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CoastalTelevisionBroadcastingGroupLLCMember   whfcl:CoastalTelevisionBroadcastingGroupLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Dec. 30, 2021   Dec. 30, 2021        
Investment Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026    
Investment Owned, Balance, Principal Amount $ 7,546 $ 7,546 $ 7,546 $ 7,879        
Investment Owned, at Cost 7,486 7,486 7,486 7,808        
Investment Owned, at Fair Value $ 7,515 $ 7,515 $ 7,515 $ 7,832        
Percent of net assets 2.70% 2.70% 2.70% 2.70% 2.70% 2.70%    
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:DrewFoamCompaniesIncMember   whfcl:DrewFoamCompaniesIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products Building Products Building Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.45% 10.45% 10.45% 10.48% 10.45% 10.48%    
Investment, Acquisition Date   Nov. 09, 2020   Nov. 09, 2020        
Investment Maturity Date Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026    
Investment Owned, Balance, Principal Amount $ 13,465 $ 13,465 $ 13,465 $ 13,501        
Investment Owned, at Cost 13,416 13,416 13,416 13,445        
Investment Owned, at Fair Value $ 13,372 $ 13,372 $ 13,372 $ 13,437        
Fair Value As A Percentage of Member's Equity   39.40%   38.80%        
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:E-PhoenixAcquisitionCo.Inc.Member   whfcl:E-PhoenixAcquisitionCo.Inc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 9.95% 9.95% 9.95% 9.98% 9.95% 9.98%    
Investment, Acquisition Date   Jul. 15, 2021   Jul. 15, 2021        
Investment Maturity Date Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027 Jun. 23, 2027    
Investment Owned, Balance, Principal Amount $ 8,320 $ 8,320 $ 8,320 $ 8,342        
Investment Owned, at Cost 8,281 8,281 8,281 8,299        
Investment Owned, at Fair Value $ 8,320 $ 8,320 $ 8,320 $ 8,342        
Fair Value As A Percentage of Member's Equity   24.50%   24.10%        
Investment, Identifier [Axis]: ELM One Call Locators, Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ElmOneCallLocatorsInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 6.25% 6.25% 6.25%   6.25%      
Investment Interest Rate 10.58% 10.58% 10.58%   10.58%      
Investment, Acquisition Date   Feb. 12, 2025            
Investment Maturity Date Feb. 12, 2030 Feb. 12, 2030 Feb. 12, 2030   Feb. 12, 2030      
Investment, Identifier [Axis]: ELM One Call Locators, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ElmOneCallLocatorsInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 6.25% 6.25% 6.25%   6.25%      
Investment Interest Rate 10.58% 10.58% 10.58%   10.58%      
Investment, Acquisition Date   Feb. 12, 2025            
Investment Maturity Date Feb. 12, 2030 Feb. 12, 2030 Feb. 12, 2030   Feb. 12, 2030      
Investment Owned, Balance, Principal Amount $ 7,650 $ 7,650 $ 7,650          
Investment Owned, at Cost 7,501 7,501 7,501          
Investment Owned, at Fair Value $ 7,501 $ 7,501 $ 7,501          
Percent of net assets 2.70% 2.70% 2.70%   2.70%      
Investment, Identifier [Axis]: Eddy Acquisitions, LLC (d/b/a EducationDynamics, LLC) Preferred Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:EddyAcquisitionsLLCMember        
Investment, Type [Extensible Enumeration]       whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Education Services [Member]   Education Services [Member]    
Spread Above Index       12.00%   12.00%    
Investment, Acquisition Date       Sep. 15, 2021        
Investment Owned, Balance, Shares | shares       167   167    
Investment Owned, at Cost       $ 167        
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:EddyAcquisitionsLLCMember            
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember   whfcl:PreferredUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member]   Education Services [Member]      
Spread Above Index 12.00% 12.00% 12.00%   12.00%      
Investment, Acquisition Date   Sep. 15, 2021            
Investment Owned, Balance, Shares | shares 167,000 167,000 167,000   167,000      
Investment Owned, at Cost $ 167 $ 167 $ 167          
Investment, Identifier [Axis]: Education Dynamics, LLC Senior Preferred Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember whfcl:SeniorPreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member]    
Investment, Acquisition Date   Sep. 15, 2021   Sep. 15, 2021        
Investment Owned, Balance, Shares | shares 167,000 167,000 167,000 167 167,000 167    
Investment Owned, at Cost $ 167 $ 167 $ 167 $ 167        
Investment Owned, at Fair Value $ 127 $ 127 $ 127 $ 100        
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.93% 10.93% 10.93% 10.96% 10.93% 10.96%    
Investment, Acquisition Date   Sep. 15, 2021   Sep. 15, 2021        
Investment Maturity Date Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027    
Investment Owned, at Fair Value $ (46) $ (46) $ (46) $ (51)        
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember   whfcl:EducationDynamicsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.93% 10.93% 10.93% 10.96% 10.93% 10.96%    
Investment, Acquisition Date   Sep. 15, 2021   Sep. 15, 2021        
Investment Maturity Date Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027 Sep. 15, 2027    
Investment Owned, Balance, Principal Amount $ 13,001 $ 13,001 $ 13,001 $ 13,089        
Investment Owned, at Cost 12,912 12,912 12,912 12,989        
Investment Owned, at Fair Value $ 12,428 $ 12,428 $ 12,428 $ 12,449        
Percent of net assets 4.40% 4.40% 4.40% 4.30% 4.40% 4.30%    
Investment, Identifier [Axis]: Event Services America, Inc. (d/b/a Contemporary Services Corporation) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:EventServicesAmericaIncMember   whfcl:EventServicesAmericaIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Security & Alarm Services [Member] Security & Alarm Services [Member] Security & Alarm Services [Member] Security & Alarm Services [Member] Security & Alarm Services [Member] Security & Alarm Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.07% 11.07% 11.07% 11.11% 11.07% 11.11%    
Investment, Acquisition Date   Jan. 31, 2024   Jan. 31, 2024        
Investment Maturity Date Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029 Jan. 31, 2029    
Investment Owned, Balance, Principal Amount $ 6,983 $ 6,983 $ 6,983 $ 7,000        
Investment Owned, at Cost 6,849 6,849 6,849 6,857        
Investment Owned, at Fair Value $ 7,052 $ 7,052 $ 7,052 $ 7,070        
Percent of net assets 2.50% 2.50% 2.50% 2.50% 2.50% 2.50%    
Investment, Identifier [Axis]: FGI Acquisition Corp. (d/b/a Flexitallic Group SAS) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:FgiAcquisitionCorpMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Commodity Chemicals [Member] Commodity Chemicals [Member] Commodity Chemicals [Member]   Commodity Chemicals [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 6.50% 6.50% 6.50%   6.50%      
Investment Interest Rate 10.95% 10.95% 10.95%   10.95%      
Investment, Acquisition Date   Oct. 28, 2019            
Investment Maturity Date Oct. 29, 2026 Oct. 29, 2026 Oct. 29, 2026   Oct. 29, 2026      
Investment Owned, Balance, Principal Amount $ 15,985 $ 15,985 $ 15,985          
Investment Owned, at Cost 15,759 15,759 15,759          
Investment Owned, at Fair Value $ 15,985 $ 15,985 $ 15,985          
Percent of net assets 5.70% 5.70% 5.70%   5.70%      
Investment, Identifier [Axis]: FGI Acquisition Corp. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:FgiAcquisitionCorpMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Commodity Chemicals [Member]   Commodity Chemicals [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       1.00%   1.00%    
Spread Above Index       6.50%   6.50%    
Investment Interest Rate       10.98%   10.98%    
Investment, Acquisition Date       Oct. 28, 2019        
Investment Maturity Date       Oct. 29, 2026   Oct. 29, 2026    
Investment Owned, Balance, Principal Amount       $ 16,026        
Investment Owned, at Cost       15,765        
Investment Owned, at Fair Value       $ 16,026        
Percent of net assets       5.60%   5.60%    
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:FloworksInternationalLlcMember   whfcl:FloworksInternationalLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 4.75% 4.75% 4.75% 5.75% 4.75% 5.75%    
Investment Interest Rate 9.07% 9.07% 9.07% 10.40% 9.07% 10.40%    
Investment, Acquisition Date   Dec. 12, 2024   Dec. 12, 2024        
Investment Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031    
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:FloworksInternationalLlcMember   whfcl:FloworksInternationalLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Spread Above Index 4.75% 4.75% 4.75% 4.75% 4.75% 4.75%    
Investment Interest Rate 9.07% 9.07% 9.07% 9.27% 9.07% 9.27%    
Investment, Acquisition Date   Dec. 12, 2024   Dec. 12, 2024        
Investment Maturity Date Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031 Nov. 26, 2031    
Investment Owned, Balance, Principal Amount $ 5,333 $ 5,333 $ 5,333 $ 5,333        
Investment Owned, at Cost 5,282 5,282 5,282 5,280        
Investment Owned, at Fair Value $ 5,279 $ 5,279 $ 5,279 $ 5,281        
Fair Value As A Percentage of Member's Equity   15.60%   15.30%        
Investment, Identifier [Axis]: Foodservices Brand Group, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:FoodservicesBrandGroupLlcMember   whfcl:FoodservicesBrandGroupLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.62% 12.62% 12.62% 12.62% 12.62% 12.62%    
Investment, Acquisition Date   Nov. 22, 2022   Nov. 22, 2022        
Investment Maturity Date Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025    
Investment Owned, Balance, Principal Amount $ 357 $ 357 $ 357 $ 357        
Investment Owned, at Cost 357 357 357 357        
Investment Owned, at Fair Value $ 321 $ 321 $ 321 $ 321        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%    
Investment, Acquisition Date   Mar. 11, 2022   Mar. 11, 2022        
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026    
Investment Owned, Balance, Principal Amount $ 3,016 $ 3,016 $ 3,016 $ 3,023        
Investment Owned, at Cost 2,995 2,995 2,995 3,000        
Investment Owned, at Fair Value $ 3,016 $ 3,016 $ 3,016 $ 3,023        
Fair Value As A Percentage of Member's Equity   8.90%   8.70%        
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%    
Investment, Acquisition Date   Feb. 18, 2022   Feb. 18, 2022        
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026    
Investment Owned, at Fair Value $ 4 $ 4 $ 4 $ 5        
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ForwardSolutionsLlcMember   whfcl:ForwardSolutionsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%    
Investment, Acquisition Date   Feb. 18, 2022   Feb. 18, 2022        
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026    
Investment Owned, Balance, Principal Amount $ 8,984 $ 8,984 $ 8,984 $ 9,007        
Investment Owned, at Cost 8,923 8,923 8,923 8,937        
Investment Owned, at Fair Value $ 8,984 $ 8,984 $ 8,984 $ 9,007        
Fair Value As A Percentage of Member's Equity   26.60%   26.10%        
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:FuturePaymentTechnologiesLPMember   whfcl:FuturePaymentTechnologiesLPMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.25% 8.25% 8.25% 8.25% 8.25% 8.25%    
Investment Interest Rate 12.67% 12.67% 12.67% 12.90% 12.67% 12.90%    
Investment, Acquisition Date   Dec. 23, 2016   Dec. 23, 2016        
Investment Maturity Date Dec. 07, 2026 Dec. 07, 2026 Dec. 07, 2026 Dec. 05, 2025 Dec. 07, 2026 Dec. 05, 2025    
Investment Owned, Balance, Principal Amount $ 20,109 $ 20,109 $ 20,109 $ 20,420        
Investment Owned, at Cost 20,081 20,081 20,081 20,382        
Investment Owned, at Fair Value $ 20,109 $ 20,109 $ 20,109 $ 20,420        
Percent of net assets 7.10% 7.10% 7.10% 7.10% 7.10% 7.10%    
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:G2LatherAcquisitionCorp.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products   Personal Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.32% 9.32% 9.32%   9.32%      
Investment, Acquisition Date   Mar. 05, 2025            
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031      
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:G2LatherAcquisitionCorp.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products   Personal Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.32% 9.32% 9.32%   9.32%      
Investment, Acquisition Date   Mar. 05, 2025            
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031      
Investment, Identifier [Axis]: G-2 Lather Acquisition Corp. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:G2LatherAcquisitionCorp.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Personal Products Personal Products Personal Products   Personal Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.32% 9.32% 9.32%   9.32%      
Investment, Acquisition Date   Mar. 05, 2025            
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031      
Investment Owned, Balance, Principal Amount $ 3,929 $ 3,929 $ 3,929          
Investment Owned, at Cost 3,872 3,872 3,872          
Investment Owned, at Fair Value $ 3,872 $ 3,872 $ 3,872          
Fair Value As A Percentage of Member's Equity   11.40%            
Investment, Identifier [Axis]: Geo Logic Systems Ltd.First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:GeoLogicSystemsLtdMember   whfcl:GeoLogicSystemsLtdMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 8.98% 8.98% 8.98% 9.49% 8.98% 9.49%    
Investment, Acquisition Date   Jan. 22, 2020   Jan. 22, 2020        
Investment Maturity Date Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026    
Investment Owned, at Fair Value $ 1 $ 1 $ 1 $ 2        
Investment, Identifier [Axis]: Geo Logic Systems Ltd.First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:GeoLogicSystemsLtdMember   whfcl:GeoLogicSystemsLtdMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 8.98% 8.98% 8.98% 9.49% 8.98% 9.49%    
Investment, Acquisition Date   Jan. 22, 2020   Jan. 22, 2020        
Investment Maturity Date Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026 Dec. 21, 2026    
Investment Owned, Balance, Principal Amount $ 18,279 $ 18,279 $ 18,279 $ 18,415        
Investment Owned, at Cost 14,135 14,135 14,135 14,234        
Investment Owned, at Fair Value $ 12,703 $ 12,703 $ 12,703 $ 12,883        
Fair Value As A Percentage of Member's Equity   37.40%   37.20%        
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:GulfWindsInternationalAcquisitionLlcMember   whfcl:GulfWindsInternationalAcquisitionLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment Interest Rate 11.92% 11.92% 11.92% 11.95% 11.92% 11.95%    
Investment, Acquisition Date   Dec. 16, 2022   Dec. 16, 2022        
Investment Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028    
Investment Owned, Balance, Principal Amount $ 647 $ 647 $ 647 $ 453        
Investment Owned, at Cost 635 635 635 444        
Investment Owned, at Fair Value $ 631 $ 631 $ 631 $ 447        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:GulfWindsInternationalAcquisitionLlcMember   whfcl:GulfWindsInternationalAcquisitionLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.50% 7.50% 7.50% 7.60% 7.50% 7.60%    
Investment Interest Rate 11.92% 11.92% 11.92% 11.96% 11.92% 11.96%    
Investment, Acquisition Date   Dec. 16, 2022   Dec. 16, 2022        
Investment Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028    
Investment Owned, Balance, Principal Amount $ 8,971 $ 8,971 $ 8,971 $ 8,994        
Investment Owned, at Cost 8,800 8,800 8,800 8,811        
Investment Owned, at Fair Value $ 8,746 $ 8,746 $ 8,746 $ 8,857        
Percent of net assets 3.10% 3.10% 3.10% 3.10% 3.10% 3.10%    
Investment, Identifier [Axis]: H I G Camarillo, LP, Limited Partners Interests                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:HIGCamarilloLpMember   whfcl:HIGCamarilloLpMember        
Investment, Type [Extensible Enumeration] whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember whfcl:LimitedPartnerInterestsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Investment, Acquisition Date   Sep. 25, 2024   Sep. 25, 2024        
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.22% 6.22% 6.22% 6.97% 6.22% 6.97%    
Investment Interest Rate 11.01% 11.01% 11.01% 11.29% 11.01% 11.29%    
Investment, Acquisition Date   Feb. 18, 2022   Feb. 18, 2022        
Investment Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026    
Investment Owned, Balance, Principal Amount $ 1,392 $ 1,392 $ 1,392 $ 1,395        
Investment Owned, at Cost 1,383 1,383 1,383 1,384        
Investment Owned, at Fair Value $ 1,352 $ 1,352 $ 1,352 $ 1,354        
Fair Value As A Percentage of Member's Equity   4.00%   3.90%        
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.69% 10.69% 10.69% 11.02% 10.69% 11.02%    
Investment, Acquisition Date   Feb. 18, 2022   Feb. 18, 2022        
Investment Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026    
Investment Owned, Balance, Principal Amount $ 602 $ 602 $ 602 $ 483        
Investment Owned, at Cost 599 599 599 480        
Investment Owned, at Fair Value $ 573 $ 573 $ 573 $ 455        
Fair Value As A Percentage of Member's Equity   1.70%   1.30%        
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:HRGManagementLLCMember   whfcl:HRGManagementLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.69% 10.69% 10.69% 11.02% 10.69% 11.02%    
Investment, Acquisition Date   Dec. 28, 2021   Dec. 28, 2021        
Investment Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026    
Investment Owned, Balance, Principal Amount $ 5,551 $ 5,551 $ 5,551 $ 5,563        
Investment Owned, at Cost 5,517 5,517 5,517 5,523        
Investment Owned, at Fair Value $ 5,386 $ 5,386 $ 5,386 $ 5,395        
Fair Value As A Percentage of Member's Equity   15.90%   15.60%        
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ITSBuyerIncMember   whfcl:ITSBuyerIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 10.05% 10.05% 10.05% 10.35% 10.05% 10.35%    
Investment, Acquisition Date   Feb. 17, 2022   Feb. 17, 2022        
Investment Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026    
Investment Owned, at Fair Value $ 3 $ 3 $ 3 $ 4        
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ITSBuyerIncMember   whfcl:ITSBuyerIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 10.05% 10.05% 10.05% 10.35% 10.05% 10.35%    
Investment, Acquisition Date   Feb. 17, 2022   Feb. 17, 2022        
Investment Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026    
Investment Owned, Balance, Principal Amount $ 3,298 $ 3,298 $ 3,298 $ 3,307        
Investment Owned, at Cost 3,281 3,281 3,281 3,286        
Investment Owned, at Fair Value $ 3,300 $ 3,300 $ 3,300 $ 3,307        
Fair Value As A Percentage of Member's Equity   9.70%   9.60%        
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Ribbon Communications Operating Company, Inc. [Member]   whfcl:ImageOneIndustriesLLCMember        
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:CommonAUnitsMember whfcl:ClassAUnitsMember whfcl:CommonAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Acquisition Date   Sep. 20, 2019   Sep. 20, 2019        
Investment Owned, Balance, Shares | shares 235,000 235,000 235,000 235 235,000 235    
Investment Owned, at Cost $ 10 $ 10 $ 10 $ 10        
Investment Owned, at Fair Value $ 12 $ 12 $ 12 $ 12        
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Impact Advisors, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Health Care Technology [Member] Health Care Technology [Member] Health Care Technology [Member]   Health Care Technology [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 4.75% 4.75% 4.75%   4.75%      
Investment Interest Rate 9.06% 9.06% 9.06%   9.06%      
Investment, Acquisition Date   Mar. 21, 2025            
Investment Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031   Mar. 21, 2031      
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Impact Advisors, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Health Care Technology [Member] Health Care Technology [Member] Health Care Technology [Member]   Health Care Technology [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 4.75% 4.75% 4.75%   4.75%      
Investment Interest Rate 9.06% 9.06% 9.06%   9.06%      
Investment, Acquisition Date   Mar. 21, 2025            
Investment Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031   Mar. 21, 2031      
Investment, Identifier [Axis]: Impact Advisors, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Impact Advisors, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Health Care Technology [Member] Health Care Technology [Member] Health Care Technology [Member]   Health Care Technology [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 4.75% 4.75% 4.75%   4.75%      
Investment Interest Rate 9.06% 9.06% 9.06%   9.06%      
Investment, Acquisition Date   Mar. 21, 2025            
Investment Maturity Date Mar. 21, 2031 Mar. 21, 2031 Mar. 21, 2031   Mar. 21, 2031      
Investment Owned, Balance, Principal Amount $ 4,200 $ 4,200 $ 4,200          
Investment Owned, at Cost 4,158 4,158 4,158          
Investment Owned, at Fair Value $ 4,158 $ 4,158 $ 4,158          
Percent of net assets 1.50% 1.50% 1.50%   1.50%      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.75% 5.75% 5.75%   5.75%      
