WHITEHORSE FINANCE, INC., 10-K/A filed on 6/10/2025
Amended Annual Report
v3.25.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Document Fiscal Year Focus 2024    
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, 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 Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 224.2
Entity Common Stock, Shares Outstanding   23,243,088  
Entity Central Index Key 0001552198    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Crowe LLP    
Auditor Location Costa Mesa, California    
Auditor Firm ID 173    
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
Dec. 31, 2024
Dec. 31, 2023
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) $ 642,213 $ 696,168
Cash and cash equivalents 12,424 10,749
Restricted cash and cash equivalents 14,548 12,527
Restricted foreign currency (cost of $297 and $894, respectively) 864 1,211
Interest and dividend receivable 5,631 8,149
Amounts receivable on unsettled investment transactions 112 343
Escrow receivable   393
Prepaid expenses and other receivables 1,009 1,211
Unrealized appreciation on foreign currency forward contracts 20  
Total assets 676,821 730,751
Liabilities    
Debt (net of unamortized debt issuance costs of $3,503 and $2,876, respectively) 353,117 386,448
Distributions payable 8,949 8,949
Management fees payable 2,932 3,595
Incentive fees payable 17,848 10,470
Amounts payable on unsettled investment transactions 3,539  
Interest payable 1,821 2,069
Accounts payable and accrued expenses 2,141 2,089
Advances received from unfunded credit facilities 340 316
Unrealized depreciation on foreign currency forward contracts   43
Total liabilities 390,687 413,979
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 337,205 338,275
Accumulated earnings (losses) (51,094) (21,526)
Total net assets 286,134 316,772
Total liabilities and total net assets $ 676,821 $ 730,751
Number of shares outstanding 23,243,088 23,243,088
Net asset value per share $ 12.31 $ 13.63
Non-controlled/non-affiliate company investments    
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) $ 504,832 $ 577,798
Non-controlled affiliate company investments    
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) 29,851 5,422
Controlled affiliate company investments    
Assets    
Total investments, at fair value (amortized cost $706,224 and $695,240, respectively) $ 107,530 $ 112,948
v3.25.1
Consolidated Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Consolidated Statements of Assets and Liabilities    
Investments, amortized cost $ 695,240 $ 740,021
Restricted foreign currency, cost 894 1,231
Unamortized debt issuance costs $ 2,876 $ 4,564
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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investment income      
Total investment income $ 92,817 $ 103,260 $ 87,527
Expenses      
Interest expense 27,899 29,915 21,940
Base management fees 12,127 14,684 15,600
Performance-based incentive fees 9,309 10,678 7,059
Administrative service fees 683 683 683
General and administrative expenses 4,440 3,622 3,963
Total expenses 54,458 59,582 49,245
Net investment income before excise tax 38,359 43,678 38,282
Excise tax 1,121 965 1,024
Net investment income after excise tax 37,238 42,713 37,258
Realized and unrealized gains (losses) on investments and foreign currency transactions      
Net realized gains (losses) (17,993) (30) (13,958)
Foreign currency transactions (1) 950 (310)
Foreign currency forward contracts 13 27  
Net realized gains (losses) (17,981) 947 (14,268)
Net change in unrealized appreciation (depreciation) (9,567) (21,969) (9,191)
Translation of assets and liabilities in foreign currencies 1,098 (1,239) 1,887
Foreign currency forward contracts 63 (40) (3)
Net change in unrealized appreciation (depreciation) (8,406) (23,248) (7,307)
Net realized and unrealized gains (losses) on investments and foreign currency transactions (26,387) (22,301) (21,575)
Net increase (decrease) in net assets resulting from operations $ 10,851 $ 20,412 $ 15,683
Per Common Share Data      
Basic earnings (losses) per common share $ 0.47 $ 0.88 $ 0.68
Diluted earnings (losses) per common share 0.47 0.88 0.68
Dividends and distributions declared per common share $ 1.79 $ 1.55 $ 1.47
Basic weighted average common shares outstanding 23,243,088 23,243,088 23,229,552
Diluted weighted average common shares outstanding 23,243,088 23,243,088 23,229,552
Non-controlled/non-affiliate company investments      
Investment income      
Interest income $ 66,402 $ 78,493 $ 67,617
Payment-in-kind income 6,175 3,960 2,114
Fee income 2,247 2,966 3,474
Dividend income 116 450 300
Realized and unrealized gains (losses) on investments and foreign currency transactions      
Net realized gains (losses) (17,993) 309 (15,683)
Net change in unrealized appreciation (depreciation) 7,421 (7,871) (3,505)
Non-controlled affiliate company investments      
Investment income      
Interest income 93   13
Payment-in-kind income 705 314 326
Dividend income   84 321
Realized and unrealized gains (losses) on investments and foreign currency transactions      
Net realized gains (losses)   (339) 1,725
Net change in unrealized appreciation (depreciation) (7,775) (5,608) (5,239)
Controlled affiliate company investments      
Investment income      
Interest income 9,838 9,488 6,385
Payment-in-kind income 380 1,347  
Dividend income 6,861 6,158 6,977
Realized and unrealized gains (losses) on investments and foreign currency transactions      
Net change in unrealized appreciation (depreciation) $ (9,213) $ (8,490) $ (447)
v3.25.1
Consolidated Statements of Changes in Net Assets (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity      
Beginning Balance $ 316,772 $ 332,387 $ 349,751
Beginning Balance (in shares) 23,243,088    
Stock issued in connection with dividend reinvestment plan     978
Net increase in net assets resulting from operations:      
Net investment income after excise tax $ 37,238 42,713 37,258
Net realized gains (losses) on investments and foreign currency transactions (17,981) 947 (14,268)
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions (8,406) (23,248) (7,307)
Distributions declared (41,489) (36,027) (34,150)
Ending Balance $ 286,134 $ 316,772 332,387
Ending Balance (in shares) 23,243,088 23,243,088  
At-the-market offering      
Increase (Decrease) in Stockholders' Equity      
Stock issued in connection with offering (in shares) 0 0  
Stock issued in connection with offering     125
Common Stock      
Increase (Decrease) in Stockholders' Equity      
Beginning Balance $ 23 $ 23 $ 23
Beginning Balance (in shares) 23,243,088 23,243,088 23,162,667
Stock issued in connection with dividend reinvestment plan (in shares)     63,743
Net increase in net assets resulting from operations:      
Ending Balance $ 23 $ 23 $ 23
Ending Balance (in shares) 23,243,088 23,243,088 23,243,088
Common Stock | At-the-market offering      
Increase (Decrease) in Stockholders' Equity      
Stock issued in connection with offering (in shares)     16,678
Paid-in Capital in Excess of Par      
Increase (Decrease) in Stockholders' Equity      
Beginning Balance $ 338,275 $ 339,240 $ 339,161
Stock issued in connection with dividend reinvestment plan     978
Net increase in net assets resulting from operations:      
Tax reclassification of stockholders' equity (1,070) (965) (1,024)
Ending Balance 337,205 338,275 339,240
Paid-in Capital in Excess of Par | At-the-market offering      
Increase (Decrease) in Stockholders' Equity      
Stock issued in connection with offering     125
Accumulated Earnings (Losses)      
Increase (Decrease) in Stockholders' Equity      
Beginning Balance (21,526) (6,876) 10,567
Net increase in net assets resulting from operations:      
Net investment income after excise tax 37,238 42,713 37,258
Net realized gains (losses) on investments and foreign currency transactions (17,981) 947 (14,268)
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions (8,406) (23,248) (7,307)
Distributions declared (41,489) (36,027) (34,150)
Tax reclassification of stockholders' equity 1,070 965 1,024
Ending Balance $ (51,094) $ (21,526) $ (6,876)
v3.25.1
Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities      
Net increase in net assets resulting from operations $ 10,851 $ 20,412 $ 15,683
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 (7,260) (5,738) (2,355)
Net realized (gains) losses on investments 17,993 30 13,958
Net unrealized (appreciation) depreciation on investments 9,567 21,969 9,191
Net unrealized (appreciation) depreciation on translation of assets and liabilities in foreign currencies (1,098) 1,239 (1,887)
Net unrealized (appreciation) depreciation on foreign currency forward contracts (63) 40 3
Accretion of discount (4,111) (4,493) (5,626)
Amortization of deferred financing costs 1,688 1,599 1,541
Acquisition of investments (207,283) (145,008) (280,089)
Proceeds from principal payments and sales of portfolio investments 186,251 128,199 239,622
Proceeds from sales of portfolio investments to STRS JV 59,190 69,419 83,459
Net changes in operating assets and liabilities:      
Interest and dividend receivable 2,518 (335) (293)
Escrow receivable     619
Prepaid expenses and other receivables 202 (37) 133
Amounts receivable on unsettled investment transactions 231 (60) (283)
Amounts payable on unsettled investment transactions 3,539    
Management fees payable (663) (265) 94
Incentive fees payable 7,378 4,852 (2,340)
Accounts payable and accrued expenses 52 (240) (109)
Interest payable (248) (705) 687
Advances received from unfunded credit facilities 24 (509) (14)
Net cash (used in) / provided by operating activities 78,758 90,369 71,994
Cash flows from financing activities      
Proceeds from notes issued   34,500  
Proceeds from issuance of common stock, net of offering costs     125
Borrowings 119,315 132,248 140,527
Repayments of debt (153,222) (222,099) (175,417)
Deferred financing costs   (1,445) (580)
Distributions paid to common stockholders, net of distributions reinvested (41,489) (35,329) (33,143)
Net cash provided by / (used in) financing activities (75,396) (92,125) (68,488)
Effect of exchange rate changes on cash (13) (21) 290
Net change in cash, cash equivalents and restricted cash 3,349 (1,777) 3,796
Cash, cash equivalents and restricted cash at beginning of period 24,487 26,264 22,468
Cash, cash equivalents and restricted cash at end of period 27,836 24,487 26,264
Supplemental and non-cash disclosure of cash flow information:      
Interest paid 26,459 29,021 19,712
Taxes, including excise tax, paid during the year $ 1,407 1,103 1,184
Distributions reinvested     978
Non-cash exchanges of investments   $ 5,520 $ 25,000
v3.25.1
Consolidated Statements of Cash Flows (Unaudited) - Total cash, cash equivalents and restricted cash - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of cash, cash equivalents      
Cash and cash equivalents $ 12,424 $ 10,749 $ 9,508
Restricted cash and cash equivalents 14,548 12,527 14,683
Restricted foreign currency 864 1,211 2,073
Total cash and cash equivalents, restricted cash and cash equivalents and restricted foreign currency presented in consolidated statements of cash flows $ 27,836 $ 24,487 $ 26,264
v3.25.1
Consolidated Schedule of Investments
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]              
Investments, amortized cost $ 695,240,000 $ 740,021,000          
Investments, fair value $ 642,213,000 $ 696,168,000          
Percent of net assets 224.40% 219.70% 224.40% 219.70%      
Total investments and money market funds amortized cost $ 708,489,000            
Total investments and money market funds fair value $ 655,462,000            
Total investments and money market funds percentage 229.00%   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 80.70% 83.30%          
Investments of net assets 224.40% 219.70%          
Investment Of total assets 94.90% 95.30%          
Unrealized appreciation $ 20,000            
Unrealized depreciation   $ (43,000)          
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            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 0.75%   0.75%        
Spread Above Index 5.25%   5.25%        
Interest Rate 9.78%   9.78%        
Acquisition Date Sep. 19, 2024            
Maturity Date Jul. 02, 2031   Jul. 02, 2031        
Principal/Share Amount $ 78,000            
Investments, amortized cost 78,000            
Investments, fair value $ 80,000            
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:AbCentersAcquisitionCorporationMember            
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 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]        
Floor 0.75%   0.75%        
Spread Above Index 5.25%   5.25%        
Interest Rate 9.78%   9.78%        
Acquisition Date Sep. 19, 2024            
Maturity Date Jul. 02, 2031   Jul. 02, 2031        
Investments, fair value $ 5,000            
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:AbCentersAcquisitionCorporationMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 0.75%   0.75%        
Spread Above Index 5.25%   5.25%        
Interest Rate 9.79%   9.79%        
Acquisition Date Sep. 19, 2024            
Maturity Date Jul. 02, 2031   Jul. 02, 2031        
Principal/Share Amount $ 7,962,000            
Investments, amortized cost 7,866,000            
Investments, fair value $ 7,919,000            
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:ABBCon-ciseOpticalGroupLLCMember whfcl:ABBCon-ciseOpticalGroupLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 7.50% 7.50% 7.50% 7.50%      
Interest Rate 11.98% 13.01% 11.98% 13.01%      
Acquisition Date Feb. 23, 2022 Feb. 23, 2022          
Maturity Date Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028      
Principal/Share Amount $ 20,409,000 $ 20,409,000          
Investments, amortized cost 20,142,000 20,056,000          
Investments, fair value $ 19,535,000 $ 18,983,000          
Percent of net assets 6.80% 6.00% 6.80% 6.00%      
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]: ALM 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]   whfcl:ALMMediaLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Data Processing & Outsourced Services   Data Processing & Outsourced Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   11.50%   11.50%      
Acquisition Date   Nov. 25, 2019          
Maturity Date   Nov. 25, 2024   Nov. 25, 2024      
Principal/Share Amount   $ 12,600,000          
Investments, amortized cost   12,555,000          
Investments, fair value   $ 12,517,000          
Percent of net assets   4.00%   4.00%      
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]: APG Lions Purchaser, LLC, First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:ApgLionsPurchaserLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.40%   10.40%        
Acquisition Date Apr. 26, 2024            
Maturity Date Apr. 16, 2030   Apr. 16, 2030        
Investments, fair value $ 15,000            
Investment, Identifier [Axis]: APG Lions Purchaser, LLC, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:ApgLionsPurchaserLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.40%   10.40%        
Acquisition Date Apr. 26, 2024            
Maturity Date Apr. 16, 2030   Apr. 16, 2030        
Investments, fair value $ 6,000            
Investment, Identifier [Axis]: APG Lions Purchaser, LLC, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:ApgLionsPurchaserLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.40%   10.40%        
Acquisition Date Apr. 26, 2024            
Maturity Date Apr. 16, 2030   Apr. 16, 2030        
Principal/Share Amount $ 4,080,000            
Investments, amortized cost 4,027,000            
Investments, fair value $ 4,070,000            
Investment, Identifier [Axis]: ATSG, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ATSGIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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      
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   6.50%   6.50%      
Interest Rate   12.04%   12.04%      
Acquisition Date   Mar. 27, 2023          
Maturity Date   Nov. 12, 2026   Nov. 12, 2026      
Principal/Share Amount   $ 9,873,000          
Investments, amortized cost   9,678,000          
Investments, fair value   $ 9,771,000          
Investment, Identifier [Axis]: ATSG, 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:ATSGIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   12.04%   12.04%      
Acquisition Date   Nov. 12, 2021          
Maturity Date   Nov. 12, 2026   Nov. 12, 2026      
Principal/Share Amount   $ 3,785,000          
Investments, amortized cost   3,741,000          
Investments, fair value   $ 3,745,000          
Percent of net assets   1.20%   1.20%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:AlvariaHoldcoMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 0.75%   0.75%        
Spread Above Index 7.50%   7.50%        
Interest Rate 11.96%   11.96%        
Cash interest rate 5.46%   5.46%        
PIK interest rate 6.50%   6.50%        
Acquisition Date Mar. 20, 2024            
Maturity Date May 08, 2028   May 08, 2028        
Principal/Share Amount $ 1,782,000            
Investments, amortized cost 1,615,000            
Investments, fair value $ 1,456,000            
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] 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:AlvariaHoldcoMember            
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 0.75%   0.75%        
Spread Above Index 7.00%   7.00%        
Interest Rate 11.46%   11.46%        
Acquisition Date Mar. 20, 2024            
Maturity Date May 08, 2028   May 08, 2028        
Principal/Share Amount $ 2,400,000            
Investments, amortized cost 2,330,000            
Investments, fair value $ 74,000            
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:AlvariaHoldcoMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 0.75%   0.75%        
Spread Above Index 7.00%   7.00%        
Interest Rate 11.46%   11.46%        
Acquisition Date Mar. 20, 2024            
Maturity Date May 08, 2028   May 08, 2028        
Principal/Share Amount $ 9,600,000            
Investments, amortized cost 9,318,000            
Investments, fair value $ 3,990,000            
Percent of net assets 1.40%   1.40%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:AlvariaHoldcoMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 0.75%   0.75%        
Spread Above Index 7.50%   7.50%        
Interest Rate 11.96%   11.96%        
Cash interest rate 6.46%   6.46%        
PIK interest rate 5.50%   5.50%        
Acquisition Date Mar. 20, 2024            
Maturity Date May 08, 2028   May 08, 2028        
Principal/Share Amount $ 1,178,000            
Investments, amortized cost 1,029,000            
Investments, fair value $ 451,000            
Percent of net assets 0.20%   0.20%        
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]: 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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsHoldingsLlcMember whfcl:AmericanCraftsHoldingsLlcMember          
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [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 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      
Investment, Significant Unobservable Input [true false] true true true true      
Investment, Non-income Producing [true false] false false false false      
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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember whfcl:AmericanCraftsLCMember          
Investment, Type [Extensible Enumeration] whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember      
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, 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 8.50% 8.50% 8.50% 8.50%      
PIK interest rate 12.96% 13.96% 12.96% 13.96%      
Acquisition Date Jul. 25, 2023 Jul. 25, 2023          
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026      
Principal/Share Amount $ 2,191,000 $ 1,903,000          
Investments, amortized cost $ 2,094,000 1,903,000          
Investments, fair value   $ 1,878,000          
Percent of net assets   0.60%   0.60%      
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]: 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      
Investments, fair value   $ 1,878,000          
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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember whfcl:AmericanCraftsLCMember          
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 Products Leisure Products Leisure Products Leisure 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 8.50% 8.50% 8.50% 8.50%      
PIK interest rate 12.96% 13.96% 12.96% 13.96%      
Acquisition Date Jan. 25, 2022 Jan. 25, 2022          
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026      
Principal/Share Amount $ 1,823,000 $ 1,585,000          
Investments, amortized cost $ 1,458,000 1,458,000          
Investments, fair value   $ 93,000          
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]: 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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember whfcl:AmericanCraftsLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [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, 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 8.50% 8.50% 8.50% 8.50%      
PIK interest rate 12.96% 13.96% 12.96% 13.96%      
Acquisition Date May 28, 2021 May 28, 2021          
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026      
Principal/Share Amount $ 10,859,000 $ 9,441,000          
Investments, amortized cost $ 8,720,000 8,720,000          
Investments, fair value   $ 553,000          
Percent of net assets   0.20%   0.20%      
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]: 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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember whfcl:AmericanCraftsLCMember          
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember      
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, 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 8.50% 8.50% 8.50% 8.50%      
PIK interest rate 12.96% 13.96% 12.96% 13.96%      
Acquisition Date Dec. 22, 2022 Dec. 22, 2022          
Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026      
Principal/Share Amount $ 5,876,000 $ 5,105,000          
Investments, amortized cost $ 5,105,000 5,105,000          
Investments, fair value   $ 3,226,000          
Percent of net assets   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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember            
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.50%   8.50%        
Acquisition Date May 02, 2024            
Maturity Date May 28, 2026   May 28, 2026        
Principal/Share Amount $ 2,485,000            
Investments, amortized cost 2,374,000            
Investments, fair value $ 373,000            
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] 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember            
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.50%   8.50%        
PIK interest rate 12.96%   12.96%        
Acquisition Date Jan. 31, 2024            
Maturity Date May 28, 2026   May 28, 2026        
Principal/Share Amount $ 1,287,000            
Investments, amortized cost $ 1,230,000            
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]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan one              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:AmericanCraftsLCMember            
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember        
Investment, Identifier [Axis]: Arcole Holding Corporation              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcoleHoldingCorporationMember          
Investment, Identifier [Axis]: Arcole Holding Corporation, Equity              
Schedule of Investments [Line Items]              
Investment, Type [Extensible Enumeration]   Equity Investments   Equity Investments      
Investments, fair value             $ 6,380,000
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanGpLlcMember            
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software        
Acquisition Date Jan. 03, 2024            
Investment owned shares | shares 663   663        
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]: 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            
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember        
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        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanOpcoLpMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.00%   8.00%        
PIK interest rate 12.67%   12.67%        
Acquisition Date Jan. 03, 2024            
Maturity Date Jan. 04, 2027   Jan. 04, 2027        
Principal/Share Amount $ 689,000            
Investments, amortized cost 677,000            
Investments, fair value $ 1,247,000            
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] 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanOpcoLpMember            
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember   whfcl:UnsecuredLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software        
Interest Rate 9.00%   9.00%        
PIK interest rate 9.00%   9.00%        
Acquisition Date Jan. 03, 2024            
Maturity Date Jul. 02, 2029   Jul. 02, 2029        
Principal/Share Amount $ 581,000            
Investments, amortized cost 569,000            
Investments, fair value $ 581,000            
Percent of net assets 0.20%   0.20%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanOpcoLpMember            
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember   whfcl:UnsecuredLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software        
Interest Rate 9.00%   9.00%        
Acquisition Date Jan. 03, 2024            
Maturity Date Jul. 02, 2029   Jul. 02, 2029        
Principal/Share Amount $ 594,000            
Investments, amortized cost 583,000            
Investments, fair value $ 594,000            
Percent of net assets 0.20%   0.20%        
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]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments        
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanTopcoLpMember            
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software        
Acquisition Date Jan. 03, 2024            
Investment owned shares | shares 663   663        
Investments, amortized cost $ 19,568,000            
Investments, fair value $ 9,131,000            
Percent of net assets 3.20%   3.20%        
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]: 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            
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember        
Investments, fair value $ 9,131,000            
Investment, Identifier [Axis]: Arcstor Midco, LLC (d/b/a Arcserve (USA), 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:ArcstorMidcoLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.75%   7.75%      
PIK interest rate   13.21%   13.21%      
Acquisition Date   Mar. 16, 2021          
Maturity Date   Mar. 16, 2027   Mar. 16, 2027      
Principal/Share Amount   $ 21,613,000          
Investments, amortized cost   19,568,000          
Investments, fair value   $ 10,477,000          
Percent of net assets   3.30%   3.30%      
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]: Arcstor Midco, LLC (d/b/a Arcserve (USA), LLC Priority 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]   whfcl:ArcstorMidcoLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:PriorityFirstLienSecuredDelayedDrawLoanMember   whfcl:PriorityFirstLienSecuredDelayedDrawLoanMember      
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Spread Above Index   8.00%   8.00%      
PIK interest rate   13.46%   13.46%      
Acquisition Date   Jul. 14, 2023          
Maturity Date   Mar. 16, 2027   Mar. 16, 2027      
Principal/Share Amount   $ 1,078,000          
Investments, amortized cost   1,050,000          
Investments, fair value   $ 1,046,000          
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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% 6.25% 5.00% 6.25%      
Interest Rate 9.33% 11.60% 9.33% 11.60%      
Acquisition Date Oct. 25, 2023 Oct. 25, 2023          
Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028      
Investments, fair value $ 9,000            
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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% 6.25% 5.00% 6.25%      
Interest Rate 9.33% 11.60% 9.33% 11.60%      
Acquisition Date Oct. 25, 2023 Oct. 25, 2023          
Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028      
Principal/Share Amount $ 4,972,000 $ 5,022,000          
Investments, amortized cost 4,877,000 4,901,000          
Investments, fair value $ 5,021,000 $ 4,901,000          
Investment, Identifier [Axis]: Atlas Purchaser, 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:AtlasPurchaserIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Application Software   Application Software      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   0.75%   0.75%      
Spread Above Index   5.25%   5.25%      
Interest Rate   10.88%   10.88%      
Acquisition Date   Aug. 29, 2022          
Maturity Date   May 08, 2028   May 08, 2028      
Principal/Share Amount   $ 3,066,000          
Investments, amortized cost   2,675,000          
Investments, fair value   $ 2,269,000          
Percent of net assets   0.70%   0.70%      
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]: Atlas Purchaser, 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:AtlasPurchaserIncMember          
Investment, Type [Extensible Enumeration]   whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Application Software   Application Software      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   0.75%   0.75%      
Spread Above Index   9.00%   9.00%      
Interest Rate   14.64%   14.64%      
Acquisition Date   May 03, 2021          
Maturity Date   May 07, 2029   May 07, 2029      
Principal/Share Amount   $ 15,000,000          
Investments, amortized cost   14,699,000          
Investments, fair value   $ 9,744,000          
Percent of net assets   3.10%   3.10%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Avision Holdings, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.48%   10.48%        
Acquisition Date May 31, 2024            
Maturity Date Dec. 15, 2026   Dec. 15, 2026        
Principal/Share Amount $ 553,000            
Investments, amortized cost 545,000            
Investments, fair value $ 558,000            
Percent of net assets 0.20%   0.20%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Avision Holdings, LLC [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.48%   10.48%        
Acquisition Date May 31, 2024            
Maturity Date Dec. 15, 2026   Dec. 15, 2026        
Principal/Share Amount $ 658,000            
Investments, amortized cost 648,000            
Investments, fair value $ 652,000            
Percent of net assets 0.20%   0.20%        
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]: 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      
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      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising      
Acquisition Date Dec. 15, 2021 Dec. 15, 2021          
Investment owned shares | shares 200 200 200 200      
Investments, amortized cost $ 287,000 $ 287,000          
Investments, fair value $ 577,000 $ 411,000          
Percent of net assets 0.20% 0.10% 0.20% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:BBQBuyerLLCMember whfcl:BBQBuyerLLCMember          
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] Household Appliances Household Appliances Household Appliances Household Appliances      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.50% 1.50% 1.50% 1.50%      
Spread Above Index 10.50% 9.50% 10.50% 9.50%      
Interest Rate 14.96% 14.96% 14.96% 14.96%      
Cash interest rate 12.96% 13.96% 12.96% 13.96%      
PIK interest rate 2.00% 1.00% 2.00% 1.00%      
Acquisition Date Dec. 02, 2021 Dec. 02, 2021          
Maturity Date Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025      
Principal/Share Amount $ 2,654,000 $ 2,628,000          
Investments, amortized cost 2,645,000 2,606,000          
Investments, fair value $ 2,642,000 $ 2,613,000          
Percent of net assets 0.90% 0.80% 0.90% 0.80%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:BBQBuyerLLCMember whfcl:BBQBuyerLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.50% 1.50% 1.50% 1.50%      
Spread Above Index 10.50% 9.50% 10.50% 9.50%      
Interest Rate 14.96% 14.96% 14.96% 14.96%      
Cash interest rate 12.96% 13.96% 12.96% 13.96%      
PIK interest rate 2.00% 1.00% 2.00% 1.00%      
Acquisition Date Aug. 28, 2020 Aug. 28, 2020          
Maturity Date Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025 Aug. 28, 2025      
Principal/Share Amount $ 13,013,000 $ 12,891,000          
Investments, amortized cost 12,972,000 12,787,000          
Investments, fair value $ 12,955,000 $ 12,818,000          
Percent of net assets 4.50% 4.10% 4.50% 4.10%      
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]: 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      
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]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances      
Acquisition Date Aug. 28, 2020 Aug. 28, 2020          
Investment owned shares | shares 1,100 1,100 1,100 1,100      
Investments, amortized cost $ 1,100,000 $ 1,100,000          
Investments, fair value $ 907,000 $ 1,330,000          
Percent of net assets 0.30% 0.40% 0.30% 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]: 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 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 Feb. 01, 2022          
Investment owned shares | shares 733 733 733 733      
Investments, amortized cost $ 788,000 $ 788,000          
Investments, fair value $ 1,012,000 $ 1,053,000          
Percent of net assets 0.40% 0.30% 0.40% 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]: 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 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 Dec. 29, 2021          
Investment owned shares | shares 90 83 90 83      
Investments, amortized cost $ 942,000 $ 825,000          
Investments, fair value $ 1,400,000 $ 983,000          
Percent of net assets 0.50% 0.30% 0.50% 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]: 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        
Investment, Issuer Name [Extensible Enumeration] Busa Acquisition Co BankCard Usa Merchant Services 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] Data Processing & Outsourced Services   Data Processing & Outsourced Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.81%   10.81%        
Acquisition Date Apr. 04, 2024            
Maturity Date Mar. 30, 2029   Mar. 30, 2029        
Principal/Share Amount $ 459,000            
Investments, amortized cost 447,000            
Investments, fair value $ 461,000            
Percent of net assets 0.20%   0.20%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Busa Acquisition Co BankCard Usa Merchant Services Inc [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services   Data Processing & Outsourced Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.77%   10.77%        
Acquisition Date Apr. 04, 2024            
Maturity Date Mar. 30, 2029   Mar. 30, 2029        
Principal/Share Amount $ 7,779,000            
Investments, amortized cost 7,580,000            
Investments, fair value $ 7,691,000            
Percent of net assets 2.70%   2.70%        
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]: Banner Acquisition Holdings, LLC (d/b/a Banner Industries, 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerIndustriesIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Construction & Engineering   Construction & Engineering      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   11.38%   11.38%      
Acquisition Date   Dec. 01, 2023          
Maturity Date   Jan. 02, 2029   Jan. 02, 2029      
Principal/Share Amount   $ 140,000          
Investments, amortized cost   137,000          
Investments, fair value   $ 137,000          
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]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] Banner Acquisition Holdings, LLC [Member] Banner Acquisition 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] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.25% 6.00% 6.25% 6.00%      
Interest Rate 10.59% 11.38% 10.59% 11.38%      
Acquisition Date Dec. 21, 2023 Dec. 21, 2023          
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029      
Principal/Share Amount $ 1,502,000 $ 1,400,000          
Investments, amortized cost 1,472,000 1,366,000          
Investments, fair value $ 1,477,000 $ 1,365,000          
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] Banner Acquisition Holdings, LLC [Member] Banner Acquisition Holdings, 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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.00% 6.25% 6.00%      
Interest Rate 10.61% 11.37% 10.61% 11.37%      
Acquisition Date Dec. 21, 2023 Dec. 21, 2023          
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029      
Principal/Share Amount $ 420,000 $ 196,000          
Investments, amortized cost 412,000 191,000          
Investments, fair value $ 415,000 $ 191,000          
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] Banner Acquisition Holdings, LLC [Member] Banner Acquisition Holdings, LLC [Member]          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.00% 6.25% 6.00%      
Interest Rate 10.61% 11.38% 10.61% 11.38%      
Acquisition Date Dec. 21, 2023 Dec. 21, 2023          
Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029      
Principal/Share Amount $ 3,033,000 $ 3,091,000          
Investments, amortized cost 2,974,000 3,015,000          
Investments, fair value $ 2,981,000 $ 3,015,000          
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, 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      
Investment, Issuer Name [Extensible Enumeration] Barrett Purchaser LLC [Member] Barrett Purchaser 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] 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] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 0.75% 0.75% 0.75% 0.75%      
Spread Above Index 6.00% 6.00% 6.00% 6.00%      
Interest Rate 10.51% 11.36% 10.51% 11.36%      
Acquisition Date Jan. 10, 2024 Nov. 21, 2023          
Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029      
Investments, fair value $ (2,000)            
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]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, 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] Barrett Purchaser LLC [Member] Barrett Purchaser 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] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember whfcl:SecuredOvernightFinancingRateSofrMember us-gaap:PrimeRateMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 0.75% 0.75% 0.75% 0.75%      
Spread Above Index 5.00% 6.00% 5.00% 6.00%      
Interest Rate 12.50% 11.36% 12.50% 11.36%      
Acquisition Date Jan. 10, 2024 Nov. 21, 2023          
Maturity Date Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028      
Principal/Share Amount $ 60,000            
Investments, amortized cost 58,000            
Investments, fair value $ 63,000            
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]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, 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] Barrett Purchaser LLC [Member] Barrett Purchaser LLC [Member]          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 0.75% 0.75% 0.75% 0.75%      
Spread Above Index 6.00% 6.00% 6.00% 6.00%      
Interest Rate 10.51% 11.36% 10.51% 11.36%      
Acquisition Date Jan. 10, 2024 Nov. 21, 2023          
Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029      
Principal/Share Amount $ 3,617,000 $ 3,654,000          
Investments, amortized cost 3,543,000 3,564,000          
Investments, fair value $ 3,574,000 $ 3,564,000          
Percent of net assets   1.10%   1.10%      
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]: 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            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.94%   9.94%        
Acquisition Date Sep. 13, 2024            
Maturity Date Dec. 05, 2028   Dec. 05, 2028        
Investments, fair value $ 7,000            
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            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.94%   9.94%        
Acquisition Date Sep. 13, 2024            
Maturity Date Dec. 05, 2028   Dec. 05, 2028        
Principal/Share Amount $ 3,681,000            
Investments, amortized cost 3,633,000            
Investments, fair value $ 3,675,000            
Investment, Identifier [Axis]: Branford Filtration, LLC (d/b/a Clean Solutions Group) 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]   Branford Filtration, LLC [Member]          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services   Environmental & Facilities Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   Nov. 17, 2023          
Maturity Date   Nov. 17, 2028   Nov. 17, 2028      
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]: Branford Filtration, LLC (d/b/a Clean Solutions 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      
Investment, Issuer Name [Extensible Enumeration]   Branford Filtration, LLC [Member]          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services   Environmental & Facilities Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   Nov. 17, 2023          
Maturity Date   Nov. 17, 2028   Nov. 17, 2028      
Principal/Share Amount   $ 11,613,000          
Investments, amortized cost   11,358,000          
Investments, fair value   $ 11,358,000          
Percent of net assets   3.60%   3.60%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:BridgepointHealthcareLLCMember whfcl:BridgepointHealthcareLLCMember          
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 Facilities Health Care Facilities Health Care Facilities Health Care Facilities      
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 8.00% 8.00% 8.00% 8.00%      
Interest Rate 12.46% 13.46% 12.46% 13.46%      
Acquisition Date Oct. 05, 2021 Oct. 05, 2021          
Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026      
Principal/Share Amount $ 238,000            
Investments, amortized cost 237,000            
Investments, fair value $ 231,000 $ (1,000)          
Percent of net assets 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:BridgepointHealthcareLLCMember whfcl:BridgepointHealthcareLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 8.00% 8.00% 8.00% 8.00%      
Interest Rate 12.46% 13.46% 12.46% 13.46%      
Acquisition Date Oct. 05, 2021 Oct. 05, 2021          
Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026      
Principal/Share Amount $ 8,517,000 $ 9,073,000          
Investments, amortized cost 8,457,000 8,973,000          
Investments, fair value $ 8,429,000 $ 8,967,000          
Percent of net assets 2.90% 2.80% 2.90% 2.80%      
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]: 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      
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, 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% 6.50% 5.00% 6.50%      
Interest Rate 8.45% 11.96% 8.45% 11.96%      
Acquisition Date Aug. 09, 2023 Aug. 09, 2023          
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029      
Principal/Share Amount $ 2,168,000            
Investments, amortized cost 2,120,000            
Investments, fair value $ 2,183,000 $ (3,000)          
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      
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, 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 6.50% 6.50% 6.50% 6.50%      
Interest Rate 10.96% 11.96% 10.96% 11.96%      
Acquisition Date Aug. 09, 2023 Aug. 09, 2023          
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029      
Principal/Share Amount $ 234,000 $ 180,000          
Investments, amortized cost 230,000 176,000          
Investments, fair value $ 248,000 $ 181,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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, 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 6.42% 6.50% 6.42% 6.50%      
Interest Rate 10.88% 11.96% 10.88% 11.96%      
Acquisition Date Aug. 09, 2023 Aug. 09, 2023          
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029      
Principal/Share Amount $ 6,904,000 $ 5,985,000          
Investments, amortized cost 6,774,000 5,845,000          
Investments, fair value $ 6,952,000 $ 5,898,000          
Investment, Identifier [Axis]: Bulk Midco, 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:BulkMidcoLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Wireless Telecommunication Services   Wireless Telecommunication Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   12.96%   12.96%      
Cash interest rate   11.96%   11.96%      
PIK interest rate   1.00%   1.00%      
Acquisition Date   Oct. 28, 2022          
Maturity Date   Jun. 10, 2024   Jun. 10, 2024      
Principal/Share Amount   $ 2,000,000          
Investments, amortized cost   1,989,000          
Investments, fair value   $ 1,972,000          
Percent of net assets   0.60%   0.60%      
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]: Bulk Midco, 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:BulkMidcoLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Wireless Telecommunication Services   Wireless Telecommunication Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   12.96%   12.96%      
Cash interest rate   11.96%   11.96%      
PIK interest rate   1.00%   1.00%      
Acquisition Date   Oct. 28, 2022          
Maturity Date   Jun. 10, 2024   Jun. 10, 2024      
Principal/Share Amount   $ 19,267,000          
Investments, amortized cost   19,237,000          
Investments, fair value   $ 18,997,000          
Percent of net assets   6.00%   6.00%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:CXHoldcoLLCMember whfcl:CXHoldcoLLCMember          
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Acquisition Date May 04, 2021 May 04, 2021          
Investment owned shares | shares 1,068 1,068 1,068 1,068      
Investments, amortized cost $ 1,116,000 $ 1,116,000          
Investments, fair value $ 2,232,000 $ 1,715,000          
Percent of net assets 0.80% 0.50% 0.80% 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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:CamarilloFitnessHoldingsLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities   Leisure Facilities        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.50%   8.50%        
PIK interest rate 12.98%   12.98%        
Acquisition Date Sep. 25, 2024            
Maturity Date Sep. 25, 2029   Sep. 25, 2029        
Principal/Share Amount $ 11,738,000            
Investments, amortized cost 10,269,000            
Investments, fair value $ 10,492,000            
Percent of net assets 3.70%   3.70%        
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]: 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 whfcl:CampFacilityServicesHoldingsLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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 10.96% 11.96% 10.96% 11.96%      
Acquisition Date Nov. 16, 2021 Nov. 16, 2021          
Maturity Date Nov. 16, 2027 Nov. 16, 2027 Nov. 16, 2027 Nov. 16, 2027      
Principal/Share Amount $ 10,424,000 $ 11,668,000          
Investments, amortized cost 10,325,000 11,517,000          
Investments, fair value $ 9,905,000 $ 11,496,000          
Percent of net assets 3.50% 3.60% 3.50% 3.60%      
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:CampFacilityServicesParentLLCMember whfcl:CampFacilityServicesParentLLCMember          
Investment, Type [Extensible Enumeration] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]      
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]      
Interest Rate 10.00% 10.00% 10.00% 10.00%      
PIK interest rate 10.00% 10.00% 10.00% 10.00%      
Acquisition Date Nov. 16, 2021 Nov. 16, 2021          
Investment owned shares | shares 15 15 15 15      
Investments, amortized cost $ 840,000 $ 840,000          
Investments, fair value $ 162,000 $ 1,023,000          
Percent of net assets 0.10% 0.30% 0.10% 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] 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            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
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        
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 10.40%   10.40%        
Acquisition Date Sep. 11, 2024            
Maturity Date May 04, 2029   May 04, 2029        
Investments, fair value $ 2,000            
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxHoldingsLimitedMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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        
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 10.40%   10.40%        
Acquisition Date Sep. 11, 2024            
Maturity Date May 04, 2029   May 04, 2029        
Principal/Share Amount $ 513,000            
Investments, amortized cost 665,000            
Investments, fair value $ 643,000            
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
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      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]      
Floor   1.00%   1.00%      
Spread Above Index   6.25%   6.25%      
Interest Rate   11.56%   11.56%      
Cash interest rate   11.31%   11.31%      
PIK interest rate   0.25%   0.25%      
Acquisition Date   Jul. 16, 2021          
Maturity Date   May 04, 2026   May 04, 2026      
Principal/Share Amount   $ 864,000          
Investments, amortized cost   1,182,000          
Investments, fair value   $ 1,082,000          
Investment, Identifier [Axis]: Cennox Holdings Limited., First lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]      
Floor   1.00%   1.00%      
Spread Above Index   6.25%   6.25%      
Acquisition Date   Jul. 16, 2021          
Maturity Date   May 04, 2026   May 04, 2026      
Principal/Share Amount   $ 2,825,000          
Investments, amortized cost   3,863,000          
Investments, fair value   $ 3,538,000          
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
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        
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 5.50%   5.50%        
Interest Rate 10.25%   10.25%        
Acquisition Date Sep. 11, 2024            
Maturity Date May 04, 2029   May 04, 2029        
Principal/Share Amount $ 29,000            
Investments, amortized cost 29,000            
Investments, fair value $ 30,000            
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 9.14%   9.14%        
Acquisition Date Sep. 11, 2024            
Maturity Date May 04, 2029   May 04, 2029        
Principal/Share Amount $ 594,000            
Investments, amortized cost 649,000            
Investments, fair value $ 611,000            
Investment, Identifier [Axis]: Cennox, Inc, First lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxInc.Member          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   10.44%   10.44%      
Cash interest rate   10.19%   10.19%      
PIK interest rate   0.25%   0.25%      
Acquisition Date   Jun. 28, 2022          
Maturity Date   May 04, 2026   May 04, 2026      
Principal/Share Amount   $ 9,422,000          
Investments, amortized cost   9,851,000          
Investments, fair value   $ 10,257,000          
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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        
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 5.50%   5.50%        
Interest Rate 10.34%   10.34%        
Acquisition Date Sep. 11, 2024            
Maturity Date May 04, 2029   May 04, 2029        
Principal/Share Amount $ 3,350,000            
Investments, amortized cost 3,319,000            
Investments, fair value $ 3,344,000            
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 affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:ChaseProductsCoMember whfcl:ChaseProductsCoMember          
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals      
Interest Rate 12.00% 12.00% 12.00% 12.00%      
PIK interest rate 12.00% 12.00% 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      
Principal/Share Amount $ 3,342,000 $ 2,962,000          
Investments, amortized cost 3,342,000 2,962,000          
Investments, fair value $ 3,342,000 $ 2,793,000          
Percent of net assets 1.20% 0.90% 1.20% 0.90%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:ClaridgeProductsandEquipmentLLCMember whfcl:ClaridgeProductsandEquipmentLLCMember          
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 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 8.31% 7.56% 8.31% 7.56%      
Interest Rate 14.13% 14.41% 14.13% 14.41%      
Cash interest rate 11.88% 12.91% 11.88% 12.91%      
PIK interest rate 2.25% 1.50% 2.25% 1.50%      
Acquisition Date Dec. 30, 2020 Dec. 30, 2020          
Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025      
Principal/Share Amount $ 632,000 $ 632,000          
Investments, amortized cost 630,000 628,000          
Investments, fair value $ 555,000 $ 496,000          
Percent of net assets 0.20% 0.20% 0.20% 0.20%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:ClaridgeProductsandEquipmentLLCMember whfcl:ClaridgeProductsandEquipmentLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Construction Materials Construction Materials Construction Materials Construction Materials      
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 8.75% 8.00% 8.75% 8.00%      
Interest Rate 13.21% 13.50% 13.21% 13.50%      
Cash interest rate 10.96% 12.00% 10.96% 12.00%      
PIK interest rate 2.25% 1.50% 2.25% 1.50%      
Acquisition Date Dec. 30, 2020 Dec. 30, 2020          
Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025      
Principal/Share Amount $ 5,711,000 $ 7,452,000          
Investments, amortized cost 5,690,000 7,395,000          
Investments, fair value $ 5,085,000 $ 6,405,000          
Percent of net assets 1.80% 2.00% 1.80% 2.00%      
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]: Clark Restaurant Service, LLC, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:ClarkRestaurantServiceLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.11%   10.11%        
Acquisition Date Jun. 14, 2024            
Maturity Date May 10, 2029   May 10, 2029        
Principal/Share Amount $ 5,006,000            
Investments, amortized cost 4,919,000            
Investments, fair value $ 4,993,000            
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:CleanChoiceEnergyIncMember whfcl:CleanChoiceEnergyIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Electric Utilities Electric Utilities Electric Utilities Electric Utilities      
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 7.59% 7.58% 7.59% 7.58%      
Interest Rate 12.39% 13.14% 12.39% 13.14%      
Acquisition Date Oct. 12, 2021 Oct. 12, 2021          
Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026      
Principal/Share Amount $ 15,955,000 $ 15,955,000          
Investments, amortized cost 15,802,000 15,715,000          
Investments, fair value $ 16,032,000 $ 15,954,000          
Percent of net assets 5.60% 5.00% 5.60% 5.00%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:CoastalTelevisionBroadcastingGroupLLCMember whfcl:CoastalTelevisionBroadcastingGroupLLCMember          
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] Broadcasting Broadcasting Broadcasting Broadcasting      
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% 7.00% 6.50% 7.00%      
Interest Rate 10.96% 12.46% 10.96% 12.46%      
Acquisition Date Dec. 30, 2021 Dec. 30, 2021          
Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026      
Investments, fair value $ 1,000 $ (3,000)          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:CoastalTelevisionBroadcastingGroupLLCMember whfcl:CoastalTelevisionBroadcastingGroupLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Broadcasting Broadcasting Broadcasting Broadcasting      
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% 7.00% 6.50% 7.00%      
Interest Rate 10.96% 12.46% 10.96% 12.46%      
Acquisition Date Dec. 30, 2021 Dec. 30, 2021          
Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026      
Principal/Share Amount $ 7,879,000 $ 7,418,000          
Investments, amortized cost 7,808,000 7,329,000          
Investments, fair value $ 7,832,000 $ 7,246,000          
Percent of net assets 2.70% 2.30% 2.70% 2.30%      
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]: Drew Foam Companies Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:DrewFoamCompaniesIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   7.25%   7.25%      
Interest Rate   12.75%   12.75%      
Acquisition Date   Nov. 09, 2020          
Maturity Date   Nov. 05, 2025   Nov. 05, 2025      
Principal/Share Amount   $ 13,644,000          
Investments, amortized cost   13,541,000          
Investments, fair value   $ 13,313,000          
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:DrewFoamCompaniesIncMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.48%   10.48%        
Acquisition Date Nov. 09, 2020            
Maturity Date Dec. 07, 2026   Dec. 07, 2026        
Principal/Share Amount $ 13,501,000            
Investments, amortized cost 13,445,000            
Investments, fair value $ 13,437,000            
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          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   5.50%   5.50%      
Interest Rate   11.00%   11.00%      
Acquisition Date   Jul. 15, 2021          
Maturity Date   Jun. 23, 2027   Jun. 23, 2027      
Principal/Share Amount   $ 8,604,000          
Investments, amortized cost   8,541,000          
Investments, fair value   $ 8,562,000          
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            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.98%   9.98%        
Acquisition Date Jul. 15, 2021            
Maturity Date Jun. 23, 2027   Jun. 23, 2027        
Principal/Share Amount $ 8,342,000            
Investments, amortized cost 8,299,000            
Investments, fair value $ 8,342,000            
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 whfcl:EddyAcquisitionsLLCMember          
Investment, Type [Extensible Enumeration] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]      
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      
Interest Rate 12.00% 12.00% 12.00% 12.00%      
Acquisition Date Sep. 15, 2021 Sep. 15, 2021          
Investment owned shares | shares 167 167 167 167      
Investments, amortized cost $ 167,000 $ 167,000          
Investments, fair value   $ 18,000          
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 false true false      
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        
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember            
Investment, Type [Extensible Enumeration] whfcl:SeniorPreferredUnitsMember   whfcl:SeniorPreferredUnitsMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Education Services   Education Services        
Acquisition Date Sep. 15, 2021            
Investment owned shares | shares 167   167        
Investments, amortized cost $ 167,000            
Investments, fair value $ 100,000            
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember whfcl:EducationDynamicsLLCMember          
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] Education Services Education Services Education Services Education 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 6.50% 7.00% 6.50% 7.00%      
Interest Rate 10.96% 12.46% 10.96% 12.46%      
Cash interest rate   11.96%   11.96%      
PIK interest rate   0.50%   0.50%      
Acquisition Date Sep. 15, 2021 Sep. 15, 2021          
Maturity Date Sep. 15, 2027 Sep. 15, 2026 Sep. 15, 2027 Sep. 15, 2026      
Investments, fair value $ (51,000) $ (22,000)          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember whfcl:EducationDynamicsLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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      
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% 7.00% 6.50% 7.00%      
Interest Rate 10.96% 12.46% 10.96% 12.46%      
Cash interest rate   11.96%   11.96%      
PIK interest rate   0.50%   0.50%      
Acquisition Date Sep. 15, 2021 Sep. 15, 2021          
Maturity Date Sep. 15, 2027 Sep. 15, 2026 Sep. 15, 2027 Sep. 15, 2026      
Principal/Share Amount $ 13,089,000 $ 12,784,000          
Investments, amortized cost 12,989,000 12,647,000          
Investments, fair value $ 12,449,000 $ 12,407,000          
Percent of net assets 4.30% 4.00% 4.30% 4.00%      
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]: EducationDynamics, LLC Subordinated Unsecured Term Loa              
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:EducationDynamicsLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:SubordinatedUnsecuredTermLoanMember   whfcl:SubordinatedUnsecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Education Services   Education Services      
Interest Rate   4.00%   4.00%      
Acquisition Date   Sep. 15, 2021          
Maturity Date   Mar. 15, 2027   Mar. 15, 2027      
Principal/Share Amount   $ 167,000          
Investments, amortized cost   167,000          
Investments, fair value   $ 167,000          
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]   false   false      
Investment, Identifier [Axis]: Empire Office, 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:EmpireOfficeIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Office Services & Supplies   Office Services & Supplies      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.50%   1.50%      
Spread Above Index   6.75%   6.75%      
Interest Rate   12.21%   12.21%      
Acquisition Date   Aug. 17, 2021          
Maturity Date   Apr. 12, 2024   Apr. 12, 2024      
Principal/Share Amount   $ 4,556,000          
Investments, amortized cost   4,545,000          
Investments, fair value   $ 4,556,000          
Percent of net assets   1.40%   1.40%      
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]: Empire Office, 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:EmpireOfficeIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Office Services & Supplies   Office Services & Supplies      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.50%   1.50%      
Spread Above Index   6.75%   6.75%      
Interest Rate   12.21%   12.21%      
Acquisition Date   Apr. 12, 2019          
Maturity Date   Apr. 12, 2024   Apr. 12, 2024      
Principal/Share Amount   $ 10,947,000          
Investments, amortized cost   10,931,000          
Investments, fair value   $ 10,947,000          
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:EventServicesAmericaIncMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Security & Alarm Services   Security & Alarm Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.75%   6.75%        
Interest Rate 11.11%   11.11%        
Acquisition Date Jan. 31, 2024            
Maturity Date Jan. 31, 2029   Jan. 31, 2029        
Principal/Share Amount $ 7,000,000            
Investments, amortized cost 6,857,000            
Investments, fair value $ 7,070,000            
Percent of net assets 2.50%   2.50%        
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]: 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 whfcl:FgiAcquisitionCorpMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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 10.98% 12.00% 10.98% 12.00%      
Acquisition Date Oct. 28, 2019 Oct. 28, 2019          
Maturity Date Oct. 29, 2026 Oct. 29, 2026 Oct. 29, 2026 Oct. 29, 2026      
Principal/Share Amount $ 16,026,000 $ 16,193,000          
Investments, amortized cost 15,765,000 15,786,000          
Investments, fair value $ 16,026,000 $ 16,110,000          
Percent of net assets 5.60% 5.10% 5.60% 5.10%      
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]: FloWorks International LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:FloworksInternationalLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 0.75%   0.75%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.40%   10.40%        
Acquisition Date Dec. 12, 2024            
Maturity Date 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            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 0.75%   0.75%        
Spread Above Index 4.75%   4.75%        
Interest Rate 9.27%   9.27%        
Acquisition Date Dec. 12, 2024            
Maturity Date Nov. 26, 2031   Nov. 26, 2031        
Principal/Share Amount $ 5,333,000            
Investments, amortized cost 5,280,000            
Investments, fair value $ 5,281,000            
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:FoodservicesBrandGroupLlcMember whfcl:FoodservicesBrandGroupLlcMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors      
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 8.00% 8.00% 8.00% 8.00%      
Interest Rate 12.62% 13.52% 12.62% 13.52%      
Acquisition Date Nov. 22, 2022 Nov. 22, 2022          
Maturity Date Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025      
Principal/Share Amount $ 357,000 $ 357,000          
Investments, amortized cost 357,000 357,000          
Investments, fair value $ 321,000 $ 200,000          
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]: Foodservices Brand Group, LLC 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:FoodservicesBrandGroupLlcMember          
Investment, Type [Extensible Enumeration]   whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Distributors   Distributors      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.50%   1.50%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   Nov. 22, 2022          
Maturity Date   Jan. 08, 2026   Jan. 08, 2026      
Principal/Share Amount   $ 5,171,000          
Investments, amortized cost   4,915,000          
Investments, fair value   $ 1,601,000          
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]   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      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.25% 11.23% 12.25%      
Acquisition Date Mar. 11, 2022 Mar. 11, 2022          
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026      
Principal/Share Amount $ 3,023,000 $ 3,054,000          
Investments, amortized cost 3,000,000 3,018,000          
Investments, fair value $ 3,023,000 $ 3,025,000          
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      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.25% 11.23% 12.25%      
Acquisition Date Feb. 18, 2022 Feb. 18, 2022          
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026      
Investments, fair value $ 5,000 $ 1,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.25% 11.23% 12.25%      
Acquisition Date Feb. 18, 2022 Feb. 18, 2022          
Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026      
Principal/Share Amount $ 9,007,000 $ 9,100,000          
Investments, amortized cost 8,937,000 8,991,000          
Investments, fair value $ 9,007,000 $ 9,014,000          
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:FuturePaymentTechnologiesLPMember whfcl:FuturePaymentTechnologiesLPMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 8.25% 8.25% 8.25% 8.25%      
Interest Rate 12.90% 13.69% 12.90% 13.69%      
Acquisition Date Dec. 23, 2016 Dec. 23, 2016          
Maturity Date Dec. 05, 2025 Dec. 05, 2025 Dec. 05, 2025 Dec. 05, 2025      
Principal/Share Amount $ 20,420,000 $ 21,665,000          
Investments, amortized cost 20,382,000 21,582,000          
Investments, fair value $ 20,420,000 $ 21,480,000          
Percent of net assets 7.10% 6.80% 7.10% 6.80%      
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.00% 6.50% 6.00% 6.50%      
Interest Rate 9.49% 11.94% 9.49% 11.94%      
Acquisition Date Jan. 22, 2020 Jan. 22, 2020          
Maturity Date Dec. 21, 2026 Dec. 19, 2024 Dec. 21, 2026 Dec. 19, 2024      
Investments, fair value $ 2,000 $ 5,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.00% 6.50% 6.00% 6.50%      
Interest Rate 9.49% 11.94% 9.49% 11.94%      
Acquisition Date Jan. 22, 2020 Jan. 22, 2020          
Maturity Date Dec. 21, 2026 Dec. 19, 2024 Dec. 21, 2026 Dec. 19, 2024      
Principal/Share Amount $ 18,415,000 $ 19,416,000          
Investments, amortized cost 14,234,000 14,969,000          
Investments, fair value $ 12,883,000 $ 14,654,000          
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:GulfWindsInternationalAcquisitionLlcMember whfcl:GulfWindsInternationalAcquisitionLlcMember          
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] 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:SecuredOvernightFinancingRateSofrMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 7.50% 7.00% 7.50% 7.00%      
Interest Rate 11.95% 12.46% 11.95% 12.46%      
Acquisition Date Dec. 16, 2022 Dec. 16, 2022          
Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028      
Principal/Share Amount $ 453,000            
Investments, amortized cost 444,000            
Investments, fair value $ 447,000 $ 7,000          
Percent of net assets 0.20%   0.20%        
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:GulfWindsInternationalAcquisitionLlcMember whfcl:GulfWindsInternationalAcquisitionLlcMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 7.60% 7.00% 7.60% 7.00%      
Interest Rate 11.96% 12.46% 11.96% 12.46%      
Acquisition Date Dec. 16, 2022 Dec. 16, 2022          
Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028      
Principal/Share Amount $ 8,994,000 $ 4,804,000          
Investments, amortized cost 8,811,000 4,685,000          
Investments, fair value $ 8,857,000 $ 4,738,000          
Percent of net assets 3.10% 1.50% 3.10% 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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:HIGCamarilloLpMember            
Investment, Type [Extensible Enumeration] whfcl:LimitedPartnerInterestsMember   whfcl:LimitedPartnerInterestsMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities   Leisure Facilities        
Acquisition Date Sep. 25, 2024            
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]: HC Salon 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:HCSalonHoldingsIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   12.11%   12.11%      
Acquisition Date   Sep. 30, 2021          
Maturity Date   Sep. 30, 2026   Sep. 30, 2026      
Investments, fair value   $ 8,000          
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]: HC Salon 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:HCSalonHoldingsIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   12.11%   12.11%      
Acquisition Date   Sep. 30, 2021          
Maturity Date   Sep. 30, 2026   Sep. 30, 2026      
Principal/Share Amount   $ 11,404,000          
Investments, amortized cost   11,279,000          
Investments, fair value   $ 11,404,000          
Percent of net assets   3.60%   3.60%      
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]: 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      
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] Base Rate [Member] Base Rate [Member] Base Rate [Member] Base Rate [Member]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.97% 6.22% 6.97% 6.22%      
Interest Rate 11.29% 12.10% 11.29% 12.10%      
Acquisition Date Feb. 18, 2022 Feb. 18, 2022          
Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026      
Principal/Share Amount $ 1,395,000 $ 2,398,000          
Investments, amortized cost 1,384,000 2,369,000          
Investments, fair value $ 1,354,000 $ 2,282,000          
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      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.25% 6.25% 6.25%      
Interest Rate 11.02% 11.80% 11.02% 11.80%      
Acquisition Date Feb. 18, 2022 Feb. 18, 2022          
Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026      
Principal/Share Amount $ 483,000 $ 596,000          
Investments, amortized cost 480,000 589,000          
Investments, fair value $ 455,000 $ 547,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.25% 6.25% 6.25%      
Interest Rate 11.02% 11.80% 11.02% 11.80%      
Acquisition Date Dec. 28, 2021 Dec. 28, 2021          
Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026      
Principal/Share Amount $ 5,563,000 $ 9,555,000          
Investments, amortized cost 5,523,000 9,448,000          
Investments, fair value $ 5,395,000 $ 9,074,000          
Investment, Identifier [Axis]: Hollander Intermediate 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:HollanderIntermediateLlcMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Home Furnishings   Home Furnishings      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   3.00%   3.00%      
Spread Above Index   10.75%   10.75%      
Interest Rate   16.22%   16.22%      
Acquisition Date   Sep. 19, 2022          
Maturity Date   Sep. 21, 2026   Sep. 21, 2026      
Principal/Share Amount   $ 4,689,000          
Investments, amortized cost   4,661,000          
Investments, fair value   $ 4,179,000          
Percent of net assets   1.30%   1.30%      
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]: Honors 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      
Investment, Issuer Name [Extensible Enumeration]   Honors Holdings, LLC [Member]          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Leisure Facilities   Leisure Facilities      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.37%   6.37%      
Interest Rate   11.90%   11.90%      
Acquisition Date   Sep. 06, 2019          
Maturity Date   Sep. 06, 2024   Sep. 06, 2024      
Principal/Share Amount   $ 4,650,000          
Investments, amortized cost   4,631,000          
Investments, fair value   $ 4,603,000          
Percent of net assets   1.50%   1.50%      
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]: Honors 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      
Investment, Issuer Name [Extensible Enumeration]   Honors Holdings, LLC [Member]          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Leisure Facilities   Leisure Facilities      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.49%   6.49%      
Interest Rate   12.02%   12.02%      
Acquisition Date   Sep. 06, 2019          
Maturity Date   Sep. 06, 2024   Sep. 06, 2024      
Principal/Share Amount   $ 9,441,000          
Investments, amortized cost   9,375,000          
Investments, fair value   $ 9,347,000          
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 5.50% 5.50% 5.50% 5.50%      
Interest Rate 10.35% 11.11% 10.35% 11.11%      
Acquisition Date Feb. 17, 2022 Feb. 17, 2022          
Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026      
Investments, fair value $ 4,000            
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 5.50% 5.50% 5.50% 5.50%      
Interest Rate 10.35% 11.11% 10.35% 11.11%      
Acquisition Date Feb. 17, 2022 Feb. 17, 2022          
Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026      
Principal/Share Amount $ 3,307,000 $ 3,541,000          
Investments, amortized cost 3,286,000 3,503,000          
Investments, fair value $ 3,307,000 $ 3,504,000          
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:ImageOneIndustriesLLCMember whfcl:ImageOneIndustriesLLCMember          
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonAUnitsMember whfcl:CommonUnitsMember whfcl:CommonAUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising      
Acquisition Date Sep. 20, 2019 Sep. 20, 2019          
Investment owned shares | shares 235 149 235 149      
Investments, amortized cost $ 10,000 $ 7,000          
Investments, fair value $ 12,000 $ 9,000          
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]: Industrial Specialty Services USA 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:IndustrialSpecialtyServicesUSALLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services   Environmental & Facilities Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.75%   6.75%      
Interest Rate   12.25%   12.25%      
Acquisition Date   Dec. 31, 2021          
Maturity Date   Dec. 31, 2026   Dec. 31, 2026      
Principal/Share Amount   $ 11,767,000          
Investments, amortized cost   11,626,000          
Investments, fair value   $ 11,537,000          
Percent of net assets   3.60%   3.60%      
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]: JVMC Holdings 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:JVMCHoldingsCorpMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Investment Banking & Brokerage   Investment Banking & Brokerage      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   Feb. 28, 2019          
Maturity Date   Feb. 28, 2024   Feb. 28, 2024      
Principal/Share Amount   $ 3,522,000          
Investments, amortized cost   3,521,000          
Investments, fair value   $ 3,522,000          
Percent of net assets   1.10%   1.10%      
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]: 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      
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, 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 6.25% 6.25% 6.25% 6.25%      
Interest Rate 10.85% 11.94% 10.85% 11.94%      
Acquisition Date Mar. 01, 2022 Mar. 01, 2022          
Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026      
Principal/Share Amount $ 2,343,000 $ 2,366,000          
Investments, amortized cost 2,326,000 2,341,000          
Investments, fair value $ 2,343,000 $ 2,342,000          
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      
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, 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 6.25% 6.25% 6.25% 6.25%      
Interest Rate 10.82% 12.11% 10.82% 12.11%      
Acquisition Date Mar. 01, 2022 Mar. 01, 2022          
Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026      
Principal/Share Amount $ 517,000 $ 199,000          
Investments, amortized cost 513,000 197,000          
Investments, fair value $ 522,000 $ 193,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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, 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 6.25% 6.25% 6.25% 6.25%      
Interest Rate 10.84% 11.86% 10.84% 11.86%      
Acquisition Date Mar. 01, 2022 Mar. 01, 2022          
Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026      
Principal/Share Amount $ 11,078,000 $ 11,192,000          
Investments, amortized cost 11,000,000 11,073,000          
Investments, fair value $ 11,078,000 $ 11,080,000          
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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 6.50% 6.50% 6.50% 6.50%      
Interest Rate 11.02% 11.88% 11.02% 11.88%      
Acquisition Date Nov. 27, 2023 Nov. 27, 2023          
Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028      
Investments, fair value $ 9,000            
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 6.50% 6.50% 6.50% 6.50%      
Interest Rate 11.02% 11.88% 11.02% 11.88%      
Acquisition Date Nov. 27, 2023 Nov. 27, 2023          
Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028      
Principal/Share Amount $ 6,354,000 $ 6,418,000          
Investments, amortized cost 6,256,000 6,294,000          
Investments, fair value $ 6,323,000 $ 6,295,000          
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        
Investment, Issuer Name [Extensible Enumeration] Kelso Industries L L C [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.09%   10.09%        
Acquisition Date Dec. 26, 2024            
Maturity Date Dec. 31, 2029   Dec. 31, 2029        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Kelso Industries L L C [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.09%   10.09%        
Acquisition Date Dec. 26, 2024            
Maturity Date Dec. 31, 2029   Dec. 31, 2029        
Principal/Share Amount $ 3,611,000            
Investments, amortized cost 3,539,000            
Investments, fair value $ 3,539,000            
Percent of net assets 1.20%   1.20%        
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]: 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      
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]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Acquisition Date Dec. 31, 2020 Dec. 31, 2020          
Investment owned shares | shares 496 496 496 496      
Investments, amortized cost $ 496,000 $ 496,000          
Investments, fair value $ 779,000 $ 683,000          
Percent of net assets 0.30% 0.20% 0.30% 0.20%      
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]: LINC Systems, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.25%   6.25%      
Interest Rate   11.93%   11.93%      
Acquisition Date   Jun. 22, 2021          
Maturity Date   Feb. 24, 2026   Feb. 24, 2026      
Investments, fair value   $ (1,000)          
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.25%   6.25%      
Interest Rate   11.93%   11.93%      
Acquisition Date   Jun. 22, 2021          
Maturity Date   Feb. 24, 2026   Feb. 24, 2026      
Principal/Share Amount   $ 8,534,000          
Investments, amortized cost   8,454,000          
Investments, fair value   $ 8,443,000          
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:LINCSystemsLLCMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 8.50%   8.50%        
Interest Rate 12.99%   12.99%        
Acquisition Date Jun. 22, 2021            
Maturity Date Feb. 24, 2026   Feb. 24, 2026        
Investments, fair value $ 3,000            
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:LINCSystemsLLCMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 8.50%   8.50%        
Interest Rate 12.99%   12.99%        
Acquisition Date Jun. 22, 2021            
Maturity Date Feb. 24, 2026   Feb. 24, 2026        
Principal/Share Amount $ 8,155,000            
Investments, amortized cost 8,114,000            
Investments, fair value $ 8,155,000            
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:LMGHoldingsIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Electronic Equipment & Instruments   Electronic Equipment & Instruments      
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   6.50%   6.50%      
Interest Rate   12.00%   12.00%      
Acquisition Date   Jun. 28, 2021          
Maturity Date   Apr. 30, 2026   Apr. 30, 2026      
Principal/Share Amount   $ 13,330,000          
Investments, amortized cost   13,203,000          
Investments, fair value   $ 13,265,000          
Investment, Identifier [Axis]: LMG Holdings, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:LMGHoldingsIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Electronic Equipment & Instruments   Electronic Equipment & Instruments      
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   6.50%   6.50%      
Interest Rate   12.00%   12.00%      
Acquisition Date   Jun. 28, 2021          
Maturity Date   Apr. 30, 2026   Apr. 30, 2026      
Investments, fair value   $ 4,000          
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:LSCSHoldingsIncMember whfcl:LSCSHoldingsIncMember          
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Life Sciences Tools & Services Life Sciences Tools & Services Life Sciences Tools & Services Life Sciences Tools & Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 0.50% 0.50% 0.50% 0.50%      
Spread Above Index 8.00% 8.00% 8.00% 8.00%      
Interest Rate 12.47% 13.47% 12.47% 13.47%      
Acquisition Date Nov. 23, 2021 Nov. 23, 2021          
Maturity Date Dec. 16, 2029 Dec. 16, 2029 Dec. 16, 2029 Dec. 16, 2029      
Principal/Share Amount $ 5,000,000 $ 5,000,000          
Investments, amortized cost 4,953,000 4,944,000          
Investments, fair value $ 5,000,000 $ 4,901,000          
Percent of net assets 1.70% 1.50% 1.70% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:LabLogisticsLLCMember whfcl:LabLogisticsLLCMember          
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 Services Health Care Services Health Care Services Health Care 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 7.25% 7.25% 7.25% 7.25%      
Interest Rate 11.71% 12.71% 11.71% 12.71%      
Acquisition Date Oct. 16, 2019 Oct. 16, 2019          
Maturity Date Dec. 31, 2025 Sep. 25, 2024 Dec. 31, 2025 Sep. 25, 2024      
Principal/Share Amount $ 5,020,000 $ 5,090,000          
Investments, amortized cost 5,020,000 5,089,000          
Investments, fair value $ 5,020,000 $ 5,090,000          
Percent of net assets 1.80% 1.60% 1.80% 1.60%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:LabLogisticsLLCMember            
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 Services   Health Care Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 7.25%   7.25%        
Interest Rate 11.71%   11.71%        
Acquisition Date Sep. 17, 2024            
Maturity Date Dec. 31, 2025   Dec. 31, 2025        
Principal/Share Amount $ 437,000            
Investments, amortized cost 437,000            
Investments, fair value $ 437,000            
Percent of net assets 0.20%   0.20%        
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 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:LabLogisticsLLCMember whfcl:LabLogisticsLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 7.25% 7.25% 7.25% 7.25%      
Interest Rate 11.71% 12.71% 11.71% 12.71%      
Acquisition Date Oct. 16, 2019 Oct. 16, 2019          
Maturity Date Dec. 31, 2025 Sep. 25, 2024 Dec. 31, 2025 Sep. 25, 2024      
Principal/Share Amount $ 5,383,000 $ 5,449,000          
Investments, amortized cost 5,381,000 5,442,000          
Investments, fair value $ 5,383,000 $ 5,449,000          
Percent of net assets 1.90% 1.70% 1.90% 1.70%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:LeviathanIntermediateHoldcoLlcMember whfcl:LeviathanIntermediateHoldcoLlcMember          
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] Leisure Products Leisure Products Leisure Products Leisure Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.50% 1.50% 1.50% 1.50%      
Spread Above Index 7.50% 7.50% 7.50% 7.50%      
Interest Rate 11.98% 13.00% 11.98% 13.00%      
Acquisition Date Dec. 27, 2022 Dec. 27, 2022          
Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027      
Investments, fair value $ 10,000 $ 14,000          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:LeviathanIntermediateHoldcoLlcMember whfcl:LeviathanIntermediateHoldcoLlcMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [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, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.50% 1.50% 1.50% 1.50%      
Spread Above Index 7.50% 7.50% 7.50% 7.50%      
Interest Rate 11.98% 13.00% 11.98% 13.00%      
Acquisition Date Dec. 27, 2022 Dec. 27, 2022          
Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027      
Principal/Share Amount $ 13,211,000 $ 10,346,000          
Investments, amortized cost 12,981,000 10,098,000          
Investments, fair value $ 13,312,000 $ 10,346,000          
Percent of net assets 4.60% 3.30% 4.60% 3.30%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:LiftBrandsIncMember whfcl:LiftBrandsIncMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember whfcl:FirstLienSecuredTermLoanAMember      
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 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 7.50% 7.50% 7.50% 7.50%      
Interest Rate 11.96% 12.96% 11.96% 12.96%      
Acquisition Date Jun. 29, 2020 Jun. 29, 2020          
Maturity Date Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025      
Principal/Share Amount $ 5,461,000 $ 5,518,000          
Investments, amortized cost 5,453,000 5,492,000          
Investments, fair value $ 5,461,000 $ 5,457,000          
Percent of net assets 1.90% 1.70% 1.90% 1.70%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:LiftBrandsIncMember whfcl:LiftBrandsIncMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember whfcl:FirstLienSecuredTermLoanBMember      
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      
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      
Principal/Share Amount $ 1,594,000 $ 1,450,000          
Investments, amortized cost 1,592,000 1,441,000          
Investments, fair value $ 1,594,000 $ 1,406,000          
Percent of net assets 0.60% 0.40% 0.60% 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]: 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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
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 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] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
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 $ 6,220,000            
Investments, amortized cost 6,144,000            
Investments, fair value $ 6,144,000            
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:LuxuryBrandHoldingsIncMember whfcl:LuxuryBrandHoldingsIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail      
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% 6.50% 5.75% 6.50%      
Interest Rate 10.11% 11.96% 10.11% 11.96%      
Acquisition Date Dec. 04, 2020 Dec. 04, 2020          
Maturity Date Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026      
Principal/Share Amount $ 4,580,000 $ 5,280,000          
Investments, amortized cost 4,556,000 5,233,000          
Investments, fair value $ 4,580,000 $ 5,280,000          
Percent of net assets 1.60% 1.70% 1.60% 1.70%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:M2sGroupIntermediateHoldingsIncMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Paper Products   Paper Products        
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member]   Base Rate [Member]        
Floor 0.50%   0.50%        
Spread Above Index 4.73%   4.73%        
Interest Rate 9.10%   9.10%        
Acquisition Date Aug. 22, 2024            
Maturity Date Aug. 25, 2031   Aug. 25, 2031        
Principal/Share Amount $ 9,770,000            
Investments, amortized cost 9,119,000            
Investments, fair value $ 9,453,000            
Percent of net assets 3.30%   3.30%        
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:MbsHighwayLlcMember whfcl:MbsHighwayLlcMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software      
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 8.50% 7.50% 8.50% 7.50%      
Interest Rate 13.20% 13.18% 13.20% 13.18%      
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      
Principal/Share Amount $ 9,286,000 $ 9,381,000          
Investments, amortized cost 9,157,000 9,204,000          
Investments, fair value $ 9,212,000 $ 9,089,000          
Percent of net assets 3.20% 2.90% 3.20% 2.90%      
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 5.97% 6.50% 5.97% 6.50%      
Interest Rate 10.51% 11.98% 10.51% 11.98%      
Acquisition Date May 10, 2023 May 10, 2023          
Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029      
Principal/Share Amount $ 821,000 $ 392,000          
Investments, amortized cost 804,000 378,000          
Investments, fair value $ 817,000 $ 389,000          
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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] us-gaap:PrimeRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 5.50% 6.50% 5.50% 6.50%      
Interest Rate 13.00% 11.98% 13.00% 11.98%      
Acquisition Date May 10, 2023 May 10, 2023          
Maturity Date Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028      
Principal/Share Amount $ 241,000            
Investments, amortized cost 236,000            
Investments, fair value $ 249,000 $ 11,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 6.39% 6.50% 6.39% 6.50%      
Interest Rate 10.85% 11.98% 10.85% 11.98%      
Acquisition Date May 10, 2023 May 10, 2023          
Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029      
Principal/Share Amount $ 7,187,000 $ 6,247,000          
Investments, amortized cost 7,040,000 6,084,000          
Investments, fair value $ 7,176,000 $ 6,194,000          
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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Education Services   Education Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]   Base Rate [Member]      
Floor   1.00%   1.00%      
Spread Above Index   6.84%   6.84%      
Interest Rate   15.06%   15.06%      
Acquisition Date   Apr. 25, 2022          
Maturity Date   Apr. 24, 2026   Apr. 24, 2026      
Principal/Share Amount   $ 825,000          
Investments, amortized cost   815,000          
Investments, fair value   $ 776,000          
Percent of net assets   0.20%   0.20%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Education Services   Education Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.75%   7.75%      
Interest Rate   13.29%   13.29%      
Acquisition Date   Apr. 25, 2022          
Maturity Date   Apr. 24, 2026   Apr. 24, 2026      
Principal/Share Amount   $ 7,333,000          
Investments, amortized cost   7,248,000          
Investments, fair value   $ 6,972,000          
Percent of net assets   2.20%   2.20%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:MSIInformationServicesIncMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Education Services   Education Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member]   Base Rate [Member]        
Floor 1.00%   1.00%        
Spread Above Index 8.82%   8.82%        
Interest Rate 15.24%   15.24%        
Acquisition Date Apr. 25, 2022            
Maturity Date Apr. 24, 2026   Apr. 24, 2026        
Principal/Share Amount $ 1,050,000            
Investments, amortized cost 1,043,000            
Investments, fair value $ 945,000            
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:MSIInformationServicesIncMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Education Services   Education Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 9.75%   9.75%        
Interest Rate 14.23%   14.23%        
Acquisition Date Apr. 25, 2022            
Maturity Date Apr. 24, 2026   Apr. 24, 2026        
Principal/Share Amount $ 8,746,000            
Investments, amortized cost 8,552,000            
Investments, fair value $ 7,871,000            
Percent of net assets 2.80%   2.80%        
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]: 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      
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: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] 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:SecuredOvernightFinancingRateSofrMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 8.00% 8.00% 8.00% 8.00%      
Interest Rate 12.43% 13.45% 12.43% 13.45%      
Acquisition Date Apr. 07, 2023 Apr. 07, 2023          
Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029      
Investments, fair value $ 5,000 $ (1,000)          
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]: 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      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 8.00% 8.00% 8.00% 8.00%      
Interest Rate 12.43% 13.45% 12.43% 13.45%      
Acquisition Date Apr. 07, 2023 Apr. 07, 2023          
Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029      
Principal/Share Amount $ 4,927,000 $ 4,726,000          
Investments, amortized cost 4,823,000 4,602,000          
Investments, fair value $ 4,922,000 $ 4,580,000          
Percent of net assets 1.70% 1.40% 1.70% 1.40%      
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]: Manchester Acquisition Sub 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:ManchesterAcquisitionSubLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Diversified Chemicals   Diversified Chemicals      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   0.75%   0.75%      
Spread Above Index   5.75%   5.75%      
Interest Rate   11.28%   11.28%      
Acquisition Date   Nov. 16, 2021          
Maturity Date   Dec. 01, 2026   Dec. 01, 2026      
Principal/Share Amount   $ 7,840,000          
Investments, amortized cost   7,587,000          
Investments, fair value   $ 7,215,000          
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.50% 6.50% 6.50% 6.50%      
Interest Rate 11.03% 11.99% 11.03% 11.99%      
Acquisition Date Jul. 19, 2019 Jul. 19, 2019          
Maturity Date Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025      
Investments, fair value $ (38,000) $ (3,000)          
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MarlinDTC-LSMidco2LLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.99%   11.99%      
Acquisition Date   Jul. 19, 2019          
Maturity Date   Jul. 01, 2025   Jul. 01, 2025      
Principal/Share Amount   $ 18,908,000          
Investments, amortized cost   18,798,000          
Investments, fair value   $ 18,762,000          
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            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 11.03%   11.03%        
Acquisition Date Jul. 19, 2019            
Maturity Date Jul. 01, 2025   Jul. 01, 2025        
Principal/Share Amount $ 18,613,000            
Investments, amortized cost 18,577,000            
Investments, fair value $ 17,865,000            
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      
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]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Acquisition Date Sep. 29, 2022 Sep. 29, 2022          
Investment owned shares | shares 4 4 4 4      
Investments, amortized cost $ 400,000 $ 400,000          
Investments, fair value   $ 179,000          
Percent of net assets   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]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   7.66%   7.66%      
Interest Rate   13.15%   13.15%      
Acquisition Date   Oct. 07, 2022          
Maturity Date   Sep. 29, 2028   Sep. 29, 2028      
Investments, fair value   $ (17,000)          
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Paper & Plastic Packaging Products & Materials   Paper & Plastic Packaging Products & Materials      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:CanadianDollarOfferedRateMember   whfcl:CanadianDollarOfferedRateMember      
Floor   1.00%   1.00%      
Spread Above Index   7.66%   7.66%      
Interest Rate   13.15%   13.15%      
Acquisition Date   Oct. 07, 2022          
Maturity Date   Sep. 29, 2028   Sep. 29, 2028      
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   7.66%   7.66%      
Interest Rate   13.15%   13.15%      
Acquisition Date   Oct. 07, 2022          
Maturity Date   Sep. 29, 2028   Sep. 29, 2028      
Principal/Share Amount   $ 6,589,000          
Investments, amortized cost   6,485,000          
Investments, fair value   $ 6,488,000          
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 8.10%   8.10%        
Interest Rate 12.56%   12.56%        
Acquisition Date Oct. 07, 2022            
Maturity Date Sep. 29, 2028   Sep. 29, 2028        
Principal/Share Amount $ 414,000            
Investments, amortized cost 411,000            
Investments, fair value $ 402,000            
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials   Paper & Plastic Packaging Products & Materials        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianOvernightRepoRateAverageMember   whfcl:CanadianOvernightRepoRateAverageMember        
Floor 1.00%   1.00%        
Spread Above Index 8.10%   8.10%        
Interest Rate 12.56%   12.56%        
Acquisition Date Oct. 07, 2022            
Maturity Date Sep. 29, 2028   Sep. 29, 2028        
Investments, fair value $ (3,000)            
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 8.11%   8.11%        
Interest Rate 12.57%   12.57%        
Acquisition Date Oct. 07, 2022            
Maturity Date Sep. 29, 2028   Sep. 29, 2028        
Principal/Share Amount $ 6,521,000            
Investments, amortized cost 6,439,000            
Investments, fair value $ 6,324,000            
Investment, Identifier [Axis]: Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, 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] whfcl:MaxorAcquisitionInc.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Health Care Services   Health Care Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.46%   10.46%        
Acquisition Date Dec. 27, 2024            
Maturity Date Mar. 01, 2029   Mar. 01, 2029        
Principal/Share Amount $ 947,000            
Investments, amortized cost 938,000            
Investments, fair value $ 938,000            
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 6.00% 6.75% 6.00% 6.75%      
Interest Rate 10.46% 12.48% 10.46% 12.48%      
Acquisition Date Apr. 11, 2023 Apr. 11, 2023          
Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029      
Investments, fair value $ 9,000 $ 9,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 6.00% 6.75% 6.00% 6.75%      
Interest Rate 10.46% 12.48% 10.46% 12.48%      
Acquisition Date Apr. 11, 2023 Apr. 11, 2023          
Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029      
Principal/Share Amount $ 5,002,000 $ 5,053,000          
Investments, amortized cost 4,898,000 4,922,000          
Investments, fair value $ 4,986,000 $ 5,013,000          
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MedicalDeviceIncMember whfcl:MedicalDeviceIncMember          
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 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]      
Floor 1.25% 1.00% 1.25% 1.00%      
Spread Above Index 6.25% 6.50% 6.25% 6.50%      
Interest Rate 10.68% 11.95% 10.68% 11.95%      
Acquisition Date Jul. 27, 2023 Jul. 27, 2023          
Maturity Date Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029      
Investments, fair value $ 6,000 $ 3,000          
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MedicalDeviceIncMember whfcl:MedicalDeviceIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 1.25% 1.00% 1.25% 1.00%      
Spread Above Index 6.25% 6.50% 6.25% 6.50%      
Interest Rate 10.68% 11.95% 10.68% 11.95%      
Acquisition Date Jul. 27, 2023 Jul. 27, 2023          
Maturity Date Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029      
Principal/Share Amount $ 2,633,000 $ 2,660,000          
Investments, amortized cost 2,584,000 2,599,000          
Investments, fair value $ 2,660,000 $ 2,626,000          
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:MerrimanHoldingsLPMember whfcl:MerrimanHoldingsLPMember          
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] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services      
Acquisition Date Apr. 07, 2023 Apr. 07, 2023          
Investment owned shares | shares 327 327 327 327      
Investments, amortized cost $ 333,000 $ 333,000          
Investments, fair value $ 368,000 $ 295,000          
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]: Meta Buyer LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   11.56%   11.56%      
Acquisition Date   Dec. 16, 2021          
Maturity Date   Nov. 01, 2027   Nov. 01, 2027      
Principal/Share Amount   $ 883,000          
Investments, amortized cost   871,000          
Investments, fair value   $ 883,000          
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   11.53%   11.53%      
Acquisition Date   Dec. 16, 2021          
Maturity Date   Nov. 01, 2027   Nov. 01, 2027      
Principal/Share Amount   $ 1,156,000          
Investments, amortized cost   1,141,000          
Investments, fair value   $ 1,161,000          
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Pharmaceuticals [Member]   Pharmaceuticals [Member]      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   9.87%   9.87%      
Acquisition Date   Dec. 16, 2021          
Maturity Date   Nov. 01, 2027   Nov. 01, 2027      
Principal/Share Amount   $ 12,163,000          
Investments, amortized cost   13,552,000          
Investments, fair value   $ 13,401,000          
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   11.46%   11.46%      
Acquisition Date   Dec. 16, 2021          
Maturity Date   Nov. 01, 2027   Nov. 01, 2027      
Principal/Share Amount   $ 971,000          
Investments, amortized cost   959,000          
Investments, fair value   $ 971,000          
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.51%   10.51%        
Acquisition Date Dec. 16, 2021            
Maturity Date Nov. 01, 2027   Nov. 01, 2027        
Principal/Share Amount $ 874,000            
Investments, amortized cost 865,000            
Investments, fair value $ 874,000            
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals [Member]   Pharmaceuticals [Member]        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 8.85%   8.85%        
Acquisition Date Dec. 16, 2021            
Maturity Date Nov. 01, 2027   Nov. 01, 2027        
Principal/Share Amount $ 12,039,000            
Investments, amortized cost 13,449,000            
Investments, fair value $ 12,465,000            
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.48%   10.48%        
Acquisition Date Dec. 16, 2021            
Maturity Date Nov. 01, 2027   Nov. 01, 2027        
Principal/Share Amount $ 962,000            
Investments, amortized cost 952,000            
Investments, fair value $ 962,000            
Investment, Identifier [Axis]: Meta Buyer LLC.,First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.44%   10.44%        
Acquisition Date Dec. 16, 2021            
Maturity Date Nov. 01, 2027   Nov. 01, 2027        
Principal/Share Amount $ 1,156,000            
Investments, amortized cost 1,145,000            
Investments, fair value $ 1,160,000            
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Bridge 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]   Midwest Texas Tea CA, LLC [Member]          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredBridgeLoanMember   whfcl:FirstLienSecuredBridgeLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Distributors   Distributors      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   14.00%   14.00%      
Interest Rate   19.46%   19.46%      
Cash interest rate   13.46%   13.46%      
PIK interest rate   6.00%   6.00%      
Acquisition Date   Dec. 22, 2023          
Maturity Date   Dec. 22, 2025   Dec. 22, 2025      
Principal/Share Amount   $ 1,464,000          
Investments, amortized cost   1,420,000          
Investments, fair value   $ 1,420,000          
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]   false   false      
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      
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      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors      
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 7.25% 7.25% 7.25% 7.25%      
Interest Rate 11.71% 12.71% 11.71% 12.71%      
Acquisition Date Dec. 22, 2023 Dec. 22, 2023          
Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028      
Principal/Share Amount $ 645,000            
Investments, amortized cost 632,000            
Investments, fair value $ 642,000            
Percent of net assets 0.20%   0.20%        
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]: 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      
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      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors      
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.92% 7.25% 6.92% 7.25%      
Interest Rate 12.39% 12.71% 12.39% 12.71%      
Acquisition Date Dec. 22, 2023 Dec. 22, 2023          
Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028      
Principal/Share Amount $ 326,000            
Investments, amortized cost 319,000            
Investments, fair value $ 328,000            
Percent of net assets 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]: 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      
Investment, Issuer Name [Extensible Enumeration] Midwest Texas Tea CA, LLC [Member] Midwest Texas Tea CA, LLC [Member]          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors      
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 7.25% 7.25% 7.25% 7.25%      
Interest Rate 11.71% 12.71% 11.71% 12.71%      
Acquisition Date Dec. 22, 2023 Dec. 22, 2023          
Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028      
Principal/Share Amount $ 9,443,000 $ 9,490,000          
Investments, amortized cost 9,255,000 9,254,000          
Investments, fair value $ 9,399,000 $ 9,254,000          
Percent of net assets 3.30% 2.90% 3.30% 2.90%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:MonarchCollectiveHoldingsLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.50%   1.50%        
Spread Above Index 6.75%   6.75%        
Interest Rate 11.16%   11.16%        
Acquisition Date Jan. 10, 2024            
Maturity Date Jan. 10, 2029   Jan. 10, 2029        
Principal/Share Amount $ 1,596,000            
Investments, amortized cost 1,572,000            
Investments, fair value $ 1,582,000            
Percent of net assets 0.60%   0.60%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:MonarchCollectiveHoldingsLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.50%   1.50%        
Spread Above Index 6.75%   6.75%        
Interest Rate 11.08%   11.08%        
Acquisition Date Jan. 10, 2024            
Maturity Date Jan. 10, 2029   Jan. 10, 2029        
Principal/Share Amount $ 9,306,000            
Investments, amortized cost 9,119,000            
Investments, fair value $ 9,223,000            
Percent of net assets 3.20%   3.20%        
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:MotivationalCIVLLCMember whfcl:MotivationalCIVLLCMember          
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Acquisition Date Jul. 12, 2021 Jul. 12, 2021          
Investment owned shares | shares 1,250 1,250 1,250 1,250      
Investments, amortized cost $ 1,250,000 $ 1,250,000          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:MotivationalMarketingLLCMember whfcl:MotivationalMarketingLLCMember          
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] 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:SecuredOvernightFinancingRateSofrMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 8.50% 7.25% 8.50% 7.25%      
Interest Rate 13.00% 12.71% 13.00% 12.71%      
Cash interest rate 11.00% 11.96% 11.00% 11.96%      
PIK interest rate 2.00% 0.75% 2.00% 0.75%      
Acquisition Date Jul. 12, 2021 Jul. 12, 2021          
Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026      
Principal/Share Amount $ 1,182,000 $ 473,000          
Investments, amortized cost 1,175,000 468,000          
Investments, fair value $ 1,061,000 $ 338,000          
Percent of net assets 0.40% 0.10% 0.40% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:MotivationalMarketingLLCMember whfcl:MotivationalMarketingLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 8.50% 7.25% 8.50% 7.25%      
Interest Rate 12.96% 12.71% 12.96% 12.71%      
Cash interest rate 5.48% 11.96% 5.48% 11.96%      
PIK interest rate 7.48% 0.75% 7.48% 0.75%      
Acquisition Date Jul. 12, 2021 Jul. 12, 2021          
Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026      
Principal/Share Amount $ 10,510,000 $ 9,989,000          
Investments, amortized cost 10,449,000 9,888,000          
Investments, fair value $ 9,438,000 $ 8,790,000          
Percent of net assets 3.20% 2.80% 3.20% 2.80%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:NNAServicesLLCMember whfcl:NNAServicesLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 7.25% 6.75% 7.25% 6.75%      
Interest Rate 11.73% 12.25% 11.73% 12.25%      
Acquisition Date Aug. 27, 2021 Aug. 27, 2021          
Maturity Date Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026      
Principal/Share Amount $ 9,125,000 $ 9,417,000          
Investments, amortized cost 9,087,000 9,354,000          
Investments, fair value $ 8,941,000 $ 9,293,000          
Percent of net assets 3.10% 2.90% 3.10% 2.90%      
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]: NPAV Lessor Corp., First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:NPAVLessorCorp.Member whfcl:NPAVLessorCorp.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] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.50% 6.50% 6.50% 6.50%      
Interest Rate 10.96% 11.96% 10.96% 11.96%      
Acquisition Date Mar. 01, 2022 Mar. 01, 2022          
Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027      
Principal/Share Amount $ 725,000 $ 725,000          
Investments, amortized cost 719,000 716,000          
Investments, fair value $ 660,000 $ 647,000          
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:NPAVLessorCorp.Member          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.50% 6.50% 6.50% 6.50%      
Interest Rate 10.96% 11.96% 10.96% 11.96%      
Acquisition Date Mar. 01, 2022 Mar. 01, 2022          
Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027      
Principal/Share Amount $ 6,502,000 $ 7,510,000          
Investments, amortized cost 6,448,000 7,418,000          
Investments, fair value $ 5,918,000 $ 6,706,000          
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:NavigaIncMember whfcl:NavigaIncMember          
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] 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]      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.84% 6.84% 6.84% 6.84%      
Interest Rate 12.78% 12.78% 12.78% 12.78%      
Acquisition Date Jun. 14, 2019 Jun. 14, 2019          
Maturity Date Jun. 28, 2024 Feb. 27, 2024 Jun. 28, 2024 Feb. 27, 2024      
Principal/Share Amount $ 301,000 $ 271,000          
Investments, amortized cost 301,000 271,000          
Investments, fair value $ 169,000 $ 268,000          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:NavigaIncMember whfcl:NavigaIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software      
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 7.00% 7.00% 7.00% 7.00%      
Interest Rate 12.40% 12.45% 12.40% 12.45%      
Acquisition Date Jun. 14, 2019 Jun. 14, 2019          
Maturity Date Jun. 28, 2024 Feb. 27, 2024 Jun. 28, 2024 Feb. 27, 2024      
Principal/Share Amount $ 3,140,000 $ 3,148,000          
Investments, amortized cost 3,140,000 3,148,000          
Investments, fair value $ 1,763,000 $ 3,113,000          
Percent of net assets 0.60% 1.00% 0.60% 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]: 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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:NewAmericanCraftsHoldingsLlcMember whfcl:NewAmericanCraftsHoldingsLlcClassaUnitsMember          
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] Leisure Products Leisure Products Leisure Products Leisure Products      
Acquisition Date Mar. 16, 2023 Mar. 16, 2023          
Investment owned shares | shares 1 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]: PANOS Brands, 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] Panos Brands, Llc [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats   Packaged Foods & Meats        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.15%   10.15%        
Acquisition Date May 14, 2024            
Maturity Date May 14, 2029   May 14, 2029        
Principal/Share Amount $ 27,000            
Investments, amortized cost 27,000            
Investments, fair value $ 33,000            
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]: PANOS Brands, LLC First Lien Secured Revolving Loan, One 05/14/29              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
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        
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 5.75%   5.75%        
Interest Rate 10.15%   10.15%        
Acquisition Date Jun. 14, 2024            
Maturity Date May 14, 2029   May 14, 2029        
Principal/Share Amount $ 30,000            
Investments, amortized cost 30,000            
Investments, fair value $ 36,000            
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]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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        
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 5.75%   5.75%        
Interest Rate 10.13%   10.13%        
Acquisition Date Jun. 14, 2024            
Maturity Date May 14, 2029   May 14, 2029        
Principal/Share Amount $ 4,520,000            
Investments, amortized cost 4,441,000            
Investments, fair value $ 4,505,000            
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan, One 05/14/29              
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] Panos Brands, Llc [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats   Packaged Foods & Meats        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.13%   10.13%        
Acquisition Date May 14, 2024            
Maturity Date May 14, 2029   May 14, 2029        
Principal/Share Amount $ 4,068,000            
Investments, amortized cost 3,997,000            
Investments, fair value $ 4,054,000            
Percent of net assets 1.40%   1.40%        
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]: 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:PfbHoldingCompanyLlcMember          
Investment, Type [Extensible Enumeration]   whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Building Products   Building Products      
Acquisition Date   Dec. 17, 2021          
Investment owned shares | shares   1   1      
Investments, amortized cost   $ 423,000          
Investments, fair value   $ 1,053,000          
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]: PFB Holding Company, 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:PFBHoldcoIncMember            
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Building Products   Building Products        
Acquisition Date Dec. 17, 2021            
Investment owned shares | shares 1   1        
Investments, amortized cost $ 24,000            
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]: PG Dental New Jersey Parent, 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:PGDentalNewJerseyParentLLCMember          
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 Services   Health Care Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]   Base Rate [Member]      
Floor   1.00%   1.00%      
Spread Above Index   7.00%   7.00%      
Interest Rate   13.98%   13.98%      
Cash interest rate   11.73%   11.73%      
PIK interest rate   2.25%   2.25%      
Acquisition Date   Nov. 25, 2020          
Maturity Date   Nov. 25, 2025   Nov. 25, 2025      
Principal/Share Amount   $ 704,000          
Investments, amortized cost   698,000          
Investments, fair value   $ 704,000          
Percent of net assets   0.20%   0.20%      
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]: PG Dental New Jersey Parent, 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:PGDentalNewJerseyParentLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Health Care Services   Health Care Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   12.96%   12.96%      
Cash interest rate   10.71%   10.71%      
PIK interest rate   2.25%   2.25%      
Acquisition Date   Nov. 25, 2020          
Maturity Date   Nov. 25, 2025   Nov. 25, 2025      
Principal/Share Amount   $ 6,400,000          
Investments, amortized cost   6,348,000          
Investments, fair value   $ 6,400,000          
Percent of net assets   2.00%   2.00%      
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]: 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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
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 $ 889,000            
Investments, amortized cost 867,000            
Investments, fair value $ 916,000            
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] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
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 $ 7,950,000            
Investments, amortized cost 7,757,000            
Investments, fair value $ 8,188,000            
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 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] whfcl:PatagoniaHoldcoLLCMember whfcl:PatagoniaHoldcoLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 0.50% 0.50% 0.50% 0.50%      
Spread Above Index 5.75% 5.75% 5.75% 5.75%      
Interest Rate 10.27% 11.12% 10.27% 11.12%      
Acquisition Date Aug. 05, 2022 Aug. 05, 2022          
Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029      
Principal/Share Amount $ 14,296,000 $ 14,442,000          
Investments, amortized cost 12,602,000 12,357,000          
Investments, fair value $ 13,135,000 $ 13,191,000          
Percent of net assets 4.60% 4.20% 4.60% 4.20%      
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]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember          
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.42% 11.23% 12.42%      
Acquisition Date Mar. 17, 2023 Mar. 17, 2023          
Maturity Date Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028      
Principal/Share Amount $ 569,000 $ 575,000          
Investments, amortized cost 558,000 560,000          
Investments, fair value $ 569,000 $ 569,000          
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember          
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.42% 11.23% 12.42%      
Acquisition Date Mar. 17, 2023 Mar. 17, 2023          
Maturity Date Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028      
Principal/Share Amount $ 338,000            
Investments, amortized cost 331,000            
Investments, fair value $ 341,000 $ 5,000          
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.27% 11.23% 12.27%      
Acquisition Date Mar. 17, 2023 Mar. 17, 2023          
Maturity Date Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028      
Principal/Share Amount $ 5,117,000 $ 4,455,000          
Investments, amortized cost 5,015,000 4,344,000          
Investments, fair value $ 5,111,000 $ 4,405,000          
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PennsylvaniaMachineWorksLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components      
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   6.00%   6.00%      
Interest Rate   11.61%   11.61%      
Acquisition Date   Mar. 25, 2022          
Maturity Date   Mar. 08, 2027   Mar. 08, 2027      
Principal/Share Amount   $ 6,561,000          
Investments, amortized cost   6,498,000          
Investments, fair value   $ 6,561,000          
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      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 5.50% 5.75% 5.50% 5.75%      
Interest Rate 9.95% 11.20% 9.95% 11.20%      
Acquisition Date Oct. 31, 2023 Oct. 31, 2023          
Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028      
Investments, fair value $ 17,000            
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 5.50% 5.75% 5.50% 5.75%      
Interest Rate 9.95% 11.20% 9.95% 11.20%      
Acquisition Date Oct. 31, 2023 Oct. 31, 2023          
Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028      
Principal/Share Amount $ 7,425,000 $ 7,500,000          
Investments, amortized cost 7,298,000 7,337,000          
Investments, fair value $ 7,425,000 $ 7,337,000          
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investments, fair value   $ 1,363,000         2,977,000
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 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 Jan. 24, 2022          
Investment owned shares | shares 72 72 72 72      
Investments, amortized cost $ 460,000 $ 460,000          
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 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      
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      
Interest Rate 14.00% 14.00% 14.00% 14.00%      
PIK interest rate 14.00% 14.00% 14.00% 14.00%      
Acquisition Date Jan. 24, 2022 Jan. 24, 2022          
Investment owned shares | shares 36 36 36 36      
Investments, amortized cost $ 3,600,000 $ 3,600,000          
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]: 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 affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupLLCMember whfcl:PlayMonsterLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [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, 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 9.00% 9.00% 9.00% 9.00%      
PIK interest rate 13.74% 14.53% 13.74% 14.53%      
Acquisition Date Jun. 07, 2021 Jun. 07, 2021          
Maturity Date Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026      
Principal/Share Amount $ 4,890,000 $ 4,232,000          
Investments, amortized cost 3,661,000 3,661,000          
Investments, fair value $ 1,635,000 $ 1,363,000          
Percent of net assets 0.60% 0.40% 0.60% 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]: 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 affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupLLCMember whfcl:PlayMonsterLLCMember          
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember      
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, 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 6.75% 6.75% 6.75% 6.75%      
PIK interest rate 11.41% 12.37% 11.41% 12.37%      
Acquisition Date Dec. 09, 2022 Dec. 09, 2022          
Maturity Date Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026 Jun. 08, 2026      
Principal/Share Amount $ 1,289,000 $ 1,140,000          
Investments, amortized cost 1,275,000 1,118,000          
Investments, fair value $ 1,172,000 $ 1,015,000         176,000
Percent of net assets 0.40% 0.30% 0.40% 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]: Potpourri Group, 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:PotpourriGroupIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Broadline Retail   Broadline Retail      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.50%   1.50%      
Spread Above Index   8.25%   8.25%      
Interest Rate   13.71%   13.71%      
Acquisition Date   Jul. 03, 2019          
Maturity Date   Jul. 03, 2024   Jul. 03, 2024      
Principal/Share Amount   $ 13,799,000          
Investments, amortized cost   13,767,000          
Investments, fair value   $ 13,799,000          
Percent of net assets   4.40%   4.40%      
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]: Poultry Holdings LLC., First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:PoultryHoldingsLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Acquisition Date   Oct. 21, 2019          
Maturity Date   Jun. 28, 2025   Jun. 28, 2025      
Principal/Share Amount   $ 6,939,000          
Investments, amortized cost   6,904,000          
Investments, fair value   $ 6,904,000          
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:PowerServiceGroupCrAcquisitionIncMember whfcl:PowerServiceGroupCrAcquisitionIncMember          
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] 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:SecuredOvernightFinancingRateSofrMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.25% 11.23% 12.25%      
Acquisition Date Jul. 11, 2022 Jul. 11, 2022          
Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026      
Principal/Share Amount $ 1,340,000 $ 1,356,000          
Investments, amortized cost 1,329,000 1,336,000          
Investments, fair value $ 1,354,000 $ 1,353,000          
Percent of net assets 0.50% 0.40% 0.50% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:PowerServiceGroupCrAcquisitionIncMember whfcl:PowerServiceGroupCrAcquisitionIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 6.75% 6.75% 6.75% 6.75%      
Interest Rate 11.23% 12.25% 11.23% 12.25%      
Acquisition Date Jun. 25, 2021 Jun. 25, 2021          
Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026      
Principal/Share Amount $ 8,697,000 $ 8,804,000          
Investments, amortized cost 8,642,000 8,712,000          
Investments, fair value $ 8,784,000 $ 8,782,000          
Percent of net assets 3.10% 2.80% 3.10% 2.80%      
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]: 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 affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] Pressurized Holdings, LLC [Member] Pressurized Holdings, LLC [Member]          
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] 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      
Investment, Significant Unobservable Input [true false] true true true true      
Investment, Non-income Producing [true false] false false false false      
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 affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] Pressurized Holdings, LLC [Member] Pressurized Holdings, LLC [Member]          
Investment, Type [Extensible Enumeration] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Diversified Chemicals Diversified Chemicals Diversified Chemicals Diversified Chemicals      
Interest Rate 14.00%   14.00%        
PIK interest rate 14.00% 14.00% 14.00% 14.00%      
Acquisition Date Mar. 16, 2023 Mar. 16, 2023          
Investments, amortized cost $ 4,537,000 $ 4,537,000          
Investments, fair value $ 1,657,000 $ 251,000          
Percent of net assets 0.60% 0.10% 0.60% 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]: 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] Electronic Equipment & Instruments   Electronic Equipment & Instruments        
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            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Electronic Equipment & Instruments   Electronic Equipment & Instruments        
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        
Principal/Share Amount $ 3,531,000            
Investments, amortized cost 3,479,000            
Investments, fair value $ 3,479,000            
Investment, Identifier [Axis]: Project Castle, 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:ProjectCastleIncMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   0.50%   0.50%      
Spread Above Index   5.50%   5.50%      
Interest Rate   10.89%   10.89%      
Acquisition Date   Jun. 09, 2022          
Maturity Date   Jun. 01, 2029   Jun. 01, 2029      
Principal/Share Amount   $ 6,027,000          
Investments, amortized cost   5,536,000          
Investments, fair value   $ 5,364,000          
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]: Quest Events LLC, First Lien Secured Term Loan, 09/30/26              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 2.00%   2.00%        
Spread Above Index 7.00%   7.00%        
Interest Rate 11.59%   11.59%        
Acquisition Date Jul. 19, 2019            
Maturity Date Sep. 30, 2026   Sep. 30, 2026        
Principal/Share Amount $ 11,592,000            
Investments, amortized cost 11,563,000            
Investments, fair value $ 11,592,000            
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember          
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember      
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      
Acquisition Date Dec. 28, 2018 Dec. 28, 2018          
Investment owned shares | shares 333 317 333 317      
Investments, amortized cost $ 376,000 $ 360,000          
Investments, fair value $ 149,000 $ 305,000          
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              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember          
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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%      
Spread Above Index 7.00% 7.25% 7.00% 7.25%      
Interest Rate 11.59% 12.86% 11.59% 12.86%      
Acquisition Date Jul. 19, 2019 Jul. 19, 2019          
Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026      
Principal/Share Amount $ 247,000 $ 247,000          
Investments, amortized cost 246,000 246,000          
Investments, fair value $ 248,000 $ 242,000          
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        
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
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] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Floor 1.00% 2.00% 1.00% 2.00%      
Spread Above Index 6.50% 7.25% 6.50% 7.25%      
Interest Rate 10.90% 12.86% 10.90% 12.86%      
Acquisition Date Sep. 13, 2024 Jul. 19, 2019          
Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026      
Principal/Share Amount $ 480,000 $ 11,709,000          
Investments, amortized cost 472,000 11,663,000          
Investments, fair value $ 473,000 $ 11,557,000          
Percent of net assets 0.20%   0.20%        
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]: 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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% 6.00% 5.25% 6.00%      
Interest Rate 9.99% 11.53% 9.99% 11.53%      
Acquisition Date Jan. 27, 2021 Jan. 27, 2021          
Maturity Date Jan. 02, 2029 Dec. 31, 2026 Jan. 02, 2029 Dec. 31, 2026      
Principal/Share Amount $ 2,946,000 $ 2,976,000          
Investments, amortized cost 2,922,000 2,945,000          
Investments, fair value $ 2,946,000 $ 2,965,000          
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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% 6.00% 5.25% 6.00%      
Interest Rate 9.73% 11.50% 9.73% 11.50%      
Acquisition Date Jan. 27, 2021 Jan. 27, 2021          
Maturity Date Jan. 02, 2029 Dec. 31, 2026 Jan. 02, 2029 Dec. 31, 2026      
Principal/Share Amount $ 10,923,000 $ 11,036,000          