Investment Interest Rate 10.05% 10.05% 10.05%   10.05%      
Investment, Acquisition Date   Feb. 19, 2025            
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Revolving Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.75% 5.75% 5.75%   5.75%      
Investment Interest Rate 10.05% 10.05% 10.05%   10.05%      
Investment, Acquisition Date   Mar. 24, 2025            
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.75% 5.75% 5.75%   5.75%      
Investment Interest Rate 10.05% 10.05% 10.05%   10.05%      
Investment, Acquisition Date   Feb. 19, 2025            
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030      
Investment Owned, Balance, Principal Amount $ 2,970 $ 2,970 $ 2,970          
Investment Owned, at Cost 2,912 2,912 2,912          
Investment Owned, at Fair Value $ 2,912 $ 2,912 $ 2,912          
Percent of net assets 1.00% 1.00% 1.00%   1.00%      
Investment, Identifier [Axis]: Infotree Holdco LLC First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Infotree Holdco LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Human Resource & Employment Services Human Resource & Employment Services Human Resource & Employment Services   Human Resource & Employment Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.75% 5.75% 5.75%   5.75%      
Investment Interest Rate 10.05% 10.05% 10.05%   10.05%      
Investment, Acquisition Date   Mar. 24, 2025            
Investment Maturity Date Feb. 19, 2030 Feb. 19, 2030 Feb. 19, 2030   Feb. 19, 2030      
Investment Owned, Balance, Principal Amount $ 2,545 $ 2,545 $ 2,545          
Investment Owned, at Cost 2,496 2,496 2,496          
Investment Owned, at Fair Value $ 2,496 $ 2,496 $ 2,496          
Fair Value As A Percentage of Member's Equity   7.40%            
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.81% 10.81% 10.81% 10.85% 10.81% 10.85%    
Investment, Acquisition Date   Mar. 01, 2022   Mar. 01, 2022        
Investment Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026    
Investment Owned, Balance, Principal Amount $ 2,337 $ 2,337 $ 2,337 $ 2,343        
Investment Owned, at Cost 2,322 2,322 2,322 2,326        
Investment Owned, at Fair Value $ 2,337 $ 2,337 $ 2,337 $ 2,343        
Fair Value As A Percentage of Member's Equity   6.90%   6.80%        
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.77% 10.77% 10.77% 10.82% 10.77% 10.82%    
Investment, Acquisition Date   Mar. 01, 2022   Mar. 01, 2022        
Investment Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026    
Investment Owned, Balance, Principal Amount $ 517 $ 517 $ 517 $ 517        
Investment Owned, at Cost 514 514 514 513        
Investment Owned, at Fair Value $ 521 $ 521 $ 521 $ 522        
Fair Value As A Percentage of Member's Equity   1.50%   1.50%        
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:JuniperLandscapingHoldingsLLCMember   whfcl:JuniperLandscapingHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.81% 10.81% 10.81% 10.84% 10.81% 10.84%    
Investment, Acquisition Date   Mar. 01, 2022   Mar. 01, 2022        
Investment Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026    
Investment Owned, Balance, Principal Amount $ 11,049 $ 11,049 $ 11,049 $ 11,078        
Investment Owned, at Cost 10,981 10,981 10,981 11,000        
Investment Owned, at Fair Value $ 11,049 $ 11,049 $ 11,049 $ 11,078        
Fair Value As A Percentage of Member's Equity   32.60%   32.00%        
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:KoreWirelessGroupIncMember   whfcl:KoreWirelessGroupIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.82% 10.82% 10.82% 11.02% 10.82% 11.02%    
Investment, Acquisition Date   Nov. 27, 2023   Nov. 27, 2023        
Investment Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028    
Investment Owned, at Fair Value $ 8 $ 8 $ 8 $ 9        
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:KoreWirelessGroupIncMember   whfcl:KoreWirelessGroupIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services Wireless Telecommunication Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.82% 10.82% 10.82% 11.02% 10.82% 11.02%    
Investment, Acquisition Date   Nov. 27, 2023   Nov. 27, 2023        
Investment Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028    
Investment Owned, Balance, Principal Amount $ 6,338 $ 6,338 $ 6,338 $ 6,354        
Investment Owned, at Cost 6,246 6,246 6,246 6,256        
Investment Owned, at Fair Value $ 6,306 $ 6,306 $ 6,306 $ 6,323        
Fair Value As A Percentage of Member's Equity   18.60%   18.30%        
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Kelso Industries L L C [Member]   Kelso Industries L L C [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.07% 10.07% 10.07% 10.09% 10.07% 10.09%    
Investment, Acquisition Date   Dec. 26, 2024   Dec. 26, 2024        
Investment Maturity Date Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029    
Investment Owned, at Fair Value $ (11) $ (11) $ (11)          
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Kelso Industries L L C [Member]   Kelso Industries L L C [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.07% 10.07% 10.07% 10.09% 10.07% 10.09%    
Investment, Acquisition Date   Dec. 26, 2024   Dec. 26, 2024        
Investment Maturity Date Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029 Dec. 31, 2029    
Investment Owned, Balance, Principal Amount $ 3,981 $ 3,981 $ 3,981 $ 3,611        
Investment Owned, at Cost 3,910 3,910 3,910 3,539        
Investment Owned, at Fair Value $ 3,911 $ 3,911 $ 3,911 $ 3,539        
Percent of net assets 1.40% 1.40% 1.40% 1.20% 1.40% 1.20%    
Investment, Identifier [Axis]: Keras Holdings, LLC Shares                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:KerasHoldingsLLCMember   whfcl:KerasHoldingsLLCMember        
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Acquisition Date   Dec. 31, 2020   Dec. 31, 2020        
Investment Owned, Balance, Shares | shares 496,000 496,000 496,000 496 496,000 496    
Investment Owned, at Cost $ 496 $ 496 $ 496 $ 496        
Investment Owned, at Fair Value $ 782 $ 782 $ 782 $ 779        
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%    
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember   whfcl:LINCSystemsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment Interest Rate 12.96% 12.96% 12.96% 12.99% 12.96% 12.99%    
Investment, Acquisition Date   Jun. 22, 2021   Jun. 22, 2021        
Investment Maturity Date Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026    
Investment Owned, at Fair Value $ 3 $ 3 $ 3 $ 3        
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember   whfcl:LINCSystemsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment Interest Rate 12.96% 12.96% 12.96% 12.99% 12.96% 12.99%    
Investment, Acquisition Date   Jun. 22, 2021   Jun. 22, 2021        
Investment Maturity Date Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026 Feb. 24, 2026    
Investment Owned, Balance, Principal Amount $ 8,091 $ 8,091 $ 8,091 $ 8,155        
Investment Owned, at Cost 8,059 8,059 8,059 8,114        
Investment Owned, at Fair Value $ 8,091 $ 8,091 $ 8,091 $ 8,155        
Fair Value As A Percentage of Member's Equity   23.90%   23.70%        
Investment, Identifier [Axis]: LSCS Holdings, Inc. Second Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:LSCSHoldingsIncMember        
Investment, Type [Extensible Enumeration]       whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Life Sciences Tools And Services [Member]   Life Sciences Tools And Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       0.50%   0.50%    
Spread Above Index       8.00%   8.00%    
Investment Interest Rate       12.47%   12.47%    
Investment, Acquisition Date       Nov. 23, 2021        
Investment Maturity Date       Dec. 16, 2029   Dec. 16, 2029    
Investment Owned, Balance, Principal Amount       $ 5,000        
Investment Owned, at Cost       4,953        
Investment Owned, at Fair Value       $ 5,000        
Percent of net assets       1.70%   1.70%    
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%    
Investment, Acquisition Date   Oct. 16, 2019   Oct. 16, 2019        
Investment Maturity Date Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025    
Investment Owned, Balance, Principal Amount $ 5,006 $ 5,006 $ 5,006 $ 5,020        
Investment Owned, at Cost 5,006 5,006 5,006 5,020        
Investment Owned, at Fair Value $ 5,006 $ 5,006 $ 5,006 $ 5,020        
Percent of net assets 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%    
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%    
Investment, Acquisition Date   Sep. 17, 2024   Sep. 17, 2024        
Investment Maturity Date Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025    
Investment Owned, Balance, Principal Amount $ 437 $ 437 $ 437 $ 437        
Investment Owned, at Cost 437 437 437 437        
Investment Owned, at Fair Value $ 437 $ 437 $ 437 $ 437        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LabLogisticsLLCMember   whfcl:LabLogisticsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%    
Investment, Acquisition Date   Oct. 16, 2019   Oct. 16, 2019        
Investment Maturity Date Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025 Dec. 31, 2025    
Investment Owned, Balance, Principal Amount $ 5,370 $ 5,370 $ 5,370 $ 5,383        
Investment Owned, at Cost 5,368 5,368 5,368 5,381        
Investment Owned, at Fair Value $ 5,370 $ 5,370 $ 5,370 $ 5,383        
Percent of net assets 1.90% 1.90% 1.90% 1.90% 1.90% 1.90%    
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LeviathanIntermediateHoldcoLlcMember   whfcl:LeviathanIntermediateHoldcoLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Spread Above Index 6.00% 6.00% 6.00% 7.50% 6.00% 7.50%    
Investment Interest Rate 10.32% 10.32% 10.32% 11.98% 10.32% 11.98%    
Investment, Acquisition Date   Dec. 27, 2022   Dec. 27, 2022        
Investment Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027    
Investment Owned, Balance, Principal Amount $ 152 $ 152 $ 152          
Investment Owned, at Cost 150 150 150          
Investment Owned, at Fair Value $ 149 $ 149 $ 149 $ 10        
Percent of net assets 0.10% 0.10% 0.10%   0.10%      
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LeviathanIntermediateHoldcoLlcMember   whfcl:LeviathanIntermediateHoldcoLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Spread Above Index 6.00% 6.00% 6.00% 7.50% 6.00% 7.50%    
Investment Interest Rate 10.30% 10.30% 10.30% 11.98% 10.30% 11.98%    
Investment, Acquisition Date   Dec. 27, 2022   Dec. 27, 2022        
Investment Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027    
Investment Owned, Balance, Principal Amount $ 13,751 $ 13,751 $ 13,751 $ 13,211        
Investment Owned, at Cost 13,530 13,530 13,530 12,981        
Investment Owned, at Fair Value $ 13,523 $ 13,523 $ 13,523 $ 13,312        
Percent of net assets 4.80% 4.80% 4.80% 4.60% 4.80% 4.60%    
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LiftBrandsIncMember   whfcl:LiftBrandsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment Interest Rate 11.92% 11.92% 11.92% 11.96% 11.92% 11.96%    
Investment, Acquisition Date   Jun. 29, 2020   Jun. 29, 2020        
Investment Maturity Date Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025    
Investment Owned, Balance, Principal Amount $ 5,447 $ 5,447 $ 5,447 $ 5,461        
Investment Owned, at Cost 5,443 5,443 5,443 5,453        
Investment Owned, at Fair Value $ 5,447 $ 5,447 $ 5,447 $ 5,461        
Percent of net assets 1.90% 1.90% 1.90% 1.90% 1.90% 1.90%    
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LiftBrandsIncMember   whfcl:LiftBrandsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Spread Above Index 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%    
Investment, Acquisition Date   Jun. 29, 2020   Jun. 29, 2020        
Investment Maturity Date Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025    
Investment Owned, Balance, Principal Amount $ 1,632 $ 1,632 $ 1,632 $ 1,594        
Investment Owned, at Cost 1,631 1,631 1,631 1,592        
Investment Owned, at Fair Value $ 1,632 $ 1,632 $ 1,632 $ 1,594        
Investment, Interest Rate, Paid in Kind 9.50% 9.50% 9.50%   9.50%      
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%    
Investment, Identifier [Axis]: LogicMonitor, Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       LogicMonitor, Inc. [Member]        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Systems Software   Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       0.75%   0.75%    
Spread Above Index       5.50%   5.50%    
Investment Interest Rate       9.99%   9.99%    
Investment, Acquisition Date       Nov. 19, 2024        
Investment Maturity Date       Nov. 19, 2031   Nov. 19, 2031    
Investment Owned, Balance, Principal Amount       $ 6,220        
Investment Owned, at Cost       6,144        
Investment Owned, at Fair Value       $ 6,144        
Percent of net assets       2.10%   2.10%    
Investment, Identifier [Axis]: LogicMonitor, Inc. - First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   LogicMonitor, Inc. [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software   Systems Software      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%   0.75%      
Spread Above Index 5.50% 5.50% 5.50%   5.50%      
Investment Interest Rate 9.79% 9.79% 9.79%   9.79%      
Investment, Acquisition Date   Nov. 19, 2024            
Investment Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031   Nov. 19, 2031      
Investment Owned, Balance, Principal Amount $ 6,220 $ 6,220 $ 6,220          
Investment Owned, at Cost 6,147 6,147 6,147          
Investment Owned, at Fair Value $ 6,154 $ 6,154 $ 6,154          
Percent of net assets 2.20% 2.20% 2.20%   2.20%      
Investment, Identifier [Axis]: LogicMonitor, Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       LogicMonitor, Inc. [Member]        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Systems Software   Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       0.75%   0.75%    
Spread Above Index       5.50%   5.50%    
Investment Interest Rate       9.99%   9.99%    
Investment, Acquisition Date       Nov. 19, 2024        
Investment Maturity Date       Nov. 19, 2031   Nov. 19, 2031    
Investment, Identifier [Axis]: LogicMonitor, Inc.- First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   LogicMonitor, Inc. [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software   Systems Software      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 0.75% 0.75% 0.75%   0.75%      
Spread Above Index 5.50% 5.50% 5.50%   5.50%      
Investment Interest Rate 9.79% 9.79% 9.79%   9.79%      
Investment, Acquisition Date   Nov. 19, 2024            
Investment Maturity Date Nov. 19, 2031 Nov. 19, 2031 Nov. 19, 2031   Nov. 19, 2031      
Investment Owned, at Fair Value $ 1 $ 1 $ 1          
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:LuxuryBrandHoldingsIncMember   whfcl:LuxuryBrandHoldingsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.75% 5.50% 5.75%    
Investment Interest Rate 9.82% 9.82% 9.82% 10.11% 9.82% 10.11%    
Investment, Acquisition Date   Dec. 04, 2020   Dec. 04, 2020        
Investment Maturity Date Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026    
Investment Owned, Balance, Principal Amount $ 4,080 $ 4,080 $ 4,080 $ 4,580        
Investment Owned, at Cost 4,063 4,063 4,063 4,556        
Investment Owned, at Fair Value $ 4,080 $ 4,080 $ 4,080 $ 4,580        
Investment, Interest Rate, Paid in Kind       2.00%   2.00%    
Percent of net assets 1.40% 1.40% 1.40% 1.60% 1.40% 1.60%    
Investment, Identifier [Axis]: M2S Group Intermediate Holdings, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:M2sGroupIntermediateHoldingsIncMember   whfcl:M2sGroupIntermediateHoldingsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper Products Paper Products Paper Products Paper Products Paper Products Paper Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member]    
Investment, Interest Rate, Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%    
Spread Above Index 4.75% 4.75% 4.75% 4.73% 4.75% 4.73%    
Investment Interest Rate 9.05% 9.05% 9.05% 9.10% 9.05% 9.10%    
Investment, Acquisition Date   Aug. 22, 2024   Aug. 22, 2024        
Investment Maturity Date Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031 Aug. 25, 2031    
Investment Owned, Balance, Principal Amount $ 9,770 $ 9,770 $ 9,770 $ 9,770        
Investment Owned, at Cost 9,144 9,144 9,144 9,119        
Investment Owned, at Fair Value $ 9,450 $ 9,450 $ 9,450 $ 9,453        
Percent of net assets 3.40% 3.40% 3.40% 3.30% 3.40% 3.30%    
Investment, Identifier [Axis]: MBS Highway, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MbsHighwayLlcMember   whfcl:AlvariaHoldcoMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.50% 8.00% 8.50%    
Investment Interest Rate 12.70% 12.70% 12.70% 13.20% 12.70% 13.20%    
Investment, Acquisition Date   Oct. 13, 2022   Oct. 13, 2022        
Investment Maturity Date Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027    
Investment Owned, Balance, Principal Amount $ 9,271 $ 9,271 $ 9,271 $ 9,286        
Investment Owned, at Cost 9,153 9,153 9,153 9,157        
Investment Owned, at Fair Value $ 9,227 $ 9,227 $ 9,227 $ 9,212        
Investment, Interest Rate, Paid in Kind       0.50%   0.50%    
Investment, Interest Rate, Paid in Cash       12.70%   12.70%    
Percent of net assets 3.30% 3.30% 3.30% 3.20% 3.30% 3.20%    
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.97% 5.97% 5.97% 5.97% 5.97% 5.97%    
Investment Interest Rate 10.39% 10.39% 10.39% 10.51% 10.39% 10.51%    
Investment, Acquisition Date   May 10, 2023   May 10, 2023        
Investment Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029    
Investment Owned, Balance, Principal Amount $ 1,332 $ 1,332 $ 1,332 $ 821        
Investment Owned, at Cost 1,305 1,305 1,305 804        
Investment Owned, at Fair Value $ 1,325 $ 1,325 $ 1,325 $ 817        
Fair Value As A Percentage of Member's Equity   3.90%   2.40%        
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 13.00% 13.00% 13.00% 13.00% 13.00% 13.00%    
Investment, Acquisition Date   May 10, 2023   May 10, 2023        
Investment Maturity Date Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028    
Investment Owned, Balance, Principal Amount $ 241 $ 241 $ 241 $ 241        
Investment Owned, at Cost 236 236 236 236        
Investment Owned, at Fair Value $ 248 $ 248 $ 248 $ 249        
Fair Value As A Percentage of Member's Equity   0.70%   0.70%        
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MgtMergerTargetLlcMember   whfcl:MgtMergerTargetLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.39% 6.39% 6.39% 6.39% 6.39% 6.39%    
Investment Interest Rate 10.81% 10.81% 10.81% 10.85% 10.81% 10.85%    
Investment, Acquisition Date   May 10, 2023   May 10, 2023        
Investment Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029    
Investment Owned, Balance, Principal Amount $ 7,169 $ 7,169 $ 7,169 $ 7,187        
Investment Owned, at Cost 7,030 7,030 7,030 7,040        
Investment Owned, at Fair Value $ 7,162 $ 7,162 $ 7,162 $ 7,176        
Fair Value As A Percentage of Member's Equity   21.10%   20.70%        
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember   whfcl:MSIInformationServicesIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.82% 8.82% 8.82% 8.82% 8.82% 8.82%    
Investment, Acquisition Date   Apr. 25, 2022   Apr. 25, 2022        
Investment Maturity Date Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026    
Investment Owned, Balance, Principal Amount $ 1,050 $ 1,050 $ 1,050 $ 1,050        
Investment Owned, at Cost 1,044 1,044 1,044 1,043        
Investment Owned, at Fair Value $ 870 $ 870 $ 870 $ 945        
Investment, Interest Rate, Paid in Kind 16.10% 16.10% 16.10% 16.11% 16.10% 16.11%    
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%    
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember   whfcl:MSIInformationServicesIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member] Education Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 9.75% 9.75% 9.75% 9.75% 9.75% 9.75%    
Investment, Acquisition Date   Apr. 25, 2022   Apr. 25, 2022        
Investment Maturity Date Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026 Apr. 24, 2026    
Investment Owned, Balance, Principal Amount $ 9,099 $ 9,099 $ 9,099 $ 8,746        
Investment Owned, at Cost 8,558 8,558 8,558 8,552        
Investment Owned, at Fair Value $ 7,539 $ 7,539 $ 7,539 $ 7,871        
Investment, Interest Rate, Paid in Kind 14.20% 14.20% 14.20% 14.23% 14.20% 14.23%    
Percent of net assets 2.70% 2.70% 2.70% 2.80% 2.70% 2.80%    
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   M&M OpCo. LLC (d/b/a Escalent, Inc.)   M&M OpCo. LLC (d/b/a Escalent, Inc.)        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.40% 12.40% 12.40% 12.43% 12.40% 12.43%    
Investment, Acquisition Date   Apr. 07, 2023   Apr. 07, 2023        
Investment Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029    
Investment Owned, at Fair Value $ 5 $ 5 $ 5 $ 5        
Investment, Identifier [Axis]: Mamp;M OpCo. LLC (d/b/a Escalent, Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   M&M OpCo. LLC (d/b/a Escalent, Inc.)   M&M OpCo. LLC (d/b/a Escalent, Inc.)        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.40% 12.40% 12.40% 12.43% 12.40% 12.43%    
Investment, Acquisition Date   Apr. 07, 2023   Apr. 07, 2023        