Investments, amortized cost 10,839,000 10,925,000          
Investments, fair value $ 10,923,000 $ 10,993,000          
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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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% 6.00% 5.25% 6.00%      
Interest Rate 9.99% 11.58% 9.99% 11.58%      
Acquisition Date Jan. 27, 2021 Jan. 27, 2021          
Maturity Date Jan. 02, 2029 Dec. 31, 2026 Jan. 02, 2029 Dec. 31, 2026      
Principal/Share Amount   $ 107,000          
Investments, amortized cost   106,000          
Investments, fair value $ 11,000 $ 114,000          
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            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.25%   6.25%        
Interest Rate 10.71%   10.71%        
Acquisition Date Jan. 23, 2024            
Maturity Date Dec. 31, 2026   Dec. 31, 2026        
Principal/Share Amount $ 6,659,000            
Investments, amortized cost 6,566,000            
Investments, fair value $ 6,637,000            
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        
Investment, Issuer Name [Extensible Enumeration] Ribbon Communications Operating Company, 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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.25%   6.25%        
Interest Rate 10.59%   10.59%        
Acquisition Date Jun. 21, 2024            
Maturity Date Jun. 21, 2029   Jun. 21, 2029        
Investments, fair value $ 9,000            
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Ribbon Communications Operating Company, Inc. [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.25%   6.25%        
Interest Rate 10.59%   10.59%        
Acquisition Date Jun. 21, 2024            
Maturity Date Jun. 21, 2029   Jun. 21, 2029        
Principal/Share Amount $ 8,756,000            
Investments, amortized cost 8,600,000            
Investments, fair value $ 8,692,000            
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:Ross-SimonsTopcoLPMember whfcl:Ross-SimonsTopcoLPMember          
Investment, Type [Extensible Enumeration] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail      
Interest Rate 8.00% 8.00% 8.00% 8.00%      
PIK interest rate 8.00% 8.00% 8.00% 8.00%      
Acquisition Date Dec. 04, 2020 Dec. 04, 2020          
Investment owned shares | shares 600 600 600 600      
Investments, amortized cost $ 514,000 $ 514,000          
Investments, fair value $ 756,000 $ 832,000          
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]: SFS Global Holding Company Warrants              
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:SFSGlobalHoldingCompanyMember          
Investment, Type [Extensible Enumeration]   Warrant [Member]   Warrant [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Other Diversified Financial Services   Other Diversified Financial Services      
Acquisition Date   Jun. 28, 2018          
Maturity Date   Dec. 28, 2025   Dec. 28, 2025      
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]: Salon Republic Holdings, LLC (d/b/a Salon Republic, 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] whfcl:SalonRepublicHoldingsLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services   Specialized Consumer Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.00%   8.00%        
Interest Rate 12.46%   12.46%        
Acquisition Date Dec. 02, 2022            
Maturity Date Dec. 02, 2027   Dec. 02, 2027        
Principal/Share Amount $ 1,669,000            
Investments, amortized cost 1,641,000            
Investments, fair value $ 1,672,000            
Percent of net assets 0.60%   0.60%        
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]: Salon Republic Holdings, LLC (d/b/a Salon Republic, 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:SalonRepublicHoldingsLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services   Specialized Consumer Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.00%   8.00%        
Interest Rate 12.46%   12.46%        
Acquisition Date Dec. 02, 2022            
Maturity Date Dec. 02, 2027   Dec. 02, 2027        
Investments, fair value $ 13,000            
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]: Salon Republic Holdings, LLC (d/b/a Salon Republic, 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:SalonRepublicHoldingsLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services   Specialized Consumer Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 8.00%   8.00%        
Interest Rate 12.46%   12.46%        
Acquisition Date Dec. 02, 2022            
Maturity Date Dec. 02, 2027   Dec. 02, 2027        
Principal/Share Amount $ 5,076,000            
Investments, amortized cost 4,988,000            
Investments, fair value $ 5,063,000            
Percent of net assets 1.80%   1.80%        
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]: 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   12.96%   12.96%      
Acquisition Date   Dec. 02, 2022          
Maturity Date   Dec. 02, 2027   Dec. 02, 2027      
Principal/Share Amount   $ 741,000          
Investments, amortized cost   729,000          
Investments, fair value   $ 745,000          
Percent of net assets   0.20%   0.20%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Spread Above Index   7.50%   7.50%      
Interest Rate   12.96%   12.96%      
Acquisition Date   Dec. 02, 2022          
Maturity Date   Dec. 02, 2027   Dec. 02, 2027      
Principal/Share Amount   $ 251,000          
Investments, amortized cost   245,000          
Investments, fair value   $ 258,000          
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]   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      
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   12.96%   12.96%      
Acquisition Date   Dec. 02, 2022          
Maturity Date   Dec. 02, 2027   Dec. 02, 2027      
Principal/Share Amount   $ 5,121,000          
Investments, amortized cost   5,001,000          
Investments, fair value   $ 5,077,000          
Percent of net assets   1.60%   1.60%      
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]: 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      
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   $ 400,000          
Investments, fair value   $ 241,000          
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]   false   false      
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      
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      
PIK interest rate   8.00%   8.00%      
Acquisition Date   Dec. 02, 2022          
Investment owned shares | shares   200   200      
Investments, amortized cost   $ 200,000          
Investments, fair value   $ 218,000          
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        
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] Real Estate Operating Companies   Real Estate Operating Companies        
Acquisition Date Dec. 02, 2022            
Investment owned shares | shares 400   400        
Investments, amortized cost $ 400,000            
Investments, fair value $ 132,000            
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]: 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        
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] Real Estate Operating Companies   Real Estate Operating Companies        
Interest Rate 8.00%   8.00%        
PIK interest rate 8.00%   8.00%        
Acquisition Date Dec. 02, 2022            
Investment owned shares | shares 200   200        
Investments, amortized cost $ 200,000            
Investments, fair value $ 242,000            
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]: Sigue Corporation Warrants              
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:SigueCorporationMember          
Investment, Type [Extensible Enumeration]   Warrant [Member]   Warrant [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Other Diversified Financial Services   Other Diversified Financial Services      
Acquisition Date   Jun. 28, 2018          
Maturity Date   Dec. 28, 2025   Dec. 28, 2025      
Investment owned shares | shares   22   22      
Investments, amortized cost   $ 2,890,000          
Investments, fair value   $ 3,472,000          
Percent of net assets   1.10%   1.10%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:SleepOpCoLLCMember whfcl:SleepOpCoLLCMember          
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] Home Furnishings Home Furnishings Home Furnishings Home Furnishings      
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 11.28% 12.07% 11.28% 12.07%      
Acquisition Date Oct. 12, 2021 Oct. 12, 2021          
Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026      
Investments, fair value $ 5,000 $ 3,000          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:SleepOpCoLLCMember whfcl:SleepOpCoLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Home Furnishings Home Furnishings Home Furnishings Home Furnishings      
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 11.28% 12.07% 11.28% 12.07%      
Acquisition Date Oct. 12, 2021 Oct. 12, 2021          
Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026      
Principal/Share Amount $ 22,590,000 $ 20,616,000          
Investments, amortized cost 22,401,000 20,385,000          
Investments, fair value $ 22,441,000 $ 20,407,000          
Percent of net assets 7.80% 6.40% 7.80% 6.40%      
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]: Smalto Inc, First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:SmaltoInc.Member            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Household Appliances   Household Appliances        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 8.86%   8.86%        
Acquisition Date May 04, 2022            
Maturity Date Apr. 28, 2028   Apr. 28, 2028        
Principal/Share Amount $ 6,423,000            
Investments, amortized cost 6,682,000            
Investments, fair value $ 6,654,000            
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan Interest Rate 10.18              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Household Appliances   Household Appliances      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember      
Floor   1.00%   1.00%      
Spread Above Index   6.25%   6.25%      
Interest Rate   10.18%   10.18%      
Acquisition Date   May 04, 2022          
Maturity Date   Apr. 28, 2028   Apr. 28, 2028      
Principal/Share Amount   $ 6,576,000          
Investments, amortized cost   6,821,000          
Investments, fair value   $ 7,172,000          
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan Interest Rate 11.50              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.00%   6.00%      
Interest Rate   11.50%   11.50%      
Acquisition Date   May 04, 2022          
Maturity Date   Apr. 28, 2028   Apr. 28, 2028      
Principal/Share Amount   $ 1,001,000          
Investments, amortized cost   987,000          
Investments, fair value   $ 996,000          
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:SmaltoInc.Member            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.75%   5.75%        
Interest Rate 10.21%   10.21%        
Acquisition Date May 04, 2022            
Maturity Date Apr. 28, 2028   Apr. 28, 2028        
Principal/Share Amount $ 978,000            
Investments, amortized cost 967,000            
Investments, fair value $ 978,000            
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      
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      
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      
Acquisition Date Jun. 29, 2020 Jun. 29, 2020          
Investment owned shares | shares 2 2 2 2      
Investments, amortized cost $ 1,941,000 $ 1,941,000          
Investments, fair value $ 173,000 $ 130,000          
Percent of net assets 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:SnapFitnessHoldingsIncMember whfcl:SnapFitnessHoldingsIncMember          
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember whfcl:FirstLienSecuredTermLoanCMember      
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      
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          
Principal/Share Amount $ 1,822,000 $ 1,657,000          
Investments, amortized cost 1,819,000 1,654,000          
Investments, fair value $ 1,790,000 $ 1,623,000          
Percent of net assets 0.60% 0.50% 0.60% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:SnapFitnessHoldingsIncMember whfcl:SnapFitnessHoldingsIncMember          
Investment, Type [Extensible Enumeration] Warrant [Member] Warrant [Member] Warrant [Member] Warrant [Member]      
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      
Acquisition Date Jun. 29, 2020 Jun. 29, 2020          
Investment owned shares | shares 1 1 1 1      
Investments, amortized cost $ 793,000 $ 793,000          
Investments, fair value $ 70,000 $ 53,000          
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]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:CanadianDollarOfferedRateMember   whfcl:CanadianDollarOfferedRateMember      
Floor   0.50%   0.50%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.94%   11.94%      
Acquisition Date   Mar. 23, 2023          
Maturity Date   Sep. 28, 2029   Sep. 28, 2029      
Principal/Share Amount   $ 3,873,000          
Investments, amortized cost   2,759,000          
Investments, fair value   $ 2,892,000          
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SOFR              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   0.50%   0.50%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.85%   11.85%      
Acquisition Date   Mar. 23, 2023          
Maturity Date   Sep. 28, 2029   Sep. 28, 2029      
Principal/Share Amount   $ 2,807,000          
Investments, amortized cost   2,744,000          
Investments, fair value   $ 2,786,000          
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]      
Floor   0.00%   0.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.72%   11.72%      
Acquisition Date   Mar. 23, 2023          
Maturity Date   Sep. 28, 2029   Sep. 28, 2029      
Principal/Share Amount   $ 171,000          
Investments, amortized cost   205,000          
Investments, fair value   $ 217,000          
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan CDOR              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:CanadianDollarOfferedRateMember   whfcl:CanadianDollarOfferedRateMember      
Floor   0.50%   0.50%      
Spread Above Index   6.50%   6.50%      
Interest Rate   12.08%   12.08%      
Acquisition Date   Mar. 23, 2023          
Maturity Date   Sep. 28, 2029   Sep. 28, 2029      
Principal/Share Amount   $ 458,000          
Investments, amortized cost   324,000          
Investments, fair value   $ 342,000          
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan SOFR              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   0.50%   0.50%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.85%   11.85%      
Acquisition Date   Mar. 23, 2023          
Maturity Date   Sep. 28, 2029   Sep. 28, 2029      
Principal/Share Amount   $ 368,000          
Investments, amortized cost   360,000          
Investments, fair value   $ 366,000          
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan SONIA              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]      
Floor   0.00%   0.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.71%   11.71%      
Acquisition Date   Mar. 23, 2023          
Maturity Date   Sep. 28, 2029   Sep. 28, 2029      
Principal/Share Amount   $ 723,000          
Investments, amortized cost   882,000          
Investments, fair value   $ 984,000          
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          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   Aug. 10, 2021          
Maturity Date   Jul. 30, 2027   Jul. 30, 2027      
Principal/Share Amount   $ 4,088,000          
Investments, amortized cost   4,039,000          
Investments, fair value   $ 4,047,000          
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SourceCodeHoldingsLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   Aug. 10, 2021          
Maturity Date   Jul. 30, 2027   Jul. 30, 2027      
Principal/Share Amount   $ 14,952,000          
Investments, amortized cost   14,772,000          
Investments, fair value   $ 14,806,000          
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            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.96%   10.96%        
Acquisition Date Aug. 10, 2021            
Maturity Date Jul. 30, 2027   Jul. 30, 2027        
Principal/Share Amount $ 3,872,000            
Investments, amortized cost 3,839,000            
Investments, fair value $ 3,854,000            
Investment, Identifier [Axis]: Source Code Holdings, LLC., First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:SourceCodeHoldingsLLCMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.96%   10.96%        
Acquisition Date Aug. 10, 2021            
Maturity Date Jul. 30, 2027   Jul. 30, 2027        
Principal/Share Amount $ 14,162,000            
Investments, amortized cost 14,041,000            
Investments, fair value $ 14,095,000            
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:SterlingPureBlockerLlcMember whfcl:SterlingPureBlockerLlcMember          
Investment, Type [Extensible Enumeration] whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember whfcl:ClassBUnitsMember      
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      
Acquisition Date Dec. 01, 2023 Dec. 01, 2023          
Investment owned shares | shares 404 404 404 404      
Investments, amortized cost $ 404,000 $ 404,000          
Investments, fair value $ 388,000 $ 404,000          
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]: StoicLane MidCo, 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]   whfcl:StoiclaneMidcoLlcMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   13.00%   13.00%      
Acquisition Date   Nov. 04, 2022          
Maturity Date   Nov. 04, 2027   Nov. 04, 2027      
Principal/Share Amount   $ 5,545,000          
Investments, amortized cost   5,466,000          
Investments, fair value   $ 5,633,000          
Percent of net assets   1.80%   1.80%      
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]: StoicLane MidCo, 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:StoiclaneMidcoLlcMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.50%   7.50%      
Interest Rate   13.00%   13.00%      
Acquisition Date   Nov. 04, 2022          
Maturity Date   Nov. 04, 2027   Nov. 04, 2027      
Principal/Share Amount   $ 4,606,000          
Investments, amortized cost   4,518,000          
Investments, fair value   $ 4,606,000          
Percent of net assets   1.50%   1.50%      
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]: Sunless, Inc. First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SunlessInc.Member          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.75%   6.75%      
Interest Rate   12.21%   12.21%      
Acquisition Date   Oct. 21, 2019          
Maturity Date   Aug. 13, 2025   Aug. 13, 2025      
Principal/Share Amount   $ 488,000          
Investments, amortized cost   485,000          
Investments, fair value   $ 484,000          
Investment, Identifier [Axis]: Sunless, Inc. First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:SunlessInc.Member          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   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]      
Floor   1.00%   1.00%      
Spread Above Index   6.75%   6.75%      
Interest Rate   12.20%   12.20%      
Acquisition Date   Oct. 21, 2019          
Maturity Date   Aug. 13, 2025   Aug. 13, 2025      
Principal/Share Amount   $ 5,507,000          
Investments, amortized cost   5,459,000          
Investments, fair value   $ 5,473,000          
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        
Investment, Issuer Name [Extensible Enumeration] Surge Amuze Holdings Inc [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.46%   10.46%        
Acquisition Date Sep. 06, 2024            
Maturity Date Sep. 06, 2029   Sep. 06, 2029        
Principal/Share Amount $ 584,000            
Investments, amortized cost 573,000            
Investments, fair value $ 577,000            
Percent of net assets 0.20%   0.20%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Surge Amuze Holdings 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] Leisure Products   Leisure Products        
Investment, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember   us-gaap:PrimeRateMember        
Floor 1.00%   1.00%        
Spread Above Index 5.00%   5.00%        
Interest Rate 12.50%   12.50%        
Acquisition Date Sep. 06, 2024            
Maturity Date Sep. 06, 2029   Sep. 06, 2029        
Principal/Share Amount $ 585,000            
Investments, amortized cost 574,000            
Investments, fair value $ 576,000            
Percent of net assets 0.20%   0.20%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Surge Amuze Holdings Inc [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.00%   6.00%        
Interest Rate 10.44%   10.44%        
Acquisition Date Sep. 06, 2024            
Maturity Date Sep. 06, 2029   Sep. 06, 2029        
Principal/Share Amount $ 5,737,000            
Investments, amortized cost 5,629,000            
Investments, fair value $ 5,643,000            
Percent of net assets 2.00%   2.00%        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Tot Group, Inc. [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services   Transaction & Payment Processing Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 7.50%   7.50%        
Interest Rate 11.83%   11.83%        
Acquisition Date Jun. 28, 2024            
Maturity Date Jun. 28, 2029   Jun. 28, 2029        
Investments, fair value $ (1,000)            
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Tot Group, 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] Transaction & Payment Processing Services   Transaction & Payment Processing Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 7.50%   7.50%        
Interest Rate 11.83%   11.83%        
Acquisition Date Jun. 28, 2024            
Maturity Date Jun. 28, 2029   Jun. 28, 2029        
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]: 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        
Investment, Issuer Name [Extensible Enumeration] Tot Group, Inc. [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services   Transaction & Payment Processing Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 7.50%   7.50%        
Interest Rate 11.83%   11.83%        
Acquisition Date Jun. 28, 2024            
Maturity Date Jun. 28, 2029   Jun. 28, 2029        
Principal/Share Amount $ 8,239,000            
Investments, amortized cost 8,074,000            
Investments, fair value $ 8,067,000            
Percent of net assets 2.80%   2.80%        
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]: TOUR Intermediate Holdings, LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TOURIntermediateHoldingsLLCMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Investment Banking & Brokerage   Investment Banking & Brokerage      
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   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   May 19, 2020          
Maturity Date   May 15, 2025   May 15, 2025      
Principal/Share Amount   $ 2,320,000          
Investments, amortized cost   2,315,000          
Investments, fair value   $ 2,320,000          
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration]   whfcl:TOURIntermediateHoldingsLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Investment Banking & Brokerage   Investment Banking & Brokerage      
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   6.50%   6.50%      
Interest Rate   11.96%   11.96%      
Acquisition Date   May 19, 2020          
Maturity Date   May 15, 2025   May 15, 2025      
Principal/Share Amount   $ 2,657,000          
Investments, amortized cost   2,643,000          
Investments, fair value   $ 2,657,000          
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:TabletrustBrandsLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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        
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 5.75%   5.75%        
Interest Rate 10.22%   10.22%        
Acquisition Date Dec. 24, 2024            
Maturity Date Jun. 28, 2028   Jun. 28, 2028        
Principal/Share Amount $ 2,505,000            
Investments, amortized cost 2,468,000            
Investments, fair value $ 2,468,000            
Investment, Identifier [Axis]: Team Car Care Holdings, 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:TeamCarCareHoldingsLLCMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration]   Automotive Retail   Automotive Retail      
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]   Base Rate [Member]      
Floor   1.00%   1.00%      
Spread Above Index   7.48%   7.48%      
Interest Rate   13.09%   13.09%      
Acquisition Date   Feb. 16, 2018          
Maturity Date   Dec. 31, 2024   Dec. 31, 2024      
Principal/Share Amount   $ 12,407,000          
Investments, amortized cost   12,391,000          
Investments, fair value   $ 12,407,000          
Percent of net assets   3.90%   3.90%      
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]: 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      
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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 1.00%   1.00%        
Spread Above Index 9.75% 11.75% 9.75% 11.75%      
Interest Rate   17.21%   17.21%      
PIK interest rate 14.21%   14.21%        
Acquisition Date Oct. 15, 2020 Oct. 15, 2020          
Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025      
Principal/Share Amount $ 1,116,000 $ 1,242,000          
Investments, amortized cost 1,051,000 1,228,000          
Investments, fair value $ 1,009,000 $ 1,223,000          
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]: 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      
Investment, Issuer Name [Extensible Enumeration] Telestream Holdings Corporation [Member] Telestream Holdings Corporation [Member]          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 9.75% 11.75% 9.75% 11.75%      
Interest Rate   17.28%   17.28%      
PIK interest rate 14.21%   14.21%        
Acquisition Date Oct. 15, 2020 Oct. 15, 2020          
Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025      
Principal/Share Amount $ 18,547,000 $ 15,763,000          
Investments, amortized cost 17,496,000 15,580,000          
Investments, fair value $ 17,063,000 $ 15,522,000          
Percent of net assets 5.90% 4.90% 5.90% 4.90%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:TheKyjenCompanyLLCMember whfcl:TheKyjenCompanyLLCMember          
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] Household Products Household Products Household Products Household 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 6.50% 7.50% 6.50% 7.50%      
Interest Rate 10.97% 13.21% 10.97% 13.21%      
Cash interest rate 10.22% 12.21% 10.22% 12.21%      
PIK interest rate 0.75% 1.00% 0.75% 1.00%      
Acquisition Date Apr. 05, 2021 Apr. 05, 2021          
Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026      
Principal/Share Amount $ 798,000            
Investments, amortized cost 795,000            
Investments, fair value $ 761,000 $ (31,000)          
Percent of net assets 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:TheKyjenCompanyLLCMember whfcl:TheKyjenCompanyLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Household Products Household Products Household Products Household 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 7.25% 7.50% 7.25% 7.50%      
Interest Rate 12.05% 13.21% 12.05% 13.21%      
Cash interest rate 11.30% 12.21% 11.30% 12.21%      
PIK interest rate 0.75% 1.00% 0.75% 1.00%      
Acquisition Date Apr. 05, 2021 Apr. 05, 2021          
Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026      
Principal/Share Amount $ 11,350,000 $ 11,358,000          
Investments, amortized cost 11,309,000 11,282,000          
Investments, fair value $ 10,895,000 $ 10,904,000          
Percent of net assets 3.80% 3.40% 3.80% 3.40%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:TokenBuyerIncMember whfcl:TokenBuyerIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 0.50% 0.50% 0.50% 0.50%      
Spread Above Index 6.00% 6.00% 6.00% 6.00%      
Interest Rate 10.74% 11.53% 10.74% 11.53%      
Acquisition Date May 26, 2022 May 26, 2022          
Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029      
Principal/Share Amount $ 7,070,000 $ 7,142,000          
Investments, amortized cost 6,709,000 6,695,000          
Investments, fair value $ 5,658,000 $ 5,966,000          
Percent of net assets 2.00% 1.90% 2.00% 1.90%      
Investment, Restriction Status [true false] 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]: 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]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.82%   9.82%        
Cash interest rate 9.07%   9.07%        
PIK interest rate 0.75%   0.75%        
Acquisition Date Dec. 30, 2024            
Maturity Date Dec. 28, 2029   Dec. 28, 2029        
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]            
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.82%   9.82%        
Cash interest rate 9.07%   9.07%        
PIK interest rate 0.75%   0.75%        
Acquisition Date Dec. 30, 2024            
Maturity Date Dec. 28, 2029   Dec. 28, 2029        
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]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.82%   9.82%        
Cash interest rate 9.07%   9.07%        
PIK interest rate 0.75%   0.75%        
Acquisition Date Dec. 30, 2024            
Maturity Date Dec. 28, 2029   Dec. 28, 2029        
Principal/Share Amount $ 6,648,000            
Investments, amortized cost 6,548,000            
Investments, fair value $ 6,548,000            
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      
Investment, Issuer Name [Extensible Enumeration] whfcl:TranserviceHoldingsIncMember whfcl:TranserviceHoldingsIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Floor 2.00% 2.00% 2.00% 2.00%      
Spread Above Index 7.25% 7.50% 7.25% 7.50%      
Interest Rate 11.71% 12.96% 11.71% 12.96%      
Acquisition Date Jun. 29, 2023 Jun. 29, 2023          
Maturity Date Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028      
Principal/Share Amount $ 8,663,000 $ 8,888,000          
Investments, amortized cost 8,481,000 8,648,000          
Investments, fair value $ 8,715,000 $ 8,743,000          
Percent of net assets 3.00% 2.80% 3.00% 2.80%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:TrimliteBuyerLLCMember whfcl:TrimliteBuyerLLCMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] country:CA country:CA country:CA country:CA      
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember      
Floor 1.00% 1.00% 1.00% 1.00%      
Spread Above Index 6.50% 6.50% 6.50% 6.50%      
Interest Rate 9.99% 11.94% 9.99% 11.94%      
Acquisition Date Jul. 27, 2021 Jul. 27, 2021          
Maturity Date Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027      
Principal/Share Amount     $ 18,984 $ 19,624      
Investments, amortized cost $ 15,006,000 $ 15,472,000          
Investments, fair value $ 13,206,000 $ 14,810,000          
Percent of net assets 4.60% 4.70% 4.60% 4.70%      
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]: TriplePoint Acquisition Holdings LLC First Lien Secured Delayed Draw Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:TriplepointAcquisitionHoldingsLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.83%   9.83%        
Acquisition Date Jun. 14, 2024            
Maturity Date May 31, 2029   May 31, 2029        
Investments, fair value $ 9,000            
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Revolving Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:TriplepointAcquisitionHoldingsLlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.83%   9.83%        
Acquisition Date Jun. 14, 2024            
Maturity Date May 31, 2029   May 31, 2029        
Investments, fair value $ 12,000            
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Term Loan              
Schedule of Investments [Line Items]              
Investment, Issuer Name [Extensible Enumeration] whfcl:TriplepointAcquisitionHoldingsLlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] 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]        
Floor 1.00%   1.00%        
Spread Above Index 5.50%   5.50%        
Interest Rate 9.83%   9.83%        
Acquisition Date Jun. 14, 2024            
Maturity Date May 31, 2029   May 31, 2029        
Principal/Share Amount $ 5,349,000            
Investments, amortized cost 5,254,000            
Investments, fair value $ 5,338,000            
Investment, Identifier [Axis]: Turnberry Solutions., 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      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 10.21% 11.45% 10.21% 11.45%      
Acquisition Date Aug. 10, 2021 Aug. 10, 2021          
Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026      
Investments, fair value $ 4,000 $ 2,000          
Investment, Identifier [Axis]: Turnberry Solutions., 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
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 10.21% 11.45% 10.21% 11.45%      
Acquisition Date Aug. 10, 2021 Aug. 10, 2021          
Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026      
Principal/Share Amount $ 5,964,000 $ 6,026,000          
Investments, amortized cost 5,924,000 5,962,000          
Investments, fair value $ 5,964,000 $ 5,979,000          
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        
Investment, Issuer Name [Extensible Enumeration] whfcl:TwinRidgeCrsLpMember            
Investment, Type [Extensible Enumeration] whfcl:ClassCommonUnitsMember   whfcl:ClassCommonUnitsMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Food Distributors   Food Distributors        
Acquisition Date May 10, 2024            
Investment owned shares | shares 63   63        
Investments, amortized cost $ 317,000            
Investments, fair value $ 350,000            
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] false   false        
Investment, Identifier [Axis]: US Methanol Midco LLC (d/b/a US Methanol 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]   whfcl:UsMethanolMidcoLlcMember          
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember      
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.75%   7.75%      
Interest Rate   13.29%   13.29%      
Acquisition Date   Dec. 20, 2022          
Maturity Date   Dec. 20, 2027   Dec. 20, 2027      
Principal/Share Amount   $ 9,540,000          
Investments, amortized cost   9,345,000          
Investments, fair value   $ 9,449,000          
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]: US Methanol Midco LLC (d/b/a US Methanol 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:UsMethanolMidcoLlcMember          
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]      
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember      
Floor   1.00%   1.00%      
Spread Above Index   7.75%   7.75%      
Interest Rate   13.28%   13.28%      
Acquisition Date   Dec. 20, 2022          
Maturity Date   Dec. 20, 2027   Dec. 20, 2027      
Principal/Share Amount   $ 5,203,000          
Investments, amortized cost   5,111,000          
Investments, fair value   $ 5,153,000          
Percent of net assets   1.60%   1.60%      
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:UserzoomTechnologiesIncMember whfcl:UserzoomTechnologiesIncMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software      
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 7.50% 7.50% 7.50% 7.50%      
Interest Rate 12.75% 12.99% 12.75% 12.99%      
Acquisition Date Jan. 12, 2023 Jan. 12, 2023          
Maturity Date Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029      
Principal/Share Amount $ 9,819,000 $ 9,819,000          
Investments, amortized cost 9,618,000 9,570,000          
Investments, fair value $ 9,809,000 $ 9,719,000          
Percent of net assets 3.40% 3.20% 3.40% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:VistriaBlockedMgtInvestorLpMember whfcl:VistriaBlockedMgtInvestorLpMember          
Investment, Type [Extensible Enumeration] whfcl:SeriesUnitsMember whfcl:ClassAUnitsMember whfcl:SeriesUnitsMember whfcl:ClassAUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Acquisition Date Apr. 10, 2023 Apr. 10, 2023          
Investments, amortized cost $ 314,000 $ 314,000          
Investments, fair value $ 493,000 $ 406,000          
Percent of net assets 0.20% 0.10% 0.20% 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]: W Electric Intermediate 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        
Investment, Issuer Name [Extensible Enumeration] W Electric Intermediate Holdings, LLC [Member]            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.86%   10.86%        
Cash interest rate 9.86%   9.86%        
PIK interest rate 1.00%   1.00%        
Acquisition Date Aug. 15, 2024            
Maturity Date Aug. 15, 2029   Aug. 15, 2029        
Investments, fair value $ 9,000            
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]: W Electric Intermediate 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        
Investment, Issuer Name [Extensible Enumeration] W Electric Intermediate Holdings, LLC [Member]            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.86%   10.86%        
Cash interest rate 9.86%   9.86%        
PIK interest rate 1.00%   1.00%        
Acquisition Date Aug. 15, 2024            
Maturity Date Aug. 15, 2029   Aug. 15, 2029        
Principal/Share Amount $ 12,322,000            
Investments, amortized cost 12,124,000            
Investments, fair value $ 12,216,000            
Percent of net assets 4.30%   4.30%        
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]: 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      
Investments, fair value $ 22,741,000 $ 22,782,000         20,160,000
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 Controlled affiliate company investments      
Investment, Issuer Name [Extensible Enumeration] whfcl:WHFSTRSOhioSeniorLoanFundMember whfcl:WHFSTRSOhioSeniorLoanFundMember          
Investment, Type [Extensible Enumeration] whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember whfcl:LLCInterestsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Specialized Finance Specialized Finance Specialized Finance Specialized Finance      
Acquisition Date Jul. 19, 2019 Jul. 19, 2019          
Investment owned shares | shares 21,104 21,104 21,104 21,104      
Investments, amortized cost $ 21,104,000 $ 21,104,000          
Investments, fair value $ 22,741,000 $ 22,782,000          
Percent of net assets 7.90% 7.20% 7.90% 7.20%      
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]: 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 Controlled affiliate company investments      
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]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Specialized Finance Specialized Finance Specialized Finance Specialized Finance      
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember      
Spread Above Index 6.50% 6.50% 6.50% 6.50%      
Interest Rate 10.83% 11.85% 10.83% 11.85%      
Acquisition Date Jul. 19, 2019 Jul. 19, 2019          
Principal/Share Amount $ 84,416,000 $ 84,416,000          
Investments, amortized cost 84,416,000 84,416,000          
Investments, fair value $ 84,416,000 $ 84,416,000         $ 80,000,000
Percent of net assets 29.50% 26.60% 29.50% 26.60%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Health Care Services   Health Care Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.25%   6.25%        
Interest Rate 10.58%   10.58%        
Acquisition Date Aug. 01, 2024            
Maturity Date Aug. 01, 2029   Aug. 01, 2029        
Investments, fair value $ 2,000            
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember            
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 Services   Health Care Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.25%   6.25%        
Interest Rate 10.58%   10.58%        
Acquisition Date Aug. 01, 2024            
Maturity Date Aug. 01, 2029   Aug. 01, 2029        
Principal/Share Amount $ 258,000            
Investments, amortized cost 253,000            
Investments, fair value $ 254,000            
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] 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Health Care Services   Health Care Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.25%   6.25%        
Interest Rate 10.58%   10.58%        
Acquisition Date Aug. 01, 2024            
Maturity Date Aug. 01, 2029   Aug. 01, 2029        
Principal/Share Amount $ 7,689,000            
Investments, amortized cost 7,548,000            
Investments, fair value $ 7,555,000            
Percent of net assets 2.60%   2.60%        
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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:WhatIfMediaGroupLLCMember whfcl:WhatIfMediaGroupLLCMember          
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember      
Investment, Issuer Geographic Region [Extensible Enumeration] 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      
Acquisition Date Jul. 02, 2021 Jul. 02, 2021          
Investment owned shares | shares 3,081 3,081 3,081 3,081      
Investments, amortized cost $ 851,000 $ 851,000          
Investments, fair value $ 1,756,000 $ 1,615,000          
Percent of net assets 0.60% 0.50% 0.60% 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]: 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      
Investment, Issuer Name [Extensible Enumeration] whfcl:WhitestoneHomeFurnishingsLlcMember whfcl:WhitestoneHomeFurnishingsLlcMember          
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investment, Industry Sector [Extensible Enumeration] Home Furnishings Home Furnishings Home Furnishings Home Furnishings      
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 6.00% 6.50% 6.00% 6.50%      
Interest Rate 10.46% 11.96% 10.46% 11.96%      
Acquisition Date Nov. 06, 2023 Nov. 06, 2023          
Maturity Date Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026      
Principal/Share Amount $ 2,930,000 $ 2,990,000          
Investments, amortized cost 2,887,000 2,919,000          
Investments, fair value $ 2,930,000 $ 2,919,000          
Percent of net assets 1.00% 0.90% 1.00% 0.90%      
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:ZephyrBuyerL.p.Member            
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Interactive Media & Services   Interactive Media & Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.83%   10.83%        
Acquisition Date Jan. 31, 2024            
Maturity Date Jan. 31, 2030   Jan. 31, 2030        
Investments, fair value $ 48,000            
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]: 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        
Investment, Issuer Name [Extensible Enumeration] whfcl:ZephyrBuyerL.p.Member            
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investment, Industry Sector [Extensible Enumeration] Interactive Media & Services   Interactive Media & Services        
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember        
Floor 1.00%   1.00%        
Spread Above Index 6.50%   6.50%        
Interest Rate 10.83%   10.83%        
Acquisition Date Jan. 31, 2024            
Maturity Date Jan. 31, 2030   Jan. 31, 2030        
Principal/Share Amount $ 14,087,000            
Investments, amortized cost 13,789,000            
Investments, fair value $ 14,166,000            
Percent of net assets 5.00%   5.00%        
Investment, Restriction Status [true false] true   true        
Investment, Significant Unobservable Input [true false] true   true        
Investment, Non-income Producing [true false] false   false        
Morgan Stanley              
Schedule of Investments [Line Items]              
Unrealized appreciation $ 20,000            
Unrealized depreciation   $ (43,000)          
Morgan Stanley | CAD              
Schedule of Investments [Line Items]              
Currency to be sold 796 1,253          
Currency to be purchased   903          
Unrealized appreciation $ 20,000            
Unrealized depreciation   $ (43,000)          
Morgan Stanley | USD              
Schedule of Investments [Line Items]              
Currency to be purchased 574 903          
Advertising              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 11,937,000 $ 12,009,000          
Investments, fair value $ 12,035,000 $ 12,040,000          
Air Freight & Logistics              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 3,286,000 $ 3,503,000          
Investments, fair value $ 3,311,000 $ 3,504,000          
Broadline Retail              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 18,577,000 $ 18,798,000          
Investments, fair value $ 17,827,000 $ 18,759,000          
Building Products              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 13,445,000 $ 13,541,000          
Investments, fair value $ 13,437,000 $ 13,313,000          
Construction & Engineering              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 16,016,000 $ 9,476,000          
Investments, fair value $ 16,253,000 $ 9,550,000          
Data Processing & Outsourced Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 14,234,000 $ 14,969,000          
Investments, fair value $ 12,885,000 $ 14,659,000          
Distributors              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investments, amortized cost $ 9,307,000            
Investments, fair value $ 9,372,000            
Diversified Support Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 19,107,000 $ 19,246,000          
Investments, fair value $ 19,282,000 $ 19,136,000          
Electronic Equipment & Instruments              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investments, amortized cost   $ 13,203,000          
Investments, fair value   $ 13,269,000          
Environmental & Facilities Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 29,529,000 $ 19,632,000          
Investments, fair value $ 29,963,000 $ 19,691,000          
Food Distributors              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investments, amortized cost $ 4,919,000            
Investments, fair value $ 4,993,000            
Health Care Facilities              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investments, amortized cost $ 7,944,000            
Investments, fair value $ 8,004,000            
Health Care Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 4,898,000 $ 4,922,000          
Investments, fair value $ 4,995,000 $ 5,022,000          
Health Care Supplies              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 7,461,000 $ 7,500,000          
Investments, fair value $ 7,696,000 $ 7,530,000          
Household Appliances              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 7,649,000 $ 7,808,000          
Investments, fair value $ 7,632,000 $ 8,168,000          
Industrial Machinery & Supplies & Components              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investments, amortized cost   $ 6,498,000          
Investments, fair value   $ 6,561,000          
Investment Banking & Brokerage              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investments, amortized cost   $ 4,958,000          
Investments, fair value   $ 4,977,000          
IT Consulting And Other Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 32,427,000 $ 50,974,000          
Investments, fair value $ 32,720,000 $ 51,295,000          
Packaged Foods & Meats              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 6,939,000 $ 6,904,000          
Investments, fair value $ 7,009,000 $ 6,904,000          
Personal Products              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investments, amortized cost   $ 5,944,000          
Investments, fair value   $ 5,957,000          
Paper & Plastic Packaging Products & Materials              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 14,964,000 $ 14,939,000          
Investments, fair value $ 14,881,000 $ 14,913,000          
Research & Consulting Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 11,900,000 $ 15,815,000          
Investments, fair value $ 11,977,000 $ 16,149,000          
Technology Hardware, Storage & Peripherals              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 17,880,000 $ 18,811,000          
Investments, fair value $ 17,949,000 $ 18,853,000          
Wireless Telecommunication Services              
Schedule of Investments [Line Items]              
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 6,256,000 $ 6,294,000          
Investments, fair value $ 6,332,000 $ 6,295,000          
Debt Investments              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember, country:CA srt:NorthAmericaMember, country:CA srt:NorthAmericaMember, country:CA srt:NorthAmericaMember, country:CA      
Investments, amortized cost $ 631,941,000 $ 693,621,000          
Investments, fair value $ 596,626,000 $ 656,707,000          
Percent of net assets 208.40% 207.40% 208.40% 207.40%      
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 $ 16,365,000            
Investments, fair value $ 16,862,000            
Percent of net assets 6.00%   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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 29,360,000 $ 23,689,000          
Investments, fair value $ 28,518,000 $ 22,616,000          
Percent of net assets 9.90% 7.20% 9.90% 7.20%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 36,508,000 $ 39,567,000          
Investments, fair value $ 26,924,000 $ 34,202,000          
Percent of net assets 9.40% 11.00% 9.40% 11.00%      
Debt Investments | Automotive 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   $ 12,391,000          
Investments, fair value   $ 12,407,000          
Percent of net assets   3.90%   3.90%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 7,808,000 $ 7,329,000          
Investments, fair value $ 7,833,000 $ 7,243,000          
Percent of net assets 2.70% 2.30% 2.70% 2.30%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 4,556,000 $ 19,000,000          
Investments, fair value $ 4,580,000 $ 19,079,000          
Percent of net assets 1.60% 6.10% 1.60% 6.10%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] country:CA country:CA country:CA country:CA      
Investments, amortized cost $ 15,006,000 $ 15,472,000          
Investments, fair value $ 13,206,000 $ 14,810,000          
Percent of net assets 4.60% 4.70% 4.60% 4.70%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 15,765,000 $ 30,242,000          
Investments, fair value $ 16,026,000 $ 30,712,000          
Percent of net assets 5.60% 9.70% 5.60% 9.70%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 3,539,000 $ 137,000          
Investments, fair value $ 3,539,000 $ 137,000          
Percent of net assets 1.20%   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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 6,320,000 $ 8,023,000          
Investments, fair value $ 5,640,000 $ 6,901,000          
Percent of net assets 2.00% 2.20% 2.00% 2.20%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 28,409,000 $ 34,137,000          
Investments, fair value $ 28,572,000 $ 33,997,000          
Percent of net assets 10.00% 10.80% 10.00% 10.80%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 10,563,000 $ 15,946,000          
Investments, fair value $ 10,690,000 $ 12,475,000          
Percent of net assets 3.70% 3.90% 3.70% 3.90%      
Debt Investments | Diversified Chemicals              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled affiliate company investments Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 3,342,000 $ 10,549,000          
Investments, fair value $ 3,342,000 $ 10,008,000          
Percent of net assets 1.20% 3.20% 1.20% 3.20%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 9,559,000 $ 9,354,000          
Investments, fair value $ 9,414,000 $ 9,293,000          
Percent of net assets 3.30% 2.90% 3.30% 2.90%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 22,584,000 $ 20,877,000          
Investments, fair value $ 21,214,000 $ 20,300,000          
Percent of net assets 7.40% 6.50% 7.40% 6.50%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 15,802,000 $ 15,715,000          
Investments, fair value $ 16,032,000 $ 15,954,000          
Percent of net assets 5.60% 5.00% 5.60% 5.00%      
Debt 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   $ 22,984,000          
Investments, fair value   $ 22,895,000          
Percent of net assets   7.20%   7.20%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 8,694,000 $ 8,973,000          
Investments, fair value $ 8,660,000 $ 8,966,000          
Percent of net assets 3.00% 2.80% 3.00% 2.80%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 19,577,000 $ 17,577,000          
Investments, fair value $ 19,589,000 $ 17,643,000          
Percent of net assets 6.90% 5.50% 6.90% 5.50%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 20,142,000 $ 20,056,000          
Investments, fair value $ 19,535,000 $ 18,983,000          
Percent of net assets 6.80% 6.00% 6.80% 6.00%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 9,971,000 $ 10,048,000          
Investments, fair value $ 10,138,000 $ 10,135,000          
Percent of net assets 3.60% 3.20% 3.60% 3.20%      
Debt Investments | Home Furnishings              
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 Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 25,288,000 $ 27,965,000          
Investments, fair value $ 25,376,000 $ 27,508,000          
Percent of net assets 8.80% 8.60% 8.80% 8.60%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 12,104,000 $ 11,282,000          
Investments, fair value $ 11,656,000 $ 10,873,000          
Percent of net assets 4.10% 3.40% 4.10% 3.40%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 22,326,000 $ 22,088,000          
Investments, fair value $ 21,255,000 $ 21,397,000          
Percent of net assets 7.40% 6.80% 7.40% 6.80%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 12,124,000 $ 5,536,000          
Investments, fair value $ 12,225,000 $ 5,364,000          
Percent of net assets 4.30% 1.70% 4.30% 1.70%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 12,602,000 $ 12,357,000          
Investments, fair value $ 13,135,000 $ 13,191,000          
Percent of net assets 4.60% 4.20% 4.60% 4.20%      
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 $ 13,789,000            
Investments, fair value $ 14,214,000            
Percent of net assets 5.00%   5.00%        
Debt Investments | Investment Banking & Brokerage              
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   $ 3,521,000          
Investments, fair value   $ 3,522,000          
Percent of net assets   1.10%   1.10%      
Debt 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   $ 3,741,000          
Investments, fair value   $ 3,745,000          
Percent of net assets   1.20%   1.20%      
Debt Investments | Leisure Facilities              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 19,133,000 $ 22,593,000          
Investments, fair value $ 19,337,000 $ 22,436,000          
Percent of net assets 6.80% 7.10% 6.80% 7.10%      
Debt Investments | Leisure Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 45,674,000 $ 32,063,000          
Investments, fair value $ 23,298,000 $ 18,488,000          
Percent of net assets 8.10% 5.80% 8.10% 5.80%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 4,953,000 $ 4,944,000          
Investments, fair value $ 5,000,000 $ 4,901,000          
Percent of net assets 1.70% 1.50% 1.70% 1.50%      
Debt Investments | Office Services & 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   $ 15,476,000          
Investments, fair value   $ 15,503,000          
Percent of net assets   4.90%   4.90%      
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 $ 4,024,000            
Investments, fair value $ 4,087,000            
Percent of net assets 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 $ 9,119,000            
Investments, fair value $ 9,453,000            
Percent of net assets 3.30%   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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 21,016,000 $ 21,501,000          
Investments, fair value $ 20,710,000 $ 21,735,000          
Percent of net assets 7.30% 6.90% 7.30% 6.90%      
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 srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 4,823,000 $ 8,166,000          
Investments, fair value $ 4,927,000 $ 8,143,000          
Percent of net assets 1.70% 2.50% 1.70% 2.50%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 6,629,000 $ 17,254,000          
Investments, fair value $ 6,748,000 $ 17,492,000          
Percent of net assets 2.40% 5.50% 2.40% 5.50%      
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 $ 6,857,000            
Investments, fair value $ 7,070,000            
Percent of net assets 2.50%   2.50%        
Debt Investments | Specialized Finance              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 84,416,000 $ 84,416,000          
Investments, fair value $ 84,416,000 $ 84,416,000          
Percent of net assets 29.50% 26.60% 29.50% 26.60%      
Debt Investments | Systems Software              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 16,573,000 $ 20,618,000          
Investments, fair value $ 17,267,000 $ 11,523,000          
Percent of net assets 5.90% 3.60% 5.90% 3.60%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 18,547,000 $ 16,808,000          
Investments, fair value $ 18,072,000 $ 16,745,000          
Percent of net assets 6.30% 5.30% 6.30% 5.30%      
Debt Investments | Transaction & Payment Processing 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 $ 8,074,000            
Investments, fair value $ 8,066,000            
Percent of net assets 2.80%   2.80%        
Debt Investments | Wireless 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 Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investments, amortized cost   $ 21,226,000          
Investments, fair value   $ 20,969,000          
Percent of net assets   6.60%   6.60%      
Subordinated Debt [Member]              
Schedule of Investments [Line Items]              
Investments, amortized cost $ 1,152,000 $ 167,000          
Investments, fair value $ 1,175,000 $ 167,000          
Equity Investments              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Controlled affiliate company investments, Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 63,299,000 $ 46,400,000          
Investments, fair value $ 45,587,000 $ 39,461,000          
Percent of net assets 16.00% 12.30% 16.00% 12.30%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 297,000 $ 294,000          
Investments, fair value $ 589,000 $ 420,000          
Percent of net assets 0.20% 0.10% 0.20% 0.10%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 1,250,000 $ 1,250,000          
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 514,000 $ 514,000          
Investments, fair value $ 756,000 $ 832,000          
Percent of net assets 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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 24,000 $ 423,000          
Investments, fair value   $ 1,053,000          
Percent of net assets   0.30%   0.30%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 404,000 $ 404,000          
Investments, fair value $ 388,000 $ 404,000          
Percent of net assets 0.10% 0.10% 0.10% 0.10%      
Equity Investments | Diversified Chemicals              
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 Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 4,537,000 $ 4,537,000          
Investments, fair value $ 1,657,000 $ 251,000          
Percent of net assets 0.60% 0.10% 0.60% 0.10%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 376,000 $ 360,000          
Investments, fair value $ 149,000 $ 305,000          
Percent of net assets 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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 334,000 $ 167,000          
Investments, fair value $ 100,000 $ 18,000          
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 942,000 $ 825,000          
Investments, fair value $ 1,400,000 $ 983,000          
Percent of net assets 0.50% 0.30% 0.50% 0.30%      
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 $ 317,000            
Investments, fair value $ 350,000            
Percent of net assets 0.10%   0.10%        
Equity 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 $ 1,100,000            
Investments, fair value $ 907,000            
Percent of net assets 0.30%   0.30%        
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   $ 1,100,000          
Investments, fair value   $ 1,330,000          
Percent of net assets   0.40%   0.40%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 788,000 $ 788,000          
Investments, fair value $ 1,012,000 $ 1,053,000          
Percent of net assets 0.40% 0.30% 0.40% 0.30%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 851,000 $ 851,000          
Investments, fair value $ 1,756,000 $ 1,615,000          
Percent of net assets 0.60% 0.50% 0.60% 0.50%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 1,926,000 $ 1,926,000          
Investments, fair value $ 3,504,000 $ 2,804,000          
Percent of net assets 1.30% 0.80% 1.30% 0.80%      
Equity Investments | Leisure Facilities              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments Non-controlled affiliate company investments, Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 2,734,000 $ 2,734,000          
Investments, fair value $ 243,000 $ 183,000          
Percent of net assets 0.10%   0.10%        
Equity Investments | Leisure Products              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration]   Controlled affiliate company investments, Non-controlled affiliate company investments   Controlled affiliate company investments, Non-controlled affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember      
Investments, amortized cost   $ 4,060,000          
Equity Investments | Office Services & Supplies              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments, Non-controlled affiliate company investments   Controlled affiliate company investments, Non-controlled affiliate company investments        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investments, amortized cost $ 4,060,000            
Equity Investments | Other Diversified Financial 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   $ 2,890,000          
Investments, fair value   $ 3,472,000          
Percent of net assets   1.10%   1.10%      
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 400,000 $ 400,000          
Investments, fair value   $ 179,000          
Percent of net assets   0.10%   0.10%      
Equity Investments | Real Estate Operating Companies              
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   $ 840,000          
Investments, fair value   $ 1,023,000          
Percent of net assets   0.30%   0.30%      
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 $ 840,000            
Investments, fair value $ 162,000            
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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 333,000 $ 333,000          
Investments, fair value $ 368,000 $ 295,000          
Percent of net assets 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 Non-controlled/non-affiliate company investments Non-controlled/non-affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 600,000 $ 600,000          
Investments, fair value $ 374,000 $ 459,000          
Percent of net assets 0.10% 0.20% 0.10% 0.20%      
Equity Investments | Specialized Finance              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments Controlled affiliate company investments      
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember      
Investments, amortized cost $ 21,104,000 $ 21,104          
Investments, fair value $ 22,741,000 $ 22,782,000          
Percent of net assets 7.90% 7.20% 7.90% 7.20%      
Equity Investments | Systems Software              
Schedule of Investments [Line Items]              
Investment, Issuer Affiliation [Extensible Enumeration] Non-controlled affiliate company investments   Non-controlled affiliate company investments        
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember        
Investments, amortized cost $ 19,568,000            
Investments, fair value $ 9,131,000            
Percent of net assets 3.20%   3.20%        
Money Market Funds              
Schedule of Investments [Line Items]              
Percent of net assets 4.60%   4.60%        
Money Market Funds amortized cost $ 13,249,000            
Money Market Fair Value $ 13,249,000            
Goldman Sachs Money Market Fund (CUSIP: 38141W315)              
Schedule of Investments [Line Items]              
Percent of net assets 0.30%   0.30%        
Weighted average interest rate 4.33%   4.33%        
Money Market Funds amortized cost $ 837,000            
Money Market Fair Value $ 837,000            
Invesco Treasury Money Market Fund (CUSIP: X9USDINVE)              
Schedule of Investments [Line Items]              
Percent of net assets 4.30%   4.30%        
Weighted average interest rate 3.83%   3.83%        
Money Market Funds amortized cost $ 12,412,000            
Money Market Fair Value 12,412,000            
Pressurized Holdings, LLC [Member] | Preferred Units [Member]              
Schedule of Investments [Line Items]              
Investments, amortized cost         $ 3,892,000    
Sklar Holdings, Inc [Member] | First Lien Secured Term Loan [Member]              
Schedule of Investments [Line Items]              
Investments, amortized cost           $ 3,339,000  
Honors Holdings, LLC [Member]              
Schedule of Investments [Line Items]              
Additional interest for senior term debt   3.50%          
Non-controlled/non-affiliate company investments              
Schedule of Investments [Line Items]              
Investments, fair value $ 504,832,000 $ 577,798,000          
v3.25.1
ORGANIZATION
 12 Months Ended
Dec. 31, 2024
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 Investment Company Act of 1940, as amended (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 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.