Investment Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029    
Investment Owned, Balance, Principal Amount $ 4,914 $ 4,914 $ 4,914 $ 4,927        
Investment Owned, at Cost 4,815 4,815 4,815 4,823        
Investment Owned, at Fair Value $ 4,912 $ 4,912 $ 4,912 $ 4,922        
Percent of net assets 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%    
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MarlinDTC-LSMidco2LLCMember   whfcl:MarlinDTC-LSMidco2LLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 11.03% 11.03% 11.03% 11.03% 11.03% 11.03%    
Investment, Acquisition Date   Jul. 19, 2019   Jul. 19, 2019        
Investment Maturity Date Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025    
Investment Owned, at Fair Value $ (38) $ (38) $ (38) $ (38)        
Fair Value As A Percentage of Member's Equity   (0.10%)   (0.10%)        
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MarlinDTC-LSMidco2LLCMember   whfcl:MarlinDTC-LSMidco2LLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 11.03% 11.03% 11.03% 11.03% 11.03% 11.03%    
Investment, Acquisition Date   Jul. 19, 2019   Jul. 19, 2019        
Investment Maturity Date Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025    
Investment Owned, Balance, Principal Amount $ 18,613 $ 18,613 $ 18,613 $ 18,613        
Investment Owned, at Cost 18,595 18,595 18,595 18,577        
Investment Owned, at Fair Value $ 17,869 $ 17,869 $ 17,869 $ 17,865        
Fair Value As A Percentage of Member's Equity   52.70%   51.60%        
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember        
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials    
Investment, Acquisition Date   Sep. 29, 2022   Sep. 29, 2022        
Investment Owned, Balance, Shares | shares 4,000 4,000 4,000 4 4,000 4    
Investment Owned, at Cost $ 400 $ 400 $ 400 $ 400        
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.10% 8.10% 8.10% 8.10% 8.10% 8.10%    
Investment Interest Rate 12.54% 12.54% 12.54% 12.56% 12.54% 12.56%    
Investment, Acquisition Date   Oct. 07, 2022   Oct. 07, 2022        
Investment Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028    
Investment Owned, Balance, Principal Amount $ 413 $ 413 $ 413 $ 414        
Investment Owned, at Cost 410 410 410 411        
Investment Owned, at Fair Value $ 403 $ 403 $ 403 $ 402        
Fair Value As A Percentage of Member's Equity   1.20%   1.20%        
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.10% 8.10% 8.10% 8.10% 8.10% 8.10%    
Investment Interest Rate 12.54% 12.54% 12.54% 12.56% 12.54% 12.56%    
Investment, Acquisition Date   Oct. 07, 2022   Oct. 07, 2022        
Investment Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028    
Investment Owned, at Fair Value $ (2) $ (2) $ (2) $ (3)        
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember   whfcl:MaxSolutionsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.11% 8.11% 8.11% 8.11% 8.11% 8.11%    
Investment Interest Rate 12.56% 12.56% 12.56% 12.57% 12.56% 12.57%    
Investment, Acquisition Date   Oct. 07, 2022   Oct. 07, 2022        
Investment Maturity Date Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028 Sep. 29, 2028    
Investment Owned, Balance, Principal Amount $ 6,504 $ 6,504 $ 6,504 $ 6,521        
Investment Owned, at Cost 6,428 6,428 6,428 6,439        
Investment Owned, at Fair Value $ 6,344 $ 6,344 $ 6,344 $ 6,324        
Fair Value As A Percentage of Member's Equity   18.70%   18.30%        
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.42% 10.42% 10.42% 10.46% 10.42% 10.46%    
Investment, Acquisition Date   Dec. 27, 2024   Dec. 27, 2024        
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029    
Investment Owned, Balance, Principal Amount $ 945 $ 945 $ 945 $ 947        
Investment Owned, at Cost 936 936 936 938        
Investment Owned, at Fair Value $ 946 $ 946 $ 946 $ 938        
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%    
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services us-gaap:HealthcareSectorMember Health Care Services us-gaap:HealthcareSectorMember    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.42% 10.42% 10.42% 10.46% 10.42% 10.46%    
Investment, Acquisition Date   Apr. 11, 2023   Apr. 11, 2023        
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029    
Investment Owned, Balance, Principal Amount $ 4,989 $ 4,989 $ 4,989 $ 5,002        
Investment Owned, at Cost 4,891 4,891 4,891 4,898        
Investment Owned, at Fair Value $ 5,039 $ 5,039 $ 5,039 $ 4,986        
Fair Value As A Percentage of Member's Equity   14.80%   14.40%        
Investment, Identifier [Axis]: Maxor Acquisition, Inc.First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxorAcquisitionInc.Member   whfcl:MaxorAcquisitionInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services us-gaap:HealthcareSectorMember Health Care Services us-gaap:HealthcareSectorMember    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.42% 10.42% 10.42% 10.46% 10.42% 10.46%    
Investment, Acquisition Date   Apr. 11, 2023   Apr. 11, 2023        
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029    
Investment Owned, at Fair Value $ 10 $ 10 $ 10 $ 9        
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:MedicalDeviceIncMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Health Care Supplies   Health Care Supplies    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor       1.25%   1.25%    
Spread Above Index       6.25%   6.25%    
Investment Interest Rate       10.68%   10.68%    
Investment, Acquisition Date       Jul. 27, 2023        
Investment Maturity Date       Jul. 11, 2029   Jul. 11, 2029    
Investment Owned, at Fair Value       $ 6        
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:MedicalDeviceIncMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Health Care Supplies   Health Care Supplies    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor       1.25%   1.25%    
Spread Above Index       6.25%   6.25%    
Investment Interest Rate       10.68%   10.68%    
Investment, Acquisition Date       Jul. 27, 2023        
Investment Maturity Date       Jul. 11, 2029   Jul. 11, 2029    
Investment Owned, Balance, Principal Amount       $ 2,633        
Investment Owned, at Cost       2,584        
Investment Owned, at Fair Value       $ 2,660        
Fair Value As A Percentage of Member's Equity       7.70%        
Investment, Identifier [Axis]: Merriman Holdings LP (d/b/a Escalent, Inc.) Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MerrimanHoldingsLPMember   whfcl:MerrimanHoldingsLPMember        
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services    
Investment, Acquisition Date   Apr. 07, 2023   Apr. 07, 2023        
Investment Owned, Balance, Shares | shares 327,000 327,000 327,000 327 327,000 327    
Investment Owned, at Cost $ 333 $ 333 $ 333 $ 333        
Investment Owned, at Fair Value $ 346 $ 346 $ 346 $ 368        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.51% 10.51% 10.51% 10.51% 10.51% 10.51%    
Investment, Acquisition Date   Dec. 16, 2021   Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 871 $ 871 $ 871 $ 874        
Investment Owned, at Cost 864 864 864 865        
Investment Owned, at Fair Value $ 871 $ 871 $ 871 $ 874        
Fair Value As A Percentage of Member's Equity   2.60%   2.50%        
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.44% 10.44% 10.44% 10.44% 10.44% 10.44%    
Investment, Acquisition Date   Dec. 16, 2021   Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 1,156 $ 1,156 $ 1,156 $ 1,156        
Investment Owned, at Cost 1,146 1,146 1,146 1,145        
Investment Owned, at Fair Value $ 1,159 $ 1,159 $ 1,159 $ 1,160        
Fair Value As A Percentage of Member's Equity   3.40%   3.40%        
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 8.39% 8.39% 8.39% 8.85% 8.39% 8.85%    
Investment, Acquisition Date   Dec. 16, 2021   Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 12,008 $ 12,008 $ 12,008 $ 12,039        
Investment Owned, at Cost 13,431 13,431 13,431 13,449        
Investment Owned, at Fair Value $ 12,965 $ 12,965 $ 12,965 $ 12,465        
Fair Value As A Percentage of Member's Equity   38.20%   36.00%        
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember   whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals Pharmaceuticals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.42% 10.42% 10.42% 10.48% 10.42% 10.48%    
Investment, Acquisition Date   Dec. 16, 2021   Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027 Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 959 $ 959 $ 959 $ 962        
Investment Owned, at Cost 951 951 951 952        
Investment Owned, at Fair Value $ 959 $ 959 $ 959 $ 962        
Fair Value As A Percentage of Member's Equity   2.80%   2.80%        
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]   Midwest Texas Tea CA, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%    
Investment, Acquisition Date   Dec. 22, 2023   Dec. 22, 2023        
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028    
Investment Owned, Balance, Principal Amount $ 644 $ 644 $ 644 $ 645        
Investment Owned, at Cost 632 632 632 632        
Investment Owned, at Fair Value $ 640 $ 640 $ 640 $ 642        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]   Midwest Texas Tea CA, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 6.92% 7.25% 6.92%    
Investment Interest Rate 11.67% 11.67% 11.67% 12.39% 11.67% 12.39%    
Investment, Acquisition Date   Dec. 22, 2023   Dec. 22, 2023        
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028    
Investment Owned, Balance, Principal Amount $ 229 $ 229 $ 229 $ 326        
Investment Owned, at Cost 224 224 224 319        
Investment Owned, at Fair Value $ 232 $ 232 $ 232 $ 328        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]   Midwest Texas Tea CA, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors Distributors Distributors    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%    
Investment, Acquisition Date   Dec. 22, 2023   Dec. 22, 2023        
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028    
Investment Owned, Balance, Principal Amount $ 9,419 $ 9,419 $ 9,419 $ 9,443        
Investment Owned, at Cost 9,243 9,243 9,243 9,255        
Investment Owned, at Fair Value $ 9,370 $ 9,370 $ 9,370 $ 9,399        
Percent of net assets 3.30% 3.30% 3.30% 3.30% 3.30% 3.30%    
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MonarchCollectiveHoldingsLlcMember   whfcl:MonarchCollectiveHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.05% 11.05% 11.05% 11.16% 11.05% 11.16%    
Investment, Acquisition Date   Jan. 10, 2024   Jan. 10, 2024        
Investment Maturity Date Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029    
Investment Owned, Balance, Principal Amount $ 1,592 $ 1,592 $ 1,592 $ 1,596        
Investment Owned, at Cost 1,570 1,570 1,570 1,572        
Investment Owned, at Fair Value $ 1,570 $ 1,570 $ 1,570 $ 1,582        
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%    
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MonarchCollectiveHoldingsLlcMember   whfcl:MonarchCollectiveHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50% 1.50% 1.50%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.05% 11.05% 11.05% 11.08% 11.05% 11.08%    
Investment, Acquisition Date   Jan. 10, 2024   Jan. 10, 2024        
Investment Maturity Date Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029 Jan. 10, 2029    
Investment Owned, Balance, Principal Amount $ 9,283 $ 9,283 $ 9,283 $ 9,306        
Investment Owned, at Cost 9,107 9,107 9,107 9,119        
Investment Owned, at Fair Value $ 9,156 $ 9,156 $ 9,156 $ 9,223        
Percent of net assets 3.30% 3.30% 3.30% 3.20% 3.30% 3.20%    
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MotivationalCIVLLCMember   whfcl:MotivationalCIVLLCMember        
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Acquisition Date   Jul. 12, 2021   Jul. 12, 2021        
Investment Owned, Balance, Shares | shares 1,250,000 1,250,000 1,250,000 1,250 1,250,000 1,250    
Investment Owned, at Cost $ 1,250 $ 1,250 $ 1,250 $ 1,250        
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MotivationalMarketingLLCMember   whfcl:MotivationalMarketingLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment Interest Rate 12.92% 12.92% 12.92% 13.00% 12.92% 13.00%    
Investment, Acquisition Date   Jul. 12, 2021   Jul. 12, 2021        
Investment Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026    
Investment Owned, Balance, Principal Amount $ 1,182 $ 1,182 $ 1,182 $ 1,182        
Investment Owned, at Cost 1,176 1,176 1,176 1,175        
Investment Owned, at Fair Value $ 1,099 $ 1,099 $ 1,099 $ 1,061        
Investment, Interest Rate, Paid in Kind 7.46% 7.46% 7.46% 2.00% 7.46% 2.00%    
Investment, Interest Rate, Paid in Cash 5.46% 5.46% 5.46% 11.00% 5.46% 11.00%    
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%    
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:MotivationalMarketingLLCMember   whfcl:MotivationalMarketingLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.50% 8.50% 8.50% 8.50% 8.50% 8.50%    
Investment Interest Rate 12.92% 12.92% 12.92% 12.96% 12.92% 12.96%    
Investment, Acquisition Date   Jul. 12, 2021   Jul. 12, 2021        
Investment Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026    
Investment Owned, Balance, Principal Amount $ 10,721 $ 10,721 $ 10,721 $ 10,510        
Investment Owned, at Cost 10,670 10,670 10,670 10,449        
Investment Owned, at Fair Value $ 9,972 $ 9,972 $ 9,972 $ 9,438        
Investment, Interest Rate, Paid in Kind 7.46% 7.46% 7.46% 7.48% 7.46% 7.48%    
Investment, Interest Rate, Paid in Cash 5.46% 5.46% 5.46% 5.48% 5.46% 5.48%    
Percent of net assets 3.40% 3.40% 3.40% 3.20% 3.40% 3.20%    
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:NNAServicesLLCMember   whfcl:NNAServicesLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.70% 11.70% 11.70% 11.73% 11.70% 11.73%    
Investment, Acquisition Date   Aug. 27, 2021   Aug. 27, 2021        
Investment Maturity Date Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026    
Investment Owned, Balance, Principal Amount $ 8,292 $ 8,292 $ 8,292 $ 9,125        
Investment Owned, at Cost 8,263 8,263 8,263 9,087        
Investment Owned, at Fair Value $ 8,152 $ 8,152 $ 8,152 $ 8,941        
Percent of net assets 2.90% 2.90% 2.90% 3.10% 2.90% 3.10%    
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:NPAVLessorCorp.Member   whfcl:HRGManagementLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Mar. 01, 2022   Mar. 01, 2022        
Investment Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027    
Investment Owned, Balance, Principal Amount $ 725 $ 725 $ 725 $ 725        
Investment Owned, at Cost 720 720 720 719        
Investment Owned, at Fair Value $ 660 $ 660 $ 660 $ 660        
Fair Value As A Percentage of Member's Equity   1.90%   1.90%        
Investment, Identifier [Axis]: NPAV Lessor Corp. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:NPAVLessorCorp.Member   whfcl:HRGManagementLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services Real Estate Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Mar. 01, 2022   Mar. 01, 2022        
Investment Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027    
Investment Owned, Balance, Principal Amount $ 6,454 $ 6,454 $ 6,454 $ 6,502        
Investment Owned, at Cost 6,407 6,407 6,407 6,448        
Investment Owned, at Fair Value $ 5,876 $ 5,876 $ 5,876 $ 5,918        
Fair Value As A Percentage of Member's Equity   17.30%   17.10%        
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:NavigaIncMember   whfcl:NavigaIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.84% 6.84% 6.84% 6.84% 6.84% 6.84%    
Investment Interest Rate 12.78% 12.78% 12.78% 12.78% 12.78% 12.78%    
Investment, Acquisition Date   Jun. 14, 2019   Jun. 14, 2019        
Investment Maturity Date Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024    
Investment Owned, Balance, Principal Amount $ 301 $ 301 $ 301 $ 301        
Investment Owned, at Cost 301 301 301 301        
Investment Owned, at Fair Value $ 161 $ 161 $ 161 $ 169        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:NavigaIncMember   whfcl:NavigaIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%    
Investment Interest Rate 12.40% 12.40% 12.40% 12.40% 12.40% 12.40%    
Investment, Acquisition Date   Jun. 14, 2019   Jun. 14, 2019        
Investment Maturity Date Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024 Jun. 28, 2024    
Investment Owned, Balance, Principal Amount $ 3,140 $ 3,140 $ 3,140 $ 3,140        
Investment Owned, at Cost 3,140 3,140 3,140 3,140        
Investment Owned, at Fair Value $ 1,683 $ 1,683 $ 1,683 $ 1,763        
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%    
Investment, Identifier [Axis]: New American Crafts Holdings, LLC Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:NewAmericanCraftsHoldingsLlcMember   whfcl:NewAmericanCraftsHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Acquisition Date   Mar. 16, 2023   Mar. 16, 2023        
Investment Owned, Balance, Shares | shares 1,000 1,000 1,000 1 1,000 1    
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.42% 5.42% 5.42% 5.75% 5.42% 5.75%    
Investment Interest Rate 10.79% 10.79% 10.79% 10.15% 10.79% 10.15%    
Investment, Acquisition Date   Jun. 14, 2024   Jun. 14, 2024        
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029    
Investment Owned, Balance, Principal Amount $ 91 $ 91 $ 91 $ 30        
Investment Owned, at Cost 90 90 90 30        
Investment Owned, at Fair Value $ 97 $ 97 $ 97 $ 36        
Fair Value As A Percentage of Member's Equity   0.30%   0.10%        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] whfcl:SecuredOvernightFinancingRateMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.42% 5.42% 5.42% 5.75% 5.42% 5.75%    
Investment Interest Rate 10.79% 10.79% 10.79% 10.15% 10.79% 10.15%    
Investment, Acquisition Date   May 14, 2024   May 14, 2024        
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029    
Investment Owned, Balance, Principal Amount $ 82 $ 82 $ 82 $ 27        
Investment Owned, at Cost 81 81 81 27        
Investment Owned, at Fair Value $ 87 $ 87 $ 87 $ 33        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.07% 10.07% 10.07% 10.13% 10.07% 10.13%    
Investment, Acquisition Date   Jun. 14, 2024   Jun. 14, 2024        
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029    
Investment Owned, Balance, Principal Amount $ 4,509 $ 4,509 $ 4,509 $ 4,520        
Investment Owned, at Cost 4,434 4,434 4,434 4,441        
Investment Owned, at Fair Value $ 4,502 $ 4,502 $ 4,502 $ 4,505        
Fair Value As A Percentage of Member's Equity   13.30%   13.00%        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Panos Brands, Llc [Member]   Panos Brands, Llc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.07% 10.07% 10.07% 10.13% 10.07% 10.13%    
Investment, Acquisition Date   May 14, 2024   May 14, 2024        
Investment Maturity Date May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029 May 14, 2029    
Investment Owned, Balance, Principal Amount $ 4,058 $ 4,058 $ 4,058 $ 4,068        
Investment Owned, at Cost 3,991 3,991 3,991 3,997        
Investment Owned, at Fair Value $ 4,051 $ 4,051 $ 4,051 $ 4,054        
Percent of net assets 1.40% 1.40% 1.40% 1.40% 1.40% 1.40%    
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PFBHoldcoIncMember   whfcl:PfbHoldingCompanyLlcMember        
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products Building Products Building Products    
Investment, Acquisition Date   Dec. 17, 2021   Dec. 17, 2021        
Investment Owned, Balance, Shares | shares 1,000 1,000 1,000 1 1,000 1    
Investment Owned, at Cost $ 24 $ 24 $ 24 $ 24        
Investment, Identifier [Axis]: PLTFRM Companies, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:PltfrmCompaniesLlcMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Advertising   Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       3.00%   3.00%    
Spread Above Index       9.00%   9.00%    
Investment Interest Rate       13.34%   13.34%    
Investment, Acquisition Date       Jan. 29, 2024        
Investment Maturity Date       Jan. 29, 2029   Jan. 29, 2029    
Investment Owned, Balance, Principal Amount       $ 889        
Investment Owned, at Cost       867        
Investment Owned, at Fair Value       $ 916        
Investment, Interest Rate, Paid in Kind       1.00%   1.00%    
Investment, Interest Rate, Paid in Cash       12.34%   12.34%    
Percent of net assets       0.30%   0.30%    
Investment, Identifier [Axis]: PLTFRM Companies, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:PltfrmCompaniesLlcMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Advertising   Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       whfcl:SecuredOvernightFinancingRateMember   whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor       3.00%   3.00%    
Spread Above Index       9.00%   9.00%    
Investment Interest Rate       13.36%   13.36%    
Investment, Acquisition Date       Jan. 29, 2024        
Investment Maturity Date       Jan. 29, 2029   Jan. 29, 2029    
Investment Owned, Balance, Principal Amount       $ 7,950        
Investment Owned, at Cost       7,757        
Investment Owned, at Fair Value       $ 8,188        
Investment, Interest Rate, Paid in Kind       1.00%   1.00%    
Investment, Interest Rate, Paid in Cash       12.36%   12.36%    
Percent of net assets       3.00%   3.00%    
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PatagoniaHoldcoLLCMember   whfcl:PatagoniaHoldcoLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services Integrated Telecommunication Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.05% 10.05% 10.05% 10.27% 10.05% 10.27%    
Investment, Acquisition Date   Aug. 05, 2022   Aug. 05, 2022        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 14,259 $ 14,259 $ 14,259 $ 14,296        
Investment Owned, at Cost 12,661 12,661 12,661 12,602        
Investment Owned, at Fair Value $ 13,104 $ 13,104 $ 13,104 $ 13,135        
Percent of net assets 4.70% 4.70% 4.70% 4.60% 4.70% 4.60%    
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.50% 5.50% 5.50%   5.50%      
Investment Interest Rate 9.95% 9.95% 9.95%   9.95%      
Investment, Acquisition Date   Jan. 28, 2025            
Investment Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029   Feb. 07, 2029      
Investment Owned, Balance, Principal Amount $ 22 $ 22 $ 22          
Investment Owned, at Cost 21 21 21          
Investment Owned, at Fair Value $ 22 $ 22 $ 22          
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]   Pavement Partners Interco, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 6.75% 5.50% 6.75%    
Investment Interest Rate 9.95% 9.95% 9.95% 11.23% 9.95% 11.23%    
Investment, Acquisition Date   Jan. 29, 2025   Mar. 17, 2023        
Investment Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2028 Feb. 07, 2029 Feb. 07, 2028    
Investment Owned, Balance, Principal Amount $ 568 $ 568 $ 568 $ 569        
Investment Owned, at Cost 558 558 558 558        
Investment Owned, at Fair Value $ 568 $ 568 $ 568 $ 569        
Fair Value As A Percentage of Member's Equity   1.70%   1.70%        
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.50% 5.50% 5.50%   5.50%      
Investment Interest Rate 9.95% 9.95% 9.95%   9.95%      
Investment, Acquisition Date   Jan. 28, 2025            
Investment Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029   Feb. 07, 2029      
Investment Owned, Balance, Principal Amount $ 7 $ 7 $ 7          
Investment Owned, at Cost 7 7 7          
Investment Owned, at Fair Value $ 7 $ 7 $ 7          
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]   Pavement Partners Interco, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 6.75% 5.50% 6.75%    
Investment Interest Rate 9.95% 9.95% 9.95% 11.23% 9.95% 11.23%    
Investment, Acquisition Date   Jan. 29, 2025   Mar. 17, 2023        
Investment Maturity Date Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2029 Feb. 07, 2028 Feb. 07, 2029 Feb. 07, 2028    
Investment Owned, Balance, Principal Amount $ 246 $ 246 $ 246 $ 338        
Investment Owned, at Cost 241 241 241 331        
Investment Owned, at Fair Value $ 250 $ 250 $ 250 $ 341        
Fair Value As A Percentage of Member's Equity   0.70%   1.00%        
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering   Construction & Engineering      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.50% 5.50% 5.50%   5.50%      
Investment Interest Rate 9.95% 9.95% 9.95%   9.95%      
Investment, Acquisition Date   Jan. 28, 2025            
Investment Maturity Date Feb. 08, 2029 Feb. 08, 2029 Feb. 08, 2029   Feb. 08, 2029      
Investment Owned, Balance, Principal Amount $ 162 $ 162 $ 162          
Investment Owned, at Cost 161 161 161          
Investment Owned, at Fair Value $ 162 $ 162 $ 162          
Percent of net assets 0.10% 0.10% 0.10%   0.10%      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Pavement Partners Interco, LLC [Member]   Pavement Partners Interco, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 6.75% 5.50% 6.75%    
Investment Interest Rate 9.95% 9.95% 9.95% 11.23% 9.95% 11.23%    
Investment, Acquisition Date   Jan. 28, 2025   Mar. 17, 2023        
Investment Maturity Date Feb. 08, 2029 Feb. 08, 2029 Feb. 08, 2029 Feb. 07, 2028 Feb. 08, 2029 Feb. 07, 2028    
Investment Owned, Balance, Principal Amount $ 5,104 $ 5,104 $ 5,104 $ 5,117        
Investment Owned, at Cost 5,009 5,009 5,009 5,015        
Investment Owned, at Fair Value $ 5,101 $ 5,101 $ 5,101 $ 5,111        
Fair Value As A Percentage of Member's Equity   15.00%   14.80%        
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PirtekHoldcoLLCMember   whfcl:PirtekHoldcoLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 9.95% 9.95% 9.95% 9.95% 9.95% 9.95%    
Investment, Acquisition Date   Oct. 31, 2023   Oct. 31, 2023        
Investment Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028    
Investment Owned, at Fair Value $ 16 $ 16 $ 16 $ 17        
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PirtekHoldcoLLCMember   whfcl:PirtekHoldcoLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 9.95% 9.95% 9.95% 9.95% 9.95% 9.95%    
Investment, Acquisition Date   Oct. 31, 2023   Oct. 31, 2023        
Investment Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028    
Investment Owned, Balance, Principal Amount $ 6,908 $ 6,908 $ 6,908 $ 7,425        
Investment Owned, at Cost 6,796 6,796 6,796 7,298        
Investment Owned, at Fair Value $ 6,973 $ 6,973 $ 6,973 $ 7,425        
Fair Value As A Percentage of Member's Equity   20.50%   21.50%        
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember   whfcl:PlaymonsterGroupEquityIncMember        
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member] Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Leisure Products   Leisure Products    
Investment, Acquisition Date       Jan. 24, 2022        
Investment Owned, Balance, Shares | shares       72   72    
Investment Owned, at Cost       $ 460        
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember            
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember   us-gaap:PreferredStockMember      
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember            
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]   Common Stock [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products   Leisure Products      
Investment, Acquisition Date   Jan. 24, 2022            
Investment Owned, Balance, Shares | shares 72,000 72,000 72,000   72,000      
Investment Owned, at Cost $ 460 $ 460 $ 460          
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupEquityIncMember   whfcl:PlaymonsterGroupEquityIncMember        
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Spread Above Index 14.00% 14.00% 14.00% 14.00% 14.00% 14.00%    
Investment, Acquisition Date   Jan. 24, 2022   Jan. 24, 2022        
Investment Owned, Balance, Shares | shares 36,000 36,000 36,000 36 36,000 36    
Investment Owned, at Cost $ 3,600 $ 3,600 $ 3,600 $ 3,600        
Investment, Identifier [Axis]: Playmonster Group LLC, First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupLLCMember   whfcl:PlaymonsterGroupLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 9.00% 9.00% 9.00% 9.00% 9.00% 9.00%    
Investment, Acquisition Date   Jun. 07, 2021   Jun. 07, 2021        
Investment Maturity Date Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026    
Investment Owned, Balance, Principal Amount $ 5,062 $ 5,062 $ 5,062 $ 4,890        
Investment Owned, at Cost 3,661 3,661 3,661 3,661        
Investment Owned, at Fair Value $ 1,601 $ 1,601 $ 1,601 $ 1,635       1,363
Investment, Interest Rate, Paid in Kind 13.44% 13.44% 13.44% 13.74% 13.44% 13.74%    
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%    
Investment, Identifier [Axis]: Playmonster Group LLC, Priority First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupLLCMember   whfcl:PlaymonsterGroupLLCMember        
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment, Acquisition Date   Dec. 09, 2022   Dec. 09, 2022        
Investment Maturity Date Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026    
Investment Owned, Balance, Principal Amount $ 1,326 $ 1,326 $ 1,326 $ 1,289        
Investment Owned, at Cost 1,315 1,315 1,315 1,275        
Investment Owned, at Fair Value $ 1,206 $ 1,206 $ 1,206 $ 1,172       1,015
Investment, Interest Rate, Paid in Kind 11.21% 11.21% 11.21% 11.41% 11.21% 11.41%    
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%    
Investment, Identifier [Axis]: Power Service Group CR Acquisition Inc First Lien Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PowerServiceGroupCrAcquisitionIncMember   whfcl:PowerServiceGroupCrAcquisitionIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%    
Investment, Acquisition Date   Jul. 11, 2022   Jul. 11, 2022        
Investment Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026    
Investment Owned, Balance, Principal Amount $ 1,283 $ 1,283 $ 1,283 $ 1,340        
Investment Owned, at Cost 1,274 1,274 1,274 1,329        
Investment Owned, at Fair Value $ 1,296 $ 1,296 $ 1,296 $ 1,354        
Percent of net assets 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%    
Investment, Identifier [Axis]: Power Service Group CR Acquisition Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PowerServiceGroupCrAcquisitionIncMember   whfcl:PowerServiceGroupCrAcquisitionIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member] Heavy Electrical Equipment [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.75% 6.75% 6.75% 6.75% 6.75% 6.75%    
Investment Interest Rate 11.20% 11.20% 11.20% 11.23% 11.20% 11.23%    
Investment, Acquisition Date   Jun. 25, 2021   Jun. 25, 2021        
Investment Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026    
Investment Owned, Balance, Principal Amount $ 8,325 $ 8,325 $ 8,325 $ 8,697        
Investment Owned, at Cost 8,281 8,281 8,281 8,642        
Investment Owned, at Fair Value $ 8,408 $ 8,408 $ 8,408 $ 8,784        
Percent of net assets 3.00% 3.00% 3.00% 3.10% 3.00% 3.10%    
Investment, Identifier [Axis]: Pressurized Holdings, LLC Common Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PressurizedHoldingsLlcMember   whfcl:PressurizedHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member]    
Investment, Acquisition Date   Mar. 16, 2023   Mar. 16, 2023        
Investment, Identifier [Axis]: Pressurized Holdings, LLC Preferred Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PressurizedHoldingsLlcMember   whfcl:PressurizedHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member] Diversified Chemicals [Member]    
Spread Above Index 14.00% 14.00% 14.00% 14.00% 14.00% 14.00%    
Investment, Acquisition Date   Mar. 16, 2023   Mar. 16, 2023        
Investment Owned, at Cost $ 4,537 $ 4,537 $ 4,537 $ 4,537        
Investment Owned, at Fair Value $ 2,222 $ 2,222 $ 2,222 $ 1,657       251
Percent of net assets 0.80% 0.80% 0.80% 0.60% 0.80% 0.60%    
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:PrincipalLightingGroupLlcMember        
Investment, Type [Extensible Enumeration]       whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Electrical Components & Equipment   Electrical Components & Equipment    
Investment, Variable Interest Rate, Type [Extensible Enumeration]       Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor       1.00%   1.00%    
Spread Above Index       5.25%   5.25%    
Investment Interest Rate       9.81%   9.81%    
Investment, Acquisition Date       Dec. 03, 2024        
Investment Maturity Date       Nov. 04, 2030   Nov. 04, 2030    
Investment, Identifier [Axis]: Principal Lighting Group, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:PrincipalLightingGroupLlcMember   whfcl:PrincipalLightingGroupLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment Electrical Components & Equipment    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.25% 5.25% 5.25% 5.25% 5.25% 5.25%    
Investment Interest Rate 9.54% 9.54% 9.54% 9.81% 9.54% 9.81%    
Investment, Acquisition Date   Dec. 03, 2024   Dec. 03, 2024        
Investment Maturity Date Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030 Nov. 04, 2030    
Investment Owned, Balance, Principal Amount $ 3,522 $ 3,522 $ 3,522 $ 3,531        
Investment Owned, at Cost 3,472 3,472 3,472 3,479        
Investment Owned, at Fair Value $ 3,472 $ 3,472 $ 3,472 $ 3,479        
Fair Value As A Percentage of Member's Equity   10.20%   10.10%        
Investment, Identifier [Axis]: Quest Events, LLC Common Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonAUnitsMember whfcl:CommonUnitsMember whfcl:CommonAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Acquisition Date   Dec. 28, 2018   Dec. 28, 2018        
Investment Owned, Balance, Shares | shares 333,000 333,000 333,000 333 333,000 333    
Investment Owned, at Cost $ 376 $ 376 $ 376 $ 376        
Investment Owned, at Fair Value $ 154 $ 154 $ 154 $ 149        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services   Diversified Support Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member]   Base Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 6.25% 6.25% 6.25%   6.25%      
Investment, Acquisition Date   Mar. 21, 2025            
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026   Sep. 30, 2026      
Investment Owned, Balance, Principal Amount $ 177 $ 177 $ 177          
Investment Owned, at Cost 173 173 173          
Investment Owned, at Fair Value $ 175 $ 175 $ 175          
Percent of net assets 0.10% 0.10% 0.10%   0.10%      
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Prime Rate [Member] Prime Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Prime Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 2.00% 1.00% 2.00%    
Spread Above Index 6.25% 6.25% 6.25% 7.00% 6.25% 7.00%    
Investment Interest Rate 13.02% 13.02% 13.02% 11.59% 13.02% 11.59%    
Investment, Acquisition Date   Jul. 19, 2019   Jul. 19, 2019        
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026    
Investment Owned, Balance, Principal Amount $ 412 $ 412 $ 412 $ 247        
Investment Owned, at Cost 411 411 411 246        
Investment Owned, at Fair Value $ 406 $ 406 $ 406 $ 248        
Fair Value As A Percentage of Member's Equity   1.20%   0.70%        
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.80% 10.80% 10.80% 10.90% 10.80% 10.90%    
Investment, Acquisition Date   Sep. 13, 2024   Sep. 13, 2024        
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026    
Investment Owned, Balance, Principal Amount $ 1,267 $ 1,267 $ 1,267 $ 480        
Investment Owned, at Cost 1,244 1,244 1,244 472        
Investment Owned, at Fair Value $ 1,244 $ 1,244 $ 1,244 $ 473        
Percent of net assets 0.40% 0.40% 0.40% 0.20% 0.40% 0.20%    
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Quest Events, LLC [Member]   Quest Events, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services Diversified Support Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%    
Spread Above Index 7.00% 7.00% 7.00% 7.00% 7.00% 7.00%    
Investment Interest Rate 11.56% 11.56% 11.56% 11.59% 11.56% 11.59%    
Investment, Acquisition Date   Jul. 19, 2019   Jul. 19, 2019        
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026    
Investment Owned, Balance, Principal Amount $ 11,562 $ 11,562 $ 11,562 $ 11,592        
Investment Owned, at Cost 11,537 11,537 11,537 11,563        
Investment Owned, at Fair Value $ 11,415 $ 11,415 $ 11,415 $ 11,592        
Fair Value As A Percentage of Member's Equity   33.60%   33.50%        
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%    
Investment Interest Rate 9.44% 9.44% 9.44% 9.99% 9.44% 9.99%    
Investment, Acquisition Date   Jan. 27, 2021   Jan. 27, 2021        
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029    
Investment Owned, Balance, Principal Amount $ 2,938 $ 2,938 $ 2,938 $ 2,946        
Investment Owned, at Cost 2,916 2,916 2,916 2,922        
Investment Owned, at Fair Value $ 2,938 $ 2,938 $ 2,938 $ 2,946        
Fair Value As A Percentage of Member's Equity   8.70%   8.50%        
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%    
Investment Interest Rate 9.44% 9.44% 9.44% 9.99% 9.44% 9.99%    
Investment, Acquisition Date   Jan. 27, 2021   Jan. 27, 2021        
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029    
Investment Owned, at Fair Value $ 10 $ 10 $ 10 $ 11        
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:RCKCAcquisitionsLLCMember   whfcl:RCKCAcquisitionsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.00% 5.00% 5.00% 5.25% 5.00% 5.25%    
Investment Interest Rate 9.45% 9.45% 9.45% 9.73% 9.45% 9.73%    
Investment, Acquisition Date   Jan. 27, 2021   Jan. 27, 2021        
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029    
Investment Owned, Balance, Principal Amount $ 10,894 $ 10,894 $ 10,894 $ 10,923        
Investment Owned, at Cost 10,816 10,816 10,816 10,839        
Investment Owned, at Fair Value $ 10,894 $ 10,894 $ 10,894 $ 10,923        
Fair Value As A Percentage of Member's Equity   32.10%   31.60%        
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:RLJPro-VacInc.Member   whfcl:RLJPro-VacInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services Environmental & Facilities Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.71% 10.71% 10.71% 10.71% 10.71% 10.71%    
Investment, Acquisition Date   Jan. 23, 2024   Jan. 23, 2024        
Investment Maturity Date Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026 Dec. 31, 2026    
Investment Owned, Balance, Principal Amount $ 6,642 $ 6,642 $ 6,642 $ 6,659        
Investment Owned, at Cost 6,561 6,561 6,561 6,566        
Investment Owned, at Fair Value $ 6,613 $ 6,613 $ 6,613 $ 6,637        
Fair Value As A Percentage of Member's Equity   19.50%   19.20%        
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Ribbon Communications Operating Company, Inc. [Member]   Ribbon Communications Operating Company, Inc. [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.57% 10.57% 10.57% 10.59% 10.57% 10.59%    
Investment, Acquisition Date   Jun. 21, 2024   Jun. 21, 2024        
Investment Maturity Date Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029    
Investment Owned, at Fair Value $ 14 $ 14 $ 14 $ 9        
Investment, Identifier [Axis]: Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Ribbon Communications Operating Company, Inc. [Member]   Ribbon Communications Operating Company, Inc. [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software Systems Software Systems Software Systems Software Systems Software Systems Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.57% 10.57% 10.57% 10.59% 10.57% 10.59%    
Investment, Acquisition Date   Jun. 21, 2024   Jun. 21, 2024        
Investment Maturity Date Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029 Jun. 21, 2029    
Investment Owned, Balance, Principal Amount $ 8,734 $ 8,734 $ 8,734 $ 8,756        
Investment Owned, at Cost 8,586 8,586 8,586 8,600        
Investment Owned, at Fair Value $ 8,724 $ 8,724 $ 8,724 $ 8,692        
Percent of net assets 3.10% 3.10% 3.10% 3.00% 3.10% 3.00%    
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:Ross-SimonsTopcoLPMember   whfcl:Ross-SimonsTopcoLPMember        
Investment, Type [Extensible Enumeration] whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember whfcl:PreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail Broadline Retail    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment, Acquisition Date   Dec. 04, 2020   Dec. 04, 2020        
Investment Owned, Balance, Shares | shares 600,000 600,000 600,000 600 600,000 600    
Investment Owned, at Cost $ 514 $ 514 $ 514 $ 514        
Investment Owned, at Fair Value $ 776 $ 776 $ 776 $ 756        
Percent of net assets 0.30% 0.30% 0.30% 0.30% 0.30% 0.30%    
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ScicBuyerInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products   Building Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.30% 9.30% 9.30%   9.30%      
Investment, Acquisition Date   Mar. 28, 2025            
Investment Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031   Mar. 28, 2031      
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ScicBuyerInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products   Building Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.30% 9.30% 9.30%   9.30%      
Investment, Acquisition Date   Mar. 28, 2025            
Investment Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031   Mar. 28, 2031      
Investment Owned, Balance, Principal Amount $ 295 $ 295 $ 295          
Investment Owned, at Cost 291 291 291          
Investment Owned, at Fair Value $ 291 $ 291 $ 291          
Percent of net assets 0.10% 0.10% 0.10%   0.10%      
Investment, Identifier [Axis]: SCIC Buyer, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ScicBuyerInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products   Building Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.30% 9.30% 9.30%   9.30%      
Investment, Acquisition Date   Mar. 28, 2025            
Investment Maturity Date Mar. 28, 2031 Mar. 28, 2031 Mar. 28, 2031   Mar. 28, 2031      
Investment Owned, Balance, Principal Amount $ 9,159 $ 9,159 $ 9,159          
Investment Owned, at Cost 9,022 9,022 9,022          
Investment Owned, at Fair Value $ 9,022 $ 9,022 $ 9,022          
Percent of net assets 3.20% 3.20% 3.20%   3.20%      
Investment, Identifier [Axis]: Salon Republic Holdings, LLC Common Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:SalonRepublicInvestmentsLlcMember        
Investment, Type [Extensible Enumeration]       Common Stock [Member]   Common Stock [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Specialized Consumer Services [Member]   Specialized Consumer Services [Member]    