Engaging in commodity interest transactions such as swap transactions or futures contracts for the Company may cause WhiteHorse Advisers to fall within the definition of “commodity pool operator” under the Commodity Exchange Act (the “CEA”) and related regulations promulgated by the U.S. Commodity Futures Trading Commission (the “CFTC”). On January 23, 2020, WhiteHorse Advisers claimed an exclusion from the definition of the term “commodity pool operator” under the CEA and the CFTC regulations in connection with its management of the Company (the “Exclusion”) and, therefore, WhiteHorse Advisers is not subject to CFTC registration or regulation under the CEA as a commodity pool operator with respect to its management of the Company. WhiteHorse Advisers has affirmed the Exclusion on January 14, 2025 and intends to continue to affirm the Exclusion on an annual basis.

v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 12 Months Ended
Dec. 31, 2024
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 PMA Holdco Blocker, LLC, 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-K 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 will be 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 trustee 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 December 31, 2024 and December 31, 2023.

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 December 31, 2024 or December 31, 2023. 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 2020 remain subject to examination by the Internal Revenue Service.

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 2023, the FASB issued ASU 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” or ASU 2023-07. ASU 2023-07 enhances the disclosures required for reportable segments on an annual and interim basis. ASU 2023-07 is effective on a retrospective basis for annual periods beginning after December 15, 2023, for interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. Management has adopted ASU 2023-07 effective December 31, 2024 and application of the guidance did not have a material impact on the Company’s consolidated financial statements. See Note 13 for more information on the adoption of ASU 2023-07.

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
 12 Months Ended
Dec. 31, 2024
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 years ended December 31, 2024, 2023 and 2022.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 

($ in thousands)

    

​

2024

​

​

2023

​

​

2022

Realized gain (loss) on forward currency contracts

​

$

13

​

$

27

​

$

(3)

Unrealized appreciation (depreciation) on forward currency contracts

​

​

63

​

​

(40)

​

​

—

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

​

$

76

​

$

(13)

​

$

(3)

​

​

​

​

​

​

​

​

​

​

​

​

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. 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

​

2/4/25

​

$

20

​

$

—

Total

​

​

​

​

​

​

​

​

​

​

​

$

20

​

$

—

​

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. Open contracts as of December 31, 2023 were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

1,253

CAD

​

$

903

USD

​

2/7/24

​

$

—

​

$

(43)

Total

​

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(43)

​

The following table is a summary of the average USD notional exposure to foreign currency forward contracts for the years ended December 31, 2024 and 2023:

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31,

Average USD notional outstanding

    

    

​

2024

​

​

2023

Forward currency contracts

​

​

$

965

​

$

587

​

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. The following tables present 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 and 2023.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2023

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)

​

$

—

​

$

43

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

43

Total

​

$

—

​

$

43

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

43

(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
 12 Months Ended
Dec. 31, 2024
INVESTMENTS  
INVESTMENTS

NOTE 4 - INVESTMENTS

Investments consisted of the following:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2024

​

As of December 31, 2023

​

    

Amortized Cost

    

Fair Value

    

Amortized Cost

    

Fair Value

First lien secured loans

​

$

538,078

​

$

502,693

​

$

581,518

​

$

553,085

Second lien secured loans

​

 

8,295

​

 

8,342

​

 

27,520

​

 

19,039

Unsecured loans

​

​

1,152

​

 

1,175

​

​

167

​

 

167

Subordinated Note to STRS JV

​

 

84,416

​

 

84,416

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

42,195

​

 

22,846

​

 

25,296

​

 

16,679

Equity in STRS JV

​

 

21,104

​

 

22,741

​

 

21,104

​

 

22,782

Total

​

$

695,240

​

$

642,213

​

$

740,021

​

$

696,168

​

​

​

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

​

​

​

​

​

​

​

​

​

​

​

​

Industry ($ in thousands)

​

As of December 31, 2024

​

As of December 31, 2023

​

Advertising

    

$

17,451

    

3.3

%  

$

420

    

0.1

%

Air Freight & Logistics

​

​

28,518

​

5.3

​

​

22,616

​

3.8

​

Application Software

​

​

26,924

​

5.0

​

​

34,202

​

5.8

​

Automotive Retail

​

​

—

​

—

​

​

12,407

​

2.1

​

Broadcasting

​

​

7,833

​

1.5

​

​

7,243

​

1.2

​

Broadline Retail

​

​

5,336

​

1.0

​

​

19,911

​

3.4

​

Building Products

​

​

13,206

​

2.5

​

​

15,863

​

2.7

​

Commodity Chemicals

​

​

16,026

​

3.0

​

​

30,712

​

5.2

​

Construction & Engineering

​

​

3,927

​

0.7

​

​

541

​

0.1

​

Construction Materials

​

​

5,640

​

1.1

​

​

6,901

​

1.2

​

Data Processing & Outsourced Services

​

​

28,572

​

5.3

​

​

33,997

​

5.8

​

Distributors

​

​

10,690

​

2.0

​

​

12,475

​

2.1

​

Diversified Chemicals

​

​

4,999

​

0.9

​

​

10,259

​

1.7

​

Diversified Financial Services

​

​

—

​

—

​

​

3,472

​

0.6

​

Diversified Support Services

​

​

9,563

​

1.8

​

​

9,598

​

1.6

​

Education Services

​

​

21,314

​

4.0

​

​

20,318

​

3.5

​

Electric Utilities

​

​

16,032

​

3.0

​

​

15,954

​

2.7

​

Environmental & Facilities Services

​

​

1,400

​

0.3

​

​

23,878

​

4.1

​

Food Distributors

​

​

350

​

0.1

​

​

—

​

—

​

Health Care Facilities

​

​

8,660

​

1.6

​

​

8,966

​

1.5

​

Health Care Services

​

​

19,589

​

3.7

​

​

17,643

​

3.0

​

Health Care Supplies

​

​

19,535

​

3.7

​

​

18,983

​

3.2

​

Heavy Electrical Equipment

​

​

10,138

​

1.9

​

​

10,135

​

1.7

​

Home Furnishings

​

​

25,376

​

4.7

​

​

27,508

​

4.7

​

Household Appliances

​

​

22,162

​

4.1

​

​

22,727

​

3.9

​

Household Products

​

​

11,656

​

2.2

​

​

10,873

​

1.9

​

Industrial Machinery & Supplies & Components

​

​

13,237

​

2.5

​

​

6,417

​

1.2

​

Integrated Telecommunication Services

​

​

13,135

​

2.5

​

​

13,191

​

2.2

​

Interactive Media & Services

​

​

15,970

​

3.0

​

​

1,615

​

0.3

​

Investment Banking & Brokerage

​

​

—

​

—

​

​

3,522

​

0.6

​

IT Consulting & Other Services

​

​

3,504

​

0.6

​

​

6,549

​

1.1

​

Leisure Facilities

​

​

19,580

​

3.7

​

​

22,619

​

3.8

​

Leisure Products

​

​

23,298

​

4.4

​

​

18,488

​

3.1

​

Life Sciences Tools & Services

​

​

5,000

​

0.9

​

​

4,901

​

0.8

​

Office Services & Supplies

​

​

—

​

—

​

​

15,503

​

2.6

​

Packaged Foods & Meats

​

​

4,087

​

0.7

​

​

—

​

—

​

Paper & Plastic Packaging Products & Materials

​

​

—

​

—

​

​

179

​

—

​

Paper Products

​

​

9,453

​

1.8

​

​

—

​

—

​

Real Estate Services

​

​

20,872

​

3.9

​

​

22,758

​

3.9

​

Research & Consulting Services

​

​

5,295

​

0.9

​

​

8,438

​

1.4

​

Security & Alarm Services

​

​

7,070

​

1.3

​

​

—

​

—

​

Specialized Consumer Services

​

​

7,122

​

1.3

​

​

17,951

​

3.0

​

Specialized Finance(1)

​

​

—

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

Industry ($ in thousands)

​

As of December 31, 2024

​

As of December 31, 2023

​

Systems Software

​

​

26,398

​

4.9

​

​

11,523

​

2.0

​

Technology Hardware, Storage & Peripherals

​

​

18,072

​

3.4

​

​

16,745

​

2.8

​

Transaction & Payment Processing Services

​

​

8,066

​

1.5

​

​

—

​

—

​

Wireless Telecommunication Services

​

​

—

​

—

​

​

20,969

​

3.6

​

Total(1)

​

$

535,056

​

100.0

%

$

588,970

​

100.0

%

(1)Excludes investments in STRS JV.

As of December 31, 2024, 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 December 31, 2023, the portfolio companies underlying the investments are all located in the United States and its territories, except for Trimlite Buyer, LLC, which is domiciled in Canada. As of December 31, 2024 and December 31, 2023, the weighted average remaining term of the Company’s debt investments, excluding non-accrual investments, was approximately 3.0 years and 2.8 years, respectively.

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. As of December 31, 2023 the total cost basis of non-accrual loans was $38,322 and the total fair value of non-accrual loans was $14,087.

​

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 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

*

The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware limited liability company that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of limited liability company (“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.

(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 from this category to 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.

The following table presents the schedule of investments in and advances to affiliated and controlled affiliated persons (as defined by the 1940 Act) as of and for the year ended December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends, interest 

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

​

​

​

​

​

​

Realized

​

Appreciation

​

December 31, 

Affiliated Person(1)

​

Asset

    

income

    

2022

    

Purchases

    

Sales

    

Gain (Loss)

    

(Depreciation)

    

2023

Non-controlled affiliates

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

Arcole Holding Corporation

​

Equity

​

$

84

​

$

6,380

​

$

—

​

$

(6,605)

​

$

(339)

​

$

564

​

$

—

Playmonster Group LLC

​

Priority First Lien Secured Term Loan

​

​

129

​

 

176

​

 

943

​

 

—

​

 

—

​

 

(104)

​

 

1,015

Playmonster Group LLC

​

First Lien Secured Term Loan

​

 

(85)

​

 

2,977

​

 

—

​

 

—

​

 

—

​

 

(1,614)

​

 

1,363

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

​

​

270

​

 

—

​

 

2,961

​

 

—

​

 

—

​

 

(168)

​

 

2,793

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

​

Common Units

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

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

​

Preferred Units

​

​

—

​

 

—

​

 

4,537

​

 

—

​

 

—

​

 

(4,286)

​

 

251

Total Non-controlled affiliates

​

​

​

$

398

​

$

9,533

​

$

8,441

​

$

(6,605)

​

$

(339)

​

$

(5,608)

​

$

5,422

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends, interest 

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

​

​

​

​

​

​

Realized

​

Appreciation

​

December 31, 

Affiliated Person(1)

​

Asset

    

income

    

2022

    

Purchases

    

Sales

    

Gain (Loss)

    

(Depreciation)

    

2023

Controlled affiliates

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

American Crafts, LC

​

Super Priority First Lien Secured Term Loan

​

$

109

​

$

—

​

$

1,903

​

$

—

​

$

—

​

$

(25)

​

$

1,878

American Crafts, LC

​

Priority First Lien Secured Term Loan

​

​

575

​

​

—

​

​

5,105

​

​

—

​

​

—

​

​

(1,879)

​

​

3,226

American Crafts, LC

​

First Lien Secured Term Loan

​

​

568

​

​

—

​

​

7,491

​

​

—

​

​

—

​

​

(6,938)

​

​

553

American Crafts, LC

​

First Lien Secured Delayed Draw Loan

​

​

95

​

​

—

​

​

1,259

​

​

—

​

​

—

​

​

(1,166)

​

​

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

​

​

9,488

​

​

80,000

​

​

4,416

​

​

—

​

​

—

​

​

—

​

​

84,416

WHF STRS Ohio Senior Loan Fund LLC*

 

Equity

​

 

6,158

​

 

20,160

​

 

1,104

​

 

—

​

 

—

​

 

1,518

​

 

22,782

Total Controlled affiliates

 

  

​

$

16,993

​

$

100,160

​

$

21,278

​

$

—

​

$

—

​

$

(8,490)

​

$

112,948

*

The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware limited liability company that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of limited liability company (“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.

(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 from this category to a different category.

In March 2023, as a result of a restructuring agreement between the Company and American Crafts, LC, the Company’s investments are controlled affiliate investments, as defined by the 1940 Act.

In March 2023, as part of a restructuring agreement between the Company and Sklar Holdings, Inc (d/b/a Starco), the Company’s first lien secured term loan investment to Sklar Holdings, Inc, with a total cost basis of $3,339, converted into a new second lien secured term loan to Chase Products Co. (f/k/a Starco) and preferred units and common units of Pressurized Holdings, LLC (f/k/a Starco). During the three months ended June 30, 2023, the Company received a paydown of $690 on its investment in Sklar Holdings, Inc (d/b/a Starco) first lien secured term loan, and the remaining Sklar Holdings, Inc (d/b/a Starco) second lien secured term loan investment, with a cost basis of $3,892, was converted into preferred units of Pressurized Holdings, LLC (f/k/a Starco).

​

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 December 31, 2024 and December 31, 2023, STRS JV had total assets of $309,077 and $332,160, respectively. STRS JV’s portfolio consisted of debt investments in 38 and 34 portfolio companies as of December 31, 2024 and December 31, 2023. As of December 31, 2024 and December 31, 2023, the largest investment by aggregate principal amount (including any unfunded commitments) in a single portfolio company in STRS JV’s portfolio was $19,594 and $19,889, respectively. The five largest investments in portfolio companies by fair value in STRS JV totaled $79,058 and $83,564 as of December 31, 2024 and December 31, 2023, 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 December 31, 2024 and December 31, 2023, the Company and STRS Ohio owned 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 December 31, 2024 and December 31, 2023, respectively. As of both December 31, 2024 and December 31, 2023, 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, among other things, 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, among other things, enable borrowings in British pounds or

euros. On July 15, 2021, the terms of the STRS JV Credit Facility were amended to, among other things, 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, among other things, (i) permanently increase STRS Credit’s availability under the 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 Credit Facility.

On January 13, 2023, the terms of the STRS JV Credit Facility were further amended to, among other things, (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.

On May 18, 2023, the terms of the STRS JV Credit Facility were further amended to, among other things, (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 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 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 a risk-free 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 6.4% per annum under the STRS JV Credit Facility.

As of December 31, 2023, the STRS JV Credit Facility had $262,500 of commitments subject to leverage and borrowing base restrictions with an interest rate based on a risk-free index rate such as SOFR plus 2.72%. As of December 31, 2023, the maturity date of the STRS JV Credit Facility was July 19, 2026. As of December 31, 2023, STRS JV had $165,244 of outstanding borrowings and an interest rate outstanding of 7.7% per annum under the STRS JV Credit Facility.

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

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

​

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

%

Invesco Treasury Money Market Fund (CUSIP: X9USDINVE)(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

​

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

958

CAD

​

$

691 USD

​

2/7/2024

​

$

—

​

$

(33)

Morgan Stanley

​

€

1,181

EUR

​

$

1,249 USD

​

2/7/2024

​

​

—

​

​

(56)

Morgan Stanley

​

£

1,340

GBP

​

$

1,625 USD

​

2/7/2024

​

​

—

​

​

(83)

Total

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(172)

(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, CDOR, 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 CDOR. 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.

​

​

Below is a listing of STRS JV’s individual investments as of December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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%

​

12.25%

​

02/18/22

​

12/15/26

​

9,100

​

$

8,991

​

$

9,014

​

26.0

%

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

12.25%

​

03/11/22

​

12/15/26

​

3,054

​

​

3,018

​

​

3,025

​

8.7

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

12.25%

​

02/18/22

​

12/15/26

​

—

​

​

—

​

​

1

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

12,009

​

​

12,040

​

34.7

​

Air Freight & Logistics

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

11.11%

​

02/17/22

​

06/15/26

​

3,541

​

​

3,503

​

​

3,504

​

10.1

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.50%

​

11.11%

​

02/17/22

​

06/15/26

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

3,503

​

​

3,504

​

10.1

​

Broadline Retail

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.99%

​

07/19/19

​

07/01/25

​

18,908

​

​

18,798

​

​

18,762

​

54.1

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.99%

​

07/19/19

​

07/01/25

​

—

​

​

—

​

​

(3)

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,798

​

​

18,759

​

54.1

​

Building Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Drew Foam Companies Inc

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

7.25%

​

12.75%

​

11/09/20

​

11/05/25

​

13,644

​

​

13,541

​

​

13,313

​

38.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

13,541

​

​

13,313

​

38.4

​

Construction & Engineering

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

11.38%

​

12/21/23

​

01/02/29

​

3,091

​

​

3,015

​

​

3,015

​

8.7

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

11.38%

​

12/21/23

​

01/02/29

​

1,400

​

​

1,366

​

​

1,365

​

3.8

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

11.37%

​

12/21/23

​

01/02/29

​

196

​

​

191

​

​

191

​

0.6

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

12.27%

​

03/17/23

​

02/07/28

​

4,455

​

​

4,344

​

​

4,405

​

12.7

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.75%

​

12.42%

​

03/17/23

​

02/07/28

​

575

​

​

560

​

​

569

​

1.6

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

12.42%

​

03/17/23

​

02/07/28

​

—

​

​

—

​

​

5

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

9,476

​

​

9,550

​

27.4

​

Data Processing & Outsourced Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Term Loan

​

1.00%

​

CDOR

​

6.50%

​

11.94%

​

01/22/20

​

12/19/24

​

19,416

​

​

14,969

​

​

14,654

​

42.3

​

Geo Logic Systems Ltd.(7)(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CDOR

​

6.50%

​

11.94%

​

01/22/20

​

12/19/24

​

—

​

​

—

​

​

5

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,969

​

​

14,659

​

42.3

​

Diversified Support Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

11.20%

​

10/31/23

​

10/26/28

​

7,500

​

​

7,337

​

​

7,337

​

21.2

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

11.20%

​

10/31/23

​

10/26/28

​

—

​

​

—

​

​

—

​

—

​

Quest Events, LLC

​

First Lien Secured Term Loan

​

2.00%

​

SOFR

​

7.25%

​

12.86%

​

07/19/19

​

09/30/26

​

11,709

​

​

11,663

​

​

11,557

​

33.3

​

Quest Events, LLC

​

First Lien Secured Revolving Loan

​

2.00%

​

SOFR

​

7.25%

​

12.86%

​

07/19/19

​

09/30/26

​

247

​

​

246

​

​

242

​

0.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

19,246

​

​

19,136

​

55.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

Electronic Equipment & Instruments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

LMG Holdings, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

12.00%

​

06/28/21

​

04/30/26

​

13,330

​

$

13,203

​

$

13,265

​

38.3

%

LMG Holdings, Inc.

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

12.00%

​

06/28/21

​

04/30/26

​

—

​

​

—

​

​

4

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

13,203

​

​

13,269

​

38.3

​

Environmental & Facilities Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

08/09/23

​

08/01/29

​

5,985

​

​

5,845

​

​

5,898

​

17.0

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

08/09/23

​

08/01/29

​

180

​

​

176

​

​

181

​

0.5

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

08/09/23

​

08/01/29

​

—

​

​

—

​

​

(3)

​

—

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

11.86%

​

03/01/22

​

12/29/26

​

11,192

​

​

11,073

​

​

11,080

​

32.0

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.25%

​

11.94%

​

03/01/22

​

12/29/26

​

2,366

​

​

2,341

​

​

2,342

​

6.8

​

Juniper Landscaping Holdings LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

12.11%

​

03/01/22

​

12/29/26

​

199

​

​

197

​

​

193

​

0.6

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

19,632

​

​

19,691

​

56.9

​

Health Care Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

12.48%

​

04/11/23

​

03/01/29

​

5,053

​

​

4,922

​

​

5,013

​

14.5

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

12.48%

​

04/11/23

​

03/01/29

​

—

​

​

—

​

​

9

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,922

​

​

5,022

​

14.5

​

Health Care Supplies

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

11.60%

​

10/25/23

​

10/18/28

​

5,022

​

​

4,901

​

​

4,901

​

14.1

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

11.60%

​

10/25/23

​

10/18/28

​

—

​

​

—

​

​

—

​

—

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.95%

​

07/27/23

​

07/11/29

​

2,660

​

​

2,599

​

​

2,626

​

7.6

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.95%

​

07/27/23

​

07/11/29

​

—

​

​

—

​

​

3

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,500

​

​

7,530

​

21.7

​

Household Appliances

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.25%

​

10.18%

​

05/04/22

​

04/28/28

​

6,576

​

​

6,821

​

​

7,172

​

20.7

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

11.50%

​

05/04/22

​

04/28/28

​

1,001

​

​

987

​

​

996

​

2.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

7,808

​

​

8,168

​

23.6

​

Industrial Machinery & Supplies & Components

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Pennsylvania Machine Works, LLC (d/b/a Penn Western)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

11.61%

​

03/25/22

​

03/08/27

​

6,561

​

​

6,498

​

​

6,561

​

18.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,498

​

​

6,561

​

18.9

​

Investment Banking & Brokerage

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

TOUR Intermediate Holdings, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

05/19/20

​

05/15/25

​

2,657

​

​

2,643

​

​

2,657

​

7.7

​

TOUR Intermediate Holdings, LLC

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

05/19/20

​

05/15/25

​

2,320

​

​

2,315

​

​

2,320

​

6.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

4,958

​

​

4,977

​

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

​

IT Consulting & Other Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

ATSG, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

12.04%

​

03/27/23

​

11/12/26

​

9,873

​

$

9,678

​

$

9,771

​

28.2

%

Cennox Holdings Limited (d/b/a Cennox)(8)(14)

​

First Lien Secured Term Loan

​

1.00%

​

SONIA

​

6.25%

​

11.59% (11.34% Cash + 0.25% PIK)

​

07/16/21

​

05/04/26

​

2,825

​

​

3,863

​

​

3,538

​

10.2

​

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

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.50%

​

10.44% (10.19% Cash + 0.25% PIK)

​

06/28/22

​

05/04/26

​

9,422

​

​

9,851

​

​

10,257

​

29.6

​

Cennox Holdings Limited (d/b/a Cennox)(8)(14)

​

First Lien Secured Revolving Loan

​

1.00%

​

SONIA

​

6.25%

​

11.56% (11.31% Cash + 0.25% PIK)

​

07/16/21

​

05/04/26

​

864

​

​

1,182

​

​

1,082

​

3.1

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.98%

​

05/10/23

​

04/10/29

​

6,247

​

​

6,084

​

​

6,194

​

17.9

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

11.98%

​

05/10/23

​

04/10/29

​

392

​

​

378

​

​

389

​

1.1

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.98%

​

05/10/23

​

04/10/28

​

—

​

​

—

​

​

11

​

—

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

11.50%

​

01/27/21

​

12/31/26

​

11,036

​

​

10,925

​

​

10,993

​

31.7

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

11.53%

​

01/27/21

​

12/31/26

​

2,976

​

​

2,945

​

​

2,965

​

8.6

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

11.58%

​

01/27/21

​

12/31/26

​

107

​

​

106

​

​

114

​

0.3

​

Turnberry Solutions, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.75%

​

11.45%

​

08/10/21

​

09/02/26

​

6,026

​

​

5,962

​

​

5,979

​

17.2

​

Turnberry Solutions, Inc.

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

5.75%

​

11.45%

​

08/10/21

​

09/02/26

​

—

​

​

—

​

​

2

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

50,974

​

​

51,295

​

147.9

​

Packaged Foods & Meats

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Poultry Holdings LLC (HPP)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96% (11.21% Cash + 0.75% PIK)

​

10/21/19

​

06/28/25

​

6,939

​

​

6,904

​

​

6,904

​

19.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,904

​

​

6,904

​

19.9

​

Paper & Plastic Packaging Products & Materials

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

LINC Systems, LLC

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.25%

​

11.93%

​

06/22/21

​

02/24/26

​

8,534

​

​

8,454

​

​

8,443

​

24.4

​

LINC Systems, LLC

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

11.93%

​

06/22/21

​

02/24/26

​

—

​

​

—

​

​

(1)

​

—

​

Max Solutions, Inc.(13)

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

7.66%

​

13.15%

​

10/07/22

​

09/29/28

​

6,589

​

​

6,485

​

​

6,488

​

18.7

​

Max Solutions, Inc.(6)(13)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

7.66%

​

13.15%

​

10/07/22

​

09/29/28

​

—

​

​

—

​

​

(17)

​

—

​

Max Solutions, Inc.(10)

​

First Lien Secured Revolving Loan

​

1.00%

​

CDOR

​

7.66%

​

13.15%

​

10/07/22

​

09/29/28

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

14,939

​

​

14,913

​

43.1

​

Personal Care Products

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Sunless, Inc.

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.75%

​

12.20%

​

10/21/19

​

08/13/25

​

5,507

​

​

5,459

​

​

5,473

​

15.8

​

Sunless, Inc.(6)

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.75%

​

12.21%

​

10/21/19

​

08/13/25

​

488

​

​

485

​

​

484

​

1.4

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

5,944

​

​

5,957

​

17.2

​

Pharmaceuticals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

EurIBOR

​

6.00%

​

9.87%

​

12/16/21

​

11/01/27

​

12,163

​

​

13,552

​

​

13,401

​

38.7

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.00%

​

11.46%

​

12/16/21

​

11/01/27

​

971

​

​

959

​

​

971

​

2.8

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.00%

​

11.56%

​

12/16/21

​

11/01/27

​

883

​

​

871

​

​

883

​

2.5

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.00%

​

11.53%

​

12/16/21

​

11/01/27

​

1,156

​

​

1,141

​

​

1,161

​

3.3

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

16,523

​

​

16,416

​

47.3

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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%

​

11.80%

​

12/28/21

​

10/19/26

​

9,555

​

$

9,448

​

$

9,074

​

26.2

%

HRG Management, LLC (d/b/a HomeRiver Group, LLC)(6)(11)

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

Base Rate

​

6.22%

​

12.10%

​

02/18/22

​

10/19/26

​

2,398

​

​

2,369

​

​

2,282

​

6.6

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.25%

​

11.80%

​

02/18/22

​

10/19/26

​

596

​

​

589

​

​

547

​

1.6

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

03/01/22

​

01/21/27

​

7,510

​

​

7,418

​

​

6,706

​

19.3

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

03/01/22

​

01/21/27

​

725

​

​

716

​

​

647

​

1.9

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

20,540

​

​

19,256

​

55.6

​

Research & Consulting Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

5.50%

​

11.00%

​

07/15/21

​

06/23/27

​

8,604

​

​

8,541

​

​

8,562

​

24.7

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(13)(14)

​

First Lien Secured Term Loan

​

0.50%

​

SOFR

​

6.50%

​

11.85%

​

03/23/23

​

09/28/29

​

2,807

​

​

2,744

​

​

2,786

​

8.0

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(10)(13)(14)

​

First Lien Secured Term Loan

​

0.50%

​

CDOR

​

6.50%

​

11.94%

​

03/23/23

​

09/28/29

​

3,873

​

​

2,759

​

​

2,892

​

8.3

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(8)(13)(14)

​

First Lien Secured Term Loan

​

0.00%

​

SONIA

​

6.50%

​

11.72%

​

03/23/23

​

09/28/29

​

171

​

​

205

​

​

217

​

0.6

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(13)(14)

​

First Lien Secured Delayed Draw Loan

​

0.50%

​

SOFR

​

6.50%

​

11.85%

​

03/23/23

​

09/28/29

​

368

​

​

360

​

​

366

​

1.1

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(8)(13)(14)

​

First Lien Secured Delayed Draw Loan

​

0.00%

​

SONIA

​

6.50%

​

11.71%

​

03/23/23

​

09/28/29

​

723

​

​

882

​

​

984

​

2.8

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(10)(13)(14)

​

First Lien Secured Delayed Draw Loan

​

0.50%

​

CDOR

​

6.50%

​

12.08%

​

03/23/23

​

09/28/29

​

458

​

​

324

​

​

342

​

1.0

​

Solar Holdings Bidco Limited (d/b/a SLR Consulting Ltd.)(12)(13)(14)

​

First Lien Secured Delayed Draw Loan

​

0.50%

​

SOFR

​

6.50%

​

11.85%

​

03/23/23

​

09/28/29

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

15,815

​

​

16,149

​

46.5

​

Technology Hardware, Storage & Peripherals

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

08/10/21

​

07/30/27

​

14,952

​

​

14,772

​

​

14,806

​

42.7

​

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

​

First Lien Secured Delayed Draw Loan

​

1.00%

​

SOFR

​

6.50%

​

11.96%

​

08/10/21

​

07/30/27

​

4,088

​

​

4,039

​

​

4,047

​

11.7

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

18,811

​

​

18,853

​

54.4

​

Wireless Telecommunication Services

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

​

First Lien Secured Term Loan

​

1.00%

​

SOFR

​

6.50%

​

11.88%

​

11/27/23

​

11/09/28

​

6,418

​

​

6,294

​

​

6,295

​

18.2

​

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

​

First Lien Secured Revolving Loan

​

1.00%

​

SOFR

​

6.50%

​

11.88%

​

11/27/23

​

11/09/28

​

—

​

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

6,294

​

​

6,295

​

18.2

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Total Investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

$

312,807

​

$

312,217

​

900.6

%

​

​

Forward Currency Contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

​

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

256

CAD

​

$

189 USD

​

1/27/2023

​

$

—

​

$

(1)

Morgan Stanley

​

€

1,111

EUR

​

$

1,128 USD

​

1/27/2023

​

​

—

​

​

(64)

Morgan Stanley

​

£

229

GBP

​

$

266 USD

​

1/27/2023

​

​

—

​

​

(10)

Total

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(75)

(1)Except as noted, all investments provide collateral for the STRS JV Credit Facility.
(2)The investments bear interest at a rate that may be determined by reference to LIBOR, which resets monthly, quarterly or semiannually, SOFR, CDOR, Prime, or EurIBOR.
(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 900.6% of STRS JV’s members’ equity or 94.0% 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.
(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 CDOR. The Floor, Spread Above Index and Interest Rate presented represent the weighted average of both contracts.
(12)Principal amount is non-USD denominated and is based in British pounds. At the option of the borrower, amounts borrowed under the delayed draw term loan commitment can be U.S. dollars, Canadian dollars or British pounds.
(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)The issuer is domiciled in the United Kingdom.

​

As of 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 which is domiciled in the United Kingdom. As of December 31, 2023, 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 December 31, 2024 and December 31, 2023, STRS JV had no investments on non-accrual status. STRS JV had outstanding commitments to fund investments totaling $24,724, and $21,063 under delayed draw term loan commitments and undrawn revolvers as of December 31, 2024 and December 31, 2023, respectively.

​

Below is certain summarized financial information for STRS JV as of December 31, 2024 and December 31, 2023 and for the years ended December 31, 2024, 2023 and 2022:

​

​

​

​

​

​

​

​

Selected Balance Sheet Information ($ in thousands)

​

As of December 31, 2024

​

As of December 31, 2023

Assets

 

​

  

 

​

  

Investments, at fair value (amortized cost of $296,752 and $312,807, respectively)

​

$

294,957

​

$

312,217

Cash and cash equivalents

​

 

12,454

​

 

14,625

Interest receivable

​

​

1,427

​

​

2,540

Amounts receivable on unsettled investment transactions

​

​

143

​

​

2,687

Unrealized appreciation on foreign currency forward contracts

​

​

64

​

​

—

Other assets

​

 

32

​

 

91

Total assets

​

$

309,077

​

$

332,160

Liabilities

​

 

  

​

 

  

Credit facility (net of unamortized debt issuance costs of $3,024 and $1,850, respectively)

​

$

141,057

​

$

163,394

Note payable to members

​

 

128,459

​

 

128,459

Interest payable on credit facility

​

 

807

​

 

1,013

Interest payable on notes to members

​

 

3,589

​

 

3,799

Unrealized depreciation on foreign currency forward contracts

​

​

—

​

​

172

Other liabilities

​

 

558

​

 

657

Total liabilities

​

 

274,470

​

 

297,494

Members’ equity

​

 

34,607

​

 

34,666

Total liabilities and members’ equity

​

$

309,077

​

$

332,160

​

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended December 31,

Selected Statement of Operations Information ($ in thousands)

    

2024

​

2023

    

2022

Interest and fee income

​

$

39,833

​

$

40,334

​

$

28,956

Total investment income

​

$

39,833

​

$

40,334

​

$

28,956

Interest expense on credit facility

​

 

14,433

​

 

14,558

​

 

7,470

Interest expense on notes to members

​

 

14,971

​

 

14,403

​

 

9,680

Administrative fee

​

 

651

​

 

652

​

 

629

Other expenses

​

 

816

​

 

636

​

 

564

Total expenses

​

$

30,871

​

$

30,249

​

$

18,343

Net investment income

​

 

8,962

​

 

10,085

​

 

10,613

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

​

 

91

​

 

312

​

 

329

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

​

 

1,329

​

 

1,229

​

 

(875)

Net increase in members’ equity resulting from operations

​

$

10,382

​

$

11,626

​

$

10,067

​
v3.25.1
FAIR VALUE MEASUREMENTS
 12 Months Ended
Dec. 31, 2024
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 year ended December 31, 2024 and year ended December 31, 2023, 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 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 investments (as shown on the consolidated schedule of investments) that were measured at fair value as of December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Level 1

    

Level 2

    

Level 3

​

Total

First lien secured loans

​

$

—

​

$

—

​

$

553,085

​

$

553,085

Second lien secured loans

​

 

—

​

 

—

​

 

19,039

​

 

19,039

Unsecured loans

​

​

—

​

 

—

​

 

167

​

 

167

Subordinated Note to STRS JV

​

 

—

​

 

—

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

—

​

 

—

​

 

16,679

​

 

16,679

Equity in STRS JV(1)

​

 

—

​

 

—

​

 

—

​

 

22,782

Total investments

​

$

—

​

$

—

​

$

673,386

​

$

696,168

(1)The Company’s equity investment in STRS JV is measured using the NAV 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 $11,312 as of December 31, 2023, are characterized in Level 1 of the fair value hierarchy.

The Company’s forward currency contracts, which were valued at ($43) as of December 31, 2023, 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 year ended December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Year ended December 31, 2024

​

Loans

​

Loans

​

Loans

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

553,085

 

$

19,039

 

$

167

 

$

84,416

 

$

16,679

​

$

673,386

Funding of investments

​

 

206,830

 

 

—

 

​

—

 

 

—

 

 

453

​

 

207,283

Non-cash interest income

​

 

6,786

 

 

380

 

​

94

 

 

—

 

 

—

​

 

7,260

Accretion of discount

​

 

4,084

 

 

22

 

​

5

 

 

—

 

 

—

​

 

4,111

Proceeds from paydowns and sales

​

 

(241,304)

 

 

(2,039)

 

​

—

 

 

—

 

 

(1,403)

​

 

(244,746)

Conversions

​

 

(8,852)

 

 

(11,769)

 

​

886

 

 

—

 

 

19,735

​

 

—

Realized gains (losses)

​

 

(10,985)

 

 

(5,817)

 

​

—

 

 

—

 

 

(1,886)

​

 

(18,688)

Net unrealized appreciation (depreciation)

​

 

(6,951)

 

 

8,526

 

​

23

 

 

—

 

 

(10,732)

​

 

(9,134)

Fair value, end of period

​

$

502,693

 

$

8,342

 

$

1,175

 

$

84,416

 

$

22,846

​

$

619,472

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

​

$

(17,190)

​

$

259

​

$

23

​

$

—

​

$

(10,151)

​

$

(27,059)

​

​

The following table presents the changes in investments measured at fair value using Level 3 inputs for the year ended December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Year ended December 31, 2023

​

Loans

​

Loans

​

Notes

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

618,267

 

$

20,634

 

$

167

 

$

80,000

 

$

21,000

​

$

740,068

Funding of investments

​

 

143,792

 

 

—

 

​

—

 

 

4,416

 

 

1,216

​

 

149,424

Non-cash interest income

​

 

5,471

 

 

267

 

​

—

 

 

—

 

 

—

​

 

5,738

Accretion of discount (premium)

​

 

4,411

 

 

82

 

​

—

 

 

—

 

 

—

​

 

4,493

Proceeds from paydowns and sales

​

 

(195,496)

 

 

(233)

 

​

—

 

 

—

 

 

(6,605)

​

 

(202,334)

Conversions

​

 

(7,232)

 

 

2,695

 

​

—

 

 

—

 

 

4,537

​

 

—

Realized gains (losses)

​

 

(518)

 

 

22

 

​

—

 

 

—

 

 

(338)

​

 

(834)

Net unrealized appreciation (depreciation)

​

 

(15,610)

 

 

(4,428)

 

​

—

 

 

—

 

 

(3,131)

​

 

(23,169)

Fair value, end of period

​

$

553,085

 

$

19,039

 

$

167

 

$

84,416

 

$

16,679

​

$

673,386

Change in unrealized appreciation (depreciation) on investments still held as of December 31, 2023

​

$

(17,346)

​

$

(4,430)

​

$

—

​

$

—

​

$

(3,694)

​

$

(25,471)

​

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 December 31, 2024 and December 31, 2023. 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

​

​

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.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Fair Value as of

​

Valuation

​

Unobservable

​

Range

Investment Type

​

​

December 31, 2023

​

Techniques

​

Inputs

​

(Weighted Average)(1)

First lien secured loans

​

$

507,946

​

Discounted cash flow analysis

​

Discount rate

​

11.0% - 30.3% (13.9%)

​

​

​

34,016

​

Recent transaction

​

Transaction price

​

89.0 - 98.8 (96.2)

​

​

​

10,477

​

Enterprise value analysis

​

EBITDA multiple

​

8.6 - 8.6 (8.6)

​

​

​

646

​

Option pricing Model

​

Volatility

​

17.2 - 17.2 (17.2)

Second lien secured loans

​

​

17,438

​

Discounted cash flow analysis

​

Discount rate

​

11.4% - 24.0% (18.8%)

​

​

​

1,601

​

Enterprise value analysis

​

EBITDA multiple

​

6.3 - 6.3 (6.3)

Unsecured loans

​

​

167

​

Enterprise value analysis

​

EBITDA multiple

​

7.1 - 7.1 (7.1)

Subordinated Notes to STRS JV

​

​

84,416

​

Enterprise value analysis

​

n/a

​

n/a

Common equity

​

​

3,175

​

Discounted cash flow analysis

​

Discount rate

​

14.7% - 30.3% (16.6%)

​

​

​

6,927

​

Enterprise value analysis

​

EBITDA multiple

​

5.5 - 13.2 (8.8)

​

​

​

709

​

Recent transaction

​

Transaction price

​

1.0 - 1.0 (1.0)

Preferred equity

​

​

832

​

Discounted cash flow analysis

​

Discount rate

​

29.9% - 30.3% (29.9%)

​

​

​

1,511

​

Enterprise value analysis

​

EBITDA multiple

​

6.0 - 10.5 (6.7)

Warrant

​

​

3,525

​

Discounted cash flow analysis

​

Discount rate

​

26.2% - 30.2% (26.3%)

Total Level 3 Investments

​

$

673,386

​

​

​

​

​

​

(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 December 31, 2024 and December 31, 2023. As of December 31, 2024 and December 31, 2023, the Credit Facility (as defined in Note 6) approximates its carrying value presented net of unamortized debt issuances costs and 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 December 31, 2024, the fair value of the 7.875% 2028 Notes (the “7.875% 2028 Notes”) approximates the principal amounts outstanding. As of December 31, 2023, the fair value of the 7.875% notes due 2028 were estimated using a of discounted future cash flows to the valuation date and the carrying value presented net of unamortized debt issuance costs and original issuance discount, net of accretion.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2024

​

As of December 31, 2023

​

​

Fair

​

​

​

​

​

​

​

​

​

​

​

    

Value Level

    

Principal Amount Outstanding

    

Fair Value

    

Principal Amount Outstanding

    

Fair Value

JPM Credit Facility

 

3

​

$

161,493

​

$

160,745

​

$

196,512

​

$

194,926

5.375% 2025 Notes

 

3

​

 

40,000

​

 

39,594

​

​

40,000

​

​

38,369

5.375% 2026 Notes

​

3

​

​

10,000

​

​

9,765

​

 

10,000

​

 

9,365

4.000% 2026 Notes

 

3

​

 

75,000

​

 

71,342

​

 

75,000

​

 

67,511

5.625% 2027 Notes

 

3

​

 

10,000

​

 

9,719

​

​

10,000

​

 

9,261

4.250% 2028 Notes

​

3

​

​

25,000

​

 

22,911

​

​

25,000

​

​

21,379

7.875% 2028 Notes

​

3

​

​

34,500

​

​

34,500

​

​

34,500

​

 

34,365

​

​

​

​

$

355,993

​

$

348,576

​

$

391,012

​

$

375,176

​
v3.25.1
BORROWINGS
 12 Months Ended
Dec. 31, 2024
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 December 31, 2024 and December 31, 2023, the Company’s asset coverage for borrowed amounts was 180.4% and 181.0%, respectively.

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.

Total borrowings outstanding and available as of December 31, 2023, were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Maturity

    

Rate

    

Principal Amount Outstanding

    

Amortized Cost

    

Available

JPM Credit Facility(1)

 

11/22/2025

 

S+2.500

%  

$

196,512

​

$

194,926

​

$

138,488

5.375% 2025 Notes

 

10/20/2025

 

5.375

%  

 

40,000

​

 

39,761

​

 

—

5.375% 2026 Notes

 

12/4/2026

 

5.375

%  

 

10,000

​

 

9,914

​

 

—

4.000% 2026 Notes

 

12/15/2026

 

4.000

%  

 

75,000

​

 

73,992

​

 

—

5.625% 2027 Notes

 

12/4/2027

 

5.625

%  

 

10,000

​

 

9,901

​

 

—

4.250% 2028 Notes

​

12/6/2028

​

4.250

%  

​

25,000

​

​

24,745

​

​

—

7.875% 2028 Notes

​

9/15/2028

​

7.875

%  

​

34,500

​

​

33,209

​

​

—

Total debt

 

​

​

​

​

$

391,012

​

$

386,448

​

$

138,488

(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 and lender.

On January 4, 2022, the terms of the Credit Facility were amended to, among other things, 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, among other things (i) increase WhiteHorse Credit’s availability under the Credit Facility from $285,000 to $310,000 (the “$25,000 Increase”), (ii) increase the minimum funding

amount from $200,000 to $217,000, (iii) extend an additional temporary increase of $25,000 in availability under the Credit Facility, allowing WhiteHorse Credit to borrow up to $335,000 through April 4, 2022 (the “$25,000 Temporary Increase”), and (iv) apply an annual interest rate equal to applicable SOFR plus 2.50% to any borrowings under the $25,000 Increase in the Credit Facility and the $25,000 Temporary Increase in availability under the Credit Facility.

On March 30, 2022, the terms of the Credit Facility were further amended to, among other things: (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, among other things, (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 November 21, 2024, the terms of the Credit Facility were amended to extend the reinvestment period by one month to from November 22, 2024 to December 22, 2024.

On December 19, 2024, the terms of the Credit Facility were amended to extend the reinvestment period by one month to from December 22, 2024 to January 22, 2025.

The Credit Facility bears interest at SOFR plus 2.50% 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 2.35% on outstanding borrowings. The Company is required to pay a non-usage fee which accrues at 0.75% 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 $512,210 as of December 31, 2024 as collateral. The Credit Facility has a maturity date of November 22, 2025.

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 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.

As of December 31, 2023, the Company had $196,512 in outstanding borrowings and $138,488 undrawn under the Credit Facility. For the year ended December 31, 2023, weighted average outstanding borrowings were $236,969 at a weighted average interest rate of 7.58%. As of December 31, 2023, the interest rate in effect on outstanding borrowings was 7.87%. 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, 2023, $138,488 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.”

6.000% 2023 Notes: On July 13, 2018, the Company entered into an agreement (the “2023 Note Purchase Agreement”) to sell in a private offering $30,000 aggregate principal amount of senior unsecured notes to qualified institutional investors in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended. Interest on the 6.000% 2023 Notes was payable semiannually on February 7 and August 7, at a fixed, annual rate of 6.00%. This interest rate was subject to increase (up to 6.50%) in the event that, subject to certain exceptions, the 6.000% 2023 Notes cease to have an investment grade rating. The 6.000% 2023 Notes were general unsecured obligations of the Company that ranked pari passu with all outstanding and future unsecured unsubordinated indebtedness issued by the Company. The closing of the transaction occurred on August 7, 2018. On August 7, 2023, the 6.000% 2023 Notes matured and were fully repaid by the Company.
v3.25.1
RELATED PARTY TRANSACTIONS
 12 Months Ended
Dec. 31, 2024
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 November 1, 2023, at an in-person meeting, the Company’s board of directors approved an amended and restated investment advisory agreement, which was executed by the Company on February 22, 2024 (the “Investment Advisory Agreement”). The Company’s board of directors most recently re-approved the Investment Advisory Agreement on October 30, 2024. 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 our management fee expenses for the years ended December 31, 2024, 2023 and 2022:

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 

Management Fees ($ in thousands)

    

​

2024

​

​

2023

​

​

2022

Base management fees

​

$

12,127

​

$

14,684

​

$

15,600

Total management fees

​

$

12,127

​

$

14,684

​

$

15,600

​

As of December 31, 2024 and December 31, 2023, management fees payable on the consolidated statements of assets and liabilities were $2,932 and $3,595, 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 years ended December 31, 2024, 2023 and 2022:

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 

Performance-based Incentive Fees ($ in thousands)

    

​

2024

​

​

2023

​

​

2022

Income incentive fee

​

$

9,309

​

$

10,678

​

$

8,862

Capital gains incentive fee

​

​

—

​

​

—

​

​

(1,803)

Total performance-based incentive fees

​

$

9,309

​

$

10,678

​

$

7,059

​

As of December 31, 2024 and December 31, 2023, incentive fees payable on the consolidated statements of assets and liabilities were $17,848 and $10,470, respectively. As of both December 31, 2024 and December 31, 2023, there were no 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 each of the years ended December 31, 2024, 2023 and 2022, the Company incurred allocated administrative service fees of $683.

Co-investments with Related Parties: As of December 31, 2024 and December 31, 2023, no officers or employees affiliated with or employed by WhiteHorse Advisers and its related entities maintained any co-investments in the Company’s investments.

As of December 31, 2024 and December 31, 2023, certain funds affiliated with WhiteHorse Advisers and its related entities maintained co-investments in the Company’s investments of $5,890,052 and $4,977,275, respectively.

STRS JV: For the year ended December 31, 2024 and December 31, 2023, the Company sold $59,190 and $74,939 of investments to STRS JV and recognized a net realized loss of $15 and a net realized loss of $101, respectively.

v3.25.1
COMMITMENTS AND CONTINGENCIES
 12 Months Ended
Dec. 31, 2024
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.

As of December 31, 2024 and December 31, 2023, the balance of unfunded commitments to extend credit was $26,385 and $21,440, 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 December 31, 2024 and December 31, 2023:

​

​

​

​

​

​

​

​

Unfunded Commitments ($ in thousands)

    

As of December 31, 2024

    

As of December 31, 2023

Revolving Loan Commitments:

​

​

​

​

​

​

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

​

$

—

​

$

447

Branford Filtration, LLC (d/b/a Clean Solutions Group)

​

​

—

​

​

387

Bridgepoint Healthcare, LLC

​

​

1,350

​

​

1,588

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

​

​

459

​

​

—

Claridge Products and Equipment, LLC

​

​

70

​

​

351

Coastal Television Broadcasting Group LLC

​

​

309

​

​

309

EducationDynamics, LLC

​

​

1,199

​

​

1,199

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

​

​

194

​

​

647

HC Salon Holdings, Inc. (d/b/a Hair Cuttery)

​

​

—

​

​

700

Leviathan Intermediate Holdco, LLC

​

​

570

​

​

570

LogicMonitor, Inc.

​

​

778

​

​

—

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

​

​

246

​

​

572

Motivational Marketing, LLC (d/b/a Motivational Fulfillment)

​

​

—

​

​

709

MSI Information Services, Inc.

​

​

—

​

​

225

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

​

​

238

​

​

238

Naviga Inc. (f/k/a Newscycle Solutions, Inc.)

​

​

—

​

​

30

PANOS Brands, LLC

​

​

384

​

​

—

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

​

​

880

​

​

—

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

​

​

861

​

​

610

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

​

​

87

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

​

​

—

​

​

798

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

​

​

553

​

​

—

Trailhead Media LLC

​

​

870

​

​

—

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

​

​

515

​

​

—

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

​

​

1,195

​

​

—

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

​

​

1,806

​

​

—

Total unfunded revolving loan commitments

​

​

15,510

​

​

12,113

​

​

​

​

​

​

​

Delayed Draw Loan Commitments:

​

​

​

​

​

​

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

​

​

1,422

​

​

—

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

​

​

1,756

​

​

—

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

​

​

—

​

​

140

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

​

​

—

​

​

895

Kelso Industries LLC

​

​

1,389

​

​

—

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

​

​

—

​

​

648

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

​

​

861

​

​

1,407

StoicLane MidCo, LLC (d/b/a StoicLane Inc.)

​

​

—

​

​

6,237

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

​

​

878

​

​

—

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

​

​

1,107

​

​

—

Trailhead Media LLC

​

​

2,174

​

​

—

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

​

​

1,288

​

​

—

Total unfunded delayed draw loan commitments

​

​

10,875

​

​

9,327

Total Unfunded Commitments

​

$

26,385

​

$

21,440

(1)Unfunded commitments denominated in non-USD currencies have been converted to USD using the exchange rate as of the applicable reporting date.

​

As of both December 31, 2024 and December 31, 2023, 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
 12 Months Ended
Dec. 31, 2024
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 years ended December 31, 2024 or 2023, respectively.

​
v3.25.1
FINANCIAL HIGHLIGHTS
 12 Months Ended
Dec. 31, 2024
FINANCIAL HIGHLIGHTS  
FINANCIAL HIGHLIGHTS

NOTE 10 - FINANCIAL HIGHLIGHTS

The following is a schedule of financial highlights:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Year Ended December 31, 

 

​

    

2024

    

2023

    

2022

    

2021

    

2020

 

Per share data:(1)

​

​

  

 

​

  

 

​

  

 

​

  

 

​

  

​

Net asset value, beginning of period

​

$

13.63

 

$

14.30

 

$

15.10

 

$

15.23

 

$

15.23

​

Net investment income

​

 

1.60

 

 

1.84

 

​

1.60

 

​

1.36

 

​

1.18

​

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

​

 

(1.13)

 

 

(0.96)

 

​

(0.93)

 

​

0.07

 

​

0.37

​

Net increase in net assets resulting from operations

​

 

0.47

 

 

0.88

 

​

0.67

 

​

1.43

 

​

1.55

​

Distributions declared from net investment income

​

 

(1.79)

 

 

(1.55)

 

​

(1.47)

 

​

(1.56)

 

​

(1.55)

​

Net asset value, end of period

​

$

12.31

 

$

13.63

 

$

14.30

 

$

15.10

 

$

15.23

​

Total annualized return based on market value(2)

​

 

(21.30)

%  

 

(5.75)

%  

​

(15.81)

%  

​

13.89

%  

​

(0.66)

%  

Total annualized return based on net asset value

​

 

3.49

%  

 

6.20

%  

​

4.55

%  

​

9.21

%  

​

10.36

%  

Net assets, end of period

​

$

286,134

​

$

316,772

​

$

332,387

​

$

349,751

​

$

312,897

​

Per share market value at end of period

​

$

9.68

​

$

12.30

​

$

13.05

​

$

15.50

​

$

13.61

​

Shares outstanding end of period

​

 

23,243,088

​

 

23,243,088

​

 

23,243,088

​

 

23,162,667

​

 

20,546,032

​

Ratios/Supplemental Data:(3)

​

 

  

​

 

  

​

 

  

​

 

  

​

 

  

​

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

​

 

14.89

%  

 

15.16

%  

 

12.54

%  

 

10.96

%  

 

9.78

%  

Ratio of incentive fees to average net assets

​

 

2.99

%  

 

3.25

%  

 

2.04

%  

 

2.30

%  

 

2.49

%  

Ratio of total expenses to average net assets(4)

​

 

17.88

%  

 

18.41

%  

 

14.58

%  

 

13.26

%  

 

12.27

%  

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

​

 

11.98

%  

 

12.98

%  

 

10.81

%  

 

8.81

%  

 

7.90

%  

Portfolio turnover ratio

​

 

30.93

%  

 

19.91

%  

 

35.81

%  

 

60.79

%  

 

35.86

%  

(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
 12 Months Ended
Dec. 31, 2024
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:

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended December 31, 

($ in thousands except share and per share amounts)

    

2024

    

2023

2022

Net increase (decrease) in net assets resulting from operations

​

$

10,851

​

$

20,412

$

15,683

Weighted average shares outstanding

​

 

23,243,088

​

 

23,243,088

 

23,229,552

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

​

$

0.47

​

$

0.88

$

0.68

​
v3.25.1
INCOME TAXES
 12 Months Ended
Dec. 31, 2024
INCOME TAXES  
INCOME TAXES

NOTE 12 – INCOME TAXES

The Company has elected to be treated as a RIC under Subchapter M of the Code, and as a result must distribute substantially all of its taxable income. Accordingly, no provision for federal income tax has been made in the consolidated financial statements.

The Company distributed 100% of its taxable income in each of its fiscal and taxable years.

Distributions from net investment income and distributions from net realized capital gains are determined in accordance with U.S. federal tax regulations, which may differ from amounts determined in accordance with GAAP and those differences could be material. These book-to-tax differences are either temporary or permanent in nature. Reclassifications due to permanent book-tax differences have no impact on net assets. Such reclassifications have been reflected in the consolidated statements of changes in net assets.

The reconciliation of net increase in net assets resulting from operations to taxable income is as follows:

​

​

​

​

​

​

​

​

​

​

​

​

    

Year ended December 31, 

($ in thousands)

​

2024

    

2023

    

2022

Net increase (decrease) in net assets resulting from operations

​

$

10,851

​

$

20,412

​

$

15,683

Change in net unrealized (appreciation) depreciation on investments and foreign currency

​

 

8,406

​

 

23,247

​

 

7,307

Other book-to-tax differences

​

 

18,089

​

 

205

​

 

9,498

Taxable income before deductions for distributions

​

$

37,346

​

$

43,864

​

$

32,488

​

The tax character of distributions was as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Year ended December 31, 

 

($ in thousands)

​

2024

    

2023

    

2022

 

Ordinary income

​

$

41,489

    

100.0

%  

$

36,027

    

100.0

%  

$

34,150

    

100.0

%

Return of capital

​

 

—

 

—

​

 

—

 

—

​

 

—

 

—

​

Long-term capital gains

​

 

—

 

—

​

 

—

 

—

​

 

—

 

—

​

Total distributions

​

$

41,489

 

100.0

%  

$

36,027

 

100.0

%  

$

34,150

 

100.0

%

​

The Company may make certain adjustments to the classification of stockholders’ equity as a result of permanent book-to-tax differences. During the current fiscal year, permanent differences primarily due to nondeductible federal taxes resulted in a net increase in accumulated undistributed net investment income and a net decrease in paid-in capital.

​

As of December 31, 2024, 2023 and 2022, the tax basis components of distributable earnings were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

    

Year ended December 31, 

($ in thousands)

​

2024

    

2023

    

2022

Ordinary income

​

$

28,366

​

$

31,874

​

$

24,217

Accumulated capital and other losses

​

 

(27,935)

​

 

—

​

 

—

Net unrealized (depreciation) appreciation on investments and foreign currency

​

 

(54,509)

​

 

(54,020)

​

 

(22,287)

Distributions deferred

​

 

—

​

 

—

​

 

—

Total (accumulated deficit) distributable earnings – tax basis

​

$

(54,078)

​

$

(22,146)

​

$

1,930

​

There were no late year ordinary losses for the fiscal years ended December 31, 2024, December 31, 2023 and December 31, 2022.

For tax purposes, net capital losses may be carried over to offset future capital gains, if any. The Company is permitted to carry forward capital losses incurred for an unlimited period, and such losses will retain their character as either short-term or long-term capital losses. As of December 31, 2024 and 2023, the Company had $22,269 and $8,123, respectively of long-term capital loss carryforwards. As of December 31, 2024 and 2023, the Company had $5,666 and zero, respectively of short-term capital loss carryforwards.

As of December 31, 2024, the cost of investments for U.S. federal income tax purposes was $711,668, resulting in net unrealized depreciation of $56,206. This is comprised of gross unrealized appreciation of $13,700 and gross unrealized depreciation of $69,906 on a tax basis. As of December 31, 2023, the cost of investments for U.S. federal income tax purposes was $751,117, resulting in net unrealized depreciation of $54,949. This is comprised of gross unrealized appreciation of $6,881 and gross unrealized depreciation of $61,830 on a tax basis.

The Company did not have any uncertain tax positions that met the recognition or measurement criteria of ASC 740-10-25, Income Taxes, nor did the Company have any unrecognized tax benefits as of the period presented herein. Although the Company files federal and state tax returns, its major tax jurisdiction is federal. Tax returns for each of the federal tax years since 2020 remain subject to examination by the Internal Revenue Service.
v3.25.1
SEGMENT REPORTING
 12 Months Ended
Dec. 31, 2024
SEGMENT REPORTING  
SEGMENT REPORTING

NOTE 13 – 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
 12 Months Ended
Dec. 31, 2024
SUBSEQUENT EVENTS  
SUBSEQUENT EVENTS

NOTE 14 - SUBSEQUENT EVENTS

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

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.
v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)
 12 Months Ended
Dec. 31, 2024
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 PMA Holdco Blocker, LLC, 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-K 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 will be 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 trustee 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 December 31, 2024 and December 31, 2023.

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 December 31, 2024 or December 31, 2023. 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 2020 remain subject to examination by the Internal Revenue Service.
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 2023, the FASB issued ASU 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures,” or ASU 2023-07. ASU 2023-07 enhances the disclosures required for reportable segments on an annual and interim basis. ASU 2023-07 is effective on a retrospective basis for annual periods beginning after December 15, 2023, for interim periods within fiscal years beginning after December 15, 2024, and early adoption is permitted. Management has adopted ASU 2023-07 effective December 31, 2024 and application of the guidance did not have a material impact on the Company’s consolidated financial statements. See Note 13 for more information on the adoption of ASU 2023-07.

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)
 12 Months Ended
Dec. 31, 2024
FORWARD CURRENCY CONTRACTS  
Schedule of forward currency contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 

($ in thousands)

    

​

2024

​

​

2023

​

​

2022

Realized gain (loss) on forward currency contracts

​

$

13

​

$

27

​

$

(3)

Unrealized appreciation (depreciation) on forward currency contracts

​

​

63

​

​

(40)

​

​

—

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

​

$

76

​

$

(13)

​

$

(3)

​

​

​

​

​

​

​

​

​

​
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

​

2/4/25

​

$

20

​

$

—

Total

​

​

​

​

​

​

​

​

​

​

​

$

20

​

$

—

​

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. Open contracts as of December 31, 2023 were as follows:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

1,253

CAD

​

$

903

USD

​

2/7/24

​

$

—

​

$

(43)

Total

​

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(43)
Schedule of notional exposure to foreign currency forward contracts

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31,

Average USD notional outstanding

    

    

​

2024

​

​

2023

Forward currency contracts

​

​

$

965

​

$

587
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.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2023

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)

​

$

—

​

$

43

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

43

Total

​

$

—

​

$

43

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

—

​

$

43

(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)
 12 Months Ended
Dec. 31, 2024
Schedule of Investments [Line Items]  
Schedule of individual investments

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

As of December 31, 2024

​

As of December 31, 2023

​

    

Amortized Cost

    

Fair Value

    

Amortized Cost

    

Fair Value

First lien secured loans

​

$

538,078

​

$

502,693

​

$

581,518

​

$

553,085

Second lien secured loans

​

 

8,295

​

 

8,342

​

 

27,520

​

 

19,039

Unsecured loans

​

​

1,152

​

 

1,175

​

​

167

​

 

167

Subordinated Note to STRS JV

​

 

84,416

​

 

84,416

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

42,195

​

 

22,846

​

 

25,296

​

 

16,679

Equity in STRS JV

​

 

21,104

​

 

22,741

​

 

21,104

​

 

22,782

Total

​

$

695,240

​

$

642,213

​

$

740,021

​

$

696,168

​

​

​

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

​

​

​

​

​

​

​

​

​

​

​

​

Industry ($ in thousands)

​

As of December 31, 2024

​

As of December 31, 2023

​

Advertising

    

$

17,451

    

3.3

%  

$

420

    

0.1

%

Air Freight & Logistics

​

​

28,518

​

5.3

​

​

22,616

​

3.8

​

Application Software

​

​

26,924

​

5.0

​

​

34,202

​

5.8

​

Automotive Retail

​

​

—

​

—

​

​

12,407

​

2.1

​

Broadcasting

​

​

7,833

​

1.5

​

​

7,243

​

1.2

​

Broadline Retail

​

​

5,336

​

1.0

​

​

19,911

​

3.4

​

Building Products

​

​

13,206

​

2.5

​

​

15,863

​

2.7

​

Commodity Chemicals

​

​

16,026

​

3.0

​

​

30,712

​

5.2

​

Construction & Engineering

​

​

3,927

​

0.7

​

​

541

​

0.1

​

Construction Materials

​

​

5,640

​

1.1

​

​

6,901

​

1.2

​

Data Processing & Outsourced Services

​

​

28,572

​

5.3

​

​

33,997

​

5.8

​

Distributors

​

​

10,690

​

2.0

​

​

12,475

​

2.1

​

Diversified Chemicals

​

​

4,999

​

0.9

​

​

10,259

​

1.7

​

Diversified Financial Services

​

​

—

​

—

​

​

3,472

​

0.6

​

Diversified Support Services

​

​

9,563

​

1.8

​

​

9,598

​

1.6

​

Education Services

​

​

21,314

​

4.0

​

​

20,318

​

3.5

​

Electric Utilities

​

​

16,032

​

3.0

​

​

15,954

​

2.7

​

Environmental & Facilities Services

​

​

1,400

​

0.3

​

​

23,878

​

4.1

​

Food Distributors

​

​

350

​

0.1

​

​

—

​

—

​

Health Care Facilities

​

​

8,660

​

1.6

​

​

8,966

​

1.5

​

Health Care Services

​

​

19,589

​

3.7

​

​

17,643

​

3.0

​

Health Care Supplies

​

​

19,535

​

3.7

​

​

18,983

​

3.2

​

Heavy Electrical Equipment

​

​

10,138

​

1.9

​

​

10,135

​

1.7

​

Home Furnishings

​

​

25,376

​

4.7

​

​

27,508

​

4.7

​

Household Appliances

​

​

22,162

​

4.1

​

​

22,727

​

3.9

​

Household Products

​

​

11,656

​

2.2

​

​

10,873

​

1.9

​

Industrial Machinery & Supplies & Components

​

​

13,237

​

2.5

​

​

6,417

​

1.2

​

Integrated Telecommunication Services

​

​

13,135

​

2.5

​

​

13,191

​

2.2

​

Interactive Media & Services

​

​

15,970

​

3.0

​

​

1,615

​

0.3

​

Investment Banking & Brokerage

​

​

—

​

—

​

​

3,522

​

0.6

​

IT Consulting & Other Services

​

​

3,504

​

0.6

​

​

6,549

​

1.1

​

Leisure Facilities

​

​

19,580

​

3.7

​

​

22,619

​

3.8

​

Leisure Products

​

​

23,298

​

4.4

​

​

18,488

​

3.1

​

Life Sciences Tools & Services

​

​

5,000

​

0.9

​

​

4,901

​

0.8

​

Office Services & Supplies

​

​

—

​

—

​

​

15,503

​

2.6

​

Packaged Foods & Meats

​

​

4,087

​

0.7

​

​

—

​

—

​

Paper & Plastic Packaging Products & Materials

​

​

—

​

—

​

​

179

​

—

​

Paper Products

​

​

9,453

​

1.8

​

​

—

​

—

​

Real Estate Services

​

​

20,872

​

3.9

​

​

22,758

​

3.9

​

Research & Consulting Services

​

​

5,295

​

0.9

​

​

8,438

​

1.4

​

Security & Alarm Services

​

​

7,070

​

1.3

​

​

—

​

—

​

Specialized Consumer Services

​

​

7,122

​

1.3

​

​

17,951

​

3.0

​

Specialized Finance(1)

​

​

—

​

—

​

​

—

​

—

​

​

​

​

​

​

​

​

​

​

​

​

​

Industry ($ in thousands)

​

As of December 31, 2024

​

As of December 31, 2023

​

Systems Software

​

​

26,398

​

4.9

​

​

11,523

​

2.0

​

Technology Hardware, Storage & Peripherals

​

​

18,072

​

3.4

​

​

16,745

​

2.8

​

Transaction & Payment Processing Services

​

​

8,066

​

1.5

​

​

—

​

—

​

Wireless Telecommunication Services

​

​

—

​

—

​

​

20,969

​

3.6

​

Total(1)

​

$

535,056

​

100.0

%

$

588,970

​

100.0

%

(1)Excludes investments in STRS JV.

As of December 31, 2024, 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 December 31, 2023, the portfolio companies underlying the investments are all located in the United States and its territories, except for Trimlite Buyer, LLC, which is domiciled in Canada. As of December 31, 2024 and December 31, 2023, the weighted average remaining term of the Company’s debt investments, excluding non-accrual investments, was approximately 3.0 years and 2.8 years, respectively.
Schedule of forward currency contracts

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

​

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

958

CAD

​

$

691 USD

​

2/7/2024

​

$

—

​

$

(33)

Morgan Stanley

​

€

1,181

EUR

​

$

1,249 USD

​

2/7/2024

​

​

—

​

​

(56)

Morgan Stanley

​

£

1,340

GBP

​

$

1,625 USD

​

2/7/2024

​

​

—

​

​

(83)

Total

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(172)

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Counterparty

    

Currency to be sold

​

    

Currency to be purchased

    

Settlement date

    

Unrealized
appreciation

    

Unrealized
depreciation

Morgan Stanley

​

C$

256

CAD

​

$

189 USD

​

1/27/2023

​

$

—

​

$

(1)

Morgan Stanley

​

€

1,111

EUR

​

$

1,128 USD

​

1/27/2023

​

​

—

​

​

(64)

Morgan Stanley

​

£

229

GBP

​

$

266 USD

​

1/27/2023

​

​

—

​

​

(10)

Total

​

​

​

​

​

​

​

​

​

​

$

—

​

$

(75)
Schedule of selected Balance Sheet Information

​

​

​

​

​

​

​

​

Selected Balance Sheet Information ($ in thousands)

​

As of December 31, 2024

​

As of December 31, 2023

Assets

 

​

  

 

​

  

Investments, at fair value (amortized cost of $296,752 and $312,807, respectively)

​

$

294,957

​

$

312,217

Cash and cash equivalents

​

 

12,454

​

 

14,625

Interest receivable

​

​

1,427

​

​

2,540

Amounts receivable on unsettled investment transactions

​

​

143

​

​

2,687

Unrealized appreciation on foreign currency forward contracts

​

​

64

​

​

—

Other assets

​

 

32

​

 

91

Total assets

​

$

309,077

​

$

332,160

Liabilities

​

 

  

​

 

  

Credit facility (net of unamortized debt issuance costs of $3,024 and $1,850, respectively)

​

$

141,057

​

$

163,394

Note payable to members

​

 

128,459

​

 

128,459

Interest payable on credit facility

​

 

807

​

 

1,013

Interest payable on notes to members

​

 

3,589

​

 

3,799

Unrealized depreciation on foreign currency forward contracts

​

​

—

​

​

172

Other liabilities

​

 

558

​

 

657

Total liabilities

​

 

274,470

​

 

297,494

Members’ equity

​

 

34,607

​

 

34,666

Total liabilities and members’ equity

​

$

309,077

​

$

332,160
Schedule of selected Statement of Operations Information

​

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended December 31,

Selected Statement of Operations Information ($ in thousands)

    

2024

​

2023

    

2022

Interest and fee income

​

$

39,833

​

$

40,334

​

$

28,956

Total investment income

​

$

39,833

​

$

40,334

​

$

28,956

Interest expense on credit facility

​

 

14,433

​

 

14,558

​

 

7,470

Interest expense on notes to members

​

 

14,971

​

 

14,403

​

 

9,680

Administrative fee

​

 

651

​

 

652

​

 

629

Other expenses

​

 

816

​

 

636

​

 

564

Total expenses

​

$

30,871

​

$

30,249

​

$

18,343

Net investment income

​

 

8,962

​

 

10,085

​

 

10,613

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

​

 

91

​

 

312

​

 

329

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

​

 

1,329

​

 

1,229

​

 

(875)

Net increase in members’ equity resulting from operations

​

$

10,382

​

$

11,626

​

$

10,067

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

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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

*

The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware limited liability company that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of limited liability company (“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.

(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 from this category to a different category.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends, interest 

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

​

​

​

​

​

​

Realized

​

Appreciation

​

December 31, 

Affiliated Person(1)

​

Asset

    

income

    

2022

    

Purchases

    

Sales

    

Gain (Loss)

    

(Depreciation)

    

2023

Non-controlled affiliates

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

 

​

  

Arcole Holding Corporation

​

Equity

​

$

84

​

$

6,380

​

$

—

​

$

(6,605)

​

$

(339)

​

$

564

​

$

—

Playmonster Group LLC

​

Priority First Lien Secured Term Loan

​

​

129

​

 

176

​

 

943

​

 

—

​

 

—

​

 

(104)

​

 

1,015

Playmonster Group LLC

​

First Lien Secured Term Loan

​

 

(85)

​

 

2,977

​

 

—

​

 

—

​

 

—

​

 

(1,614)

​

 

1,363

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

​

​

270

​

 

—

​

 

2,961

​

 

—

​

 

—

​

 

(168)

​

 

2,793

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

​

Common Units

​

​

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

​

 

—

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

​

Preferred Units

​

​

—

​

 

—

​

 

4,537

​

 

—

​

 

—

​

 

(4,286)

​

 

251

Total Non-controlled affiliates

​

​

​

$

398

​

$

9,533

​

$

8,441

​

$

(6,605)

​

$

(339)

​

$

(5,608)

​

$

5,422

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Dividends, interest 

​

Beginning

​

​

​

​

​

​

​

​

​

​

Net Change in

​

Ending Fair

​

​

​

​

and PIK

​

Fair Value as of

​

​

​

​

​

​

​

Net

​

Unrealized

​

Value as of

​

​

Type of

​

included in

​

December 31, 

​

​

​

​

​

​

​

Realized

​

Appreciation

​

December 31, 

Affiliated Person(1)

​

Asset

    

income

    

2022

    

Purchases

    

Sales

    

Gain (Loss)

    

(Depreciation)

    

2023

Controlled affiliates

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

American Crafts, LC

​

Super Priority First Lien Secured Term Loan

​

$

109

​

$

—

​

$

1,903

​

$

—

​

$

—

​

$

(25)

​

$

1,878

American Crafts, LC

​

Priority First Lien Secured Term Loan

​

​

575

​

​

—

​

​

5,105

​

​

—

​

​

—

​

​

(1,879)

​

​

3,226

American Crafts, LC

​

First Lien Secured Term Loan

​

​

568

​

​

—

​

​

7,491

​

​

—

​

​

—

​

​

(6,938)

​

​

553

American Crafts, LC

​

First Lien Secured Delayed Draw Loan

​

​

95

​

​

—

​

​

1,259

​

​

—

​

​

—

​

​

(1,166)

​

​

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

​

​

9,488

​

​

80,000

​

​

4,416

​

​

—

​

​

—

​

​

—

​

​

84,416

WHF STRS Ohio Senior Loan Fund LLC*

 

Equity

​

 

6,158

​

 

20,160

​

 

1,104

​

 

—

​

 

—

​

 

1,518

​

 

22,782

Total Controlled affiliates

 

  

​

$

16,993

​

$

100,160

​

$

21,278

​

$

—

​

$

—

​

$

(8,490)

​

$

112,948

*

The Company and STRS Ohio are the members of STRS JV, a joint venture formed as a Delaware limited liability company that is not consolidated by either member for financial reporting purposes. The members make investments in STRS JV in the form of limited liability company (“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.

(1)Refer to the consolidated schedule of investments for the principal amount, industry classification and other security detail of each portfolio company.
v3.25.1
FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2024
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 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 following table presents investments (as shown on the consolidated schedule of investments) that were measured at fair value as of December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Level 1

    

Level 2

    

Level 3

​

Total

First lien secured loans

​

$

—

​

$

—

​

$

553,085

​

$

553,085

Second lien secured loans

​

 

—

​

 

—

​

 

19,039

​

 

19,039

Unsecured loans

​

​

—

​

 

—

​

 

167

​

 

167

Subordinated Note to STRS JV

​

 

—

​

 

—

​

 

84,416

​

 

84,416

Equity (excluding STRS JV)

​

 

—

​

 

—

​

 

16,679

​

 

16,679

Equity in STRS JV(1)

​

 

—

​

 

—

​

 

—

​

 

22,782

Total investments

​

$

—

​

$

—

​

$

673,386

​

$

696,168

(1)The Company’s equity investment in STRS JV is measured using the NAV 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 year ended December 31, 2024:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Year ended December 31, 2024

​

Loans

​

Loans

​

Loans

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

553,085

 

$

19,039

 

$

167

 

$

84,416

 

$

16,679

​

$

673,386

Funding of investments

​

 

206,830

 

 

—

 

​

—

 

 

—

 

 

453

​

 

207,283

Non-cash interest income

​

 

6,786

 

 

380

 

​

94

 

 

—

 

 

—

​

 

7,260

Accretion of discount

​

 

4,084

 

 

22

 

​

5

 

 

—

 

 

—

​

 

4,111

Proceeds from paydowns and sales

​

 

(241,304)

 

 

(2,039)

 

​

—

 

 

—

 

 

(1,403)

​

 

(244,746)

Conversions

​

 

(8,852)

 

 

(11,769)

 

​

886

 

 

—

 

 

19,735

​

 

—

Realized gains (losses)

​

 

(10,985)

 

 

(5,817)

 

​

—

 

 

—

 

 

(1,886)

​

 

(18,688)

Net unrealized appreciation (depreciation)

​

 

(6,951)

 

 

8,526

 

​

23

 

 

—

 

 

(10,732)

​

 

(9,134)

Fair value, end of period

​

$

502,693

 

$

8,342

 

$

1,175

 

$

84,416

 

$

22,846

​

$

619,472

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

​

$

(17,190)

​

$

259

​

$

23

​

$

—

​

$

(10,151)

​

$

(27,059)

​

​

The following table presents the changes in investments measured at fair value using Level 3 inputs for the year ended December 31, 2023:

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

First Lien

    

Second Lien

    

​

    

Subordinated

    

​

​

    

​

​

​

​

Secured

​

Secured

​

Unsecured

​

Notes to STRS

​

​

​

​

Total

Year ended December 31, 2023

​

Loans

​

Loans

​

Notes

​

JV

​

Equity

​

Investments

Fair value, beginning of period

​

$

618,267

 

$

20,634

 

$

167

 

$

80,000

 

$

21,000

​

$

740,068

Funding of investments

​

 

143,792

 

 

—

 

​

—

 

 

4,416

 

 

1,216

​

 

149,424

Non-cash interest income

​

 

5,471

 

 

267

 

​

—

 

 

—

 

 

—

​

 

5,738

Accretion of discount (premium)

​

 

4,411

 

 

82

 

​

—

 

 

—

 

 

—

​

 

4,493

Proceeds from paydowns and sales

​

 

(195,496)

 

 

(233)

 

​

—

 

 

—

 

 

(6,605)

​

 

(202,334)

Conversions

​

 

(7,232)

 

 

2,695

 

​

—

 

 

—

 

 

4,537

​

 

—

Realized gains (losses)

​

 

(518)

 

 

22

 

​

—

 

 

—

 

 

(338)

​

 

(834)

Net unrealized appreciation (depreciation)

​

 

(15,610)

 

 

(4,428)

 

​

—

 

 

—

 

 

(3,131)

​

 

(23,169)

Fair value, end of period

​

$

553,085

 

$

19,039

 

$

167

 

$

84,416

 

$

16,679

​

$

673,386

Change in unrealized appreciation (depreciation) on investments still held as of December 31, 2023

​

$

(17,346)

​

$

(4,430)

​

$

—

​

$

—

​

$

(3,694)

​

$

(25,471)
Schedule of Quantitative information about Level 3 fair value measurements

​

​

​

​

​

​

​

​

​

​

​

​

​

​

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.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Fair Value as of

​

Valuation

​

Unobservable

​

Range

Investment Type

​

​

December 31, 2023

​

Techniques

​

Inputs

​

(Weighted Average)(1)

First lien secured loans

​

$

507,946

​

Discounted cash flow analysis

​

Discount rate

​

11.0% - 30.3% (13.9%)

​

​

​

34,016

​

Recent transaction

​

Transaction price

​

89.0 - 98.8 (96.2)

​

​

​

10,477

​

Enterprise value analysis

​

EBITDA multiple

​

8.6 - 8.6 (8.6)

​

​

​

646

​

Option pricing Model

​

Volatility

​

17.2 - 17.2 (17.2)

Second lien secured loans

​

​

17,438

​

Discounted cash flow analysis

​

Discount rate

​

11.4% - 24.0% (18.8%)

​

​

​

1,601

​

Enterprise value analysis

​

EBITDA multiple

​

6.3 - 6.3 (6.3)

Unsecured loans

​

​

167

​

Enterprise value analysis

​

EBITDA multiple

​

7.1 - 7.1 (7.1)

Subordinated Notes to STRS JV

​

​

84,416

​

Enterprise value analysis

​

n/a

​

n/a

Common equity

​

​

3,175

​

Discounted cash flow analysis

​

Discount rate

​

14.7% - 30.3% (16.6%)

​

​

​

6,927

​

Enterprise value analysis

​

EBITDA multiple

​

5.5 - 13.2 (8.8)

​

​

​

709

​

Recent transaction

​

Transaction price

​

1.0 - 1.0 (1.0)

Preferred equity

​

​

832

​

Discounted cash flow analysis

​

Discount rate

​

29.9% - 30.3% (29.9%)

​

​

​

1,511

​

Enterprise value analysis

​

EBITDA multiple

​

6.0 - 10.5 (6.7)

Warrant

​

​

3,525

​

Discounted cash flow analysis

​

Discount rate

​

26.2% - 30.2% (26.3%)

Total Level 3 Investments

​

$

673,386

​

​

​

​

​

​

(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 December 31, 2024

​

As of December 31, 2023

​

​

Fair

​

​

​

​

​

​

​

​

​

​

​

    

Value Level

    

Principal Amount Outstanding

    

Fair Value

    

Principal Amount Outstanding

    

Fair Value

JPM Credit Facility

 

3

​

$

161,493

​

$

160,745

​

$

196,512

​

$

194,926

5.375% 2025 Notes

 

3

​

 

40,000

​

 

39,594

​

​

40,000

​

​

38,369

5.375% 2026 Notes

​

3

​

​

10,000

​

​

9,765

​

 

10,000

​

 

9,365

4.000% 2026 Notes

 

3

​

 

75,000

​

 

71,342

​

 

75,000

​

 

67,511

5.625% 2027 Notes

 

3

​

 

10,000

​

 

9,719

​

​

10,000

​

 

9,261

4.250% 2028 Notes

​

3

​

​

25,000

​

 

22,911

​

​

25,000

​

​

21,379

7.875% 2028 Notes

​

3

​

​

34,500

​

​

34,500

​

​

34,500

​

 

34,365

​

​

​

​

$

355,993

​

$

348,576

​

$

391,012

​

$

375,176

​
v3.25.1
BORROWINGS (Tables)
 12 Months Ended
Dec. 31, 2024
BORROWINGS  
Schedule of borrowings outstanding and available

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

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.

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Maturity

    

Rate

    

Principal Amount Outstanding

    

Amortized Cost

    

Available

JPM Credit Facility(1)

 

11/22/2025

 

S+2.500

%  

$

196,512

​

$

194,926

​

$

138,488

5.375% 2025 Notes

 

10/20/2025

 

5.375

%  

 

40,000

​

 

39,761

​

 

—

5.375% 2026 Notes

 

12/4/2026

 

5.375

%  

 

10,000

​

 

9,914

​

 

—

4.000% 2026 Notes

 

12/15/2026

 

4.000

%  

 

75,000

​

 

73,992

​

 

—

5.625% 2027 Notes

 

12/4/2027

 

5.625

%  

 

10,000

​

 

9,901

​

 

—

4.250% 2028 Notes

​

12/6/2028

​

4.250

%  

​

25,000

​

​

24,745

​

​

—

7.875% 2028 Notes

​

9/15/2028

​

7.875

%  

​

34,500

​

​

33,209

​

​

—

Total debt

 

​

​

​

​

$

391,012

​

$

386,448

​

$

138,488

(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)
 12 Months Ended
Dec. 31, 2024
RELATED PARTY TRANSACTIONS  
Schedule of management fee expenses

The following table details our management fee expenses for the years ended December 31, 2024, 2023 and 2022:

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 

Management Fees ($ in thousands)

    

​

2024

​

​

2023

​

​

2022

Base management fees

​

$

12,127

​

$

14,684

​

$

15,600

Total management fees

​

$

12,127

​

$

14,684

​

$

15,600
Schedule of performance-based incentive fees

The following table provides a breakdown of the performance-based incentive fees for the years ended December 31, 2024, 2023 and 2022:

​

​

​

​

​

​

​

​

​

​

​

​

​

Year ended December 31, 

Performance-based Incentive Fees ($ in thousands)

    

​

2024

​

​

2023

​

​

2022

Income incentive fee

​

$

9,309

​

$

10,678

​

$

8,862

Capital gains incentive fee

​

​

—

​

​

—

​

​

(1,803)

Total performance-based incentive fees

​

$

9,309

​

$

10,678

​

$

7,059
v3.25.1
COMMITMENTS AND CONTINGENCIES (Tables)
 12 Months Ended
Dec. 31, 2024
COMMITMENTS AND CONTINGENCIES  
Schedule of unfunded commitments

​

​

​

​

​

​

​

​

Unfunded Commitments ($ in thousands)

    

As of December 31, 2024

    

As of December 31, 2023

Revolving Loan Commitments:

​

​

​

​

​

​

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

​

$

—

​

$

447

Branford Filtration, LLC (d/b/a Clean Solutions Group)

​

​

—

​

​

387

Bridgepoint Healthcare, LLC

​

​

1,350

​

​

1,588

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

​

​

459

​

​

—

Claridge Products and Equipment, LLC

​

​

70

​

​

351

Coastal Television Broadcasting Group LLC

​

​

309

​

​

309

EducationDynamics, LLC

​

​

1,199

​

​

1,199

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

​

​

194

​

​

647

HC Salon Holdings, Inc. (d/b/a Hair Cuttery)

​

​

—

​

​

700

Leviathan Intermediate Holdco, LLC

​

​

570

​

​

570

LogicMonitor, Inc.

​

​

778

​

​

—

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

​

​

246

​

​

572

Motivational Marketing, LLC (d/b/a Motivational Fulfillment)

​

​

—

​

​

709

MSI Information Services, Inc.

​

​

—

​

​

225

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

​

​

238

​

​

238

Naviga Inc. (f/k/a Newscycle Solutions, Inc.)