Investment, Acquisition Date       Dec. 02, 2022        
Investment Owned, Balance, Shares | shares       400   400    
Investment Owned, at Cost       $ 400        
Investment Owned, at Fair Value       $ 132        
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%    
Investment, Acquisition Date   Dec. 02, 2022   Dec. 02, 2022        
Investment Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027    
Investment Owned, Balance, Principal Amount $ 1,664 $ 1,664 $ 1,664 $ 1,669        
Investment Owned, at Cost 1,641 1,641 1,641 1,641        
Investment Owned, at Fair Value $ 1,666 $ 1,666 $ 1,666 $ 1,672        
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%    
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%    
Investment, Acquisition Date   Dec. 02, 2022   Dec. 02, 2022        
Investment Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027    
Investment Owned, at Fair Value $ 11 $ 11 $ 11 $ 13        
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember   whfcl:SalonRepublicHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 8.00% 8.00% 8.00% 8.00% 8.00% 8.00%    
Investment Interest Rate 12.42% 12.42% 12.42% 12.46% 12.42% 12.46%    
Investment, Acquisition Date   Dec. 02, 2022   Dec. 02, 2022        
Investment Maturity Date Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027 Dec. 02, 2027    
Investment Owned, Balance, Principal Amount $ 5,065 $ 5,065 $ 5,065 $ 5,076        
Investment Owned, at Cost 4,984 4,984 4,984 4,988        
Investment Owned, at Fair Value $ 5,050 $ 5,050 $ 5,050 $ 5,063        
Percent of net assets 1.80% 1.80% 1.80% 1.80% 1.80% 1.80%    
Investment, Identifier [Axis]: Salon Republic Holdings, LLC, Preferred Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]       whfcl:SalonRepublicInvestmentsLlcMember        
Investment, Type [Extensible Enumeration]       us-gaap:PreferredStockMember   us-gaap:PreferredStockMember    
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Specialized Consumer Services [Member]   Specialized Consumer Services [Member]    
Spread Above Index       8.00%   8.00%    
Investment, Acquisition Date       Dec. 02, 2022        
Investment Owned, Balance, Shares | shares       200   200    
Investment Owned, at Cost       $ 200        
Investment Owned, at Fair Value       $ 242        
Percent of net assets       0.10%   0.10%    
Investment, Identifier [Axis]: Salon Republic Investments LLC Common Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicInvestmentsLlcMember            
Investment, Type [Extensible Enumeration] Common Stock [Member] Common Stock [Member] Common Stock [Member]   Common Stock [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]   Specialized Consumer Services [Member]      
Investment, Acquisition Date   Dec. 02, 2022            
Investment Owned, Balance, Shares | shares 400,000 400,000 400,000   400,000      
Investment Owned, at Cost $ 400 $ 400 $ 400          
Investment Owned, at Fair Value $ 62 $ 62 $ 62          
Investment, Identifier [Axis]: Salon Republic Investments LLC Preferred Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicInvestmentsLlcMember            
Investment, Type [Extensible Enumeration] us-gaap:PreferredStockMember us-gaap:PreferredStockMember us-gaap:PreferredStockMember   us-gaap:PreferredStockMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member] Specialized Consumer Services [Member] Specialized Consumer Services [Member]   Specialized Consumer Services [Member]      
Spread Above Index 8.00% 8.00% 8.00%   8.00%      
Investment, Acquisition Date   Dec. 02, 2022            
Investment Owned, Balance, Shares | shares 200,000 200,000 200,000   200,000      
Investment Owned, at Cost $ 200 $ 200 $ 200          
Investment Owned, at Fair Value $ 247 $ 247 $ 247          
Percent of net assets 0.10% 0.10% 0.10%   0.10%      
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SleepOpCoLLCMember   whfcl:SleepOpCoLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.95% 10.95% 10.95% 11.28% 10.95% 11.28%    
Investment, Acquisition Date   Oct. 12, 2021   Oct. 12, 2021        
Investment Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026    
Investment Owned, at Fair Value $ 2 $ 2 $ 2 $ 5        
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SleepOpCoLLCMember   whfcl:SleepOpCoLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.95% 10.95% 10.95% 11.28% 10.95% 11.28%    
Investment, Acquisition Date   Oct. 12, 2021   Oct. 12, 2021        
Investment Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026    
Investment Owned, Balance, Principal Amount $ 22,445 $ 22,445 $ 22,445 $ 22,590        
Investment Owned, at Cost 22,283 22,283 22,283 22,401        
Investment Owned, at Fair Value $ 22,309 $ 22,309 $ 22,309 $ 22,441        
Percent of net assets 7.90% 7.90% 7.90% 7.80% 7.90% 7.80%    
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member   whfcl:SmaltoInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.20% 10.20% 10.20% 10.21% 10.20% 10.21%    
Investment, Acquisition Date   May 04, 2022   May 04, 2022        
Investment Maturity Date Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028    
Investment Owned, Balance, Principal Amount $ 978 $ 978 $ 978 $ 978        
Investment Owned, at Cost 968 968 968 967        
Investment Owned, at Fair Value $ 978 $ 978 $ 978 $ 978        
Fair Value As A Percentage of Member's Equity   2.90%   2.80%        
Investment, Identifier [Axis]: Smalto Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member   whfcl:SmaltoInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember whfcl:EuroInterbankOfferedRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 8.36% 8.36% 8.36% 8.86% 8.36% 8.86%    
Investment, Acquisition Date   May 04, 2022   May 04, 2022        
Investment Maturity Date Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028 Apr. 28, 2028    
Investment Owned, Balance, Principal Amount $ 6,423 $ 6,423 $ 6,423 $ 6,423        
Investment Owned, at Cost 6,691 6,691 6,691 6,682        
Investment Owned, at Fair Value $ 6,947 $ 6,947 $ 6,947 $ 6,654        
Fair Value As A Percentage of Member's Equity   20.50%   19.20%        
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember        
Investment, Type [Extensible Enumeration] us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember us-gaap:CommonClassAMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Investment, Acquisition Date   Jun. 29, 2020   Jun. 29, 2020        
Investment Owned, Balance, Shares | shares 2,000 2,000 2,000 2 2,000 2    
Investment Owned, at Cost $ 1,941 $ 1,941 $ 1,941 $ 1,941        
Investment Owned, at Fair Value $ 282 $ 282 $ 282 $ 173        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Spread Above Index 9.50% 9.50% 9.50% 9.50% 9.50% 9.50%    
Investment, Acquisition Date   Jun. 29, 2020   Jun. 29, 2020        
Investment Owned, Balance, Principal Amount $ 1,865 $ 1,865 $ 1,865 $ 1,822        
Investment Owned, at Cost 1,862 1,862 1,862 1,819        
Investment Owned, at Fair Value $ 1,831 $ 1,831 $ 1,831 $ 1,790        
Percent of net assets 0.70% 0.70% 0.70% 0.60% 0.70% 0.60%    
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SnapFitnessHoldingsIncMember   whfcl:SnapFitnessHoldingsIncMember        
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member] Leisure Facilities [Member]    
Investment, Acquisition Date   Jun. 29, 2020   Jun. 29, 2020        
Investment Owned, Balance, Shares | shares 1,000 1,000 1,000 1 1,000 1    
Investment Owned, at Cost $ 793 $ 793 $ 793 $ 793        
Investment Owned, at Fair Value $ 114 $ 114 $ 114 $ 70        
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SourceCodeHoldingsLLCMember   whfcl:SourceCodeHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Aug. 10, 2021   Aug. 10, 2021        
Investment Maturity Date Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027    
Investment Owned, Balance, Principal Amount $ 3,862 $ 3,862 $ 3,862 $ 3,872        
Investment Owned, at Cost 3,832 3,832 3,832 3,839        
Investment Owned, at Fair Value $ 3,862 $ 3,862 $ 3,862 $ 3,854        
Fair Value As A Percentage of Member's Equity   11.40%   11.10%        
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SourceCodeHoldingsLLCMember   whfcl:SourceCodeHoldingsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.92% 10.92% 10.92% 10.96% 10.92% 10.96%    
Investment, Acquisition Date   Aug. 10, 2021   Aug. 10, 2021        
Investment Maturity Date Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027 Jul. 30, 2027    
Investment Owned, Balance, Principal Amount $ 14,124 $ 14,124 $ 14,124 $ 14,162        
Investment Owned, at Cost 14,015 14,015 14,015 14,041        
Investment Owned, at Fair Value $ 14,124 $ 14,124 $ 14,124 $ 14,095        
Fair Value As A Percentage of Member's Equity   41.60%   40.70%        
Investment, Identifier [Axis]: Sterling Pure Blocker, LLC (d/b/a Banner Industries, Inc.) Class B Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:SterlingPureBlockerLlcMember   whfcl:SterlingPureBlockerLlcMember        
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Acquisition Date   Dec. 01, 2023   Dec. 01, 2023        
Investment Owned, Balance, Shares | shares 404,000 404,000 404,000 404 404,000 404    
Investment Owned, at Cost $ 404 $ 404 $ 404 $ 404        
Investment Owned, at Fair Value $ 285 $ 285 $ 285 $ 388        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Surge Amuze Holdings Inc [Member]   Surge Amuze Holdings Inc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.46% 10.46% 10.46% 10.46% 10.46% 10.46%    
Investment, Acquisition Date   Sep. 06, 2024   Sep. 06, 2024        
Investment Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029    
Investment Owned, Balance, Principal Amount $ 582 $ 582 $ 582 $ 584        
Investment Owned, at Cost 572 572 572 573        
Investment Owned, at Fair Value $ 583 $ 583 $ 583 $ 577        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Surge Amuze Holdings Inc [Member]   Surge Amuze Holdings Inc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] Base Rate [Member] Base Rate [Member] Prime Rate [Member] Base Rate [Member] Prime Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.20% 5.20% 5.20% 5.00% 5.20% 5.00%    
Investment Interest Rate 12.05% 12.05% 12.05% 12.50% 12.05% 12.50%    
Investment, Acquisition Date   Sep. 06, 2024   Sep. 06, 2024        
Investment Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029    
Investment Owned, Balance, Principal Amount $ 732 $ 732 $ 732 $ 585        
Investment Owned, at Cost 719 719 719 574        
Investment Owned, at Fair Value $ 724 $ 724 $ 724 $ 576        
Percent of net assets 0.30% 0.30% 0.30% 0.20% 0.30% 0.20%    
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Surge Amuze Holdings Inc [Member]   Surge Amuze Holdings Inc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.30% 10.30% 10.30% 10.44% 10.30% 10.44%    
Investment, Acquisition Date   Sep. 06, 2024   Sep. 06, 2024        
Investment Maturity Date Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029 Sep. 06, 2029    
Investment Owned, Balance, Principal Amount $ 5,722 $ 5,722 $ 5,722 $ 5,737        
Investment Owned, at Cost 5,621 5,621 5,621 5,629        
Investment Owned, at Fair Value $ 5,665 $ 5,665 $ 5,665 $ 5,643        
Percent of net assets 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%    
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Tot Group, Inc. [Member]   Tot Group, Inc. [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.50% 7.25% 7.50%    
Investment Interest Rate 11.55% 11.55% 11.55% 11.83% 11.55% 11.83%    
Investment, Acquisition Date   Jun. 28, 2024   Jun. 28, 2024        
Investment Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029    
Investment Owned, Balance, Principal Amount $ 1,107 $ 1,107 $ 1,107          
Investment Owned, at Cost 1,084 1,084 1,084          
Investment Owned, at Fair Value $ 1,084 $ 1,084 $ 1,084 $ (1)        
Percent of net assets 0.40% 0.40% 0.40%   0.40%      
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Tot Group, Inc. [Member]   Tot Group, Inc. [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.50% 7.25% 7.50%    
Investment Interest Rate 11.55% 11.55% 11.55% 11.83% 11.55% 11.83%    
Investment, Acquisition Date   Jun. 28, 2024   Jun. 28, 2024        
Investment Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029    
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Tot Group, Inc. [Member]   Tot Group, Inc. [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member] Transaction & Payment Processing Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.50% 7.25% 7.50%    
Investment Interest Rate 11.55% 11.55% 11.55% 11.83% 11.55% 11.83%    
Investment, Acquisition Date   Jun. 28, 2024   Jun. 28, 2024        
Investment Maturity Date Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029 Jun. 28, 2029    
Investment Owned, Balance, Principal Amount $ 9,180 $ 9,180 $ 9,180 $ 8,239        
Investment Owned, at Cost 9,002 9,002 9,002 8,074        
Investment Owned, at Fair Value $ 9,006 $ 9,006 $ 9,006 $ 8,067        
Percent of net assets 3.30% 3.30% 3.30% 2.80% 3.30% 2.80%    
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TabletrustBrandsLlcMember   whfcl:TabletrustBrandsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.75% 5.75% 5.75% 5.75% 5.75% 5.75%    
Investment Interest Rate 10.17% 10.17% 10.17% 10.22% 10.17% 10.22%    
Investment, Acquisition Date   Dec. 24, 2024   Dec. 24, 2024        
Investment Maturity Date Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028 Jun. 28, 2028    
Investment Owned, Balance, Principal Amount $ 2,499 $ 2,499 $ 2,499 $ 2,505        
Investment Owned, at Cost 2,464 2,464 2,464 2,468        
Investment Owned, at Fair Value $ 2,469 $ 2,469 $ 2,469 $ 2,468        
Fair Value As A Percentage of Member's Equity   7.30%   7.10%        
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Telestream Holdings Corporation [Member]   Telestream Holdings Corporation [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 9.75% 9.75% 9.75% 9.75% 9.75% 9.75%    
Investment, Acquisition Date   Oct. 15, 2020   Oct. 15, 2020        
Investment Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025    
Investment Owned, Balance, Principal Amount $ 1,156 $ 1,156 $ 1,156 $ 1,116        
Investment Owned, at Cost 1,051 1,051 1,051 1,051        
Investment Owned, at Fair Value $ 1,027 $ 1,027 $ 1,027 $ 1,009        
Investment, Interest Rate, Paid in Kind 14.17% 14.17% 14.17% 14.21% 14.17% 14.21%    
Percent of net assets 0.40% 0.40% 0.40% 0.40% 0.40% 0.40%    
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Telestream Holdings Corporation [Member]   Telestream Holdings Corporation [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals Technology Hardware, Storage & Peripherals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 9.75% 9.75% 9.75% 9.75% 9.75% 9.75%    
Investment, Acquisition Date   Oct. 15, 2020   Oct. 15, 2020        
Investment Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025    
Investment Owned, Balance, Principal Amount $ 19,213 $ 19,213 $ 19,213 $ 18,547        
Investment Owned, at Cost 17,496 17,496 17,496 17,496        
Investment Owned, at Fair Value $ 17,416 $ 17,416 $ 17,416 $ 17,063        
Investment, Interest Rate, Paid in Kind 14.17% 14.17% 14.17% 14.21% 14.17% 14.21%    
Percent of net assets 6.20% 6.20% 6.20% 5.90% 6.20% 5.90%    
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CromCorporationMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Water Utilities Water Utilities Water Utilities   Water Utilities      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.25% 5.25% 5.25%   5.25%      
Investment Interest Rate 9.54% 9.54% 9.54%   9.54%      
Investment, Acquisition Date   Mar. 05, 2025            
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031      
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CromCorporationMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Water Utilities Water Utilities Water Utilities   Water Utilities      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.25% 5.25% 5.25%   5.25%      
Investment Interest Rate 9.54% 9.54% 9.54%   9.54%      
Investment, Acquisition Date   Mar. 05, 2025            
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031      
Investment Owned, Balance, Principal Amount $ 144 $ 144 $ 144          
Investment Owned, at Cost 142 142 142          
Investment Owned, at Fair Value $ 142 $ 142 $ 142          
Fair Value As A Percentage of Member's Equity   0.40%            
Investment, Identifier [Axis]: The Crom Corporation First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:CromCorporationMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Water Utilities Water Utilities Water Utilities   Water Utilities      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]   Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.25% 5.25% 5.25%   5.25%      
Investment Interest Rate 9.54% 9.54% 9.54%   9.54%      
Investment, Acquisition Date   Mar. 05, 2025            
Investment Maturity Date Jan. 31, 2031 Jan. 31, 2031 Jan. 31, 2031   Jan. 31, 2031      
Investment Owned, Balance, Principal Amount $ 4,080 $ 4,080 $ 4,080          
Investment Owned, at Cost 4,020 4,020 4,020          
Investment Owned, at Fair Value $ 4,020 $ 4,020 $ 4,020          
Fair Value As A Percentage of Member's Equity   11.80%            
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TheKyjenCompanyLLCMember   whfcl:TheKyjenCompanyLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Products [Member] Household Products [Member] Household Products [Member] Household Products [Member] Household Products [Member] Household Products [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.50% 7.50% 7.50% 6.50% 7.50% 6.50%    
Investment Interest Rate 11.95% 11.95% 11.95% 10.97% 11.95% 10.97%    
Investment, Acquisition Date   Apr. 05, 2021   Apr. 05, 2021        
Investment Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026    
Investment Owned, Balance, Principal Amount $ 375 $ 375 $ 375 $ 798        
Investment Owned, at Cost 374 374 374 795        
Investment Owned, at Fair Value $ 321 $ 321 $ 321 $ 761        
Investment, Interest Rate, Paid in Kind 1.00% 1.00% 1.00% 0.75% 1.00% 0.75%    
Investment, Interest Rate, Paid in Cash 10.95% 10.95% 10.95% 10.22% 10.95% 10.22%    
Percent of net assets 0.10% 0.10% 0.10% 0.30% 0.10% 0.30%    
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TheKyjenCompanyLLCMember   whfcl:TheKyjenCompanyLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Products [Member] Household Products [Member] Household Products [Member] Household Products [Member] Household Products [Member] Household Products [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.50% 7.50% 7.50% 7.25% 7.50% 7.25%    
Investment Interest Rate 11.93% 11.93% 11.93% 12.05% 11.93% 12.05%    
Investment, Acquisition Date   Apr. 05, 2021   Apr. 05, 2021        
Investment Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026    
Investment Owned, Balance, Principal Amount $ 11,345 $ 11,345 $ 11,345 $ 11,350        
Investment Owned, at Cost 11,311 11,311 11,311 11,309        
Investment Owned, at Fair Value $ 10,668 $ 10,668 $ 10,668 $ 10,895        
Investment, Interest Rate, Paid in Kind 1.00% 1.00% 1.00% 0.75% 1.00% 0.75%    
Investment, Interest Rate, Paid in Cash 10.93% 10.93% 10.93% 11.30% 10.93% 11.30%    
Percent of net assets 3.80% 3.80% 3.80% 3.80% 3.80% 3.80%    
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TokenBuyerIncMember   whfcl:TokenBuyerIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 0.50% 0.50% 0.50% 0.50% 0.50% 0.50%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.44% 10.44% 10.44% 10.74% 10.44% 10.74%    
Investment, Acquisition Date   May 26, 2022   May 26, 2022        
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029    
Investment Owned, Balance, Principal Amount $ 5,031 $ 5,031 $ 5,031 $ 7,070        
Investment Owned, at Cost 4,841 4,841 4,841 6,709        
Investment Owned, at Fair Value $ 3,773 $ 3,773 $ 3,773 $ 5,658        
Percent of net assets 1.30% 1.30% 1.30% 2.00% 1.30% 2.00%    
Investment, Identifier [Axis]: Trailhead Media LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Trailhead Media L L C [Member]   Trailhead Media L L C [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 9.80% 9.80% 9.80% 9.82% 9.80% 9.82%    
Investment, Acquisition Date   Jan. 22, 2025   Dec. 30, 2024        
Investment Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029    
Investment Owned, at Fair Value $ 4 $ 4 $ 4          
Investment, Interest Rate, Paid in Kind 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Investment, Interest Rate, Paid in Cash 9.05% 9.05% 9.05% 9.07% 9.05% 9.07%    
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Trailhead Media L L C [Member]   Trailhead Media L L C [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment, Acquisition Date   Jan. 22, 2025   Dec. 30, 2024        
Investment Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029    
Investment Owned, at Fair Value $ 1 $ 1 $ 1          
Investment, Identifier [Axis]: Trailhead Media LLC, First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   Trailhead Media L L C [Member]   Trailhead Media L L C [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising Advertising Advertising    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 5.50% 5.50% 5.50%    
Investment Interest Rate 9.80% 9.80% 9.80% 9.82% 9.80% 9.82%    