​

​

—

​

​

30

PANOS Brands, LLC

​

​

384

​

​

—

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

​

​

880

​

​

—

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

​

​

861

​

​

610

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

​

​

87

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

​

​

—

​

​

798

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

​

​

553

​

​

—

Trailhead Media LLC

​

​

870

​

​

—

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

​

​

515

​

​

—

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

​

​

1,195

​

​

—

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

​

​

1,806

​

​

—

Total unfunded revolving loan commitments

​

​

15,510

​

​

12,113

​

​

​

​

​

​

​

Delayed Draw Loan Commitments:

​

​

​

​

​

​

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

​

​

1,422

​

​

—

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

​

​

1,756

​

​

—

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

​

​

—

​

​

140

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

​

​

—

​

​

895

Kelso Industries LLC

​

​

1,389

​

​

—

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

​

​

—

​

​

648

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

​

​

861

​

​

1,407

StoicLane MidCo, LLC (d/b/a StoicLane Inc.)

​

​

—

​

​

6,237

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

​

​

878

​

​

—

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

​

​

1,107

​

​

—

Trailhead Media LLC

​

​

2,174

​

​

—

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

​

​

1,288

​

​

—

Total unfunded delayed draw loan commitments

​

​

10,875

​

​

9,327

Total Unfunded Commitments

​

$

26,385

​

$

21,440

(1)Unfunded commitments denominated in non-USD currencies have been converted to USD using the exchange rate as of the applicable reporting date.
v3.25.1
FINANCIAL HIGHLIGHTS (Tables)
 12 Months Ended
Dec. 31, 2024
FINANCIAL HIGHLIGHTS  
Schedule of financial highlights

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Year Ended December 31, 

 

​

    

2024

    

2023

    

2022

    

2021

    

2020

 

Per share data:(1)

​

​

  

 

​

  

 

​

  

 

​

  

 

​

  

​

Net asset value, beginning of period

​

$

13.63

 

$

14.30

 

$

15.10

 

$

15.23

 

$

15.23

​

Net investment income

​

 

1.60

 

 

1.84

 

​

1.60

 

​

1.36

 

​

1.18

​

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

​

 

(1.13)

 

 

(0.96)

 

​

(0.93)

 

​

0.07

 

​

0.37

​

Net increase in net assets resulting from operations

​

 

0.47

 

 

0.88

 

​

0.67

 

​

1.43

 

​

1.55

​

Distributions declared from net investment income

​

 

(1.79)

 

 

(1.55)

 

​

(1.47)

 

​

(1.56)

 

​

(1.55)

​

Net asset value, end of period

​

$

12.31

 

$

13.63

 

$

14.30

 

$

15.10

 

$

15.23

​

Total annualized return based on market value(2)

​

 

(21.30)

%  

 

(5.75)

%  

​

(15.81)

%  

​

13.89

%  

​

(0.66)

%  

Total annualized return based on net asset value

​

 

3.49

%  

 

6.20

%  

​

4.55

%  

​

9.21

%  

​

10.36

%  

Net assets, end of period

​

$

286,134

​

$

316,772

​

$

332,387

​

$

349,751

​

$

312,897

​

Per share market value at end of period

​

$

9.68

​

$

12.30

​

$

13.05

​

$

15.50

​

$

13.61

​

Shares outstanding end of period

​

 

23,243,088

​

 

23,243,088

​

 

23,243,088

​

 

23,162,667

​

 

20,546,032

​

Ratios/Supplemental Data:(3)

​

 

  

​

 

  

​

 

  

​

 

  

​

 

  

​

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

​

 

14.89

%  

 

15.16

%  

 

12.54

%  

 

10.96

%  

 

9.78

%  

Ratio of incentive fees to average net assets

​

 

2.99

%  

 

3.25

%  

 

2.04

%  

 

2.30

%  

 

2.49

%  

Ratio of total expenses to average net assets(4)

​

 

17.88

%  

 

18.41

%  

 

14.58

%  

 

13.26

%  

 

12.27

%  

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

​

 

11.98

%  

 

12.98

%  

 

10.81

%  

 

8.81

%  

 

7.90

%  

Portfolio turnover ratio

​

 

30.93

%  

 

19.91

%  

 

35.81

%  

 

60.79

%  

 

35.86

%  

(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)
 12 Months Ended
Dec. 31, 2024
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

​

​

​

​

​

​

​

​

​

​

​

​

Year Ended December 31, 

($ in thousands except share and per share amounts)

    

2024

    

2023

2022

Net increase (decrease) in net assets resulting from operations

​

$

10,851

​

$

20,412

$

15,683

Weighted average shares outstanding

​

 

23,243,088

​

 

23,243,088

 

23,229,552

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

​

$

0.47

​

$

0.88

$

0.68

​
v3.25.1
INCOME TAXES (Tables)
 12 Months Ended
Dec. 31, 2024
INCOME TAXES  
Schedule of reconciliation of net increase in net assets resulting from operations to taxable income

​

​

​

​

​

​

​

​

​

​

​

​

    

Year ended December 31, 

($ in thousands)

​

2024

    

2023

    

2022

Net increase (decrease) in net assets resulting from operations

​

$

10,851

​

$

20,412

​

$

15,683

Change in net unrealized (appreciation) depreciation on investments and foreign currency

​

 

8,406

​

 

23,247

​

 

7,307

Other book-to-tax differences

​

 

18,089

​

 

205

​

 

9,498

Taxable income before deductions for distributions

​

$

37,346

​

$

43,864

​

$

32,488
Schedule of tax character of distributions

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

    

Year ended December 31, 

 

($ in thousands)

​

2024

    

2023

    

2022

 

Ordinary income

​

$

41,489

    

100.0

%  

$

36,027

    

100.0

%  

$

34,150

    

100.0

%

Return of capital

​

 

—

 

—

​

 

—

 

—

​

 

—

 

—

​

Long-term capital gains

​

 

—

 

—

​

 

—

 

—

​

 

—

 

—

​

Total distributions

​

$

41,489

 

100.0

%  

$

36,027

 

100.0

%  

$

34,150

 

100.0

%
Schedule of tax basis components of distributable earnings

​

​

​

​

​

​

​

​

​

​

​

​

    

Year ended December 31, 

($ in thousands)

​

2024

    

2023

    

2022

Ordinary income

​

$

28,366

​

$

31,874

​

$

24,217

Accumulated capital and other losses

​

 

(27,935)

​

 

—

​

 

—

Net unrealized (depreciation) appreciation on investments and foreign currency

​

 

(54,509)

​

 

(54,020)

​

 

(22,287)

Distributions deferred

​

 

—

​

 

—

​

 

—

Total (accumulated deficit) distributable earnings – tax basis

​

$

(54,078)

​

$

(22,146)