Investment, Acquisition Date   Jan. 22, 2025   Dec. 30, 2024        
Investment Maturity Date Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029 Dec. 28, 2029    
Investment Owned, Balance, Principal Amount $ 6,644 $ 6,644 $ 6,644 $ 6,648        
Investment Owned, at Cost 6,549 6,549 6,549 6,548        
Investment Owned, at Fair Value $ 6,558 $ 6,558 $ 6,558 $ 6,548        
Investment, Interest Rate, Paid in Kind 0.75% 0.75% 0.75% 0.75% 0.75% 0.75%    
Investment, Interest Rate, Paid in Cash 9.05% 9.05% 9.05% 9.07% 9.05% 9.07%    
Fair Value As A Percentage of Member's Equity   19.30%            
Percent of net assets       2.30%   2.30%    
Investment, Identifier [Axis]: Transervice Holdings, Inc. (d/b/a Transervice Logistics, Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TranserviceHoldingsIncMember   whfcl:TranserviceHoldingsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics Air Freight & Logistics    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%    
Spread Above Index 7.25% 7.25% 7.25% 7.25% 7.25% 7.25%    
Investment Interest Rate 11.67% 11.67% 11.67% 11.71% 11.67% 11.71%    
Investment, Acquisition Date   Jun. 29, 2023   Jun. 29, 2023        
Investment Maturity Date Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028    
Investment Owned, Balance, Principal Amount $ 8,606 $ 8,606 $ 8,606 $ 8,663        
Investment Owned, at Cost 8,439 8,439 8,439 8,481        
Investment Owned, at Fair Value $ 8,628 $ 8,628 $ 8,628 $ 8,715        
Percent of net assets 3.10% 3.10% 3.10% 3.00% 3.10% 3.00%    
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TrimliteBuyerLLCMember   whfcl:TrimliteBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products Building Products Building Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember Canadian Overnight Repo Rate Average whfcl:CanadianDollarOfferedRateMember Canadian Overnight Repo Rate Average    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.50% 5.50% 5.50% 6.50% 5.50% 6.50%    
Investment Interest Rate 8.48% 8.48% 8.48% 9.99% 8.48% 9.99%    
Investment, Acquisition Date   Jul. 27, 2021   Jul. 27, 2021        
Investment Maturity Date Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027    
Investment Owned, Balance, Principal Amount         $ 18,984 $ 18,984    
Investment Owned, at Cost $ 15,016 $ 15,016 $ 15,016 $ 15,006        
Investment Owned, at Fair Value $ 13,170 $ 13,170 $ 13,170 $ 13,206        
Percent of net assets 4.70% 4.70% 4.70% 4.60% 4.70% 4.60%    
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%    
Investment Interest Rate 9.55% 9.55% 9.55% 9.83% 9.55% 9.83%    
Investment, Acquisition Date   Jun. 14, 2024   Jun. 14, 2024        
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029    
Investment Owned, at Fair Value $ 19 $ 19 $ 19 $ 9        
Fair Value As A Percentage of Member's Equity   0.10%            
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%    
Investment Interest Rate 9.55% 9.55% 9.55% 9.83% 9.55% 9.83%    
Investment, Acquisition Date   Jun. 14, 2024   Jun. 14, 2024        
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029    
Investment Owned, at Fair Value $ 12 $ 12 $ 12 $ 12        
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TriplepointAcquisitionHoldingsLlcMember   whfcl:TriplepointAcquisitionHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 5.25% 5.25% 5.25% 5.50% 5.25% 5.50%    
Investment Interest Rate 9.55% 9.55% 9.55% 9.83% 9.55% 9.83%    
Investment, Acquisition Date   Jun. 14, 2024   Jun. 14, 2024        
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029    
Investment Owned, Balance, Principal Amount $ 5,336 $ 5,336 $ 5,336 $ 5,349        
Investment Owned, at Cost 5,247 5,247 5,247 5,254        
Investment Owned, at Fair Value $ 5,365 $ 5,365 $ 5,365 $ 5,338        
Fair Value As A Percentage of Member's Equity   15.80%   15.40%        
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TurnberrySolutionsInc.Member   whfcl:TurnberrySolutionsInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 5.75% 6.00% 5.75%    
Investment Interest Rate 10.42% 10.42% 10.42% 10.21% 10.42% 10.21%    
Investment, Acquisition Date   Aug. 10, 2021   Aug. 10, 2021        
Investment Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026    
Investment Owned, at Fair Value $ 4 $ 4 $ 4 $ 4        
Investment, Identifier [Axis]: Turnberry Solutions, Inc.First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TurnberrySolutionsInc.Member   whfcl:TurnberrySolutionsInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 5.75% 6.00% 5.75%    
Investment Interest Rate 10.42% 10.42% 10.42% 10.21% 10.42% 10.21%    
Investment, Acquisition Date   Aug. 10, 2021   Aug. 10, 2021        
Investment Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026    
Investment Owned, Balance, Principal Amount $ 5,949 $ 5,949 $ 5,949 $ 5,964        
Investment Owned, at Cost 5,915 5,915 5,915 5,924        
Investment Owned, at Fair Value $ 5,949 $ 5,949 $ 5,949 $ 5,964        
Fair Value As A Percentage of Member's Equity   17.50%   17.20%        
Investment, Identifier [Axis]: Twin Ridge CRS, LP (d/b/a CRS OneSource) Class A Common Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:TwinRidgeCrsLpMember   whfcl:TwinRidgeCrsLpMember        
Investment, Type [Extensible Enumeration] whfcl:ClassCommonUnitsMember whfcl:ClassCommonUnitsMember whfcl:ClassCommonUnitsMember us-gaap:CommonClassAMember whfcl:ClassCommonUnitsMember us-gaap:CommonClassAMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors Food Distributors    
Investment, Acquisition Date   May 10, 2024   May 10, 2024        
Investment Owned, Balance, Shares | shares 63,000 63,000 63,000 63 63,000 63    
Investment Owned, at Cost $ 317 $ 317 $ 317 $ 317        
Investment Owned, at Fair Value $ 331 $ 331 $ 331 $ 350        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: UserZoom Technologies, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:UserzoomTechnologiesIncMember   whfcl:NavigaIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software Application Software Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 7.50% 7.50% 7.50% 7.50% 7.50% 7.50%    
Investment Interest Rate 11.80% 11.80% 11.80% 12.75% 11.80% 12.75%    
Investment, Acquisition Date   Jan. 12, 2023   Jan. 12, 2023        
Investment Maturity Date Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029    
Investment Owned, Balance, Principal Amount $ 9,819 $ 9,819 $ 9,819 $ 9,819        
Investment Owned, at Cost 9,629 9,629 9,629 9,618        
Investment Owned, at Fair Value $ 9,781 $ 9,781 $ 9,781 $ 9,809        
Percent of net assets 3.50% 3.50% 3.50% 3.40% 3.50% 3.40%    
Investment, Identifier [Axis]: Vistria Blocked MGT Investor, LP (d/b/a MGT Consulting Group) Series A Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:VistriaBlockedMgtInvestorLpMember   whfcl:VistriaBlockedMgtInvestorLpMember        
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember whfcl:SeriesUnitsMember whfcl:ClassAUnitsMember whfcl:SeriesUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services IT Consulting And Other Services    
Investment, Acquisition Date   Apr. 10, 2023   Apr. 10, 2023        
Investment Owned, at Cost $ 314 $ 314 $ 314 $ 314        
Investment Owned, at Fair Value $ 516 $ 516 $ 516 $ 493        
Percent of net assets 0.20% 0.20% 0.20% 0.20% 0.20% 0.20%    
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   W Electric Intermediate Holdings, LLC [Member]   W Electric Intermediate Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.82% 10.82% 10.82% 10.86% 10.82% 10.86%    
Investment, Acquisition Date   Aug. 15, 2024   Aug. 15, 2024        
Investment Maturity Date Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029    
Investment Owned, at Fair Value $ 15 $ 15 $ 15 $ 9        
Investment, Interest Rate, Paid in Kind 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Investment, Interest Rate, Paid in Cash 9.82% 9.82% 9.82% 9.86% 9.82% 9.86%    
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation) - First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   W Electric Intermediate Holdings, LLC [Member]   W Electric Intermediate Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components Industrial Machinery & Supplies & Components    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.82% 10.82% 10.82% 10.86% 10.82% 10.86%    
Investment, Acquisition Date   Aug. 15, 2024   Aug. 15, 2024        
Investment Maturity Date Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029 Aug. 15, 2029    
Investment Owned, Balance, Principal Amount $ 12,322 $ 12,322 $ 12,322 $ 12,322        
Investment Owned, at Cost 12,135 12,135 12,135 12,124        
Investment Owned, at Fair Value $ 12,289 $ 12,289 $ 12,289 $ 12,216        
Investment, Interest Rate, Paid in Kind 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Investment, Interest Rate, Paid in Cash 9.82% 9.82% 9.82% 9.86% 9.82% 9.86%    
Percent of net assets 4.40% 4.40% 4.40% 4.30% 4.40% 4.30%    
Investment, Identifier [Axis]: WCHG Buyer, Inc. First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WchgBuyerInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember   whfcl:FirstLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Commodity Chemicals [Member] Commodity Chemicals [Member] Commodity Chemicals [Member]   Commodity Chemicals [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Investment, Interest Rate, Floor 1.00% 1.00% 1.00%   1.00%      
Spread Above Index 5.00% 5.00% 5.00%   5.00%      
Investment Interest Rate 9.30% 9.30% 9.30%   9.30%      
Investment, Acquisition Date   Feb. 06, 2025            
Investment Maturity Date Apr. 10, 2031 Apr. 10, 2031 Apr. 10, 2031   Apr. 10, 2031      
Investment Owned, Balance, Principal Amount $ 7,000 $ 7,000 $ 7,000          
Investment Owned, at Cost 6,966 6,966 6,966          
Investment Owned, at Fair Value $ 6,966 $ 6,966 $ 6,966          
Percent of net assets 2.50% 2.50% 2.50%   2.50%      
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember        
Investment, Type [Extensible Enumeration] Equity Investments Equity Investments Equity Investments Equity Investments Equity Investments Equity Investments    
Investment Owned, at Fair Value $ 22,299 $ 22,299 $ 22,299 $ 22,741       22,782
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WHFSTRSOhioSeniorLoanFundMember   whfcl:WHFSTRSOhioSeniorLoanFundMember        
Investment, Type [Extensible Enumeration] whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]    
Investment, Acquisition Date   Jul. 19, 2019   Jul. 19, 2019        
Investment Owned, Balance, Shares | shares 21,104,000 21,104,000 21,104,000 21,104 21,104,000 21,104    
Investment Owned, at Cost $ 21,104 $ 21,104 $ 21,104 $ 21,104        
Investment Owned, at Fair Value $ 22,299 $ 22,299 $ 22,299 $ 22,741        
Percent of net assets 7.90% 7.90% 7.90% 7.90% 7.90% 7.90%    
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember   whfcl:WHFSTRSOhioSeniorLoanFundLLCMember        
Investment, Type [Extensible Enumeration] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member] Subordinated Debt [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member] Specialized Finance [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment, Acquisition Date   Jul. 19, 2019   Jul. 19, 2019        
Investment Owned, Balance, Principal Amount $ 84,416 $ 84,416 $ 84,416 $ 84,416        
Investment Owned, at Cost 84,416 84,416 84,416 84,416        
Investment Owned, at Fair Value $ 84,416 $ 84,416 $ 84,416 $ 84,416       $ 84,416
Percent of net assets 30.00% 30.00% 30.00% 29.50% 30.00% 29.50%    
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Delayed Draw Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.55% 10.55% 10.55% 10.58% 10.55% 10.58%    
Investment, Acquisition Date   Aug. 01, 2024   Aug. 01, 2024        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, at Fair Value $ (11) $ (11) $ (11) $ 2        
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.55% 10.55% 10.55% 10.58% 10.55% 10.58%    
Investment, Acquisition Date   Aug. 01, 2024   Aug. 01, 2024        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 258 $ 258 $ 258 $ 258        
Investment Owned, at Cost 253 253 253 253        
Investment Owned, at Fair Value $ 253 $ 253 $ 253 $ 254        
Percent of net assets 0.10% 0.10% 0.10% 0.10% 0.10% 0.10%    
Investment, Identifier [Axis]: Wamp;A Intermediate Co., LLC First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.25% 6.25% 6.25% 6.25% 6.25% 6.25%    
Investment Interest Rate 10.55% 10.55% 10.55% 10.58% 10.55% 10.58%    
Investment, Acquisition Date   Aug. 01, 2024   Aug. 01, 2024        
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 7,669 $ 7,669 $ 7,669 $ 7,689        
Investment Owned, at Cost 7,536 7,536 7,536 7,548        
Investment Owned, at Fair Value $ 7,538 $ 7,538 $ 7,538 $ 7,555        
Percent of net assets 2.70% 2.70% 2.70% 2.60% 2.70% 2.60%    
Investment, Identifier [Axis]: What If Media Group, LLC Common Units                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WhatIfMediaGroupLLCMember   whfcl:WhatIfMediaGroupLLCMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member]    
Investment, Acquisition Date   Jul. 02, 2021   Jul. 02, 2021        
Investment Owned, Balance, Shares | shares 3,081,000 3,081,000 3,081,000 3,081 3,081,000 3,081    
Investment Owned, at Cost $ 851 $ 851 $ 851 $ 851        
Investment Owned, at Fair Value $ 1,762 $ 1,762 $ 1,762 $ 1,756        
Percent of net assets 0.60% 0.60% 0.60% 0.60% 0.60% 0.60%    
Investment, Identifier [Axis]: Whitestone Home Furnishings, LLC (d/b/a Saatva, Inc.) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:WhitestoneHomeFurnishingsLlcMember   whfcl:WhitestoneHomeFurnishingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member] Home Furnishings [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.00% 6.00% 6.00% 6.00% 6.00% 6.00%    
Investment Interest Rate 10.32% 10.32% 10.32% 10.46% 10.32% 10.46%    
Investment, Acquisition Date   Nov. 06, 2023   Nov. 06, 2023        
Investment Maturity Date Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026    
Investment Owned, Balance, Principal Amount $ 2,915 $ 2,915 $ 2,915 $ 2,930        
Investment Owned, at Cost 2,879 2,879 2,879 2,887        
Investment Owned, at Fair Value $ 2,926 $ 2,926 $ 2,926 $ 2,930        
Percent of net assets 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Revolving Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ZephyrBuyerL.p.Member   whfcl:ZephyrBuyerL.p.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.80% 10.80% 10.80% 10.83% 10.80% 10.83%    
Investment, Acquisition Date   Jan. 31, 2024   Jan. 31, 2024        
Investment Maturity Date Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030    
Investment Owned, at Fair Value $ 36 $ 36 $ 36 $ 48        
Investment, Identifier [Axis]: Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC) First Lien Secured Term Loan                
Schedule of Investments [Line Items]                
Investment, Issuer Name [Extensible Enumeration]   whfcl:ZephyrBuyerL.p.Member   whfcl:ZephyrBuyerL.p.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember whfcl:FirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member] Interactive Media And Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateMember    
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00% 1.00% 1.00%    
Spread Above Index 6.50% 6.50% 6.50% 6.50% 6.50% 6.50%    
Investment Interest Rate 10.80% 10.80% 10.80% 10.83% 10.80% 10.83%    
Investment, Acquisition Date   Jan. 31, 2024   Jan. 31, 2024        
Investment Maturity Date Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030 Jan. 31, 2030    
Investment Owned, Balance, Principal Amount $ 14,052 $ 14,052 $ 14,052 $ 14,087        
Investment Owned, at Cost 13,769 13,769 13,769 13,789        
Investment Owned, at Fair Value $ 14,192 $ 14,192 $ 14,192 $ 14,166        
Percent of net assets 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%    
Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 642,925 $ 642,925 $ 642,925 $ 631,941        
Investment Owned, at Fair Value $ 605,623 $ 605,623 $ 605,623 $ 596,626        
Percent of net assets 215.30% 215.30% 215.30% 208.40% 215.30% 208.40%    
Money Market Funds                
Schedule of Investments [Line Items]                
Money Market Funds amortized cost $ 14,322 $ 14,322 $ 14,322 $ 13,249        
Money Market Fair Value $ 14,322 $ 14,322 $ 14,322 $ 13,249        
Percent of net assets 5.10% 5.10% 5.10% 4.60% 5.10% 4.60%    
Money Market Funds | STRS JV                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 1,025 $ 1,025 $ 1,025          
Money Market Funds amortized cost       $ 767        
Money Market Fair Value $ 1,025 $ 1,025 $ 1,025 $ 767        
Percent of net assets 3.00% 3.00% 3.00% 2.20% 3.00% 2.20%    
Goldman Sachs Money Market Fund (CUSIP: 38141W315)                
Schedule of Investments [Line Items]                
Weighted average interest rate 4.19% 4.19% 4.19% 4.33% 4.19% 4.33%    
Money Market Funds amortized cost $ 2,879 $ 2,879 $ 2,879 $ 837        
Money Market Fair Value $ 2,879 $ 2,879 $ 2,879 $ 837        
Percent of net assets 1.00% 1.00% 1.00% 0.30% 1.00% 0.30%    
Goldman Sachs Money Market Fund (CUSIP: 38141W315) | STRS JV                
Schedule of Investments [Line Items]                
Weighted average interest rate 4.19% 4.19% 4.19% 4.33% 4.19% 4.33%    
Money Market Funds amortized cost $ 279 $ 279 $ 279 $ 242        
Money Market Fair Value $ 279 $ 279 $ 279 $ 242        
Percent of net assets 0.80% 0.80% 0.80% 0.70% 0.80% 0.70%    
JPMORGAN U.S. Treas Plus Money Market Fund | STRS JV                
Schedule of Investments [Line Items]                
Weighted average interest rate 4.22% 4.22% 4.22% 4.39% 4.22% 4.39%    
Money Market Funds amortized cost $ 746 $ 746 $ 746 $ 525        
Money Market Fair Value $ 746 $ 746 $ 746 $ 525        
Percent of net assets 2.20% 2.20% 2.20% 1.50% 2.20% 1.50%    
Invesco Treasury Money Market Fund (CUSIP: X9USDINVE)                
Schedule of Investments [Line Items]                
Weighted average interest rate 3.70% 3.70% 3.70% 3.83% 3.70% 3.83%    
Money Market Funds amortized cost $ 11,443 $ 11,443 $ 11,443 $ 12,412        
Money Market Fair Value $ 11,443 $ 11,443 $ 11,443 $ 12,412        
Percent of net assets 4.10% 4.10% 4.10% 4.30% 4.10% 4.30%    
Advertising                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 18,467 $ 18,467 $ 18,467 $ 11,937        
Investment Owned, at Fair Value 18,567 $ 18,567 18,567 $ 12,035        
Fair Value As A Percentage of Member's Equity   54.80%   34.80%        
Advertising | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 1,192 $ 1,192 1,192 $ 16,365        
Investment Owned, at Fair Value $ 1,212 $ 1,212 $ 1,212 $ 16,862        
Percent of net assets 0.40% 0.40% 0.40% 6.00% 0.40% 6.00%    
Air Freight & Logistics                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 3,281 $ 3,281 $ 3,281 $ 3,286        
Investment Owned, at Fair Value 3,303 $ 3,303 3,303 $ 3,311        
Fair Value As A Percentage of Member's Equity   9.70%   9.60%        
Air Freight & Logistics | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 29,720 $ 29,720 29,720 $ 29,360        
Investment Owned, at Fair Value $ 29,076 $ 29,076 $ 29,076 $ 28,518        
Percent of net assets 10.20% 10.20% 10.20% 9.90% 10.20% 9.90%    
Aerospace & Defense                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 3,626 $ 3,626 $ 3,626 $ 3,633        
Investment Owned, at Fair Value 3,710 $ 3,710 3,710 $ 3,682        
Fair Value As A Percentage of Member's Equity   11.00%   10.60%        
Application Software | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 36,202 $ 36,202 36,202 $ 36,508        
Investment Owned, at Fair Value $ 26,439 $ 26,439 $ 26,439 $ 26,924        
Percent of net assets 9.40% 9.40% 9.40% 9.40% 9.40% 9.40%    
Broadline Retail                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 18,595 $ 18,595 $ 18,595 $ 18,577        
Investment Owned, at Fair Value 17,831 $ 17,831 17,831 $ 17,827        
Fair Value As A Percentage of Member's Equity   52.60%   51.50%        
Broadline Retail | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 4,063 $ 4,063 4,063 $ 4,556        
Investment Owned, at Fair Value $ 4,080 $ 4,080 $ 4,080 $ 4,580        
Percent of net assets 1.40% 1.40% 1.40% 1.60% 1.40% 1.60%    
Building Products                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 13,416 $ 13,416 $ 13,416 $ 13,445        
Investment Owned, at Fair Value 13,372 $ 13,372 13,372 $ 13,437        
Fair Value As A Percentage of Member's Equity   39.40%   38.80%        
Building Products | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 24,329 $ 24,329 24,329 $ 15,006        
Investment Owned, at Fair Value $ 22,483 $ 22,483 $ 22,483 $ 13,206        
Percent of net assets 8.00% 8.00% 8.00% 4.60% 8.00% 4.60%    
Construction & Engineering                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 15,887 $ 15,887 $ 15,887 $ 16,016        
Investment Owned, at Fair Value 16,113 $ 16,113 16,113 $ 16,253        
Fair Value As A Percentage of Member's Equity   47.50%   47.00%        
Construction & Engineering | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 11,600 $ 11,600 11,600 $ 3,539        
Investment Owned, at Fair Value $ 11,592 $ 11,592 $ 11,592 $ 3,539        
Percent of net assets 4.20% 4.20% 4.20% 1.20% 4.20% 1.20%    