​

$

1,930
v3.25.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
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 711,668 751,117
Net unrealized depreciation 56,206 54,949
Gross unrealized appreciation of investments 13,700 6,881
Gross unrealized depreciation of investments $ 69,906 $ 61,830
v3.25.1
FORWARD CURRENCY CONTRACTS - Forward Currency Contracts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
FORWARD CURRENCY CONTRACTS      
Realized gain (loss) on forward currency contracts $ (1) $ 950 $ (310)
Foreign currency forward contracts      
FORWARD CURRENCY CONTRACTS      
Realized gain (loss) on forward currency contracts 13 27 (3)
Unrealized appreciation (depreciation) on forward currency contracts 63 (40)  
Total net realized and unrealized gains (losses) on forward currency contracts $ 76 $ (13) $ (3)
v3.25.1
FORWARD CURRENCY CONTRACTS - Unrealized Appreciation or Depreciation On Forward Currency Contracts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair value    
Unrealized appreciation $ 20  
Unrealized depreciation   $ (43)
Morgan Stanley    
Fair value    
Unrealized appreciation $ 20  
Unrealized depreciation   $ (43)
Morgan Stanley | CAD    
Fair value    
Currency to be sold 796 1,253
Currency to be purchased   903
Unrealized appreciation $ 20  
Unrealized depreciation   $ (43)
Morgan Stanley | USD    
Fair value    
Currency to be purchased 574 903
v3.25.1
FORWARD CURRENCY CONTRACTS - Notional Exposure to Foreign Currency Forward Contracts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
FORWARD CURRENCY CONTRACTS      
Forward currency contracts $ 63 $ (40) $ (3)
Foreign currency forward contracts      
FORWARD CURRENCY CONTRACTS      
Forward currency contracts $ 965 $ 587  
v3.25.1
FORWARD CURRENCY CONTRACTS - Collateral Received or Pledged (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
FORWARD CURRENCY CONTRACTS    
Net Amount of Derivative Liabilities   $ 43
Foreign currency forward contracts    
FORWARD CURRENCY CONTRACTS    
Derivative Assets Subject to Master Netting Agreement $ 20  
Derivative Liabilities Subject to Master Netting Agreement   43
Net Amount of Derivative Assets 20  
Net Amount of Derivative Liabilities   43
Morgan Stanley | Foreign currency forward contracts | CAD    
FORWARD CURRENCY CONTRACTS    
Derivative Assets Subject to Master Netting Agreement 20  
Derivative Liabilities Subject to Master Netting Agreement   43
Net Amount of Derivative Assets $ 20  
Net Amount of Derivative Liabilities   $ 43
v3.25.1
INVESTMENTS - Schedule of Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Investments, amortized cost $ 695,240 $ 740,021
Investments, fair value 642,213 696,168
First lien secured loans    
Investments, amortized cost 538,078 581,518
Investments, fair value 502,693 553,085
Second lien secured loans    
Investments, amortized cost 8,295 27,520
Investments, fair value 8,342 19,039
Subordinated Notes    
Investments, amortized cost 1,152 167
Investments, fair value 1,175 167
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 25,296
Investments, fair value 22,846 16,679
Equity in STRS JV    
Investments, amortized cost 21,104 21,104
Investments, fair value $ 22,741 $ 22,782
v3.25.1
INVESTMENTS - Portfolio by Industry Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Investments, fair value $ 642,213 $ 696,168
Percent of net assets 224.40% 219.70%
Advertising    
Investments, fair value $ 12,035 $ 12,040
Air Freight & Logistics    
Investments, fair value 3,311 3,504
Broadline Retail    
Investments, fair value 17,827 18,759
Building Products    
Investments, fair value 13,437 13,313
Construction & Engineering    
Investments, fair value 16,253 9,550
Data Processing & Outsourced Services    
Investments, fair value 12,885 14,659
Distributors    
Investments, fair value 9,372  
Diversified Support Services    
Investments, fair value 19,282 19,136
Environmental & Facilities Services    
Investments, fair value 29,963 19,691
Food Distributors    
Investments, fair value 4,993  
Health Care Facilities    
Investments, fair value 8,004  
Health Care Services    
Investments, fair value 4,995 5,022
Health Care Supplies    
Investments, fair value 7,696 7,530
Household Appliances    
Investments, fair value 7,632 8,168
Industrial Machinery & Supplies & Components    
Investments, fair value   6,561
Investment Banking & Brokerage    
Investments, fair value   4,977
Packaged Foods & Meats    
Investments, fair value 7,009 6,904
Research & Consulting Services    
Investments, fair value 11,977 16,149
Technology Hardware, Storage & Peripherals    
Investments, fair value 17,949 18,853
Paper & Plastic Packaging Products & Materials    
Investments, fair value 14,881 14,913
Wireless Telecommunication Services    
Investments, fair value 6,332 6,295
Investments Excluding STRS JV's    
Investments, fair value $ 535,056 $ 588,970
Percent of net assets 100.00% 100.00%
Investments Excluding STRS JV's | Advertising    
Investments, fair value $ 17,451 $ 420
Percent of net assets 3.30% 0.10%
Investments Excluding STRS JV's | Air Freight & Logistics    
Investments, fair value $ 28,518 $ 22,616
Percent of net assets 5.30% 3.80%
Investments Excluding STRS JV's | Application Software    
Investments, fair value $ 26,924 $ 34,202
Percent of net assets 5.00% 5.80%
Investments Excluding STRS JV's | Automotive Retail    
Investments, fair value   $ 12,407
Percent of net assets   2.10%
Investments Excluding STRS JV's | Broadcasting    
Investments, fair value $ 7,833 $ 7,243
Percent of net assets 1.50% 1.20%
Investments Excluding STRS JV's | Broadline Retail    
Investments, fair value $ 5,336 $ 19,911
Percent of net assets 1.00% 3.40%
Investments Excluding STRS JV's | Building Products    
Investments, fair value $ 13,206 $ 15,863
Percent of net assets 2.50% 2.70%
Investments Excluding STRS JV's | Commodity Chemicals    
Investments, fair value $ 16,026 $ 30,712
Percent of net assets 3.00% 5.20%
Investments Excluding STRS JV's | Construction & Engineering    
Investments, fair value $ 3,927 $ 541
Percent of net assets 0.70% 0.10%
Investments Excluding STRS JV's | Construction Materials    
Investments, fair value $ 5,640 $ 6,901
Percent of net assets 1.10% 1.20%
Investments Excluding STRS JV's | Data Processing & Outsourced Services    
Investments, fair value $ 28,572 $ 33,997
Percent of net assets 5.30% 5.80%
Investments Excluding STRS JV's | Distributors    
Investments, fair value $ 10,690 $ 12,475
Percent of net assets 2.00% 2.10%
Investments Excluding STRS JV's | Diversified Chemicals    
Investments, fair value $ 4,999 $ 10,259
Percent of net assets 0.90% 1.70%
Investments Excluding STRS JV's | Diversified Financial Services    
Investments, fair value   $ 3,472
Percent of net assets   0.60%
Investments Excluding STRS JV's | Diversified Support Services    
Investments, fair value $ 9,563 $ 9,598
Percent of net assets 1.80% 1.60%
Investments Excluding STRS JV's | Education Services    
Investments, fair value $ 21,314 $ 20,318
Percent of net assets 4.00% 3.50%
Investments Excluding STRS JV's | Electric Utilities    
Investments, fair value $ 16,032 $ 15,954
Percent of net assets 3.00% 2.70%
Investments Excluding STRS JV's | Environmental & Facilities Services    
Investments, fair value $ 1,400 $ 23,878
Percent of net assets 0.30% 4.10%
Investments Excluding STRS JV's | Food Distributors    
Investments, fair value $ 350  
Percent of net assets 0.10%  
Investments Excluding STRS JV's | Health Care Facilities    
Investments, fair value $ 8,660 $ 8,966
Percent of net assets 1.60% 1.50%
Investments Excluding STRS JV's | Health Care Services    
Investments, fair value $ 19,589 $ 17,643
Percent of net assets 3.70% 3.00%
Investments Excluding STRS JV's | Health Care Supplies    
Investments, fair value $ 19,535 $ 18,983
Percent of net assets 3.70% 3.20%
Investments Excluding STRS JV's | Heavy Electrical Equipment    
Investments, fair value $ 10,138 $ 10,135
Percent of net assets 1.90% 1.70%
Investments Excluding STRS JV's | Home Furnishings    
Investments, fair value $ 25,376 $ 27,508
Percent of net assets 4.70% 4.70%
Investments Excluding STRS JV's | Household Appliances    
Investments, fair value $ 22,162 $ 22,727
Percent of net assets 4.10% 3.90%
Investments Excluding STRS JV's | Household Products    
Investments, fair value $ 11,656 $ 10,873
Percent of net assets 2.20% 1.90%
Investments Excluding STRS JV's | Industrial Machinery & Supplies & Components    
Investments, fair value $ 13,237 $ 6,417
Percent of net assets 2.50% 1.20%
Investments Excluding STRS JV's | Integrated Telecommunication Services    
Investments, fair value $ 13,135 $ 13,191
Percent of net assets 2.50% 2.20%
Investments Excluding STRS JV's | Interactive Media & Services    
Investments, fair value $ 15,970 $ 1,615
Percent of net assets 3.00% 0.30%
Investments Excluding STRS JV's | Investment Banking & Brokerage    
Investments, fair value   $ 3,522
Percent of net assets   0.60%
Investments Excluding STRS JV's | IT Consulting & Other Services    
Investments, fair value $ 3,504 $ 6,549
Percent of net assets 0.60% 1.10%
Investments Excluding STRS JV's | Leisure Facilities    
Investments, fair value $ 19,580 $ 22,619
Percent of net assets 3.70% 3.80%
Investments Excluding STRS JV's | Leisure Products    
Investments, fair value $ 23,298 $ 18,488
Percent of net assets 4.40% 3.10%
Investments Excluding STRS JV's | Life Sciences Tools & Services    
Investments, fair value $ 5,000 $ 4,901
Percent of net assets 0.90% 0.80%
Investments Excluding STRS JV's | Office Services & Supplies    
Investments, fair value   $ 15,503
Percent of net assets   2.60%
Investments Excluding STRS JV's | Packaged Foods & Meats    
Investments, fair value $ 4,087  
Percent of net assets 0.70%  
Investments Excluding STRS JV's | Paper Products    
Investments, fair value $ 9,453  
Percent of net assets 1.80%  
Investments Excluding STRS JV's | Real Estate Services    
Investments, fair value $ 20,872 $ 22,758
Percent of net assets 3.90% 3.90%
Investments Excluding STRS JV's | Research & Consulting Services    
Investments, fair value $ 5,295 $ 8,438
Percent of net assets 0.90% 1.40%
Investments Excluding STRS JV's | Security & Alarm Services    
Investments, fair value $ 7,070  
Percent of net assets 1.30%  
Investments Excluding STRS JV's | Specialized Consumer Services    
Investments, fair value $ 7,122 $ 17,951
Percent of net assets 1.30% 3.00%
Investments Excluding STRS JV's | Systems Software    
Investments, fair value $ 26,398 $ 11,523
Percent of net assets 4.90% 2.00%
Investments Excluding STRS JV's | Technology Hardware, Storage & Peripherals    
Investments, fair value $ 18,072 $ 16,745
Percent of net assets 3.40% 2.80%
Investments Excluding STRS JV's | Transaction & Payment Processing Services    
Investments, fair value $ 8,066  
Percent of net assets 1.50%  
Investments Excluding STRS JV's | Paper & Plastic Packaging Products & Materials    
Investments, fair value   $ 179
Investments Excluding STRS JV's | Wireless Telecommunication Services    
Investments, fair value   $ 20,969
Percent of net assets   3.60%
v3.25.1
INVESTMENTS - Affiliated and Controlled Persons (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Mar. 31, 2023
Investments in and Advances to Affiliates [Line Items]            
Weighted average remaining term of debt investments   3 years 2 years 9 months 18 days      
Cost basis of non-accrual loans   $ 69,576 $ 38,322      
Fair value of non-accrual loans   37,019 14,087      
Cost of investment   695,240 740,021      
Paydown received under investments   186,251 128,199 $ 239,622    
Schedule of investments in and advances to affiliated and controlled persons            
Beginning Fair Value   696,168        
Net Change in Unrealized Appreciation (Depreciation)   (9,567) (21,969) (9,191)    
Ending Fair Value   642,213 696,168      
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 78        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AbCentersAcquisitionCorporationMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 5        
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 7,866        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AbCentersAcquisitionCorporationMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 20,142 $ 20,056      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ABBCon-ciseOpticalGroupLLCMember whfcl:ABBCon-ciseOpticalGroupLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 18,983        
Ending Fair Value   19,535 $ 18,983      
Investment, Identifier [Axis]: ALM Media, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 12,555      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ALMMediaLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 12,517        
Ending Fair Value     $ 12,517      
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 6        
Investment, Identifier [Axis]: APG Lions Purchaser, LLC, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,027        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ApgLionsPurchaserLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 4,070        
Investment, Identifier [Axis]: ATSG, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 9,678      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ATSGIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   9,771        
Ending Fair Value     $ 9,771      
Investment, Identifier [Axis]: ATSG, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 3,741      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ATSGIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   3,745        
Ending Fair Value     $ 3,745      
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   $ 1,615        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AlvariaHoldcoMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 2,330        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AlvariaHoldcoMember        
Investment type   whfcl:SecondLienSecuredTermLoanMember        
Ending Fair Value   $ 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   $ 9,318        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AlvariaHoldcoMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 1,029        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AlvariaHoldcoMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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 $ 1,903      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AmericanCraftsLCMember whfcl:AmericanCraftsLCMember      
Investment type   whfcl:SuperPriorityFirstLienSecuredTermLoanMember whfcl:SuperPriorityFirstLienSecuredTermLoanMember      
Beginning Fair Value   $ 1,878        
Ending Fair Value     $ 1,878      
Investment, Identifier [Axis]: American Crafts Lc Super Priority First Lien Secured Term Loan            
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 $ 109      
Beginning Fair Value   1,878        
Gross Additions   191 1,903      
Net Change in Unrealized Appreciation (Depreciation)   (2,069) (25)      
Ending Fair Value     1,878      
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      
Dividends, interest and PIK included in income     $ 95      
Beginning Fair Value   $ 93        
Gross Additions     1,259      
Net Change in Unrealized Appreciation (Depreciation)   (93) (1,166)      
Ending Fair Value     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   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Dividends, interest and PIK included in income     $ 568      
Beginning Fair Value   $ 553        
Gross Additions     7,491      
Net Change in Unrealized Appreciation (Depreciation)   (553) (6,938)      
Ending Fair Value     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 $ 575      
Beginning Fair Value   3,226        
Gross Additions     5,105      
Net Change in Unrealized Appreciation (Depreciation)   (3,226) (1,879)      
Ending Fair Value     $ 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        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AmericanCraftsLCMember        
Investment type   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember        
Dividends, interest and PIK included in income   $ 107        
Gross Additions   2,374        
Net Change in Unrealized Appreciation (Depreciation)   (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        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AmericanCraftsLCMember        
Investment type   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember        
Investment, Identifier [Axis]: American Crafts, LC Super Senior Priority First Lien Secured Term Loan one            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:AmericanCraftsLCMember        
Investment type   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]: Arcole Holding Corporation            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ArcoleHoldingCorporationMember      
Investment, Identifier [Axis]: Arcole Holding Corporation, Equity            
Schedule of investments in and advances to affiliated and controlled persons            
Investment type     Equity (excluding STRS JV)      
Dividends, interest and PIK included in income     $ 84      
Beginning Fair Value     6,380      
Gross Reductions     (6,605)      
Net Realized Gain (Loss)     (339)      
Net Change in Unrealized Appreciation (Depreciation)     564      
Ending Fair Value       6,380    
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) Common Units            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArcserveCaymanGpLlcMember        
Investment type   whfcl:CommonUnitsMember        
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        
Investment type   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   $ 677        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArcserveCaymanOpcoLpMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Dividends, interest and PIK included in income   $ 116        
Gross Additions   677        
Net Change in Unrealized Appreciation (Depreciation)   570        
Ending Fair Value   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   $ 569        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArcserveCaymanOpcoLpMember        
Investment type   whfcl:UnsecuredLoanMember        
Dividends, interest and PIK included in income   $ 54        
Gross Additions   569        
Net Change in Unrealized Appreciation (Depreciation)   12        
Ending Fair Value   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   $ 583        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArcserveCaymanOpcoLpMember        
Investment type   whfcl:UnsecuredLoanMember        
Dividends, interest and PIK included in income   $ 55        
Gross Additions   583        
Net Change in Unrealized Appreciation (Depreciation)   11        
Ending Fair Value   594        
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 19,568        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArcserveCaymanTopcoLpMember        
Investment type   whfcl:CommonUnitsMember        
Ending Fair Value   $ 9,131        
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units Two            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArcserveCaymanTopcoLpMember        
Investment type   whfcl:CommonUnitsMember        
Gross Additions   $ 19,568        
Net Change in Unrealized Appreciation (Depreciation)   (10,437)        
Ending Fair Value   9,131        
Investment, Identifier [Axis]: Arcstor Midco, LLC (d/b/a Arcserve (USA), LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 19,568      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ArcstorMidcoLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   10,477        
Ending Fair Value     $ 10,477      
Investment, Identifier [Axis]: Arcstor Midco, LLC (d/b/a Arcserve (USA), LLC Priority First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 1,050      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ArcstorMidcoLLCMember      
Investment type     whfcl:PriorityFirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   $ 1,046        
Ending Fair Value     $ 1,046      
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      
Ending Fair Value   $ 9        
Investment, Identifier [Axis]: Arteriocyte Medical Systems, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,877 $ 4,901      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ArteriocyteMedicalSystemsInc.Member whfcl:ArteriocyteMedicalSystemsInc.Member      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 4,901        
Ending Fair Value   5,021 $ 4,901      
Investment, Identifier [Axis]: Atlas Purchaser, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 2,675      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:AtlasPurchaserIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   2,269        
Ending Fair Value     $ 2,269      
Investment, Identifier [Axis]: Atlas Purchaser, Inc Second Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 14,699      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:AtlasPurchaserIncMember      
Investment type     whfcl:SecondLienSecuredTermLoanMember      
Beginning Fair Value   9,744        
Ending Fair Value     $ 9,744      
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   $ 545        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Avision Holdings, LLC (d/b/a Avision Sales Group)        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Avision Holdings, LLC (d/b/a Avision Sales Group)        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 411        
Ending Fair Value   577 $ 411      
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 2,645 $ 2,606      
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   $ 2,613        
Ending Fair Value   2,642 $ 2,613      
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 12,972 $ 12,787      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:BBQBuyerLLCMember whfcl:BBQBuyerLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 12,818        
Ending Fair Value   12,955 $ 12,818      
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   $ 1,330        
Ending Fair Value   907 $ 1,330      
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 788 $ 788      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:BLProductsParentLPMember whfcl:BLProductsParentLPMember      
Investment type   whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember      
Beginning Fair Value   $ 1,053        
Ending Fair Value   1,012 $ 1,053      
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 942 $ 825      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:BPII-JLGroupHoldingsLPMember whfcl:BPII-JLGroupHoldingsLPMember      
Investment type   whfcl:ClassAUnitsMember whfcl:ClassAUnitsMember      
Beginning Fair Value   $ 983        
Ending Fair Value   1,400 $ 983      
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   $ 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.)        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 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   $ 7,580        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 7,691        
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc) First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 137      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:BannerIndustriesIncMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   137        
Ending Fair Value     $ 137      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,472 $ 1,366      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.) Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)      
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   $ 1,365        
Ending Fair Value   1,477 $ 1,365      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 412 $ 191      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.) Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)      
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 191        
Ending Fair Value   415 $ 191      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 2,974 $ 3,015      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.) Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 3,015        
Ending Fair Value   $ 2,981 $ 3,015      
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) First Lien Secured Delayed Draw Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)      
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember      
Ending Fair Value   $ (2)        
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 58        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)      
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Ending Fair Value   $ 63        
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,543 $ 3,564      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 3,564        
Ending Fair Value   $ 3,574 $ 3,564      
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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   $ 3,633        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:BaselU.s.AcquisitionCo.Inc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 3,675        
Investment, Identifier [Axis]: Branford Filtration, LLC (d/b/a Clean Solutions Group) First Lien Secured Revolving Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     Branford Filtration, LLC (d/b/a Clean Solutions Group)      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: Branford Filtration, LLC (d/b/a Clean Solutions Group) First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 11,358      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     Branford Filtration, LLC (d/b/a Clean Solutions Group)      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   11,358        
Ending Fair Value     $ 11,358      
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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   $ (1)        
Ending Fair Value   231 $ (1)      
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 8,457 $ 8,973      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:BridgepointHealthcareLLCMember whfcl:BridgepointHealthcareLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 8,967        
Ending Fair Value   8,429 $ 8,967      
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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   $ (3)        
Ending Fair Value   2,183 $ (3)      
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 230 $ 176      
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   $ 181        
Ending Fair Value   248 $ 181      
Investment, Identifier [Axis]: Buckeye Acquiror LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,774 $ 5,845      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:BuckeyeAcquirorLlcMember whfcl:BuckeyeAcquirorLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 5,898        
Ending Fair Value   6,952 $ 5,898      
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 1,989      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:BulkMidcoLLCMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   1,972        
Ending Fair Value     $ 1,972      
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 19,237      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:BulkMidcoLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   18,997        
Ending Fair Value     $ 18,997      
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   $ 1,715        
Ending Fair Value   2,232 $ 1,715      
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 10,269        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CamarilloFitnessHoldingsLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Dividends, interest and PIK included in income   $ 36        
Gross Additions   10,270        
Net Change in Unrealized Appreciation (Depreciation)   222        
Ending Fair Value   10,492        
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 10,325 $ 11,517      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CampFacilityServicesHoldingsLLCMember whfcl:CampFacilityServicesHoldingsLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 11,496        
Ending Fair Value   9,905 $ 11,496      
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   Preferred Units [Member] Preferred Units [Member]      
Beginning Fair Value   $ 1,023        
Ending Fair Value   $ 162 $ 1,023      
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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 2        
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 665        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CennoxHoldingsLimitedMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 643        
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 1,182      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:CennoxHoldingsLimitedMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   1,082        
Ending Fair Value     $ 1,082      
Investment, Identifier [Axis]: Cennox Holdings Limited., First lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 3,863      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:CennoxHoldingsLimitedMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   3,538        
Ending Fair Value     $ 3,538      
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 29        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CennoxInc.Member        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 30        
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Term Loan One            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 649        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CennoxInc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 611        
Investment, Identifier [Axis]: Cennox, Inc, First lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 9,851      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:CennoxInc.Member      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   10,257        
Ending Fair Value     $ 10,257      
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,319        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CennoxInc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 3,342 $ 2,962      
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   $ 380 $ 270      
Beginning Fair Value   2,793        
Gross Additions   380 2,961      
Net Change in Unrealized Appreciation (Depreciation)   169 (168)      
Ending Fair Value   3,342 2,793      
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 $ 628      
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   $ 496        
Ending Fair Value   555 $ 496      
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,690 $ 7,395      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ClaridgeProductsandEquipmentLLCMember whfcl:ClaridgeProductsandEquipmentLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 6,405        
Ending Fair Value   5,085 $ 6,405      
Investment, Identifier [Axis]: Clark Restaurant Service, LLC, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,919        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ClarkRestaurantServiceLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 4,993        
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 15,802 $ 15,715      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CleanChoiceEnergyIncMember whfcl:CleanChoiceEnergyIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 15,954        
Ending Fair Value   $ 16,032 $ 15,954      
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   $ (3)        
Ending Fair Value   1 $ (3)      
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 7,808 $ 7,329      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:CoastalTelevisionBroadcastingGroupLLCMember whfcl:CoastalTelevisionBroadcastingGroupLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 7,246        
Ending Fair Value   7,832 $ 7,246      
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 13,541      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:DrewFoamCompaniesIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   13,313        
Ending Fair Value     $ 13,313      
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 13,445        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:DrewFoamCompaniesIncMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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     $ 8,541      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:E-PhoenixAcquisitionCo.Inc.Member      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   8,562        
Ending Fair Value     $ 8,562      
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc., First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 8,299        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:E-PhoenixAcquisitionCo.Inc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 8,342        
Investment, Identifier [Axis]: Eddy Acquisitions, LLC 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:EddyAcquisitionsLLCMember whfcl:EddyAcquisitionsLLCMember      
Investment type   Preferred Units [Member] Preferred Units [Member]      
Beginning Fair Value   $ 18        
Ending Fair Value     $ 18      
Investment, Identifier [Axis]: Education Dynamics, LLC Senior 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:EducationDynamicsLLCMember        
Investment type   whfcl:SeniorPreferredUnitsMember        
Ending Fair Value   $ 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   $ (22)        
Ending Fair Value   (51) $ (22)      
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 12,989 $ 12,647      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:EducationDynamicsLLCMember whfcl:EducationDynamicsLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 12,407        
Ending Fair Value   12,449 $ 12,407      
Investment, Identifier [Axis]: EducationDynamics, LLC Subordinated Unsecured Term Loa            
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:EducationDynamicsLLCMember      
Investment type     whfcl:SubordinatedUnsecuredTermLoanMember      
Beginning Fair Value   167        
Ending Fair Value     $ 167      
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 4,545      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:EmpireOfficeIncMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   4,556        
Ending Fair Value     $ 4,556      
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 10,931      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:EmpireOfficeIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   10,947        
Ending Fair Value     $ 10,947      
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   $ 6,857        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:EventServicesAmericaIncMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 15,765 $ 15,786      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:FgiAcquisitionCorpMember whfcl:FgiAcquisitionCorpMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 16,110        
Ending Fair Value   $ 16,026 $ 16,110      
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,280        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:FloworksInternationalLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 200        
Ending Fair Value   321 $ 200      
Investment, Identifier [Axis]: Foodservices Brand Group, LLC Second Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 4,915      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:FoodservicesBrandGroupLlcMember      
Investment type     whfcl:SecondLienSecuredTermLoanMember      
Beginning Fair Value   1,601        
Ending Fair Value     $ 1,601      
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,000 $ 3,018      
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   $ 3,025        
Ending Fair Value   $ 3,023 $ 3,025      
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   $ 1        
Ending Fair Value   5 $ 1      
Investment, Identifier [Axis]: Forward Solutions, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 8,937 $ 8,991      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ForwardSolutionsLlcMember whfcl:ForwardSolutionsLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,014        
Ending Fair Value   9,007 $ 9,014      
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 20,382 $ 21,582      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:FuturePaymentTechnologiesLPMember whfcl:FuturePaymentTechnologiesLPMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 21,480        
Ending Fair Value   $ 20,420 $ 21,480      
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   $ 5        
Ending Fair Value   2 $ 5      
Investment, Identifier [Axis]: Geo Logic Systems Ltd First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 14,234 $ 14,969      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:GeoLogicSystemsLtdMember whfcl:GeoLogicSystemsLtdMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 14,654        
Ending Fair Value   12,883 $ 14,654      
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   $ 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   $ 7        
Ending Fair Value   447 $ 7      
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   $ 8,811 $ 4,685      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:GulfWindsInternationalAcquisitionLlcMember whfcl:GulfWindsInternationalAcquisitionLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 4,738        
Ending Fair Value   $ 8,857 $ 4,738      
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        
Investment type   whfcl:LimitedPartnerInterestsMember        
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Revolving Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:HCSalonHoldingsIncMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 8        
Ending Fair Value     $ 8      
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 11,279      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:HCSalonHoldingsIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   11,404        
Ending Fair Value     $ 11,404      
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,384 $ 2,369      
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   $ 2,282        
Ending Fair Value   1,354 $ 2,282      
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 480 $ 589      
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   $ 547        
Ending Fair Value   455 $ 547      
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,523 $ 9,448      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:HRGManagementLLCMember whfcl:HRGManagementLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,074        
Ending Fair Value   5,395 $ 9,074      
Investment, Identifier [Axis]: Hollander Intermediate LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 4,661      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:HollanderIntermediateLlcMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   4,179        
Ending Fair Value     $ 4,179      
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 4,631      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     Honors Holdings, LLC      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   4,603        
Ending Fair Value     $ 4,603      
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 9,375      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     Honors Holdings, LLC      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,347        
Ending Fair Value     $ 9,347      
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      
Ending Fair Value   $ 4        
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,286 $ 3,503      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ITSBuyerIncMember whfcl:ITSBuyerIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 3,504        
Ending Fair Value   3,307 $ 3,504      
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 10 $ 7      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ImageOneIndustriesLLCMember whfcl:ImageOneIndustriesLLCMember      
Investment type   whfcl:CommonUnitsMember whfcl:CommonAUnitsMember      
Beginning Fair Value   $ 9        
Ending Fair Value   12 $ 9      
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 11,626      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:IndustrialSpecialtyServicesUSALLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   11,537        
Ending Fair Value     $ 11,537      
Investment, Identifier [Axis]: JVMC Holdings Corp First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 3,521      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:JVMCHoldingsCorpMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   3,522        
Ending Fair Value     $ 3,522      
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 2,326 $ 2,341      
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   $ 2,342        
Ending Fair Value   2,343 $ 2,342      
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 513 $ 197      
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   $ 193        
Ending Fair Value   522 $ 193      
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 11,000 $ 11,073      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:JuniperLandscapingHoldingsLLCMember whfcl:JuniperLandscapingHoldingsLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 11,080        
Ending Fair Value   $ 11,078 $ 11,080      
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      
Ending Fair Value   $ 9        
Investment, Identifier [Axis]: KORE Wireless Group Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,256 $ 6,294      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:KoreWirelessGroupIncMember whfcl:KoreWirelessGroupIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 6,295        
Ending Fair Value   $ 6,323 $ 6,295      
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Investment, Identifier [Axis]: Kelso Industries LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,539        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Kelso Industries LLC        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 683        
Ending Fair Value   779 $ 683      
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      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   (1)        
Ending Fair Value     $ (1)      
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 8,454      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:LINCSystemsLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 8,443        
Ending Fair Value     $ 8,443      
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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 3        
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 8,114        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:LINCSystemsLLCMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 8,155        
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 13,203      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:LMGHoldingsIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   13,265        
Ending Fair Value     $ 13,265      
Investment, Identifier [Axis]: LMG Holdings, Inc. First Lien Secured Revolving Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:LMGHoldingsIncMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   4        
Ending Fair Value     $ 4      
Investment, Identifier [Axis]: LSCS Holdings, Inc Second Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,953 $ 4,944      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:LSCSHoldingsIncMember whfcl:LSCSHoldingsIncMember      
Investment type   whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember      
Beginning Fair Value   $ 4,901        
Ending Fair Value   5,000 $ 4,901      
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,020 $ 5,089      
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   $ 5,090        
Ending Fair Value   5,020 $ 5,090      
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 437        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:LabLogisticsLLCMember        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 437        
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,381 $ 5,442      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:LabLogisticsLLCMember whfcl:LabLogisticsLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 5,449        
Ending Fair Value   $ 5,383 $ 5,449      
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Revolving Loan            
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   $ 14        
Ending Fair Value   10 $ 14      
Investment, Identifier [Axis]: Leviathan Intermediate Holdco, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 12,981 $ 10,098      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:LeviathanIntermediateHoldcoLlcMember whfcl:LeviathanIntermediateHoldcoLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 10,346        
Ending Fair Value   13,312 $ 10,346      
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,453 $ 5,492      
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   $ 5,457        
Ending Fair Value   5,461 $ 5,457      
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,592 $ 1,441      
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   $ 1,406        
Ending Fair Value   $ 1,594 $ 1,406      
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 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   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 6,144        
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,556 $ 5,233      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:LuxuryBrandHoldingsIncMember whfcl:LuxuryBrandHoldingsIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 5,280        
Ending Fair Value   4,580 $ 5,280      
Investment, Identifier [Axis]: M2S Group Intermediate Holdings, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 9,119        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:M2sGroupIntermediateHoldingsIncMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 9,453        
Investment, Identifier [Axis]: MBS Highway, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 9,157 $ 9,204      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MbsHighwayLlcMember whfcl:MbsHighwayLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,089        
Ending Fair Value   9,212 $ 9,089      
Investment, Identifier [Axis]: MGT Merger Target, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 804 $ 378      
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   $ 389        
Ending Fair Value   817 $ 389      
Investment, Identifier [Axis]: MGT Merger Target, LLC First lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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   $ 11        
Ending Fair Value   249 $ 11      
Investment, Identifier [Axis]: MGT Merger Target, LLC First lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 7,040 $ 6,084      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MgtMergerTargetLlcMember whfcl:MgtMergerTargetLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 6,194        
Ending Fair Value   7,176 $ 6,194      
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 815      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MSIInformationServicesIncMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   776        
Ending Fair Value     $ 776      
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 7,248      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MSIInformationServicesIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   6,972        
Ending Fair Value     $ 6,972      
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,043        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MSIInformationServicesIncMember        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 945        
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 8,552        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MSIInformationServicesIncMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ (1)        
Ending Fair Value   5 $ (1)      
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   $ 4,823 $ 4,602      
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   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 4,580        
Ending Fair Value   4,922 $ 4,580      
Investment, Identifier [Axis]: Manchester Acquisition Sub LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 7,587      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ManchesterAcquisitionSubLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 7,215        
Ending Fair Value     $ 7,215      
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   $ (3)        
Ending Fair Value   (38) $ (3)      
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 18,798      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MarlinDTC-LSMidco2LLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   18,762        
Ending Fair Value     $ 18,762      
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   $ 18,577        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MarlinDTC-LSMidco2LLCMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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      
Beginning Fair Value   $ 179        
Ending Fair Value     $ 179      
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MaxSolutionsIncMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   (17)        
Ending Fair Value     $ (17)      
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      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 6,485      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MaxSolutionsIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   6,488        
Ending Fair Value     $ 6,488      
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 411        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MaxSolutionsIncMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ (3)        
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,439        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MaxSolutionsIncMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 6,324        
Investment, Identifier [Axis]: Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC) First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 938        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MaxorAcquisitionInc.Member        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 938        
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   9 $ 9      
Investment, Identifier [Axis]: Maxor Acquisition, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,898 $ 4,922      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MaxorAcquisitionInc.Member whfcl:MaxorAcquisitionInc.Member      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 5,013        
Ending Fair Value   $ 4,986 $ 5,013      
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 whfcl:MedicalDeviceIncMember      
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 3        
Ending Fair Value   6 $ 3      
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 2,584 $ 2,599      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MedicalDeviceIncMember whfcl:MedicalDeviceIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 2,626        
Ending Fair Value   2,660 $ 2,626      
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   $ 295        
Ending Fair Value   368 $ 295      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 871      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MetaBuyerLLCMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   883        
Ending Fair Value     $ 883      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 1,141      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MetaBuyerLLCMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   1,161        
Ending Fair Value     $ 1,161      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan One            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 13,552      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MetaBuyerLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   13,401        
Ending Fair Value     $ 13,401      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 959      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:MetaBuyerLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   971        
Ending Fair Value     $ 971      
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 865        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MetaBuyerLLCMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 874        
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 13,449        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MetaBuyerLLCMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 12,465        
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Term Loan One            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 952        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MetaBuyerLLCMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 962        
Investment, Identifier [Axis]: Meta Buyer LLC.,First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,145        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MetaBuyerLLCMember        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 1,160        
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Bridge Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 1,420      
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)      
Investment type     whfcl:FirstLienSecuredBridgeLoanMember      
Beginning Fair Value   1,420        
Ending Fair Value     $ 1,420      
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        
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      
Ending Fair Value   $ 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   $ 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      
Ending Fair Value   $ 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   $ 9,255 $ 9,254      
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   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,254        
Ending Fair Value   9,399 $ 9,254      
Investment, Identifier [Axis]: Monarch Collective Holdings, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,572        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MonarchCollectiveHoldingsLlcMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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   $ 9,119        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MonarchCollectiveHoldingsLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 1,175 $ 468      
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   $ 338        
Ending Fair Value   1,061 $ 338      
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 10,449 $ 9,888      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:MotivationalMarketingLLCMember whfcl:MotivationalMarketingLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 8,790        
Ending Fair Value   9,438 $ 8,790      
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 9,087 $ 9,354      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:NNAServicesLLCMember whfcl:NNAServicesLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,293        
Ending Fair Value   8,941 $ 9,293      
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 719 $ 716      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:NPAVLessorCorp.Member whfcl:NPAVLessorCorp.Member      
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 647        
Ending Fair Value   660 $ 647      
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,448 $ 7,418      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:NPAVLessorCorp.Member whfcl:NPAVLessorCorp.Member      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 6,706        
Ending Fair Value   5,918 $ 6,706      
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 301 $ 271      
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   $ 268        
Ending Fair Value   169 $ 268      
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,140 $ 3,148      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:NavigaIncMember whfcl:NavigaIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 3,113        
Ending Fair Value   $ 1,763 $ 3,113      
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:NewAmericanCraftsHoldingsLlcClassaUnitsMember      
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   $ 27        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   PANOS Brands, LLC        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 33        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan, One 05/14/29            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 30        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   PANOS Brands, LLC        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 36        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,441        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   PANOS Brands, LLC        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 4,505        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan, One 05/14/29            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,997        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   PANOS Brands, LLC        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 4,054        
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 423      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PfbHoldingCompanyLlcMember      
Investment type     whfcl:ClassAUnitsMember      
Beginning Fair Value   1,053        
Ending Fair Value     $ 1,053      
Investment, Identifier [Axis]: PFB Holding Company, LLC Class A Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 24        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PFBHoldcoIncMember        
Investment type   whfcl:ClassAUnitsMember        
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 698      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PGDentalNewJerseyParentLLCMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 704        
Ending Fair Value     $ 704      
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 6,348      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PGDentalNewJerseyParentLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   6,400        
Ending Fair Value     $ 6,400      
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        
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   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 8,188        
Investment, Identifier [Axis]: Patagonia Holdco LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 12,602 $ 12,357      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PatagoniaHoldcoLLCMember whfcl:PatagoniaHoldcoLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 13,191        
Ending Fair Value   13,135 $ 13,191      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 558 $ 560      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember      
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   $ 569        
Ending Fair Value   569 $ 569      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 331        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember      
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 5        
Ending Fair Value   341 $ 5      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,015 $ 4,344      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 4,405        
Ending Fair Value   5,111 $ 4,405      
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 6,498      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PennsylvaniaMachineWorksLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 6,561        
Ending Fair Value     $ 6,561      
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      
Ending Fair Value   $ 17        
Investment, Identifier [Axis]: Pirtek Holdco, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 7,298 $ 7,337      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PirtekHoldcoLLCMember whfcl:PirtekHoldcoLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 7,337        
Ending Fair Value   7,425 $ 7,337      
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PlaymonsterGroupLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Dividends, interest and PIK included in income     $ 85      
Beginning Fair Value   1,363 2,977      
Net Change in Unrealized Appreciation (Depreciation)     (1,614)      
Ending Fair Value     1,363 2,977    
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 460 $ 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 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:PlayMonsterLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 1,363        
Net Change in Unrealized Appreciation (Depreciation)   272        
Ending Fair Value   1,635 $ 1,363      
Investment, Identifier [Axis]: Playmonster Group LLC, Priority First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,275 $ 1,118      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PlaymonsterGroupLLCMember whfcl:PlayMonsterLLCMember      
Investment type   whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember      
Dividends, interest and PIK included in income   $ 157 $ 129      
Beginning Fair Value   1,015 176      
Gross Additions   157 943      
Net Change in Unrealized Appreciation (Depreciation)     (104)      
Ending Fair Value   1,172 1,015 176    
Investment, Identifier [Axis]: Potpourri Group, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 13,767      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PotpourriGroupIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   13,799        
Ending Fair Value     $ 13,799      
Investment, Identifier [Axis]: Poultry Holdings LLC., First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 6,904      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:PoultryHoldingsLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   6,904        
Ending Fair Value     $ 6,904      
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   $ 1,329 $ 1,336      
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   $ 1,353        
Ending Fair Value   1,354 $ 1,353      
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   $ 8,642 $ 8,712      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PowerServiceGroupCrAcquisitionIncMember whfcl:PowerServiceGroupCrAcquisitionIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 8,782        
Ending Fair Value   $ 8,784 $ 8,782      
Investment, Identifier [Axis]: Pressurized Holdings, LLC Common Units            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Pressurized Holdings, LLC [Member] Pressurized Holdings, LLC [Member]      
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   Pressurized Holdings, LLC [Member] Pressurized Holdings, LLC [Member]      
Investment type   Preferred Units [Member] Preferred Units [Member]      
Beginning Fair Value   $ 251        
Gross Additions     $ 4,537      
Net Change in Unrealized Appreciation (Depreciation)   1,406 (4,286)      
Ending Fair Value   $ 1,657 251      
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   $ 3,479        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:PrincipalLightingGroupLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 3,479        
Investment, Identifier [Axis]: Project Castle, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 5,536      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:ProjectCastleIncMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   5,364        
Ending Fair Value     $ 5,364      
Investment, Identifier [Axis]: Quest Events LLC, First Lien Secured Term Loan, 09/30/26            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 11,563        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:QuestEventsLLCMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 11,592        
Investment, Identifier [Axis]: Quest Events, LLC Common Units            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 376 $ 360      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember      
Investment type   whfcl:CommonUnitsMember whfcl:CommonUnitsMember      
Beginning Fair Value   $ 305        
Ending Fair Value   149 $ 305      
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 246 $ 246      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember      
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   $ 242        
Ending Fair Value   248 $ 242      
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 472 $ 11,663      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 11,557        
Ending Fair Value   473 $ 11,557      
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 2,922 $ 2,945      
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   $ 2,965        
Ending Fair Value   2,946 $ 2,965      
Investment, Identifier [Axis]: RCKC Acquisitions LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 10,839 $ 10,925      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:RCKCAcquisitionsLLCMember whfcl:RCKCAcquisitionsLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 10,993        
Ending Fair Value   $ 10,923 $ 10,993      
Investment, Identifier [Axis]: RCKC Acquisitions LLC, First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 106      
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   $ 114        
Ending Fair Value   11 $ 114      
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,566        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:RLJPro-VacInc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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.)        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 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   $ 8,600        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   Preferred Units [Member] Preferred Units [Member]      
Beginning Fair Value   $ 832        
Ending Fair Value   756 $ 832      
Investment, Identifier [Axis]: SFS Global Holding Company Warrants            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SFSGlobalHoldingCompanyMember      
Investment type     Warrant      
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,641        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SalonRepublicHoldingsLlcMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 1,672        
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Revolving Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SalonRepublicHoldingsLlcMember        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 13        
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 4,988        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SalonRepublicHoldingsLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 5,063        
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 729      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SalonRepublicHoldingsLlcMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   745        
Ending Fair Value     $ 745      
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 245      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SalonRepublicHoldingsLlcMember      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   258        
Ending Fair Value     $ 258      
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 5,001      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SalonRepublicHoldingsLlcMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   5,077        
Ending Fair Value     $ 5,077      
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      
Beginning Fair Value   241        
Ending Fair Value     $ 241      
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      
Beginning Fair Value   218        
Ending Fair Value     $ 218      
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   $ 132        
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   $ 242        
Investment, Identifier [Axis]: Sigue Corporation Warrants            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 2,890      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SigueCorporationMember      
Investment type     Warrant      
Beginning Fair Value   $ 3,472        
Ending Fair Value     $ 3,472      
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   $ 3        
Ending Fair Value   5 $ 3      
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 22,401 $ 20,385      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SleepOpCoLLCMember whfcl:SleepOpCoLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 20,407        
Ending Fair Value   22,441 $ 20,407      
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,682        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SmaltoInc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 6,654        
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan Interest Rate 10.18            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 6,821      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SmaltoInc.Member      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   7,172        
Ending Fair Value     $ 7,172      
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan Interest Rate 11.50            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 987      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SmaltoInc.Member      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   996        
Ending Fair Value     $ 996      
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 967        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SmaltoInc.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 978        
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   $ 130        
Ending Fair Value   173 $ 130      
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,819 $ 1,654      
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   $ 1,623        
Ending Fair Value   1,790 $ 1,623      
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   $ 53        
Ending Fair Value   70 $ 53      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 2,759      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SolarHoldingsBidcoLimitedMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   2,892        
Ending Fair Value     $ 2,892      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SOFR            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 2,744      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SolarHoldingsBidcoLimitedMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   2,786        
Ending Fair Value     $ 2,786      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 205      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SolarHoldingsBidcoLimitedMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   217        
Ending Fair Value     $ 217      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan CDOR            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 324      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SolarHoldingsBidcoLimitedMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   342        
Ending Fair Value     $ 342      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan SOFR            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 360      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SolarHoldingsBidcoLimitedMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   366        
Ending Fair Value     $ 366      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan SONIA            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 882      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SolarHoldingsBidcoLimitedMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   984        
Ending Fair Value     $ 984      
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 4,039      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SourceCodeHoldingsLLCMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   4,047        
Ending Fair Value     $ 4,047      
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 14,772      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SourceCodeHoldingsLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   14,806        
Ending Fair Value     $ 14,806      
Investment, Identifier [Axis]: Source Code Holdings, LLC., First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 3,839        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SourceCodeHoldingsLLCMember        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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   $ 14,041        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:SourceCodeHoldingsLLCMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 404        
Ending Fair Value   388 $ 404      
Investment, Identifier [Axis]: StoicLane MidCo, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 5,466      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:StoiclaneMidcoLlcMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   5,633        
Ending Fair Value     $ 5,633      
Investment, Identifier [Axis]: StoicLane MidCo, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 4,518      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:StoiclaneMidcoLlcMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   4,606        
Ending Fair Value     $ 4,606      
Investment, Identifier [Axis]: Sunless, Inc. First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 485      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SunlessInc.Member      
Investment type     whfcl:FirstLienSecuredRevolvingLoanMember      
Beginning Fair Value   484        
Ending Fair Value     $ 484      
Investment, Identifier [Axis]: Sunless, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 5,459      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:SunlessInc.Member      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   5,473        
Ending Fair Value     $ 5,473      
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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.)        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 577        
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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.)        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 576        
Investment, Identifier [Axis]: Surge Amuze Holdings Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,629        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 5,643        
Investment, Identifier [Axis]: TOT Group, Inc. (d/b/a Netevia Group LLC) First Lien Secured Delayed Draw Loan            
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   TOT Group, Inc. (d/b/a Netevia Group LLC)        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ (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)        
Investment type   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   $ 8,074        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   TOT Group, Inc. (d/b/a Netevia Group LLC)        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 8,067        
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 2,315      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:TOURIntermediateHoldingsLLCMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   2,320        
Ending Fair Value     $ 2,320      
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 2,643      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:TOURIntermediateHoldingsLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   2,657        
Ending Fair Value     $ 2,657      
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 2,468        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TabletrustBrandsLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 2,468        
Investment, Identifier [Axis]: Team Car Care Holdings, First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 12,391      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:TeamCarCareHoldingsLLCMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   12,407        
Ending Fair Value     $ 12,407      
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 1,051 $ 1,228      
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   $ 1,223        
Ending Fair Value   1,009 $ 1,223      
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 17,496 $ 15,580      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Telestream Holdings Corporation Telestream Holdings Corporation      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 15,522        
Ending Fair Value   17,063 $ 15,522      
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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   $ (31)        
Ending Fair Value   761 $ (31)      
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 11,309 $ 11,282      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TheKyjenCompanyLLCMember whfcl:TheKyjenCompanyLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 10,904        
Ending Fair Value   10,895 $ 10,904      
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,709 $ 6,695      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TokenBuyerIncMember whfcl:TokenBuyerIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 5,966        
Ending Fair Value   $ 5,658 $ 5,966      
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Investment, Identifier [Axis]: Trailhead Media LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 6,548        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   Trailhead Media LLC        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 8,481 $ 8,648      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TranserviceHoldingsIncMember whfcl:TranserviceHoldingsIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 8,743        
Ending Fair Value   8,715 $ 8,743      
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 15,006 $ 15,472      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TrimliteBuyerLLCMember whfcl:TrimliteBuyerLLCMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 14,810        
Ending Fair Value   $ 13,206 $ 14,810      
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 12        
Investment, Identifier [Axis]: TriplePoint Acquisition Holdings LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,254        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TriplepointAcquisitionHoldingsLlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 5,338        
Investment, Identifier [Axis]: Turnberry Solutions., 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   $ 2        
Ending Fair Value   4 $ 2      
Investment, Identifier [Axis]: Turnberry Solutions., First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 5,924 $ 5,962      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TurnberrySolutionsInc.Member whfcl:TurnberrySolutionsInc.Member      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 5,979        
Ending Fair Value   5,964 $ 5,979      
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        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:TwinRidgeCrsLpMember        
Investment type   whfcl:ClassCommonUnitsMember        
Ending Fair Value   $ 350        
Investment, Identifier [Axis]: US Methanol Midco LLC (d/b/a US Methanol LLC) First Lien Secured Delayed Draw Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 9,345      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:UsMethanolMidcoLlcMember      
Investment type     whfcl:FirstLienSecuredDelayedDrawLoanMember      
Beginning Fair Value   9,449        
Ending Fair Value     $ 9,449      
Investment, Identifier [Axis]: US Methanol Midco LLC (d/b/a US Methanol LLC) First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment     $ 5,111      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name     whfcl:UsMethanolMidcoLlcMember      
Investment type     First Lien Secured Term Loan [Member]      
Beginning Fair Value   5,153        
Ending Fair Value     $ 5,153      
Investment, Identifier [Axis]: UserZoom Technologies, Inc. First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 9,618 $ 9,570      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:UserzoomTechnologiesIncMember whfcl:UserzoomTechnologiesIncMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 9,719        
Ending Fair Value   9,809 $ 9,719      
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:SeriesUnitsMember whfcl:ClassAUnitsMember      
Beginning Fair Value   $ 406        
Ending Fair Value   $ 493 $ 406      
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC 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)        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 9        
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC First Lien Secured Term Loan            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment   $ 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)        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 12,216        
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   $ 6,861 $ 6,158      
Beginning Fair Value   22,782 20,160      
Gross Additions     1,104      
Net Change in Unrealized Appreciation (Depreciation)   (41) 1,518      
Ending Fair Value   22,741 22,782 20,160    
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   $ 22,782        
Ending Fair Value   22,741 $ 22,782      
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   $ 9,838 $ 9,488      
Beginning Fair Value   84,416 80,000      
Gross Additions     4,416      
Ending Fair Value   $ 84,416 84,416 80,000    
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        
Investment type   whfcl:FirstLienSecuredDelayedDrawLoanMember        
Ending Fair Value   $ 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        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 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   $ 7,548        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:WakefieldAndAssociatesIntermediateCo.LlcMember        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 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   $ 1,615        
Ending Fair Value   1,756 $ 1,615      
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   $ 2,887 $ 2,919      
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:WhitestoneHomeFurnishingsLlcMember whfcl:WhitestoneHomeFurnishingsLlcMember      
Investment type   First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]      
Beginning Fair Value   $ 2,919        
Ending Fair Value   $ 2,930 $ 2,919      
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        
Investment type   whfcl:FirstLienSecuredRevolvingLoanMember        
Ending Fair Value   $ 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   $ 13,789        
Schedule of investments in and advances to affiliated and controlled persons            
Issuer name   whfcl:ZephyrBuyerL.p.Member        
Investment type   First Lien Secured Term Loan [Member]        
Ending Fair Value   $ 14,166        
Sklar Holdings, Inc [Member] | First Lien Secured Term Loan [Member]            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment           $ 3,339
Paydown received under investments $ 690          
Pressurized Holdings, LLC [Member] | Preferred Units [Member]            
Investments in and Advances to Affiliates [Line Items]            
Cost of investment $ 3,892          
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   798 398      
Beginning Fair Value   5,422 9,533      
Gross Additions   32,204 8,441      
Gross Reductions     (6,605)      
Net Realized Gain (Loss)     (339)      
Net Change in Unrealized Appreciation (Depreciation)   (7,775) (5,608) (5,239)    
Ending Fair Value   29,851 5,422 9,533    
Controlled affiliate company investments            
Schedule of investments in and advances to affiliated and controlled persons            
Dividends, interest and PIK included in income   17,079 16,993      
Beginning Fair Value   112,948 100,160      
Gross Additions   3,795 21,278      
Net Change in Unrealized Appreciation (Depreciation)   (9,213) (8,490) (447)    
Ending Fair Value   $ 107,530 $ 112,948 $ 100,160    
v3.25.1
INVESTMENTS - WHF STRS Ohio Senior Loan Fund LLC (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Nov. 26, 2024
May 18, 2023
Jan. 13, 2023
USD ($)
Mar. 11, 2022
USD ($)
Jul. 15, 2021
Jul. 31, 2019
Dec. 31, 2024
USD ($)
company
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 28, 2023
USD ($)
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             $ 642,213 $ 696,168              
Cost of investment             695,240 740,021              
Increase in credit facility limit             (24) 509 $ 14            
Available             $ 173,507 138,488              
LIBOR | Minimum                              
Schedule of Investments [Line Items]                              
Term of interest           3 years 3 years                
LIBOR | Maximum                              
Schedule of Investments [Line Items]                              
Term of interest           6 years 6 years                
Subordinated Notes                              
Schedule of Investments [Line Items]                              
Investments, fair value             $ 1,175 167              
Cost of investment             1,152 167              
Equity (excluding STRS JV)                              
Schedule of Investments [Line Items]                              
Investments, fair value             45,587 39,461              
Cost of investment             $ 63,299 $ 46,400              
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%   65.71%   66.67%      
Investments, fair value             $ 309,077 $ 332,160              
Portfolio companies | company             38                
Largest single investment             $ 19,594 19,889              
Five largest investments             79,058 83,564              
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%                    
Available       168,750             $ 131,250        
Borrowings greater than       $ 175,000                      
Amortized Cost, credit facility             $ 144,081 $ 165,244              
Effective interest rate (as a percent)             6.40% 7.70%              
STRS JV | STRS JV Credit Facility | Minimum                              
Schedule of Investments [Line Items]                              
Variable interest rate (as a percent) 2.50%                            
STRS JV | STRS JV Credit Facility | Maximum                              
Schedule of Investments [Line Items]                              
Variable interest rate (as a percent) 2.25%                            
STRS JV | STRS JV Credit Facility | SOFR                              
Schedule of Investments [Line Items]                              
Variable interest rate (as a percent)   2.72%   2.50%     2.25% 2.72%              
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)                   34.29%   33.33%      
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)
shares in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2024
CAD ($)
shares
Dec. 31, 2023
CAD ($)
shares
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]          
Investment Owned, at Cost $ 695,240 $ 740,021      
Investment Owned, at Fair Value $ 642,213 $ 696,168      
Percent of net assets 224.40% 219.70% 224.40% 219.70%  
Total investments and money market funds amortized cost $ 708,489        
Total investments and money market funds fair value $ 655,462        
Total investments and money market funds percentage 229.00%   229.00%    
STRS JV          
Schedule of Investments [Line Items]          
Investment Owned, at Cost $ 296,752 $ 312,807      
Investments owned non-accrual status 0 0      
Investment Owned, at Fair Value $ 294,957 $ 312,217      
Fair Value As A Percentage of Member's Equity 852.30% 900.60%      
Percent of net assets 852.30% 900.60% 852.30% 900.60%  
Total investments and money market funds amortized cost $ 297,519        
Total investments and money market funds fair value $ 295,724        
Total investments and money market funds percentage 854.50%   854.50%    
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 5.25%   5.25%    
Investment Interest Rate 9.78%   9.78%    
Investment, Acquisition Date Sep. 19, 2024        
Investment Maturity Date Jul. 02, 2031   Jul. 02, 2031    
Investment Owned, Balance, Principal Amount $ 78        
Investment Owned, at Cost 78        
Investment Owned, at Fair Value $ 80        
Fair Value As A Percentage of Member's Equity 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        
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 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]    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 5.25%   5.25%    
Investment Interest Rate 9.78%   9.78%    
Investment, Acquisition Date Sep. 19, 2024        
Investment Maturity Date Jul. 02, 2031   Jul. 02, 2031    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 5.25%   5.25%    
Investment Interest Rate 9.79%   9.79%    
Investment, Acquisition Date Sep. 19, 2024        
Investment Maturity Date Jul. 02, 2031   Jul. 02, 2031    
Investment Owned, Balance, Principal Amount $ 7,962        
Investment Owned, at Cost 7,866        
Investment Owned, at Fair Value $ 7,919        
Fair Value As A Percentage of Member's Equity 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 7.50% 7.50% 7.50% 7.50%  
Investment Interest Rate 11.98% 13.01% 11.98% 13.01%  
Investment, Acquisition Date Feb. 23, 2022 Feb. 23, 2022      
Investment Maturity Date Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028 Feb. 23, 2028  
Investment Owned, Balance, Principal Amount $ 20,409 $ 20,409      
Investment Owned, at Cost 20,142 20,056      
Investment Owned, at Fair Value $ 19,535 $ 18,983      
Percent of net assets 6.80% 6.00% 6.80% 6.00%  
Investment, Identifier [Axis]: ALM Media, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ALMMediaLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Data Processing & Outsourced Services   Data Processing & Outsourced Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   11.50%   11.50%  
Investment, Acquisition Date   Nov. 25, 2019      
Investment Maturity Date   Nov. 25, 2024   Nov. 25, 2024  
Investment Owned, Balance, Principal Amount   $ 12,600      
Investment Owned, at Cost   12,555      
Investment Owned, at Fair Value   $ 12,517      
Percent of net assets   4.00%   4.00%  
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.40%   10.40%    
Investment, Acquisition Date Apr. 26, 2024        
Investment Maturity Date Apr. 16, 2030   Apr. 16, 2030    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.40%   10.40%    
Investment, Acquisition Date Apr. 26, 2024        
Investment Maturity Date Apr. 16, 2030   Apr. 16, 2030    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.40%   10.40%    
Investment, Acquisition Date Apr. 26, 2024        
Investment Maturity Date Apr. 16, 2030   Apr. 16, 2030    
Investment Owned, Balance, Principal Amount $ 4,080        
Investment Owned, at Cost 4,027        
Investment Owned, at Fair Value $ 4,070        
Fair Value As A Percentage of Member's Equity 11.80%        