Data Processing & Outsourced Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 14,135 $ 14,135 $ 14,135 $ 14,234        
Investment Owned, at Fair Value 12,704 $ 12,704 12,704 $ 12,885        
Fair Value As A Percentage of Member's Equity   37.40%   37.20%        
Data Processing & Outsourced Services | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 27,843 $ 27,843 27,843 $ 28,409        
Investment Owned, at Fair Value $ 27,986 $ 27,986 $ 27,986 $ 28,572        
Percent of net assets 9.90% 9.90% 9.90% 10.00% 9.90% 10.00%    
Diversified Support Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 18,744 $ 18,744 $ 18,744 $ 19,107        
Investment Owned, at Fair Value 18,810 $ 18,810 18,810 $ 19,282        
Fair Value As A Percentage of Member's Equity   55.30%   55.70%        
Diversified Support Services | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 9,680 $ 9,680 9,680 $ 9,559        
Investment Owned, at Fair Value $ 9,571 $ 9,571 $ 9,571 $ 9,414        
Percent of net assets 3.40% 3.40% 3.40% 3.30% 3.40% 3.30%    
Electrical Components & Equipment                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 3,472 $ 3,472 $ 3,472 $ 3,479        
Investment Owned, at Fair Value 3,472 $ 3,472 3,472 $ 3,479        
Fair Value As A Percentage of Member's Equity   10.20%   10.10%        
Environmental & Facilities Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 29,489 $ 29,489 29,489 $ 29,529        
Investment Owned, at Fair Value 29,818 $ 29,818 29,818 $ 29,963        
Fair Value As A Percentage of Member's Equity   87.90%   86.60%        
Health Care Facilities                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 8,199 $ 8,199 8,199 $ 7,944        
Investment Owned, at Fair Value 8,330 $ 8,330 8,330 $ 8,004        
Fair Value As A Percentage of Member's Equity   24.60%   23.10%        
Health Care Facilities | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 8,564 $ 8,564 8,564 $ 8,694        
Investment Owned, at Fair Value $ 8,573 $ 8,573 $ 8,573 $ 8,660        
Percent of net assets 3.10% 3.10% 3.10% 3.00% 3.10% 3.00%    
Health Care Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 4,891 $ 4,891 $ 4,891 $ 4,898        
Investment Owned, at Fair Value 5,049 $ 5,049 5,049 $ 4,995        
Fair Value As A Percentage of Member's Equity   14.80%   14.40%        
Health Care Services | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 19,536 $ 19,536 19,536 $ 19,577        
Investment Owned, at Fair Value $ 19,539 $ 19,539 $ 19,539 $ 19,589        
Percent of net assets 7.00% 7.00% 7.00% 6.90% 7.00% 6.90%    
Health Care Supplies                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 4,871 $ 4,871 $ 4,871 $ 7,461        
Investment Owned, at Fair Value 4,972 $ 4,972 4,972 $ 7,696        
Fair Value As A Percentage of Member's Equity   14.60%   22.20%        
Health Care Supplies | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 20,163 $ 20,163 20,163 $ 20,142        
Investment Owned, at Fair Value $ 19,163 $ 19,163 $ 19,163 $ 19,535        
Percent of net assets 6.80% 6.80% 6.80% 6.80% 6.80% 6.80%    
Human Resource & Employment Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 2,496 $ 2,496 $ 2,496          
Investment Owned, at Fair Value 2,496 $ 2,496 2,496          
Fair Value As A Percentage of Member's Equity   7.40%            
Human Resource & Employment Services | Debt Investments                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 2,912 $ 2,912 2,912          
Investment Owned, at Fair Value $ 2,912 $ 2,912 $ 2,912          
Percent of net assets 1.00% 1.00% 1.00%   1.00%      
Household Appliances                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 7,659 $ 7,659 $ 7,659 $ 7,649        
Investment Owned, at Fair Value 7,925 $ 7,925 7,925 $ 7,632        
Fair Value As A Percentage of Member's Equity   23.40%   22.00%        
Household Appliances | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 20,517 $ 20,517 20,517 $ 22,326        
Investment Owned, at Fair Value $ 19,409 $ 19,409 $ 19,409 $ 21,255        
Percent of net assets 6.80% 6.80% 6.80% 7.40% 6.80% 7.40%    
Industrial Machinery & Supplies & Components | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 12,135 $ 12,135 $ 12,135 $ 12,124        
Investment Owned, at Fair Value $ 12,304 $ 12,304 $ 12,304 $ 12,225        
Percent of net assets 4.40% 4.40% 4.40% 4.30% 4.40% 4.30%    
IT Consulting And Other Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 32,938 $ 32,938 $ 32,938 $ 32,427        
Investment Owned, at Fair Value 33,270 $ 33,270 33,270 $ 32,720        
Fair Value As A Percentage of Member's Equity   98.00%   94.60%        
Leisure Products | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Leisure Products   Leisure Products    
Investment Owned, at Cost 46,549 $ 46,549 46,549 $ 45,674        
Investment Owned, at Fair Value $ 23,451 $ 23,451 $ 23,451 $ 23,298        
Percent of net assets 8.40% 8.40% 8.40% 8.10% 8.40% 8.10%    
Packaged Foods & Meats                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 6,988 $ 6,988 $ 6,988 $ 6,939        
Investment Owned, at Fair Value 7,068 $ 7,068 7,068 $ 7,009        
Fair Value As A Percentage of Member's Equity   20.90%   20.20%        
Packaged Foods & Meats | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 4,072 $ 4,072 4,072 $ 4,024        
Investment Owned, at Fair Value $ 4,138 $ 4,138 $ 4,138 $ 4,087        
Percent of net assets 1.40% 1.40% 1.40% 1.40% 1.40% 1.40%    
Paper & Plastic Packaging Products & Materials                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 14,897 $ 14,897 $ 14,897 $ 14,964        
Investment Owned, at Fair Value 14,839 $ 14,839 14,839 $ 14,881        
Fair Value As A Percentage of Member's Equity   43.80%   43.20%        
Personal Products                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 3,872 $ 3,872 3,872          
Investment Owned, at Fair Value 3,872 $ 3,872 3,872          
Fair Value As A Percentage of Member's Equity   11.40%            
Pharmaceuticals                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 16,392 $ 16,392 16,392 $ 16,411        
Investment Owned, at Fair Value 15,954 $ 15,954 15,954 $ 15,461        
Fair Value As A Percentage of Member's Equity   47.00%   44.70%        
Real Estate Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 14,626 $ 14,626 14,626 $ 14,554        
Investment Owned, at Fair Value 13,847 $ 13,847 13,847 $ 13,782        
Fair Value As A Percentage of Member's Equity   40.80%   39.80%        
Research & Consulting Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 11,958 $ 11,958 11,958 $ 11,900        
Investment Owned, at Fair Value 12,027 $ 12,027 12,027 $ 11,977        
Fair Value As A Percentage of Member's Equity   35.40%   34.60%        
Research & Consulting Services | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Specialized Consumer Services [Member]   Specialized Consumer Services [Member]    
Investment Owned, at Cost 4,815 $ 4,815 4,815 $ 4,823        
Investment Owned, at Fair Value $ 4,917 $ 4,917 $ 4,917 $ 4,927        
Percent of net assets 1.70% 1.70% 1.70% 1.70% 1.70% 1.70%    
Systems Software | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 16,613 $ 16,613 $ 16,613 $ 16,573        
Investment Owned, at Fair Value $ 17,339 $ 17,339 $ 17,339 $ 17,267        
Percent of net assets 6.10% 6.10% 6.10% 5.90% 6.10% 5.90%    
Technology Hardware, Storage & Peripherals                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 17,847 $ 17,847 $ 17,847 $ 17,880        
Investment Owned, at Fair Value 17,986 $ 17,986 17,986 $ 17,949        
Fair Value As A Percentage of Member's Equity   53.00%   51.80%        
Technology Hardware, Storage & Peripherals | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration]       Wireless Telecommunication Services   Wireless Telecommunication Services    
Investment Owned, at Cost 18,547 $ 18,547 18,547 $ 18,547        
Investment Owned, at Fair Value $ 18,443 $ 18,443 $ 18,443 $ 18,072        
Percent of net assets 6.60% 6.60% 6.60% 6.30% 6.60% 6.30%    
Water Utilities                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 4,162 $ 4,162 $ 4,162          
Investment Owned, at Fair Value 4,162 $ 4,162 4,162          
Fair Value As A Percentage of Member's Equity   12.20%            
Distributors                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 9,310 $ 9,310 9,310 $ 9,307        
Investment Owned, at Fair Value 9,368 $ 9,368 9,368 $ 9,372        
Fair Value As A Percentage of Member's Equity   27.60%   27.10%        
Distributors | Debt Investments                
Schedule of Investments [Line Items]                
Investment, Issuer Geographic Region [Extensible Enumeration]       srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost 10,456 $ 10,456 10,456 $ 10,563        
Investment Owned, at Fair Value $ 10,563 $ 10,563 $ 10,563 $ 10,690        
Percent of net assets 3.70% 3.70% 3.70% 3.70% 3.70% 3.70%    
Food Distributors                
Schedule of Investments [Line Items]                
Investment Owned, at Cost $ 4,911 $ 4,911 $ 4,911 $ 4,919        
Investment Owned, at Fair Value 4,981 $ 4,981 4,981 $ 4,993        
Fair Value As A Percentage of Member's Equity   14.70%   14.40%        
Wireless Telecommunication Services                
Schedule of Investments [Line Items]                
Investment Owned, at Cost 6,246 $ 6,246 6,246 $ 6,256        
Investment Owned, at Fair Value $ 6,314 $ 6,314 $ 6,314 $ 6,332        
Fair Value As A Percentage of Member's Equity   18.60%   18.30%        
v3.25.1
INVESTMENTS - Superscript (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
STRS JV's portfolio company investments as a percentage of members' equity 231.30% 224.40%
Investments, fair value $ 650,999 $ 642,213
STRS JV    
Schedule of Investments [Line Items]    
STRS JV's portfolio company investments as a percentage of members' equity 914.00% 852.30%
STRS JV's portfolio company investments as a percentage of total assets 95.90% 95.40%
Outstanding commitments to fund investments $ 30,747 $ 24,724
Investments, fair value $ 310,160 $ 294,957
v3.25.1
INVESTMENTS - Forward Currency Contracts (Details)
€ in Thousands, £ in Thousands, $ in Thousands, $ in Thousands
Mar. 31, 2025
USD ($)
Mar. 31, 2025
CAD ($)
Mar. 31, 2025
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
GBP (£)
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, CAD, Settlement Date 5/7/25            
Schedule of Investments [Line Items]            
Currency to be sold   $ 631        
Currency to be purchased $ 492          
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, EUR, Settlement Date 5/7/25            
Schedule of Investments [Line Items]            
Currency to be sold | €     € 773      
Currency to be purchased 950          
Net Amount of Derivative Liabilities 31          
Open Forward Foreign Currency Contract, Identifier [Axis]: whfcl_cnst_string_ForwardCurrencyContractsMorganStanleyEurSettlementDate272024            
Schedule of Investments [Line Items]            
Currency to be sold | €         € 681  
Currency to be purchased       $ 492    
Net Amount of Derivative Liabilities       (17)    
Open Forward Foreign Currency Contract, Identifier [Axis]: whfcl_cnst_string_ForwardCurrencyContractsMorganStanleyGbpSettlementDate272024            
Schedule of Investments [Line Items]            
Currency to be sold | £           £ 870
Currency to be purchased       950    
Net Amount of Derivative Liabilities       (47)    
STRS JV            
Schedule of Investments [Line Items]            
Net Amount of Derivative Liabilities $ 31     $ (64)    
v3.25.1
INVESTMENTS - Selected Balance Sheet Information For STRS JV (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Assets      
Investments, fair value $ 650,999 $ 642,213  
Cash and cash equivalents 11,444 12,424 $ 10,723
Total assets 678,767 676,821  
Liabilities      
Credit facility 361,133    
Interest payable on credit facility 3,591 1,821  
Total liabilities 397,318 390,687  
Total liabilities and total net assets 678,767 676,821  
Investments, amortized cost 706,224 695,240  
Unamortized debt issuance costs 3,503 2,876  
STRS JV      
Assets      
Investments, fair value 310,160 294,957  
Cash and cash equivalents 11,151 12,454  
Interest receivable 1,862 1,427  
Amount receivable on unsettled investment transactions 288 143  
Unrealized appreciation on foreign currency forward contracts   64  
Other assets 55 32  
Total assets 323,516 309,077  
Liabilities      
Credit facility 156,171 141,057  
Note payable to members 128,459 128,459  
Interest payable on credit facility 838 807  
Interest payable on notes to members 3,475 3,589  
Unrealized depreciation on foreign currency forward contracts 31    
Other liabilities 607 558  
Total liabilities 289,581 274,470  
Members' equity 33,935 34,607  
Total liabilities and total net assets 323,516 309,077  
Investments, amortized cost 311,375 296,752  
Unamortized debt issuance costs $ 2,889 $ 3,024  
v3.25.1
INVESTMENTS - Selected Statement of Operations Information For STRS JV (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Schedule of Investments [Line Items]    
Total investment income $ 18,801 $ 25,475
Administrative service fees 171 171
Net investment income after excise tax 6,843 10,815
Net increase (decrease) in net assets resulting from operations 4,264 5,969
STRS JV    
Schedule of Investments [Line Items]    
Interest and fee income 8,535 10,089
Total investment income 8,535 10,089
Interest expense on credit facility 3,009 3,756
Interest expense on notes to members 3,475 3,800
Administrative service fees 155 162
Other expenses 156 216
Total expenses, before fees waived 6,795 7,934
Net investment income after excise tax 1,740 2,155
Net realized gains (losses) on investments and foreign currency transactions 65 (112)
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions (375) 1,187
Net increase (decrease) in net assets resulting from operations $ 1,430 $ 3,230
v3.25.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 650,999 $ 642,213
First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 516,563 502,693
Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 3,442 8,342
Unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,202 1,175
Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 84,416 84,416
Equity (excluding STRS JV)    
FAIR VALUE MEASUREMENTS    
Investments, fair value 23,077 22,846
Equity in STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 22,299 22,741
Level 1    
FAIR VALUE MEASUREMENTS    
Money Market Fair Value 14,322 13,249
Level 2 | Foreign currency forward contracts    
FAIR VALUE MEASUREMENTS    
Investments, fair value   20
Level 3    
FAIR VALUE MEASUREMENTS    
Investments, fair value 628,700 619,472
Level 3 | First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 516,563 502,693
Level 3 | Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 3,442 8,342
Level 3 | Unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,202 1,175
Level 3 | Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 84,416 84,416
Level 3 | Equity (excluding STRS JV)    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 23,077 $ 22,846
v3.25.1
FAIR VALUE MEASUREMENTS - Level 3 Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair value measurements    
Fair value, beginning of period $ 619,472 $ 673,386
Funding of investments 47,222 58,202
Non-cash interest income 691 2,032
Accretion of discount 940 1,116
Proceeds from paydowns and sales (37,473) (54,329)
Realized gains (losses) $ (395) $ (6,148)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain (Loss) on Sale of Investments Gain (Loss) on Sale of Investments
Net unrealized appreciation (depreciation) $ (1,757) $ 1,002
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Debt and Equity Securities, Unrealized Gain (Loss) Debt and Equity Securities, Unrealized Gain (Loss)
Fair value, end of period $ 628,700 $ 675,261
Change in unrealized appreciation (depreciation) on investments still held (1,230) (16,670)
First lien secured loans    
Fair value measurements    
Fair value, beginning of period 502,693 555,878
Funding of investments 47,222 58,085
Non-cash interest income 564 2,016
Accretion of discount 892 1,100
Proceeds from paydowns and sales (32,473) (52,289)
Conversions   (8,852)
Realized gains (losses) (395) (331)
Net unrealized appreciation (depreciation) (1,940) 6,662
Fair value, end of period 516,563 562,269
Change in unrealized appreciation (depreciation) on investments still held (1,460) (2,738)
Second lien secured loans    
Fair value measurements    
Fair value, beginning of period 8,342 16,246
Non-cash interest income 100  
Accretion of discount 47 15
Proceeds from paydowns and sales (5,000) (2,040)
Conversions   (11,769)
Realized gains (losses)   (5,817)
Net unrealized appreciation (depreciation) (47) 8,313
Fair value, end of period 3,442 4,948
Change in unrealized appreciation (depreciation) on investments still held   45
Unsecured Loans    
Fair value measurements    
Fair value, beginning of period 1,175 167
Non-cash interest income 27 16
Accretion of discount 1 1
Conversions   1,053
Net unrealized appreciation (depreciation) (1) 2
Fair value, end of period 1,202 1,239
Change in unrealized appreciation (depreciation) on investments still held (1) 1
Subordinated Note to STRS JV    
Fair value measurements    
Fair value, beginning of period 84,416 84,416
Fair value, end of period 84,416 84,416
Equity (excluding STRS JV)    
Fair value measurements    
Fair value, beginning of period 22,846 16,679
Funding of investments   117
Conversions   19,568
Net unrealized appreciation (depreciation) 231 (13,975)
Fair value, end of period 23,077 22,389
Change in unrealized appreciation (depreciation) on investments still held $ 231 $ (13,978)
v3.25.1
FAIR VALUE MEASUREMENTS - Quantitative information (Details)
$ in Thousands
Mar. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 650,999 $ 642,213
First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 516,563 502,693
Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 3,442 8,342
Subordinated unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,202 1,175
Subordinated Notes    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,202 1,175
Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 84,416 84,416
Level 3    
FAIR VALUE MEASUREMENTS    
Investments, fair value 628,700 619,472
Level 3 | First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 516,563 502,693
Level 3 | First lien secured loans | Market Quote    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 9,453
Level 3 | First lien secured loans | Market Quote | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.968
Level 3 | First lien secured loans | Market Quote | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.968
Level 3 | First lien secured loans | Market Quote | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.968
Level 3 | First lien secured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 443,843 $ 439,577
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.076 0.077
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.228 0.268
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.125 0.131
Level 3 | First lien secured loans | Option pricing model    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 53 $ 74
Level 3 | First lien secured loans | Option pricing model | Volatility | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.200 0.160
Level 3 | First lien secured loans | Option pricing model | Volatility | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.200 0.160
Level 3 | First lien secured loans | Option pricing model | Volatility | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.200 0.160
Level 3 | First lien secured loans | Recent transaction    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 37,962 $ 19,554
Level 3 | First lien secured loans | Recent transaction | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.750 98.0
Level 3 | First lien secured loans | Recent transaction | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input | $ / shares 99.5 100.0
Level 3 | First lien secured loans | Recent transaction | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.962 98.5
Level 3 | First lien secured loans | Expected repayment    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 9,104
Level 3 | First lien secured loans | Expected repayment | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   1.030
Level 3 | First lien secured loans | Expected repayment | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   1.030
Level 3 | First lien secured loans | Expected repayment | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   1.030
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 33,104 $ 22,923
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.045 0.058
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.080 0.080
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.066 0.069
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,601 $ 1,635
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.007 0.014
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.007 0.014
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.007 0.014
Level 3 | First lien secured loans | Collateral value    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 373
Level 3 | First lien secured loans | Collateral value | Recovery Rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.000  
Level 3 | First lien secured loans | Collateral value | Recovery Rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.150  
Level 3 | First lien secured loans | Collateral value | Recovery Rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.150  
Level 3 | Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 3,442 8,342
Level 3 | Second lien secured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 3,442 $ 8,342
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.125 0.117
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.125 0.125
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.125 0.120
Level 3 | Subordinated unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,202 $ 1,175
Level 3 | Subordinated unsecured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,202 $ 1,175
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.123 0.123
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.130 0.129
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.127 (0.126)
Level 3 | Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 84,416 $ 84,416
Level 3 | Subordinated Note to STRS JV | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value 84,416 84,416
Level 3 | Preferred Equity | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 3,464 $ 2,916
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.065 0.065
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.100 0.121
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.069 0.075
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 10,378 $ 10,728
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.053 0.053
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.124 0.137
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.096 0.098
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 9,121 $ 9,132
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.007 0.014
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.021 0.020
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.021 0.020
Level 3 | Warrant | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 114 $ 70
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.061 0.055
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.061 0.055
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.061 0.055
v3.25.1
FAIR VALUE MEASUREMENTS - Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Aug. 31, 2023
Aug. 24, 2023
Dec. 06, 2021
Nov. 24, 2021
Dec. 04, 2020
Oct. 20, 2020
5.375% 2025 Notes                
FAIR VALUE MEASUREMENTS                
Interest rate (as a percent) 5.375% 5.375%           5.375%
5.375% 2026 Notes                
FAIR VALUE MEASUREMENTS                
Interest rate (as a percent) 5.375% 5.375%         5.375%  
4.000% 2026 Notes                
FAIR VALUE MEASUREMENTS                
Interest rate (as a percent) 4.00% 4.00%       4.00%    
5.625% 2027 Notes                
FAIR VALUE MEASUREMENTS                
Interest rate (as a percent) 5.625% 5.625%         5.625%  
4.250% 2028 Notes                
FAIR VALUE MEASUREMENTS                
Interest rate (as a percent) 4.25% 4.25%     4.25%      
7.875% 2028 Notes                
FAIR VALUE MEASUREMENTS                
Interest rate (as a percent) 7.875% 7.875% 7.875% 7.875%        
Level 3                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding $ 364,636 $ 355,993            
Fair Value, Debt 358,278 348,576            
Level 3 | JPM Credit Facility                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 170,136 161,493            
Fair Value, Debt 168,547 160,745            
Level 3 | 5.375% 2025 Notes                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 40,000 40,000            
Fair Value, Debt 39,815 39,594            
Level 3 | 5.375% 2026 Notes                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 10,000 10,000            
Fair Value, Debt 9,865 9,765            
Level 3 | 4.000% 2026 Notes                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 75,000 75,000            
Fair Value, Debt 72,319 71,342            
Level 3 | 5.625% 2027 Notes                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 10,000 10,000            
Fair Value, Debt 9,850 9,719            
Level 3 | 4.250% 2028 Notes                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 25,000 25,000            
Fair Value, Debt 23,382 22,911            
Level 3 | 7.875% 2028 Notes                
FAIR VALUE MEASUREMENTS                
Principal Amount Outstanding 34,500 34,500            
Fair Value, Debt $ 34,500 $ 34,500            
v3.25.1
BORROWINGS - Outstanding and Available (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 12, 2023
Feb. 04, 2022
Mar. 31, 2025
Dec. 31, 2024
Aug. 31, 2023
Aug. 24, 2023
Mar. 30, 2022
Mar. 29, 2022
Dec. 06, 2021
Nov. 24, 2021
Dec. 04, 2020
Oct. 20, 2020
Debt Instrument                        
Principal Amount Outstanding     $ 364,636 $ 355,993                
Amortized Cost     361,133 353,117                
Available     164,864 173,507                
JPM Credit Facility                        
Debt Instrument                        
Principal Amount Outstanding     170,136 161,493                
Amortized Cost     168,547 160,745                
Available     $ 164,864 $ 173,507     $ 335,000 $ 310,000        
JPM Credit Facility | SOFR                        
Debt Instrument                        
Variable interest rate (as a percent) 2.25% 2.50% 2.25% 2.50%                
5.375% 2025 Notes                        
Debt Instrument                        
Principal Amount Outstanding     $ 40,000 $ 40,000               $ 40,000
Amortized Cost     $ 39,925 $ 39,892                
Interest rate (as a percent)     5.375% 5.375%               5.375%
5.375% 2026 Notes                        
Debt Instrument                        
Principal Amount Outstanding     $ 10,000 $ 10,000             $ 10,000  
Amortized Cost     $ 9,951 $ 9,943                
Interest rate (as a percent)     5.375% 5.375%             5.375%  
4.000% 2026 Notes                        
Debt Instrument                        
Principal Amount Outstanding     $ 75,000 $ 75,000           $ 75,000    
Amortized Cost     $ 74,417 $ 74,332                
Interest rate (as a percent)     4.00% 4.00%           4.00%    
5.625% 2027 Notes                        
Debt Instrument                        
Principal Amount Outstanding     $ 10,000 $ 10,000             $ 10,000  
Amortized Cost     $ 9,933 $ 9,926                
Interest rate (as a percent)     5.625% 5.625%             5.625%  
4.250% 2028 Notes                        
Debt Instrument                        
Principal Amount Outstanding     $ 25,000 $ 25,000         $ 25,000      
Amortized Cost     $ 24,809 $ 24,796                
Interest rate (as a percent)     4.25% 4.25%         4.25%      
7.875% 2028 Notes                        
Debt Instrument                        
Principal Amount Outstanding     $ 34,500 $ 34,500 $ 34,500 $ 30,000            
Amortized Cost     $ 33,551 $ 33,483                
Interest rate (as a percent)     7.875% 7.875% 7.875% 7.875%            
v3.25.1
BORROWINGS - Narratives (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Apr. 12, 2023
USD ($)
Feb. 04, 2022
Jan. 04, 2022
USD ($)
Aug. 02, 2018
Aug. 01, 2018
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jan. 17, 2025
Mar. 30, 2022
USD ($)
Mar. 29, 2022
USD ($)
Debt Instrument                    
Percentage of asset coverage for borrowed amounts           177.20% 180.40%      
Available           $ 164,864 $ 173,507      
Minimum                    
Debt Instrument                    
Asset coverage ratio       150.00% 150.00%          
Maximum debt-to-equity ratio           1.0        
Value of equity for Each Dollar of Debt           $ 1        
Debt outstanding for each dollar of equity           $ 1        
Maximum                    
Debt Instrument                    
Asset coverage ratio         200.00%          
Maximum debt-to-equity ratio           2.0        
Value of equity for Each Dollar of Debt           $ 2        
Debt outstanding for each dollar of equity           1        
JPM Credit Facility                    
Debt Instrument                    
Temporary Increase in line of credit facility     $ 335,000              
Available           164,864 173,507   $ 335,000 $ 310,000
Minimum funding amount contingent                 234,500 $ 217,000
Interest rate for credit facility               2.25%    
Commitment Fee (as a percent) 0.55%                  
Minimum borrowing capacity $ 234,500                  
Fair value of securities pledged as collateral           521,207        
Principal Amount Outstanding             161,493      
Amount undrawn under the credit facility           164,864 173,507      
Weighted average outstanding borrowings           $ 175,345 $ 183,014      
Interest rate over time           6.62% 7.67%      
Effective interest rate (as a percent)           6.45% 6.88%      
JPM Credit Facility | Maximum                    
Debt Instrument                    
Maximum borrowing limit                 $ 375,000  
JPM Credit Facility | SOFR                    
Debt Instrument                    
Variable interest rate (as a percent) 2.25% 2.50%       2.25% 2.50%      
JPM Credit Facility | Base Rate                    
Debt Instrument                    
Variable interest rate (as a percent) 2.50%                  
JPM Credit Facility | SONIA                    
Debt Instrument                    
Variable interest rate (as a percent) 2.25%                  
v3.25.1
BORROWINGS - Notes (Details) - USD ($)
$ in Thousands
Aug. 31, 2023
Mar. 31, 2025
Dec. 31, 2024
Aug. 24, 2023
Dec. 06, 2021
Nov. 24, 2021
Dec. 04, 2020
Oct. 20, 2020
Debt Instrument                
Principal Amount Outstanding   $ 364,636 $ 355,993          
5.375% 2025 Notes                
Debt Instrument                
Interest rate (as a percent)   5.375% 5.375%         5.375%
Principal Amount Outstanding   $ 40,000 $ 40,000         $ 40,000
5.375% 2025 Notes | Maximum                
Debt Instrument                
Interest rate (as a percent)               6.375%
5.375% 2026 Notes                
Debt Instrument                
Interest rate (as a percent)   5.375% 5.375%       5.375%  
Principal Amount Outstanding   $ 10,000 $ 10,000       $ 10,000  
5.375% 2026 Notes | Maximum                
Debt Instrument                
Interest rate (as a percent)             6.375%  
4.000% 2026 Notes                
Debt Instrument                
Interest rate (as a percent)   4.00% 4.00%     4.00%    
Principal Amount Outstanding   $ 75,000 $ 75,000     $ 75,000    
5.625% 2027 Notes                
Debt Instrument                
Interest rate (as a percent)   5.625% 5.625%       5.625%  
Principal Amount Outstanding   $ 10,000 $ 10,000       $ 10,000  
5.625% 2027 Notes | Maximum                
Debt Instrument                
Interest rate (as a percent)             6.625%  
4.250% 2028 Notes                
Debt Instrument                
Interest rate (as a percent)   4.25% 4.25%   4.25%      
Principal Amount Outstanding   $ 25,000 $ 25,000   $ 25,000      
4.250% 2028 Notes | Maximum                
Debt Instrument                
Interest rate (as a percent)         5.25%      
7.875% 2028 Notes                
Debt Instrument                
Interest rate (as a percent) 7.875% 7.875% 7.875% 7.875%        
Principal Amount Outstanding $ 34,500 $ 34,500 $ 34,500 $ 30,000        
Option to purchase an additional principal amount $ 4,500              
7.875% 2028 Notes | Maximum                
Debt Instrument                
Principal Amount Outstanding       $ 4,500        
v3.25.1
RELATED PARTY TRANSACTIONS - (Details) - Investment Advisory Agreement - item
 3 Months Ended 12 Months Ended
Jan. 01, 2024
Mar. 31, 2025
Dec. 31, 2023
RELATED PARTY TRANSACTIONS      
Agreement may be terminated by either party without penalty upon days   60 days  
Percentage of base management fee on gross assets 1.75%   2.00%
Percentage of base management fee on gross assets if value exceeded total assets 1.25%   1.25%
Threshold percentage for calculation of base management fee 200.00%   200.00%
Number of calendar quarters 2   2
v3.25.1
RELATED PARTY TRANSACTIONS - Base management fee (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
RELATED PARTY TRANSACTIONS      
Base management fees $ 2,833 $ 3,116  
Total management fees 2,833 $ 3,116  
Management fees payable $ 2,833   $ 2,932
v3.25.1
RELATED PARTY TRANSACTIONS - Performance-based incentive fee (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
component
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
RELATED PARTY TRANSACTIONS      
Number of components | component 2    
Incentive fee payables $ 17,977   $ 17,848
Income incentive fee 1,711 $ 2,704  
Total performance-based incentive fees 1,711 $ 2,704  
Capital Gains Incentive Fees under GAAP      
RELATED PARTY TRANSACTIONS      
Incentive fee payables $ 0   $ 0
Investment adviser      
RELATED PARTY TRANSACTIONS      
Number of components | component 2    
Incentive fee payables $ 0    
v3.25.1
RELATED PARTY TRANSACTIONS - Administration , Co-investment and STRS JV (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
RELATED PARTY TRANSACTIONS      
Administrative service fees $ 171 $ 171  
Net realized losses $ (395) (5,615)  
Administration Agreement      
RELATED PARTY TRANSACTIONS      
Agreement may be terminated by either party without penalty upon days 60 days    
Administrative service fees $ 171   $ 171
Administration Agreement | White Horse Advisers      
RELATED PARTY TRANSACTIONS      
Other liabilities 6,253,596   $ 5,890,052
Administration Agreement | STRS JV      
RELATED PARTY TRANSACTIONS      
Proceeds from sale of investments 17,000 8,478  
Net realized losses $ 0 $ 0  
v3.25.1
COMMITMENTS AND CONTINGENCIES - Unfunded commitments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Unfunded commitments    
Total Unfunded Commitments $ 31,914 $ 26,385
Revolving Loan Commitments    
Unfunded commitments    
Total Unfunded Commitments 18,360 15,510
Revolving Loan Commitments | Bridgepoint Healthcare, LLC    
Unfunded commitments    
Total Unfunded Commitments 1,350 1,350
Revolving Loan Commitments | BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)    
Unfunded commitments    
Total Unfunded Commitments 643 459
Revolving Loan Commitments | Claridge Products and Equipment, LLC    
Unfunded commitments    
Total Unfunded Commitments 70 70
Revolving Loan Commitments | Coastal Television Broadcasting Group LLC    
Unfunded commitments    
Total Unfunded Commitments 309 309
Revolving Loan Commitments | EducationDynamics, LLC    
Unfunded commitments    
Total Unfunded Commitments 1,199 1,199
Revolving Loan Commitments | ELM One Call Locators, Inc    
Unfunded commitments    
Total Unfunded Commitments 900  
Revolving Loan Commitments | Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.)    
Unfunded commitments    
Total Unfunded Commitments   194
Revolving Loan Commitments | Impact Advisors, LLC    
Unfunded commitments    
Total Unfunded Commitments 467  
Revolving Loan Commitments | Infotree Holdco LLC [Member]    
Unfunded commitments    
Total Unfunded Commitments 530  
Revolving Loan Commitments | Leviathan Intermediate Holdco, LLC (d/b/a Unleashed Brands Group)    
Unfunded commitments    
Total Unfunded Commitments 418 570
Revolving Loan Commitments | LogicMonitor, Inc.    
Unfunded commitments    
Total Unfunded Commitments 778 778
Revolving Loan Commitments | Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)    
Unfunded commitments    
Total Unfunded Commitments 343 246
Revolving Loan Commitments | M&M OpCo. LLC (d/b/a Escalent, Inc.)    
Unfunded commitments    
Total Unfunded Commitments 238 238
Revolving Loan Commitments | PANOS Brands, LLC    
Unfunded commitments    
Total Unfunded Commitments 329 384
Revolving Loan Commitments | Pavement Partners Interco, LLC    
Unfunded commitments    
Total Unfunded Commitments 7  
Revolving Loan Commitments | Quest Events, LLC [Member]    
Unfunded commitments    
Total Unfunded Commitments 35  
Revolving Loan Commitments | Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)    
Unfunded commitments    
Total Unfunded Commitments 880 880
Revolving Loan Commitments | Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)    
Unfunded commitments    
Total Unfunded Commitments 861 861
Revolving Loan Commitments | SCIC Buyer, Inc [Member]    
Unfunded commitments    
Total Unfunded Commitments 1,625  
Revolving Loan Commitments | Sleep OpCo LLC (d/b/a Brooklyn Bedding LLC)    
Unfunded commitments    
Total Unfunded Commitments 2,646 2,646
Revolving Loan Commitments | Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)    
Unfunded commitments    
Total Unfunded Commitments   146
Revolving Loan Commitments | Telestream Holdings Corporation    
Unfunded commitments    
Total Unfunded Commitments 241 241
Revolving Loan Commitments | The Kyjen Company, LLC (d/b/a Outward Hound)    
Unfunded commitments    
Total Unfunded Commitments 422  
Revolving Loan Commitments | TOT Group, Inc. (d/b/a Netevia Group LLC)    
Unfunded commitments    
Total Unfunded Commitments 553 553
Revolving Loan Commitments | W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)    
Unfunded commitments    
Total Unfunded Commitments 515 515
Revolving Loan Commitments | W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)    
Unfunded commitments    
Total Unfunded Commitments 1,195 1,195
Revolving Loan Commitments | Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,806 1,806
Revolving Loan Commitments | Trailhead Media LLC    
Unfunded commitments    
Total Unfunded Commitments   870
Delayed Draw Loan Commitments    
Unfunded commitments    
Total Unfunded Commitments 13,554 10,875
Delayed Draw Loan Commitments | Impact Advisors, LLC    
Unfunded commitments    
Total Unfunded Commitments 2,333  
Delayed Draw Loan Commitments | Pavement Partners Interco, LLC    
Unfunded commitments    
Total Unfunded Commitments 731  
Delayed Draw Loan Commitments | Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)    
Unfunded commitments    
Total Unfunded Commitments 861 861
Delayed Draw Loan Commitments | SCIC Buyer, Inc [Member]    
Unfunded commitments    
Total Unfunded Commitments 1,920  
Delayed Draw Loan Commitments | Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)    
Unfunded commitments    
Total Unfunded Commitments 878 878
Delayed Draw Loan Commitments | TOT Group, Inc. (d/b/a Netevia Group LLC)    
Unfunded commitments    
Total Unfunded Commitments 553 1,107
Delayed Draw Loan Commitments | W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,288 1,288
Delayed Draw Loan Commitments | Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,422 1,422
Delayed Draw Loan Commitments | Avision Holdings, LLC (d/b/a Avision Sales Group)    
Unfunded commitments    
Total Unfunded Commitments 1,756 1,756
Delayed Draw Loan Commitments | Camarillo Fitness Holdings, LLC [Member]    
Unfunded commitments    
Total Unfunded Commitments 818  
Delayed Draw Loan Commitments | Trailhead Media LLC    
Unfunded commitments    
Total Unfunded Commitments   2,174
Delayed Draw Loan Commitments | Kelso Industries LLC    
Unfunded commitments    
Total Unfunded Commitments $ 994 $ 1,389
v3.25.1
COMMITMENTS AND CONTINGENCIES - Additional information (Details) - STRS JV - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Unfunded commitments    
Commitments to fund equity interests $ 23,000 $ 23,000
Commitments to fund subordinated notes 92,000 92,000
Unfunded equity interests 1,896 1,896
Unfunded subordinated notes $ 7,584 $ 7,584
v3.25.1
STOCKHOLDERS' EQUITY (Details) - ATM Program - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Subsidiary, Sale of Stock      
Stock issued in connection with offering (in shares) 0 0  
B. Riley Securities, Inc. | Maximum      
Subsidiary, Sale of Stock      
Aggregate offering amount     $ 35,000
v3.25.1
FINANCIAL HIGHLIGHTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Per share data:    
Net asset value, beginning of period $ 12.31 $ 13.63
Investment operations:    
Net investment income 0.29 0.47
Net realized and unrealized gains (losses) on investments and foreign currency transactions (0.10) (0.21)
Net increase in net assets resulting from operations 0.19 0.26
Distributions declared from net investment income (0.39) (0.39)
Net asset value, end of period $ 12.11 $ 13.50
Total annualized return based on market value (1.26%) 3.26%
Total annualized return based on net asset value 6.02% 7.50%
Net assets, end of period $ 281,449 $ 313,792
Per share market value at end of period $ 9.65 $ 12.40
Shares outstanding end of period 23,243,088 23,243,088
Ratios/Supplemental Data:    
Ratio of expenses before incentive fees to average net assets 14.47% 15.03%
Ratio of incentive fees to average net assets 2.42% 3.40%
Ratio of total expenses to average net assets 16.89% 18.43%
Ratio of net investment income to average net assets 9.66% 13.60%
Portfolio turnover ratio 5.80% 7.87%
v3.25.1
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE    
Net increase (decrease) in net assets resulting from operations $ 4,264 $ 5,969
Weighted average shares outstanding, basic 23,243,088 23,243,088
Weighted average shares outstanding, diluted 23,243,088 23,243,088
Basic per share net increase (decrease) in net assets resulting from operations $ 0.18 $ 0.26
Diluted per share net increase (decrease) in net assets resulting from operations $ 0.18 $ 0.26