Investment, Identifier [Axis]: ATSG, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ATSGIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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  
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   6.50%   6.50%  
Investment Interest Rate   12.04%   12.04%  
Investment, Acquisition Date   Mar. 27, 2023      
Investment Maturity Date   Nov. 12, 2026   Nov. 12, 2026  
Investment Owned, Balance, Principal Amount   $ 9,873      
Investment Owned, at Cost   9,678      
Investment Owned, at Fair Value   $ 9,771      
Fair Value As A Percentage of Member's Equity   28.20%      
Investment, Identifier [Axis]: ATSG, Inc. First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ATSGIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   12.04%   12.04%  
Investment, Acquisition Date   Nov. 12, 2021      
Investment Maturity Date   Nov. 12, 2026   Nov. 12, 2026  
Investment Owned, Balance, Principal Amount   $ 3,785      
Investment Owned, at Cost   3,741      
Investment Owned, at Fair Value   $ 3,745      
Percent of net assets   1.20%   1.20%  
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 7.50%   7.50%    
Investment Interest Rate 11.96%   11.96%    
Investment, Acquisition Date Mar. 20, 2024        
Investment Maturity Date May 08, 2028   May 08, 2028    
Investment Owned, Balance, Principal Amount $ 1,782        
Investment Owned, at Cost 1,615        
Investment Owned, at Fair Value $ 1,456        
Investment, Interest Rate, Paid in Kind 6.50%   6.50%    
Investment, Interest Rate, Paid in Cash 5.46%   5.46%    
Percent of net assets 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        
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 7.00%   7.00%    
Investment Interest Rate 11.46%   11.46%    
Investment, Acquisition Date Mar. 20, 2024        
Investment Maturity Date May 08, 2028   May 08, 2028    
Investment Owned, Balance, Principal Amount $ 2,400        
Investment Owned, at Cost 2,330        
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 7.00%   7.00%    
Investment Interest Rate 11.46%   11.46%    
Investment, Acquisition Date Mar. 20, 2024        
Investment Maturity Date May 08, 2028   May 08, 2028    
Investment Owned, Balance, Principal Amount $ 9,600        
Investment Owned, at Cost 9,318        
Investment Owned, at Fair Value $ 3,990        
Percent of net assets 1.40%   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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Application Software   Application Software    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 7.50%   7.50%    
Investment Interest Rate 11.96%   11.96%    
Investment, Acquisition Date Mar. 20, 2024        
Investment Maturity Date May 08, 2028   May 08, 2028    
Investment Owned, Balance, Principal Amount $ 1,178        
Investment Owned, at Cost 1,029        
Investment Owned, at Fair Value $ 451        
Investment, Interest Rate, Paid in Kind 5.50%   5.50%    
Investment, Interest Rate, Paid in Cash 6.46%   6.46%    
Percent of net assets 0.20%   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]  
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 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  
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, 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 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  
Investment Owned, Balance, Principal Amount $ 2,191 $ 1,903      
Investment Owned, at Cost $ 2,094 1,903      
Investment Owned, at Fair Value   $ 1,878      
Investment, Interest Rate, Paid in Kind 12.96% 13.96% 12.96% 13.96%  
Percent of net assets   0.60%   0.60%  
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  
Investment Owned, at Fair Value   $ 1,878      
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  
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, 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 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  
Investment Owned, Balance, Principal Amount $ 1,823 $ 1,585      
Investment Owned, at Cost $ 1,458 1,458      
Investment Owned, at Fair Value   $ 93      
Investment, Interest Rate, Paid in Kind 12.96% 13.96% 12.96% 13.96%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [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, 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 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  
Investment Owned, Balance, Principal Amount $ 10,859 $ 9,441      
Investment Owned, at Cost $ 8,720 8,720      
Investment Owned, at Fair Value   $ 553      
Investment, Interest Rate, Paid in Kind 12.96% 13.96% 12.96% 13.96%  
Percent of net assets   0.20%   0.20%  
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  
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, 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 8.50% 8.50% 8.50% 8.50%  
Investment, Acquisition Date Dec. 22, 2022 Dec. 22, 2022      
Investment Maturity Date May 28, 2026 May 28, 2026 May 28, 2026 May 28, 2026  
Investment Owned, Balance, Principal Amount $ 5,876 $ 5,105      
Investment Owned, at Cost $ 5,105 5,105      
Investment Owned, at Fair Value   $ 3,226      
Investment, Interest Rate, Paid in Kind 12.96% 13.96% 12.96% 13.96%  
Percent of net assets   1.00%   1.00%  
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        
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.50%   8.50%    
Investment, Acquisition Date May 02, 2024        
Investment Maturity Date May 28, 2026   May 28, 2026    
Investment Owned, Balance, Principal Amount $ 2,485        
Investment Owned, at Cost 2,374        
Investment Owned, at Fair Value $ 373        
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        
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.50%   8.50%    
Investment, Acquisition Date Jan. 31, 2024        
Investment Maturity Date May 28, 2026   May 28, 2026    
Investment Owned, Balance, Principal Amount $ 1,287        
Investment Owned, at Cost $ 1,230        
Investment, Interest Rate, Paid in Kind 12.96%   12.96%    
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        
Investment, Type [Extensible Enumeration] whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember   whfcl:SuperSeniorPriorityFirstLienSecuredTermLoanMember    
Investment, Identifier [Axis]: Arcole Holding Corporation          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcoleHoldingCorporationMember      
Investment, Identifier [Axis]: Arcole Holding Corporation, Equity          
Schedule of Investments [Line Items]          
Investment, Type [Extensible Enumeration]   Equity Investments   Equity Investments  
Investment Owned, at Fair Value         $ 6,380
Investment, Identifier [Axis]: Arcserve Cayman GP LLC (d/b/a Arcserve (USA), LLC) Common Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanGpLlcMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software    
Investment, Acquisition Date Jan. 03, 2024        
Investment Owned, Balance, Shares | shares 663   663    
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        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember    
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.00%   8.00%    
Investment, Acquisition Date Jan. 03, 2024        
Investment Maturity Date Jan. 04, 2027   Jan. 04, 2027    
Investment Owned, Balance, Principal Amount $ 689        
Investment Owned, at Cost 677        
Investment Owned, at Fair Value $ 1,247        
Investment, Interest Rate, Paid in Kind 12.67%   12.67%    
Percent of net assets 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        
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember   whfcl:UnsecuredLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software    
Investment Interest Rate 9.00%   9.00%    
Investment, Acquisition Date Jan. 03, 2024        
Investment Maturity Date Jul. 02, 2029   Jul. 02, 2029    
Investment Owned, Balance, Principal Amount $ 581        
Investment Owned, at Cost 569        
Investment Owned, at Fair Value $ 581        
Investment, Interest Rate, Paid in Kind 9.00%   9.00%    
Percent of net assets 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        
Investment, Type [Extensible Enumeration] whfcl:UnsecuredLoanMember   whfcl:UnsecuredLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software    
Investment Interest Rate 9.00%   9.00%    
Investment, Acquisition Date Jan. 03, 2024        
Investment Maturity Date Jul. 02, 2029   Jul. 02, 2029    
Investment Owned, Balance, Principal Amount $ 594        
Investment Owned, at Cost 583        
Investment Owned, at Fair Value $ 594        
Percent of net assets 0.20%   0.20%    
Investment, Identifier [Axis]: Arcserve Cayman Topco LP (d/b/a Arcserve (USA), LLC) Common Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:ArcserveCaymanTopcoLpMember        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Systems Software   Systems Software    
Investment, Acquisition Date Jan. 03, 2024        
Investment Owned, Balance, Shares | shares 663   663    
Investment Owned, at Cost $ 19,568        
Investment Owned, at Fair Value $ 9,131        
Percent of net assets 3.20%   3.20%    
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        
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember   whfcl:CommonUnitsMember    
Investment Owned, at Fair Value $ 9,131        
Investment, Identifier [Axis]: Arcstor Midco, LLC (d/b/a Arcserve (USA), LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcstorMidcoLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.75%   7.75%  
Investment, Acquisition Date   Mar. 16, 2021      
Investment Maturity Date   Mar. 16, 2027   Mar. 16, 2027  
Investment Owned, Balance, Principal Amount   $ 21,613      
Investment Owned, at Cost   19,568      
Investment Owned, at Fair Value   $ 10,477      
Investment, Interest Rate, Paid in Kind   13.21%   13.21%  
Percent of net assets   3.30%   3.30%  
Investment, Identifier [Axis]: Arcstor Midco, LLC (d/b/a Arcserve (USA), LLC Priority First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ArcstorMidcoLLCMember      
Investment, Type [Extensible Enumeration]   whfcl:PriorityFirstLienSecuredDelayedDrawLoanMember   whfcl:PriorityFirstLienSecuredDelayedDrawLoanMember  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Spread Above Index   8.00%   8.00%  
Investment, Acquisition Date   Jul. 14, 2023      
Investment Maturity Date   Mar. 16, 2027   Mar. 16, 2027  
Investment Owned, Balance, Principal Amount   $ 1,078      
Investment Owned, at Cost   1,050      
Investment Owned, at Fair Value   $ 1,046      
Investment, Interest Rate, Paid in Kind   13.46%   13.46%  
Percent of net assets   0.30%   0.30%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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% 6.25% 5.00% 6.25%  
Investment Interest Rate 9.33% 11.60% 9.33% 11.60%  
Investment, Acquisition Date Oct. 25, 2023 Oct. 25, 2023      
Investment Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028  
Investment Owned, at Fair Value $ 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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% 6.25% 5.00% 6.25%  
Investment Interest Rate 9.33% 11.60% 9.33% 11.60%  
Investment, Acquisition Date Oct. 25, 2023 Oct. 25, 2023      
Investment Maturity Date Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028 Oct. 18, 2028  
Investment Owned, Balance, Principal Amount $ 4,972 $ 5,022      
Investment Owned, at Cost 4,877 4,901      
Investment Owned, at Fair Value $ 5,021 $ 4,901      
Fair Value As A Percentage of Member's Equity 14.50% 14.10%      
Investment, Identifier [Axis]: Atlas Purchaser, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:AtlasPurchaserIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Application Software   Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   0.75%   0.75%  
Spread Above Index   5.25%   5.25%  
Investment Interest Rate   10.88%   10.88%  
Investment, Acquisition Date   Aug. 29, 2022      
Investment Maturity Date   May 08, 2028   May 08, 2028  
Investment Owned, Balance, Principal Amount   $ 3,066      
Investment Owned, at Cost   2,675      
Investment Owned, at Fair Value   $ 2,269      
Percent of net assets   0.70%   0.70%  
Investment, Identifier [Axis]: Atlas Purchaser, Inc Second Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:AtlasPurchaserIncMember      
Investment, Type [Extensible Enumeration]   whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Application Software   Application Software  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   0.75%   0.75%  
Spread Above Index   9.00%   9.00%  
Investment Interest Rate   14.64%   14.64%  
Investment, Acquisition Date   May 03, 2021      
Investment Maturity Date   May 07, 2029   May 07, 2029  
Investment Owned, Balance, Principal Amount   $ 15,000      
Investment Owned, at Cost   14,699      
Investment Owned, at Fair Value   $ 9,744      
Percent of net assets   3.10%   3.10%  
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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.48%   10.48%    
Investment, Acquisition Date May 31, 2024        
Investment Maturity Date Dec. 15, 2026   Dec. 15, 2026    
Investment Owned, Balance, Principal Amount $ 553        
Investment Owned, at Cost 545        
Investment Owned, at Fair Value $ 558        
Percent of net assets 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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.48%   10.48%    
Investment, Acquisition Date May 31, 2024        
Investment Maturity Date Dec. 15, 2026   Dec. 15, 2026    
Investment Owned, Balance, Principal Amount $ 658        
Investment Owned, at Cost 648        
Investment Owned, at Fair Value $ 652        
Percent of net assets 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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising  
Investment, Acquisition Date Dec. 15, 2021 Dec. 15, 2021      
Investment Owned, Balance, Shares | shares 200 200 200 200  
Investment Owned, at Cost $ 287 $ 287      
Investment Owned, at Fair Value $ 577 $ 411      
Percent of net assets 0.20% 0.10% 0.20% 0.10%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 10.50% 9.50% 10.50% 9.50%  
Investment Interest Rate 14.96% 14.96% 14.96% 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  
Investment Owned, Balance, Principal Amount $ 2,654 $ 2,628      
Investment Owned, at Cost 2,645 2,606      
Investment Owned, at Fair Value $ 2,642 $ 2,613      
Investment, Interest Rate, Paid in Kind 2.00% 1.00% 2.00% 1.00%  
Investment, Interest Rate, Paid in Cash 12.96% 13.96% 12.96% 13.96%  
Percent of net assets 0.90% 0.80% 0.90% 0.80%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 10.50% 9.50% 10.50% 9.50%  
Investment Interest Rate 14.96% 14.96% 14.96% 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  
Investment Owned, Balance, Principal Amount $ 13,013 $ 12,891      
Investment Owned, at Cost 12,972 12,787      
Investment Owned, at Fair Value $ 12,955 $ 12,818      
Investment, Interest Rate, Paid in Kind 2.00% 1.00% 2.00% 1.00%  
Investment, Interest Rate, Paid in Cash 12.96% 13.96% 12.96% 13.96%  
Percent of net assets 4.50% 4.10% 4.50% 4.10%  
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]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Acquisition Date Aug. 28, 2020 Aug. 28, 2020      
Investment Owned, Balance, Shares | shares 1,100 1,100 1,100 1,100  
Investment Owned, at Cost $ 1,100 $ 1,100      
Investment Owned, at Fair Value $ 907 $ 1,330      
Percent of net assets 0.30% 0.40% 0.30% 0.40%  
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:BLProductsParentLPMember 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 Feb. 01, 2022      
Investment Owned, Balance, Shares | shares 733 733 733 733  
Investment Owned, at Cost $ 788 $ 788      
Investment Owned, at Fair Value $ 1,012 $ 1,053      
Percent of net assets 0.40% 0.30% 0.40% 0.30%  
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:BPII-JLGroupHoldingsLPMember 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 Dec. 29, 2021      
Investment Owned, Balance, Shares | shares 90 83 90 83  
Investment Owned, at Cost $ 942 $ 825      
Investment Owned, at Fair Value $ 1,400 $ 983      
Percent of net assets 0.50% 0.30% 0.50% 0.30%  
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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services   Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 10.81%   10.81%    
Investment, Acquisition Date Apr. 04, 2024        
Investment Maturity Date Mar. 30, 2029   Mar. 30, 2029    
Investment Owned, Balance, Principal Amount $ 459        
Investment Owned, at Cost 447        
Investment Owned, at Fair Value $ 461        
Percent of net assets 0.20%   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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Data Processing & Outsourced Services   Data Processing & Outsourced Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 10.77%   10.77%    
Investment, Acquisition Date Apr. 04, 2024        
Investment Maturity Date Mar. 30, 2029   Mar. 30, 2029    
Investment Owned, Balance, Principal Amount $ 7,779        
Investment Owned, at Cost 7,580        
Investment Owned, at Fair Value $ 7,691        
Percent of net assets 2.70%   2.70%    
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc) First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:BannerIndustriesIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Construction & Engineering   Construction & Engineering  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   11.38%   11.38%  
Investment, Acquisition Date   Dec. 01, 2023      
Investment Maturity Date   Jan. 02, 2029   Jan. 02, 2029  
Investment Owned, Balance, Principal Amount   $ 140      
Investment Owned, at Cost   137      
Investment Owned, at Fair Value   $ 137      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Banner Acquisition Holdings, LLC [Member] Banner Acquisition 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] 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]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.25% 6.00% 6.25% 6.00%  
Investment Interest Rate 10.59% 11.38% 10.59% 11.38%  
Investment, Acquisition Date Dec. 21, 2023 Dec. 21, 2023      
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 1,502 $ 1,400      
Investment Owned, at Cost 1,472 1,366      
Investment Owned, at Fair Value $ 1,477 $ 1,365      
Fair Value As A Percentage of Member's Equity 4.30% 3.80%      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Banner Acquisition Holdings, LLC [Member] Banner Acquisition Holdings, 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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.00% 6.25% 6.00%  
Investment Interest Rate 10.61% 11.37% 10.61% 11.37%  
Investment, Acquisition Date Dec. 21, 2023 Dec. 21, 2023      
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 420 $ 196      
Investment Owned, at Cost 412 191      
Investment Owned, at Fair Value $ 415 $ 191      
Fair Value As A Percentage of Member's Equity 1.20% 0.60%      
Investment, Identifier [Axis]: Banner Acquisition Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Banner Acquisition Holdings, LLC [Member] Banner Acquisition Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.00% 6.25% 6.00%  
Investment Interest Rate 10.61% 11.38% 10.61% 11.38%  
Investment, Acquisition Date Dec. 21, 2023 Dec. 21, 2023      
Investment Maturity Date Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029 Jan. 02, 2029  
Investment Owned, Balance, Principal Amount $ 3,033 $ 3,091      
Investment Owned, at Cost 2,974 3,015      
Investment Owned, at Fair Value $ 2,981 $ 3,015      
Fair Value As A Percentage of Member's Equity 8.60% 8.70%      
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Barrett Purchaser LLC [Member] Barrett Purchaser 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] 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] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00% 6.00%  
Investment Interest Rate 10.51% 11.36% 10.51% 11.36%  
Investment, Acquisition Date Jan. 10, 2024 Nov. 21, 2023      
Investment Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029  
Investment Owned, at Fair Value $ (2)        
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Barrett Purchaser LLC [Member] Barrett Purchaser 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] Research & Consulting Services Research & Consulting Services Research & Consulting Services Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember whfcl:SecuredOvernightFinancingRateSofrMember us-gaap:PrimeRateMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 5.00% 6.00% 5.00% 6.00%  
Investment Interest Rate 12.50% 11.36% 12.50% 11.36%  
Investment, Acquisition Date Jan. 10, 2024 Nov. 21, 2023      
Investment Maturity Date Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028 Nov. 21, 2028  
Investment Owned, Balance, Principal Amount $ 60        
Investment Owned, at Cost 58        
Investment Owned, at Fair Value $ 63        
Fair Value As A Percentage of Member's Equity 0.20%        
Investment, Identifier [Axis]: Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.) First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Barrett Purchaser LLC [Member] Barrett Purchaser LLC [Member]      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 0.75% 0.75% 0.75% 0.75%  
Spread Above Index 6.00% 6.00% 6.00% 6.00%  
Investment Interest Rate 10.51% 11.36% 10.51% 11.36%  
Investment, Acquisition Date Jan. 10, 2024 Nov. 21, 2023      
Investment Maturity Date Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029 Nov. 21, 2029  
Investment Owned, Balance, Principal Amount $ 3,617 $ 3,654      
Investment Owned, at Cost 3,543 3,564      
Investment Owned, at Fair Value $ 3,574 $ 3,564      
Fair Value As A Percentage of Member's Equity 10.30%        
Percent of net assets   1.10%   1.10%  
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.94%   9.94%    
Investment, Acquisition Date Sep. 13, 2024        
Investment Maturity Date Dec. 05, 2028   Dec. 05, 2028    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.94%   9.94%    
Investment, Acquisition Date Sep. 13, 2024        
Investment Maturity Date Dec. 05, 2028   Dec. 05, 2028    
Investment Owned, Balance, Principal Amount $ 3,681        
Investment Owned, at Cost 3,633        
Investment Owned, at Fair Value $ 3,675        
Fair Value As A Percentage of Member's Equity 10.60%        
Investment, Identifier [Axis]: Branford Filtration, LLC (d/b/a Clean Solutions Group) First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   Branford Filtration, LLC [Member]      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services   Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   Nov. 17, 2023      
Investment Maturity Date   Nov. 17, 2028   Nov. 17, 2028  
Investment, Identifier [Axis]: Branford Filtration, LLC (d/b/a Clean Solutions Group) First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   Branford Filtration, LLC [Member]      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services   Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   Nov. 17, 2023      
Investment Maturity Date   Nov. 17, 2028   Nov. 17, 2028  
Investment Owned, Balance, Principal Amount   $ 11,613      
Investment Owned, at Cost   11,358      
Investment Owned, at Fair Value   $ 11,358      
Percent of net assets   3.60%   3.60%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 8.00% 8.00% 8.00% 8.00%  
Investment Interest Rate 12.46% 13.46% 12.46% 13.46%  
Investment, Acquisition Date Oct. 05, 2021 Oct. 05, 2021      
Investment Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026  
Investment Owned, Balance, Principal Amount $ 238        
Investment Owned, at Cost 237        
Investment Owned, at Fair Value $ 231 $ (1)      
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 8.00% 8.00% 8.00% 8.00%  
Investment Interest Rate 12.46% 13.46% 12.46% 13.46%  
Investment, Acquisition Date Oct. 05, 2021 Oct. 05, 2021      
Investment Maturity Date Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026 Oct. 05, 2026  
Investment Owned, Balance, Principal Amount $ 8,517 $ 9,073      
Investment Owned, at Cost 8,457 8,973      
Investment Owned, at Fair Value $ 8,429 $ 8,967      
Percent of net assets 2.90% 2.80% 2.90% 2.80%  
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  
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, 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% 6.50% 5.00% 6.50%  
Investment Interest Rate 8.45% 11.96% 8.45% 11.96%  
Investment, Acquisition Date Aug. 09, 2023 Aug. 09, 2023      
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 2,168        
Investment Owned, at Cost 2,120        
Investment Owned, at Fair Value $ 2,183 $ (3)      
Fair Value As A Percentage of Member's Equity 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  
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, 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 6.50% 6.50% 6.50% 6.50%  
Investment Interest Rate 10.96% 11.96% 10.96% 11.96%  
Investment, Acquisition Date Aug. 09, 2023 Aug. 09, 2023      
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 234 $ 180      
Investment Owned, at Cost 230 176      
Investment Owned, at Fair Value $ 248 $ 181      
Fair Value As A Percentage of Member's Equity 0.70% 0.50%      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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, 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 6.42% 6.50% 6.42% 6.50%  
Investment Interest Rate 10.88% 11.96% 10.88% 11.96%  
Investment, Acquisition Date Aug. 09, 2023 Aug. 09, 2023      
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 6,904 $ 5,985      
Investment Owned, at Cost 6,774 5,845      
Investment Owned, at Fair Value $ 6,952 $ 5,898      
Fair Value As A Percentage of Member's Equity 20.10% 17.00%      
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:BulkMidcoLLCMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Wireless Telecommunication Services   Wireless Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   12.96%   12.96%  
Investment, Acquisition Date   Oct. 28, 2022      
Investment Maturity Date   Jun. 10, 2024   Jun. 10, 2024  
Investment Owned, Balance, Principal Amount   $ 2,000      
Investment Owned, at Cost   1,989      
Investment Owned, at Fair Value   $ 1,972      
Investment, Interest Rate, Paid in Kind   1.00%   1.00%  
Investment, Interest Rate, Paid in Cash   11.96%   11.96%  
Percent of net assets   0.60%   0.60%  
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:BulkMidcoLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Wireless Telecommunication Services   Wireless Telecommunication Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   12.96%   12.96%  
Investment, Acquisition Date   Oct. 28, 2022      
Investment Maturity Date   Jun. 10, 2024   Jun. 10, 2024  
Investment Owned, Balance, Principal Amount   $ 19,267      
Investment Owned, at Cost   19,237      
Investment Owned, at Fair Value   $ 18,997      
Investment, Interest Rate, Paid in Kind   1.00%   1.00%  
Investment, Interest Rate, Paid in Cash   11.96%   11.96%  
Percent of net assets   6.00%   6.00%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Acquisition Date May 04, 2021 May 04, 2021      
Investment Owned, Balance, Shares | shares 1,068 1,068 1,068 1,068  
Investment Owned, at Cost $ 1,116 $ 1,116      
Investment Owned, at Fair Value $ 2,232 $ 1,715      
Percent of net assets 0.80% 0.50% 0.80% 0.50%  
Investment, Identifier [Axis]: Camarillo Fitness Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:CamarilloFitnessHoldingsLlcMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member]   Leisure Facilities [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.50%   8.50%    
Investment, Acquisition Date Sep. 25, 2024        
Investment Maturity Date Sep. 25, 2029   Sep. 25, 2029    
Investment Owned, Balance, Principal Amount $ 11,738        
Investment Owned, at Cost 10,269        
Investment Owned, at Fair Value $ 10,492        
Investment, Interest Rate, Paid in Kind 12.98%   12.98%    
Percent of net assets 3.70%   3.70%    
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 whfcl:CampFacilityServicesHoldingsLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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 10.96% 11.96% 10.96% 11.96%  
Investment, Acquisition Date Nov. 16, 2021 Nov. 16, 2021      
Investment Maturity Date Nov. 16, 2027 Nov. 16, 2027 Nov. 16, 2027 Nov. 16, 2027  
Investment Owned, Balance, Principal Amount $ 10,424 $ 11,668      
Investment Owned, at Cost 10,325 11,517      
Investment Owned, at Fair Value $ 9,905 $ 11,496      
Percent of net assets 3.50% 3.60% 3.50% 3.60%  
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] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]  
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 Interest Rate 10.00% 10.00% 10.00% 10.00%  
Investment, Acquisition Date Nov. 16, 2021 Nov. 16, 2021      
Investment Owned, Balance, Shares | shares 15 15 15 15  
Investment Owned, at Cost $ 840 $ 840      
Investment Owned, at Fair Value $ 162 $ 1,023      
Investment, Interest Rate, Paid in Kind 10.00% 10.00% 10.00% 10.00%  
Percent of net assets 0.10% 0.30% 0.10% 0.30%  
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxHoldingsLimitedMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
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    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 10.40%   10.40%    
Investment, Acquisition Date Sep. 11, 2024        
Investment Maturity Date May 04, 2029   May 04, 2029    
Investment Owned, at Fair Value $ 2        
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxHoldingsLimitedMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 10.40%   10.40%    
Investment, Acquisition Date Sep. 11, 2024        
Investment Maturity Date May 04, 2029   May 04, 2029    
Investment Owned, Balance, Principal Amount $ 513        
Investment Owned, at Cost 665        
Investment Owned, at Fair Value $ 643        
Fair Value As A Percentage of Member's Equity 1.90%        
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
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  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.25%   6.25%  
Investment Interest Rate   11.56%   11.56%  
Investment, Acquisition Date   Jul. 16, 2021      
Investment Maturity Date   May 04, 2026   May 04, 2026  
Investment Owned, Balance, Principal Amount   $ 864      
Investment Owned, at Cost   1,182      
Investment Owned, at Fair Value   $ 1,082      
Investment, Interest Rate, Paid in Kind   0.25%   0.25%  
Investment, Interest Rate, Paid in Cash   11.31%   11.31%  
Fair Value As A Percentage of Member's Equity   3.10%      
Investment, Identifier [Axis]: Cennox Holdings Limited., First lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:CennoxHoldingsLimitedMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.25%   6.25%  
Investment, Acquisition Date   Jul. 16, 2021      
Investment Maturity Date   May 04, 2026   May 04, 2026  
Investment Owned, Balance, Principal Amount   $ 2,825      
Investment Owned, at Cost   3,863      
Investment Owned, at Fair Value   $ 3,538      
Fair Value As A Percentage of Member's Equity   10.20%      
Investment, Identifier [Axis]: Cennox, Inc, First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
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    
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 5.50%   5.50%    
Investment Interest Rate 10.25%   10.25%    
Investment, Acquisition Date Sep. 11, 2024        
Investment Maturity Date May 04, 2029   May 04, 2029    
Investment Owned, Balance, Principal Amount $ 29        
Investment Owned, at Cost 29        
Investment Owned, at Fair Value $ 30        
Fair Value As A Percentage of Member's Equity 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 9.14%   9.14%    
Investment, Acquisition Date Sep. 11, 2024        
Investment Maturity Date May 04, 2029   May 04, 2029    
Investment Owned, Balance, Principal Amount $ 594        
Investment Owned, at Cost 649        
Investment Owned, at Fair Value $ 611        
Fair Value As A Percentage of Member's Equity 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      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   10.44%   10.44%  
Investment, Acquisition Date   Jun. 28, 2022      
Investment Maturity Date   May 04, 2026   May 04, 2026  
Investment Owned, Balance, Principal Amount   $ 9,422      
Investment Owned, at Cost   9,851      
Investment Owned, at Fair Value   $ 10,257      
Investment, Interest Rate, Paid in Kind   0.25%   0.25%  
Investment, Interest Rate, Paid in Cash   10.19%   10.19%  
Fair Value As A Percentage of Member's Equity   29.60%      
Investment, Identifier [Axis]: Cennox, Inc. First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:CennoxInc.Member        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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    
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 5.50%   5.50%    
Investment Interest Rate 10.34%   10.34%    
Investment, Acquisition Date Sep. 11, 2024        
Investment Maturity Date May 04, 2029   May 04, 2029    
Investment Owned, Balance, Principal Amount $ 3,350        
Investment Owned, at Cost 3,319        
Investment Owned, at Fair Value $ 3,344        
Fair Value As A Percentage of Member's Equity 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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
Investment Interest Rate 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  
Investment Owned, Balance, Principal Amount $ 3,342 $ 2,962      
Investment Owned, at Cost 3,342 2,962      
Investment Owned, at Fair Value $ 3,342 $ 2,793      
Investment, Interest Rate, Paid in Kind 12.00% 12.00% 12.00% 12.00%  
Percent of net assets 1.20% 0.90% 1.20% 0.90%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 8.31% 7.56% 8.31% 7.56%  
Investment Interest Rate 14.13% 14.41% 14.13% 14.41%  
Investment, Acquisition Date Dec. 30, 2020 Dec. 30, 2020      
Investment Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025  
Investment Owned, Balance, Principal Amount $ 632 $ 632      
Investment Owned, at Cost 630 628      
Investment Owned, at Fair Value $ 555 $ 496      
Investment, Interest Rate, Paid in Kind 2.25% 1.50% 2.25% 1.50%  
Investment, Interest Rate, Paid in Cash 11.88% 12.91% 11.88% 12.91%  
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 8.75% 8.00% 8.75% 8.00%  
Investment Interest Rate 13.21% 13.50% 13.21% 13.50%  
Investment, Acquisition Date Dec. 30, 2020 Dec. 30, 2020      
Investment Maturity Date Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025 Dec. 30, 2025  
Investment Owned, Balance, Principal Amount $ 5,711 $ 7,452      
Investment Owned, at Cost 5,690 7,395      
Investment Owned, at Fair Value $ 5,085 $ 6,405      
Investment, Interest Rate, Paid in Kind 2.25% 1.50% 2.25% 1.50%  
Investment, Interest Rate, Paid in Cash 10.96% 12.00% 10.96% 12.00%  
Percent of net assets 1.80% 2.00% 1.80% 2.00%  
Investment, Identifier [Axis]: Clark Restaurant Service, LLC, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:ClarkRestaurantServiceLlcMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.11%   10.11%    
Investment, Acquisition Date Jun. 14, 2024        
Investment Maturity Date May 10, 2029   May 10, 2029    
Investment Owned, Balance, Principal Amount $ 5,006        
Investment Owned, at Cost 4,919        
Investment Owned, at Fair Value $ 4,993        
Fair Value As A Percentage of Member's Equity 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 7.59% 7.58% 7.59% 7.58%  
Investment Interest Rate 12.39% 13.14% 12.39% 13.14%  
Investment, Acquisition Date Oct. 12, 2021 Oct. 12, 2021      
Investment Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026  
Investment Owned, Balance, Principal Amount $ 15,955 $ 15,955      
Investment Owned, at Cost 15,802 15,715      
Investment Owned, at Fair Value $ 16,032 $ 15,954      
Percent of net assets 5.60% 5.00% 5.60% 5.00%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [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% 7.00% 6.50% 7.00%  
Investment Interest Rate 10.96% 12.46% 10.96% 12.46%  
Investment, Acquisition Date Dec. 30, 2021 Dec. 30, 2021      
Investment Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026  
Investment Owned, at Fair Value $ 1 $ (3)      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadcasting [Member] Broadcasting [Member] Broadcasting [Member] Broadcasting [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% 7.00% 6.50% 7.00%  
Investment Interest Rate 10.96% 12.46% 10.96% 12.46%  
Investment, Acquisition Date Dec. 30, 2021 Dec. 30, 2021      
Investment Maturity Date Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026 Dec. 30, 2026  
Investment Owned, Balance, Principal Amount $ 7,879 $ 7,418      
Investment Owned, at Cost 7,808 7,329      
Investment Owned, at Fair Value $ 7,832 $ 7,246      
Percent of net assets 2.70% 2.30% 2.70% 2.30%  
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:DrewFoamCompaniesIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.25%   7.25%  
Investment Interest Rate   12.75%   12.75%  
Investment, Acquisition Date   Nov. 09, 2020      
Investment Maturity Date   Nov. 05, 2025   Nov. 05, 2025  
Investment Owned, Balance, Principal Amount   $ 13,644      
Investment Owned, at Cost   13,541      
Investment Owned, at Fair Value   $ 13,313      
Fair Value As A Percentage of Member's Equity   38.40%      
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:DrewFoamCompaniesIncMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.48%   10.48%    
Investment, Acquisition Date Nov. 09, 2020        
Investment Maturity Date Dec. 07, 2026   Dec. 07, 2026    
Investment Owned, Balance, Principal Amount $ 13,501        
Investment Owned, at Cost 13,445        
Investment Owned, at Fair Value $ 13,437        
Fair Value As A Percentage of Member's Equity 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      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   5.50%   5.50%  
Investment Interest Rate   11.00%   11.00%  
Investment, Acquisition Date   Jul. 15, 2021      
Investment Maturity Date   Jun. 23, 2027   Jun. 23, 2027  
Investment Owned, Balance, Principal Amount   $ 8,604      
Investment Owned, at Cost   8,541      
Investment Owned, at Fair Value   $ 8,562      
Fair Value As A Percentage of Member's Equity   24.70%      
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.98%   9.98%    
Investment, Acquisition Date Jul. 15, 2021        
Investment Maturity Date Jun. 23, 2027   Jun. 23, 2027    
Investment Owned, Balance, Principal Amount $ 8,342        
Investment Owned, at Cost 8,299        
Investment Owned, at Fair Value $ 8,342        
Fair Value As A Percentage of Member's Equity 24.10%        
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:EddyAcquisitionsLLCMember whfcl:EddyAcquisitionsLLCMember      
Investment, Type [Extensible Enumeration] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]  
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]  
Investment Interest Rate 12.00% 12.00% 12.00% 12.00%  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021      
Investment Owned, Balance, Shares | shares 167 167 167 167  
Investment Owned, at Cost $ 167 $ 167      
Investment Owned, at Fair Value   $ 18      
Investment, Identifier [Axis]: Education Dynamics, LLC Senior Preferred Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:EducationDynamicsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:SeniorPreferredUnitsMember   whfcl:SeniorPreferredUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member]   Education Services [Member]    
Investment, Acquisition Date Sep. 15, 2021        
Investment Owned, Balance, Shares | shares 167   167    
Investment Owned, at Cost $ 167        
Investment Owned, at Fair Value $ 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  
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]  
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% 7.00% 6.50% 7.00%  
Investment Interest Rate 10.96% 12.46% 10.96% 12.46%  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021      
Investment Maturity Date Sep. 15, 2027 Sep. 15, 2026 Sep. 15, 2027 Sep. 15, 2026  
Investment Owned, at Fair Value $ (51) $ (22)      
Investment, Interest Rate, Paid in Kind   0.50%   0.50%  
Investment, Interest Rate, Paid in Cash   11.96%   11.96%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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]  
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% 7.00% 6.50% 7.00%  
Investment Interest Rate 10.96% 12.46% 10.96% 12.46%  
Investment, Acquisition Date Sep. 15, 2021 Sep. 15, 2021      
Investment Maturity Date Sep. 15, 2027 Sep. 15, 2026 Sep. 15, 2027 Sep. 15, 2026  
Investment Owned, Balance, Principal Amount $ 13,089 $ 12,784      
Investment Owned, at Cost 12,989 12,647      
Investment Owned, at Fair Value $ 12,449 $ 12,407      
Investment, Interest Rate, Paid in Kind   0.50%   0.50%  
Investment, Interest Rate, Paid in Cash   11.96%   11.96%  
Percent of net assets 4.30% 4.00% 4.30% 4.00%  
Investment, Identifier [Axis]: EducationDynamics, LLC Subordinated Unsecured Term Loa          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:EducationDynamicsLLCMember      
Investment, Type [Extensible Enumeration]   whfcl:SubordinatedUnsecuredTermLoanMember   whfcl:SubordinatedUnsecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Education Services [Member]   Education Services [Member]  
Investment Interest Rate   4.00%   4.00%  
Investment, Acquisition Date   Sep. 15, 2021      
Investment Maturity Date   Mar. 15, 2027   Mar. 15, 2027  
Investment Owned, Balance, Principal Amount   $ 167      
Investment Owned, at Cost   167      
Investment Owned, at Fair Value   $ 167      
Percent of net assets   0.10%   0.10%  
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:EmpireOfficeIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Office Services And Supplies [Member]   Office Services And Supplies [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.50%   1.50%  
Spread Above Index   6.75%   6.75%  
Investment Interest Rate   12.21%   12.21%  
Investment, Acquisition Date   Aug. 17, 2021      
Investment Maturity Date   Apr. 12, 2024   Apr. 12, 2024  
Investment Owned, Balance, Principal Amount   $ 4,556      
Investment Owned, at Cost   4,545      
Investment Owned, at Fair Value   $ 4,556      
Percent of net assets   1.40%   1.40%  
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:EmpireOfficeIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Office Services And Supplies [Member]   Office Services And Supplies [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.50%   1.50%  
Spread Above Index   6.75%   6.75%  
Investment Interest Rate   12.21%   12.21%  
Investment, Acquisition Date   Apr. 12, 2019      
Investment Maturity Date   Apr. 12, 2024   Apr. 12, 2024  
Investment Owned, Balance, Principal Amount   $ 10,947      
Investment Owned, at Cost   10,931      
Investment Owned, at Fair Value   $ 10,947      
Percent of net assets   3.50%   3.50%  
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Security & Alarm Services [Member]   Security & Alarm Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.75%   6.75%    
Investment Interest Rate 11.11%   11.11%    
Investment, Acquisition Date Jan. 31, 2024        
Investment Maturity Date Jan. 31, 2029   Jan. 31, 2029    
Investment Owned, Balance, Principal Amount $ 7,000        
Investment Owned, at Cost 6,857        
Investment Owned, at Fair Value $ 7,070        
Percent of net assets 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 whfcl:FgiAcquisitionCorpMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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 10.98% 12.00% 10.98% 12.00%  
Investment, Acquisition Date Oct. 28, 2019 Oct. 28, 2019      
Investment Maturity Date Oct. 29, 2026 Oct. 29, 2026 Oct. 29, 2026 Oct. 29, 2026  
Investment Owned, Balance, Principal Amount $ 16,026 $ 16,193      
Investment Owned, at Cost 15,765 15,786      
Investment Owned, at Fair Value $ 16,026 $ 16,110      
Percent of net assets 5.60% 5.10% 5.60% 5.10%  
Investment, Identifier [Axis]: FloWorks International LLC First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:FloworksInternationalLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.40%   10.40%    
Investment, Acquisition Date Dec. 12, 2024        
Investment Maturity Date 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 0.75%   0.75%    
Spread Above Index 4.75%   4.75%    
Investment Interest Rate 9.27%   9.27%    
Investment, Acquisition Date Dec. 12, 2024        
Investment Maturity Date Nov. 26, 2031   Nov. 26, 2031    
Investment Owned, Balance, Principal Amount $ 5,333        
Investment Owned, at Cost 5,280        
Investment Owned, at Fair Value $ 5,281        
Fair Value As A Percentage of Member's Equity 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors  
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 8.00% 8.00% 8.00% 8.00%  
Investment Interest Rate 12.62% 13.52% 12.62% 13.52%  
Investment, Acquisition Date Nov. 22, 2022 Nov. 22, 2022      
Investment Maturity Date Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025 Dec. 09, 2025  
Investment Owned, Balance, Principal Amount $ 357 $ 357      
Investment Owned, at Cost 357 357      
Investment Owned, at Fair Value $ 321 $ 200      
Percent of net assets 0.10% 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: Foodservices Brand Group, LLC Second Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:FoodservicesBrandGroupLlcMember      
Investment, Type [Extensible Enumeration]   whfcl:SecondLienSecuredTermLoanMember   whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Distributors   Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.50%   1.50%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   Nov. 22, 2022      
Investment Maturity Date   Jan. 08, 2026   Jan. 08, 2026  
Investment Owned, Balance, Principal Amount   $ 5,171      
Investment Owned, at Cost   4,915      
Investment Owned, at Fair Value   $ 1,601      
Percent of net assets   0.50%   0.50%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] 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]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.25% 11.23% 12.25%  
Investment, Acquisition Date Mar. 11, 2022 Mar. 11, 2022      
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 3,023 $ 3,054      
Investment Owned, at Cost 3,000 3,018      
Investment Owned, at Fair Value $ 3,023 $ 3,025      
Fair Value As A Percentage of Member's Equity 8.70% 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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] 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]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.25% 11.23% 12.25%  
Investment, Acquisition Date Feb. 18, 2022 Feb. 18, 2022      
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, at Fair Value $ 5 $ 1      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] 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]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.25% 11.23% 12.25%  
Investment, Acquisition Date Feb. 18, 2022 Feb. 18, 2022      
Investment Maturity Date Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026 Dec. 15, 2026  
Investment Owned, Balance, Principal Amount $ 9,007 $ 9,100      
Investment Owned, at Cost 8,937 8,991      
Investment Owned, at Fair Value $ 9,007 $ 9,014      
Fair Value As A Percentage of Member's Equity 26.10% 26.00%      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 8.25% 8.25% 8.25% 8.25%  
Investment Interest Rate 12.90% 13.69% 12.90% 13.69%  
Investment, Acquisition Date Dec. 23, 2016 Dec. 23, 2016      
Investment Maturity Date Dec. 05, 2025 Dec. 05, 2025 Dec. 05, 2025 Dec. 05, 2025  
Investment Owned, Balance, Principal Amount $ 20,420 $ 21,665      
Investment Owned, at Cost 20,382 21,582      
Investment Owned, at Fair Value $ 20,420 $ 21,480      
Percent of net assets 7.10% 6.80% 7.10% 6.80%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.50% 6.00% 6.50%  
Investment Interest Rate 9.49% 11.94% 9.49% 11.94%  
Investment, Acquisition Date Jan. 22, 2020 Jan. 22, 2020      
Investment Maturity Date Dec. 21, 2026 Dec. 19, 2024 Dec. 21, 2026 Dec. 19, 2024  
Investment Owned, at Fair Value $ 2 $ 5      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianOvernightRepoRateAverageMember whfcl:CanadianDollarOfferedRateMember  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.00% 6.50% 6.00% 6.50%  
Investment Interest Rate 9.49% 11.94% 9.49% 11.94%  
Investment, Acquisition Date Jan. 22, 2020 Jan. 22, 2020      
Investment Maturity Date Dec. 21, 2026 Dec. 19, 2024 Dec. 21, 2026 Dec. 19, 2024  
Investment Owned, Balance, Principal Amount $ 18,415 $ 19,416      
Investment Owned, at Cost 14,234 14,969      
Investment Owned, at Fair Value $ 12,883 $ 14,654      
Fair Value As A Percentage of Member's Equity 37.20% 42.30%      
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 7.50% 7.00% 7.50% 7.00%  
Investment Interest Rate 11.95% 12.46% 11.95% 12.46%  
Investment, Acquisition Date Dec. 16, 2022 Dec. 16, 2022      
Investment Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028  
Investment Owned, Balance, Principal Amount $ 453        
Investment Owned, at Cost 444        
Investment Owned, at Fair Value $ 447 $ 7      
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 7.60% 7.00% 7.60% 7.00%  
Investment Interest Rate 11.96% 12.46% 11.96% 12.46%  
Investment, Acquisition Date Dec. 16, 2022 Dec. 16, 2022      
Investment Maturity Date Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028 Dec. 18, 2028  
Investment Owned, Balance, Principal Amount $ 8,994 $ 4,804      
Investment Owned, at Cost 8,811 4,685      
Investment Owned, at Fair Value $ 8,857 $ 4,738      
Percent of net assets 3.10% 1.50% 3.10% 1.50%  
Investment, Identifier [Axis]: H I G Camarillo, LP, Limited Partners Interests          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:HIGCamarilloLpMember        
Investment, Type [Extensible Enumeration] whfcl:LimitedPartnerInterestsMember   whfcl:LimitedPartnerInterestsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Facilities [Member]   Leisure Facilities [Member]    
Investment, Acquisition Date Sep. 25, 2024        
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:HCSalonHoldingsIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   12.11%   12.11%  
Investment, Acquisition Date   Sep. 30, 2021      
Investment Maturity Date   Sep. 30, 2026   Sep. 30, 2026  
Investment Owned, at Fair Value   $ 8      
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:HCSalonHoldingsIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   12.11%   12.11%  
Investment, Acquisition Date   Sep. 30, 2021      
Investment Maturity Date   Sep. 30, 2026   Sep. 30, 2026  
Investment Owned, Balance, Principal Amount   $ 11,404      
Investment Owned, at Cost   11,279      
Investment Owned, at Fair Value   $ 11,404      
Percent of net assets   3.60%   3.60%  
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  
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] 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 6.97% 6.22% 6.97% 6.22%  
Investment Interest Rate 11.29% 12.10% 11.29% 12.10%  
Investment, Acquisition Date Feb. 18, 2022 Feb. 18, 2022      
Investment Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026  
Investment Owned, Balance, Principal Amount $ 1,395 $ 2,398      
Investment Owned, at Cost 1,384 2,369      
Investment Owned, at Fair Value $ 1,354 $ 2,282      
Fair Value As A Percentage of Member's Equity 3.90% 6.60%      
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  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.25% 6.25% 6.25%  
Investment Interest Rate 11.02% 11.80% 11.02% 11.80%  
Investment, Acquisition Date Feb. 18, 2022 Feb. 18, 2022      
Investment Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026  
Investment Owned, Balance, Principal Amount $ 483 $ 596      
Investment Owned, at Cost 480 589      
Investment Owned, at Fair Value $ 455 $ 547      
Fair Value As A Percentage of Member's Equity 1.30% 1.60%      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.25% 6.25% 6.25% 6.25%  
Investment Interest Rate 11.02% 11.80% 11.02% 11.80%  
Investment, Acquisition Date Dec. 28, 2021 Dec. 28, 2021      
Investment Maturity Date Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026 Oct. 19, 2026  
Investment Owned, Balance, Principal Amount $ 5,563 $ 9,555      
Investment Owned, at Cost 5,523 9,448      
Investment Owned, at Fair Value $ 5,395 $ 9,074      
Fair Value As A Percentage of Member's Equity 15.60% 26.20%      
Investment, Identifier [Axis]: Hollander Intermediate LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:HollanderIntermediateLlcMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Home Furnishings [Member]   Home Furnishings [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   3.00%   3.00%  
Spread Above Index   10.75%   10.75%  
Investment Interest Rate   16.22%   16.22%  
Investment, Acquisition Date   Sep. 19, 2022      
Investment Maturity Date   Sep. 21, 2026   Sep. 21, 2026  
Investment Owned, Balance, Principal Amount   $ 4,689      
Investment Owned, at Cost   4,661      
Investment Owned, at Fair Value   $ 4,179      
Percent of net assets   1.30%   1.30%  
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   Honors Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Leisure Facilities [Member]   Leisure Facilities [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.37%   6.37%  
Investment Interest Rate   11.90%   11.90%  
Investment, Acquisition Date   Sep. 06, 2019      
Investment Maturity Date   Sep. 06, 2024   Sep. 06, 2024  
Investment Owned, Balance, Principal Amount   $ 4,650      
Investment Owned, at Cost   4,631      
Investment Owned, at Fair Value   $ 4,603      
Percent of net assets   1.50%   1.50%  
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   Honors Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Leisure Facilities [Member]   Leisure Facilities [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.49%   6.49%  
Investment Interest Rate   12.02%   12.02%  
Investment, Acquisition Date   Sep. 06, 2019      
Investment Maturity Date   Sep. 06, 2024   Sep. 06, 2024  
Investment Owned, Balance, Principal Amount   $ 9,441      
Investment Owned, at Cost   9,375      
Investment Owned, at Fair Value   $ 9,347      
Percent of net assets   3.00%   3.00%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 5.50% 5.50% 5.50% 5.50%  
Investment Interest Rate 10.35% 11.11% 10.35% 11.11%  
Investment, Acquisition Date Feb. 17, 2022 Feb. 17, 2022      
Investment Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026  
Investment Owned, at Fair Value $ 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 5.50% 5.50% 5.50% 5.50%  
Investment Interest Rate 10.35% 11.11% 10.35% 11.11%  
Investment, Acquisition Date Feb. 17, 2022 Feb. 17, 2022      
Investment Maturity Date Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026 Jun. 15, 2026  
Investment Owned, Balance, Principal Amount $ 3,307 $ 3,541      
Investment Owned, at Cost 3,286 3,503      
Investment Owned, at Fair Value $ 3,307 $ 3,504      
Fair Value As A Percentage of Member's Equity 9.60% 10.10%      
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:ImageOneIndustriesLLCMember whfcl:ImageOneIndustriesLLCMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonAUnitsMember whfcl:CommonUnitsMember whfcl:CommonAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Advertising Advertising Advertising Advertising  
Investment, Acquisition Date Sep. 20, 2019 Sep. 20, 2019      
Investment Owned, Balance, Shares | shares 235 149 235 149  
Investment Owned, at Cost $ 10 $ 7      
Investment Owned, at Fair Value $ 12 $ 9      
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:IndustrialSpecialtyServicesUSALLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Environmental & Facilities Services   Environmental & Facilities Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.75%   6.75%  
Investment Interest Rate   12.25%   12.25%  
Investment, Acquisition Date   Dec. 31, 2021      
Investment Maturity Date   Dec. 31, 2026   Dec. 31, 2026  
Investment Owned, Balance, Principal Amount   $ 11,767      
Investment Owned, at Cost   11,626      
Investment Owned, at Fair Value   $ 11,537      
Percent of net assets   3.60%   3.60%  
Investment, Identifier [Axis]: JVMC Holdings Corp First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:JVMCHoldingsCorpMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Investment Banking & Brokerage   Investment Banking & Brokerage  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   Feb. 28, 2019      
Investment Maturity Date   Feb. 28, 2024   Feb. 28, 2024  
Investment Owned, Balance, Principal Amount   $ 3,522      
Investment Owned, at Cost   3,521      
Investment Owned, at Fair Value   $ 3,522      
Percent of net assets   1.10%   1.10%  
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  
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, 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 6.25% 6.25% 6.25% 6.25%  
Investment Interest Rate 10.85% 11.94% 10.85% 11.94%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022      
Investment Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026  
Investment Owned, Balance, Principal Amount $ 2,343 $ 2,366      
Investment Owned, at Cost 2,326 2,341      
Investment Owned, at Fair Value $ 2,343 $ 2,342      
Fair Value As A Percentage of Member's Equity 6.80% 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  
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, 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 6.25% 6.25% 6.25% 6.25%  
Investment Interest Rate 10.82% 12.11% 10.82% 12.11%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022      
Investment Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026  
Investment Owned, Balance, Principal Amount $ 517 $ 199      
Investment Owned, at Cost 513 197      
Investment Owned, at Fair Value $ 522 $ 193      
Fair Value As A Percentage of Member's Equity 1.50% 0.60%      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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, 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 6.25% 6.25% 6.25% 6.25%  
Investment Interest Rate 10.84% 11.86% 10.84% 11.86%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022      
Investment Maturity Date Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026 Dec. 29, 2026  
Investment Owned, Balance, Principal Amount $ 11,078 $ 11,192      
Investment Owned, at Cost 11,000 11,073      
Investment Owned, at Fair Value $ 11,078 $ 11,080      
Fair Value As A Percentage of Member's Equity 32.00% 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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 6.50% 6.50% 6.50% 6.50%  
Investment Interest Rate 11.02% 11.88% 11.02% 11.88%  
Investment, Acquisition Date Nov. 27, 2023 Nov. 27, 2023      
Investment Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028  
Investment Owned, at Fair Value $ 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 6.50% 6.50% 6.50% 6.50%  
Investment Interest Rate 11.02% 11.88% 11.02% 11.88%  
Investment, Acquisition Date Nov. 27, 2023 Nov. 27, 2023      
Investment Maturity Date Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028 Nov. 09, 2028  
Investment Owned, Balance, Principal Amount $ 6,354 $ 6,418      
Investment Owned, at Cost 6,256 6,294      
Investment Owned, at Fair Value $ 6,323 $ 6,295      
Fair Value As A Percentage of Member's Equity 18.30% 18.20%      
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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.09%   10.09%    
Investment, Acquisition Date Dec. 26, 2024        
Investment Maturity Date Dec. 31, 2029   Dec. 31, 2029    
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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Construction & Engineering   Construction & Engineering    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.09%   10.09%    
Investment, Acquisition Date Dec. 26, 2024        
Investment Maturity Date Dec. 31, 2029   Dec. 31, 2029    
Investment Owned, Balance, Principal Amount $ 3,611        
Investment Owned, at Cost 3,539        
Investment Owned, at Fair Value $ 3,539        
Percent of net assets 1.20%   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]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Acquisition Date Dec. 31, 2020 Dec. 31, 2020      
Investment Owned, Balance, Shares | shares 496 496 496 496  
Investment Owned, at Cost $ 496 $ 496      
Investment Owned, at Fair Value $ 779 $ 683      
Percent of net assets 0.30% 0.20% 0.30% 0.20%  
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.25%   6.25%  
Investment Interest Rate   11.93%   11.93%  
Investment, Acquisition Date   Jun. 22, 2021      
Investment Maturity Date   Feb. 24, 2026   Feb. 24, 2026  
Investment Owned, at Fair Value   $ (1)      
Investment, Identifier [Axis]: LINC Systems, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:LINCSystemsLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.25%   6.25%  
Investment Interest Rate   11.93%   11.93%  
Investment, Acquisition Date   Jun. 22, 2021      
Investment Maturity Date   Feb. 24, 2026   Feb. 24, 2026  
Investment Owned, Balance, Principal Amount   $ 8,534      
Investment Owned, at Cost   8,454      
Investment Owned, at Fair Value   $ 8,443      
Fair Value As A Percentage of Member's Equity   24.40%      
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:LINCSystemsLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.50%   8.50%    
Investment Interest Rate 12.99%   12.99%    
Investment, Acquisition Date Jun. 22, 2021        
Investment Maturity Date Feb. 24, 2026   Feb. 24, 2026    
Investment Owned, at Fair Value $ 3        
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:LINCSystemsLLCMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.50%   8.50%    
Investment Interest Rate 12.99%   12.99%    
Investment, Acquisition Date Jun. 22, 2021        
Investment Maturity Date Feb. 24, 2026   Feb. 24, 2026    
Investment Owned, Balance, Principal Amount $ 8,155        
Investment Owned, at Cost 8,114        
Investment Owned, at Fair Value $ 8,155        
Fair Value As A Percentage of Member's Equity 23.70%        
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:LMGHoldingsIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Electronic Equipment & Instruments   Electronic Equipment & Instruments  
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   6.50%   6.50%  
Investment Interest Rate   12.00%   12.00%  
Investment, Acquisition Date   Jun. 28, 2021      
Investment Maturity Date   Apr. 30, 2026   Apr. 30, 2026  
Investment Owned, Balance, Principal Amount   $ 13,330      
Investment Owned, at Cost   13,203      
Investment Owned, at Fair Value   $ 13,265      
Fair Value As A Percentage of Member's Equity   38.30%      
Investment, Identifier [Axis]: LMG Holdings, Inc. First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:LMGHoldingsIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Electronic Equipment & Instruments   Electronic Equipment & Instruments  
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   6.50%   6.50%  
Investment Interest Rate   12.00%   12.00%  
Investment, Acquisition Date   Jun. 28, 2021      
Investment Maturity Date   Apr. 30, 2026   Apr. 30, 2026  
Investment Owned, at Fair Value   $ 4      
Investment, Identifier [Axis]: LSCS Holdings, Inc Second Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:LSCSHoldingsIncMember whfcl:LSCSHoldingsIncMember      
Investment, Type [Extensible Enumeration] whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember whfcl:SecondLienSecuredTermLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Life Sciences Tools And Services [Member] Life Sciences Tools And Services [Member] Life Sciences Tools And Services [Member] Life Sciences Tools And Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 0.50% 0.50% 0.50% 0.50%  
Spread Above Index 8.00% 8.00% 8.00% 8.00%  
Investment Interest Rate 12.47% 13.47% 12.47% 13.47%  
Investment, Acquisition Date Nov. 23, 2021 Nov. 23, 2021      
Investment Maturity Date Dec. 16, 2029 Dec. 16, 2029 Dec. 16, 2029 Dec. 16, 2029  
Investment Owned, Balance, Principal Amount $ 5,000 $ 5,000      
Investment Owned, at Cost 4,953 4,944      
Investment Owned, at Fair Value $ 5,000 $ 4,901      
Percent of net assets 1.70% 1.50% 1.70% 1.50%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 7.25% 7.25% 7.25% 7.25%  
Investment Interest Rate 11.71% 12.71% 11.71% 12.71%  
Investment, Acquisition Date Oct. 16, 2019 Oct. 16, 2019      
Investment Maturity Date Dec. 31, 2025 Sep. 25, 2024 Dec. 31, 2025 Sep. 25, 2024  
Investment Owned, Balance, Principal Amount $ 5,020 $ 5,090      
Investment Owned, at Cost 5,020 5,089      
Investment Owned, at Fair Value $ 5,020 $ 5,090      
Percent of net assets 1.80% 1.60% 1.80% 1.60%  
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:LabLogisticsLLCMember        
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 Services   Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 7.25%   7.25%    
Investment Interest Rate 11.71%   11.71%    
Investment, Acquisition Date Sep. 17, 2024        
Investment Maturity Date Dec. 31, 2025   Dec. 31, 2025    
Investment Owned, Balance, Principal Amount $ 437        
Investment Owned, at Cost 437        
Investment Owned, at Fair Value $ 437        
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 7.25% 7.25% 7.25% 7.25%  
Investment Interest Rate 11.71% 12.71% 11.71% 12.71%  
Investment, Acquisition Date Oct. 16, 2019 Oct. 16, 2019      
Investment Maturity Date Dec. 31, 2025 Sep. 25, 2024 Dec. 31, 2025 Sep. 25, 2024  
Investment Owned, Balance, Principal Amount $ 5,383 $ 5,449      
Investment Owned, at Cost 5,381 5,442      
Investment Owned, at Fair Value $ 5,383 $ 5,449      
Percent of net assets 1.90% 1.70% 1.90% 1.70%  
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  
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, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 7.50% 7.50% 7.50% 7.50%  
Investment Interest Rate 11.98% 13.00% 11.98% 13.00%  
Investment, Acquisition Date Dec. 27, 2022 Dec. 27, 2022      
Investment Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027  
Investment Owned, at Fair Value $ 10 $ 14      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [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, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.50% 1.50% 1.50% 1.50%  
Spread Above Index 7.50% 7.50% 7.50% 7.50%  
Investment Interest Rate 11.98% 13.00% 11.98% 13.00%  
Investment, Acquisition Date Dec. 27, 2022 Dec. 27, 2022      
Investment Maturity Date Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027 Dec. 27, 2027  
Investment Owned, Balance, Principal Amount $ 13,211 $ 10,346      
Investment Owned, at Cost 12,981 10,098      
Investment Owned, at Fair Value $ 13,312 $ 10,346      
Percent of net assets 4.60% 3.30% 4.60% 3.30%  
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  
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 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.50% 7.50% 7.50% 7.50%  
Investment Interest Rate 11.96% 12.96% 11.96% 12.96%  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020      
Investment Maturity Date Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025 Jun. 29, 2025  
Investment Owned, Balance, Principal Amount $ 5,461 $ 5,518      
Investment Owned, at Cost 5,453 5,492      
Investment Owned, at Fair Value $ 5,461 $ 5,457      
Percent of net assets 1.90% 1.70% 1.90% 1.70%  
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  
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 Interest Rate 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  
Investment Owned, Balance, Principal Amount $ 1,594 $ 1,450      
Investment Owned, at Cost 1,592 1,441      
Investment Owned, at Fair Value $ 1,594 $ 1,406      
Investment, Interest Rate, Paid in Kind   9.50%   9.50%  
Percent of net assets 0.60% 0.40% 0.60% 0.40%  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
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 Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] LogicMonitor, Inc. [Member]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
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]: 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail  
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% 6.50% 5.75% 6.50%  
Investment Interest Rate 10.11% 11.96% 10.11% 11.96%  
Investment, Acquisition Date Dec. 04, 2020 Dec. 04, 2020      
Investment Maturity Date Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026 Jun. 04, 2026  
Investment Owned, Balance, Principal Amount $ 4,580 $ 5,280      
Investment Owned, at Cost 4,556 5,233      
Investment Owned, at Fair Value $ 4,580 $ 5,280      
Percent of net assets 1.60% 1.70% 1.60% 1.70%  
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper Products   Paper Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member]   Base Rate [Member]    
Investment, Interest Rate, Floor 0.50%   0.50%    
Spread Above Index 4.73%   4.73%    
Investment Interest Rate 9.10%   9.10%    
Investment, Acquisition Date Aug. 22, 2024        
Investment Maturity Date Aug. 25, 2031   Aug. 25, 2031    
Investment Owned, Balance, Principal Amount $ 9,770        
Investment Owned, at Cost 9,119        
Investment Owned, at Fair Value $ 9,453        
Percent of net assets 3.30%   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:MbsHighwayLlcMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software  
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 8.50% 7.50% 8.50% 7.50%  
Investment Interest Rate 13.20% 13.18% 13.20% 13.18%  
Investment, Acquisition Date Oct. 13, 2022 Oct. 13, 2022      
Investment Maturity Date Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027 Oct. 13, 2027  
Investment Owned, Balance, Principal Amount $ 9,286 $ 9,381      
Investment Owned, at Cost 9,157 9,204      
Investment Owned, at Fair Value $ 9,212 $ 9,089      
Investment, Interest Rate, Paid in Kind 0.50%   0.50%    
Investment, Interest Rate, Paid in Cash 12.70%   12.70%    
Percent of net assets 3.20% 2.90% 3.20% 2.90%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 5.97% 6.50% 5.97% 6.50%  
Investment Interest Rate 10.51% 11.98% 10.51% 11.98%  
Investment, Acquisition Date May 10, 2023 May 10, 2023      
Investment Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 821 $ 392      
Investment Owned, at Cost 804 378      
Investment Owned, at Fair Value $ 817 $ 389      
Fair Value As A Percentage of Member's Equity 2.40% 1.10%      
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] us-gaap:PrimeRateMember 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 5.50% 6.50% 5.50% 6.50%  
Investment Interest Rate 13.00% 11.98% 13.00% 11.98%  
Investment, Acquisition Date May 10, 2023 May 10, 2023      
Investment Maturity Date Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028 Apr. 10, 2028  
Investment Owned, Balance, Principal Amount $ 241        
Investment Owned, at Cost 236        
Investment Owned, at Fair Value $ 249 $ 11      
Fair Value As A Percentage of Member's Equity 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 6.39% 6.50% 6.39% 6.50%  
Investment Interest Rate 10.85% 11.98% 10.85% 11.98%  
Investment, Acquisition Date May 10, 2023 May 10, 2023      
Investment Maturity Date Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029 Apr. 10, 2029  
Investment Owned, Balance, Principal Amount $ 7,187 $ 6,247      
Investment Owned, at Cost 7,040 6,084      
Investment Owned, at Fair Value $ 7,176 $ 6,194      
Fair Value As A Percentage of Member's Equity 20.70% 17.90%      
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Education Services [Member]   Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]   Base Rate [Member]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.84%   6.84%  
Investment Interest Rate   15.06%   15.06%  
Investment, Acquisition Date   Apr. 25, 2022      
Investment Maturity Date   Apr. 24, 2026   Apr. 24, 2026  
Investment Owned, Balance, Principal Amount   $ 825      
Investment Owned, at Cost   815      
Investment Owned, at Fair Value   $ 776      
Percent of net assets   0.20%   0.20%  
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MSIInformationServicesIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Education Services [Member]   Education Services [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.75%   7.75%  
Investment Interest Rate   13.29%   13.29%  
Investment, Acquisition Date   Apr. 25, 2022      
Investment Maturity Date   Apr. 24, 2026   Apr. 24, 2026  
Investment Owned, Balance, Principal Amount   $ 7,333      
Investment Owned, at Cost   7,248      
Investment Owned, at Fair Value   $ 6,972      
Percent of net assets   2.20%   2.20%  
Investment, Identifier [Axis]: MSI Information Services, Inc. First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MSIInformationServicesIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member]   Education Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member]   Base Rate [Member]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.82%   8.82%    
Investment Interest Rate 15.24%   15.24%    
Investment, Acquisition Date Apr. 25, 2022        
Investment Maturity Date Apr. 24, 2026   Apr. 24, 2026    
Investment Owned, Balance, Principal Amount $ 1,050        
Investment Owned, at Cost 1,043        
Investment Owned, at Fair Value $ 945        
Percent of net assets 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Education Services [Member]   Education Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 9.75%   9.75%    
Investment Interest Rate 14.23%   14.23%    
Investment, Acquisition Date Apr. 25, 2022        
Investment Maturity Date Apr. 24, 2026   Apr. 24, 2026    
Investment Owned, Balance, Principal Amount $ 8,746        
Investment Owned, at Cost 8,552        
Investment Owned, at Fair Value $ 7,871        
Percent of net assets 2.80%   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: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] 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:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 8.00% 8.00% 8.00% 8.00%  
Investment Interest Rate 12.43% 13.45% 12.43% 13.45%  
Investment, Acquisition Date Apr. 07, 2023 Apr. 07, 2023      
Investment Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029  
Investment Owned, at Fair Value $ 5 $ (1)      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 8.00% 8.00% 8.00% 8.00%  
Investment Interest Rate 12.43% 13.45% 12.43% 13.45%  
Investment, Acquisition Date Apr. 07, 2023 Apr. 07, 2023      
Investment Maturity Date Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029 Apr. 09, 2029  
Investment Owned, Balance, Principal Amount $ 4,927 $ 4,726      
Investment Owned, at Cost 4,823 4,602      
Investment Owned, at Fair Value $ 4,922 $ 4,580      
Percent of net assets 1.70% 1.40% 1.70% 1.40%  
Investment, Identifier [Axis]: Manchester Acquisition Sub LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ManchesterAcquisitionSubLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Diversified Chemicals [Member]   Diversified Chemicals [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   0.75%   0.75%  
Spread Above Index   5.75%   5.75%  
Investment Interest Rate   11.28%   11.28%  
Investment, Acquisition Date   Nov. 16, 2021      
Investment Maturity Date   Dec. 01, 2026   Dec. 01, 2026  
Investment Owned, Balance, Principal Amount   $ 7,840      
Investment Owned, at Cost   7,587      
Investment Owned, at Fair Value   $ 7,215      
Percent of net assets   2.30%   2.30%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] 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]  
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 11.03% 11.99% 11.03% 11.99%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019      
Investment Maturity Date Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025 Jul. 01, 2025  
Investment Owned, at Fair Value $ (38) $ (3)      
Fair Value As A Percentage of Member's Equity (0.10%)        
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MarlinDTC-LSMidco2LLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.99%   11.99%  
Investment, Acquisition Date   Jul. 19, 2019      
Investment Maturity Date   Jul. 01, 2025   Jul. 01, 2025  
Investment Owned, Balance, Principal Amount   $ 18,908      
Investment Owned, at Cost   18,798      
Investment Owned, at Fair Value   $ 18,762      
Fair Value As A Percentage of Member's Equity   54.10%      
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 11.03%   11.03%    
Investment, Acquisition Date Jul. 19, 2019        
Investment Maturity Date Jul. 01, 2025   Jul. 01, 2025    
Investment Owned, Balance, Principal Amount $ 18,613        
Investment Owned, at Cost 18,577        
Investment Owned, at Fair Value $ 17,865        
Fair Value As A Percentage of Member's Equity 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]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Acquisition Date Sep. 29, 2022 Sep. 29, 2022      
Investment Owned, Balance, Shares | shares 4 4 4 4  
Investment Owned, at Cost $ 400 $ 400      
Investment Owned, at Fair Value   $ 179      
Percent of net assets   0.10%   0.10%  
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.66%   7.66%  
Investment Interest Rate   13.15%   13.15%  
Investment, Acquisition Date   Oct. 07, 2022      
Investment Maturity Date   Sep. 29, 2028   Sep. 29, 2028  
Investment Owned, at Fair Value   $ (17)      
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Paper & Plastic Packaging Products & Materials   Paper & Plastic Packaging Products & Materials  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:CanadianDollarOfferedRateMember   whfcl:CanadianDollarOfferedRateMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.66%   7.66%  
Investment Interest Rate   13.15%   13.15%  
Investment, Acquisition Date   Oct. 07, 2022      
Investment Maturity Date   Sep. 29, 2028   Sep. 29, 2028  
Investment, Identifier [Axis]: Max Solutions, Inc. First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MaxSolutionsIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.66%   7.66%  
Investment Interest Rate   13.15%   13.15%  
Investment, Acquisition Date   Oct. 07, 2022      
Investment Maturity Date   Sep. 29, 2028   Sep. 29, 2028  
Investment Owned, Balance, Principal Amount   $ 6,589      
Investment Owned, at Cost   6,485      
Investment Owned, at Fair Value   $ 6,488      
Fair Value As A Percentage of Member's Equity   18.70%      
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.10%   8.10%    
Investment Interest Rate 12.56%   12.56%    
Investment, Acquisition Date Oct. 07, 2022        
Investment Maturity Date Sep. 29, 2028   Sep. 29, 2028    
Investment Owned, Balance, Principal Amount $ 414        
Investment Owned, at Cost 411        
Investment Owned, at Fair Value $ 402        
Fair Value As A Percentage of Member's Equity 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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Paper & Plastic Packaging Products & Materials   Paper & Plastic Packaging Products & Materials    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianOvernightRepoRateAverageMember   whfcl:CanadianOvernightRepoRateAverageMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.10%   8.10%    
Investment Interest Rate 12.56%   12.56%    
Investment, Acquisition Date Oct. 07, 2022        
Investment Maturity Date Sep. 29, 2028   Sep. 29, 2028    
Investment Owned, at Fair Value $ (3)        
Investment, Identifier [Axis]: Max Solutions, Inc., First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxSolutionsIncMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.11%   8.11%    
Investment Interest Rate 12.57%   12.57%    
Investment, Acquisition Date Oct. 07, 2022        
Investment Maturity Date Sep. 29, 2028   Sep. 29, 2028    
Investment Owned, Balance, Principal Amount $ 6,521        
Investment Owned, at Cost 6,439        
Investment Owned, at Fair Value $ 6,324        
Fair Value As A Percentage of Member's Equity 18.30%        
Investment, Identifier [Axis]: Maxor Acquisition, Inc. (d/b/a Maxor National Pharmacy Services, LLC) First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MaxorAcquisitionInc.Member        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services   Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.46%   10.46%    
Investment, Acquisition Date Dec. 27, 2024        
Investment Maturity Date Mar. 01, 2029   Mar. 01, 2029    
Investment Owned, Balance, Principal Amount $ 947        
Investment Owned, at Cost 938        
Investment Owned, at Fair Value $ 938        
Percent of net assets 0.30%   0.30%    
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 6.00% 6.75% 6.00% 6.75%  
Investment Interest Rate 10.46% 12.48% 10.46% 12.48%  
Investment, Acquisition Date Apr. 11, 2023 Apr. 11, 2023      
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Investment Owned, at Fair Value $ 9 $ 9      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 6.00% 6.75% 6.00% 6.75%  
Investment Interest Rate 10.46% 12.48% 10.46% 12.48%  
Investment, Acquisition Date Apr. 11, 2023 Apr. 11, 2023      
Investment Maturity Date Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029 Mar. 01, 2029  
Investment Owned, Balance, Principal Amount $ 5,002 $ 5,053      
Investment Owned, at Cost 4,898 4,922      
Investment Owned, at Fair Value $ 4,986 $ 5,013      
Fair Value As A Percentage of Member's Equity 14.40% 14.50%      
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MedicalDeviceIncMember whfcl:MedicalDeviceIncMember      
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 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]  
Investment, Interest Rate, Floor 1.25% 1.00% 1.25% 1.00%  
Spread Above Index 6.25% 6.50% 6.25% 6.50%  
Investment Interest Rate 10.68% 11.95% 10.68% 11.95%  
Investment, Acquisition Date Jul. 27, 2023 Jul. 27, 2023      
Investment Maturity Date Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029  
Investment Owned, at Fair Value $ 6 $ 3      
Investment, Identifier [Axis]: Medical Device Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MedicalDeviceIncMember whfcl:MedicalDeviceIncMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 1.25% 1.00% 1.25% 1.00%  
Spread Above Index 6.25% 6.50% 6.25% 6.50%  
Investment Interest Rate 10.68% 11.95% 10.68% 11.95%  
Investment, Acquisition Date Jul. 27, 2023 Jul. 27, 2023      
Investment Maturity Date Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029 Jul. 11, 2029  
Investment Owned, Balance, Principal Amount $ 2,633 $ 2,660      
Investment Owned, at Cost 2,584 2,599      
Investment Owned, at Fair Value $ 2,660 $ 2,626      
Fair Value As A Percentage of Member's Equity 7.70% 7.60%      
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Acquisition Date Apr. 07, 2023 Apr. 07, 2023      
Investment Owned, Balance, Shares | shares 327 327 327 327  
Investment Owned, at Cost $ 333 $ 333      
Investment Owned, at Fair Value $ 368 $ 295      
Percent of net assets 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      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   11.56%   11.56%  
Investment, Acquisition Date   Dec. 16, 2021      
Investment Maturity Date   Nov. 01, 2027   Nov. 01, 2027  
Investment Owned, Balance, Principal Amount   $ 883      
Investment Owned, at Cost   871      
Investment Owned, at Fair Value   $ 883      
Fair Value As A Percentage of Member's Equity   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      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   11.53%   11.53%  
Investment, Acquisition Date   Dec. 16, 2021      
Investment Maturity Date   Nov. 01, 2027   Nov. 01, 2027  
Investment Owned, Balance, Principal Amount   $ 1,156      
Investment Owned, at Cost   1,141      
Investment Owned, at Fair Value   $ 1,161      
Fair Value As A Percentage of Member's Equity   3.30%      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan One          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Pharmaceuticals   Pharmaceuticals  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   9.87%   9.87%  
Investment, Acquisition Date   Dec. 16, 2021      
Investment Maturity Date   Nov. 01, 2027   Nov. 01, 2027  
Investment Owned, Balance, Principal Amount   $ 12,163      
Investment Owned, at Cost   13,552      
Investment Owned, at Fair Value   $ 13,401      
Fair Value As A Percentage of Member's Equity   38.70%      
Investment, Identifier [Axis]: Meta Buyer LLC First Lien Secured Term Loan Two          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:MetaBuyerLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   11.46%   11.46%  
Investment, Acquisition Date   Dec. 16, 2021      
Investment Maturity Date   Nov. 01, 2027   Nov. 01, 2027  
Investment Owned, Balance, Principal Amount   $ 971      
Investment Owned, at Cost   959      
Investment Owned, at Fair Value   $ 971      
Fair Value As A Percentage of Member's Equity   2.80%      
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.51%   10.51%    
Investment, Acquisition Date Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027   Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 874        
Investment Owned, at Cost 865        
Investment Owned, at Fair Value $ 874        
Fair Value As A Percentage of Member's Equity 2.50%        
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Pharmaceuticals   Pharmaceuticals    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 8.85%   8.85%    
Investment, Acquisition Date Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027   Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 12,039        
Investment Owned, at Cost 13,449        
Investment Owned, at Fair Value $ 12,465        
Fair Value As A Percentage of Member's Equity 36.00%        
Investment, Identifier [Axis]: Meta Buyer LLC., First Lien Secured Term Loan One          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.48%   10.48%    
Investment, Acquisition Date Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027   Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 962        
Investment Owned, at Cost 952        
Investment Owned, at Fair Value $ 962        
Fair Value As A Percentage of Member's Equity 2.80%        
Investment, Identifier [Axis]: Meta Buyer LLC.,First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:MetaBuyerLLCMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.44%   10.44%    
Investment, Acquisition Date Dec. 16, 2021        
Investment Maturity Date Nov. 01, 2027   Nov. 01, 2027    
Investment Owned, Balance, Principal Amount $ 1,156        
Investment Owned, at Cost 1,145        
Investment Owned, at Fair Value $ 1,160        
Fair Value As A Percentage of Member's Equity 3.40%        
Investment, Identifier [Axis]: Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC) First Lien Secured Bridge Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   Midwest Texas Tea CA, LLC [Member]      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredBridgeLoanMember   whfcl:FirstLienSecuredBridgeLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Distributors   Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   14.00%   14.00%  
Investment Interest Rate   19.46%   19.46%  
Investment, Acquisition Date   Dec. 22, 2023      
Investment Maturity Date   Dec. 22, 2025   Dec. 22, 2025  
Investment Owned, Balance, Principal Amount   $ 1,464      
Investment Owned, at Cost   1,420      
Investment Owned, at Fair Value   $ 1,420      
Investment, Interest Rate, Paid in Kind   6.00%   6.00%  
Investment, Interest Rate, Paid in Cash   13.46%   13.46%  
Percent of net assets   0.40%   0.40%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors  
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 7.25% 7.25% 7.25% 7.25%  
Investment Interest Rate 11.71% 12.71% 11.71% 12.71%  
Investment, Acquisition Date Dec. 22, 2023 Dec. 22, 2023      
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Investment Owned, Balance, Principal Amount $ 645        
Investment Owned, at Cost 632        
Investment Owned, at Fair Value $ 642        
Percent of net assets 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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors  
Investment, Variable Interest Rate, Type [Extensible Enumeration] Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Base Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.92% 7.25% 6.92% 7.25%  
Investment Interest Rate 12.39% 12.71% 12.39% 12.71%  
Investment, Acquisition Date Dec. 22, 2023 Dec. 22, 2023      
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Investment Owned, Balance, Principal Amount $ 326        
Investment Owned, at Cost 319        
Investment Owned, at Fair Value $ 328        
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Distributors Distributors Distributors Distributors  
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 7.25% 7.25% 7.25% 7.25%  
Investment Interest Rate 11.71% 12.71% 11.71% 12.71%  
Investment, Acquisition Date Dec. 22, 2023 Dec. 22, 2023      
Investment Maturity Date Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028 Dec. 22, 2028  
Investment Owned, Balance, Principal Amount $ 9,443 $ 9,490      
Investment Owned, at Cost 9,255 9,254      
Investment Owned, at Fair Value $ 9,399 $ 9,254      
Percent of net assets 3.30% 2.90% 3.30% 2.90%  
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.50%   1.50%    
Spread Above Index 6.75%   6.75%    
Investment Interest Rate 11.16%   11.16%    
Investment, Acquisition Date Jan. 10, 2024        
Investment Maturity Date Jan. 10, 2029   Jan. 10, 2029    
Investment Owned, Balance, Principal Amount $ 1,596        
Investment Owned, at Cost 1,572        
Investment Owned, at Fair Value $ 1,582        
Percent of net assets 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.50%   1.50%    
Spread Above Index 6.75%   6.75%    
Investment Interest Rate 11.08%   11.08%    
Investment, Acquisition Date Jan. 10, 2024        
Investment Maturity Date Jan. 10, 2029   Jan. 10, 2029    
Investment Owned, Balance, Principal Amount $ 9,306        
Investment Owned, at Cost 9,119        
Investment Owned, at Fair Value $ 9,223        
Percent of net assets 3.20%   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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Acquisition Date Jul. 12, 2021 Jul. 12, 2021      
Investment Owned, Balance, Shares | shares 1,250 1,250 1,250 1,250  
Investment Owned, at Cost $ 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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 8.50% 7.25% 8.50% 7.25%  
Investment Interest Rate 13.00% 12.71% 13.00% 12.71%  
Investment, Acquisition Date Jul. 12, 2021 Jul. 12, 2021      
Investment Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026  
Investment Owned, Balance, Principal Amount $ 1,182 $ 473      
Investment Owned, at Cost 1,175 468      
Investment Owned, at Fair Value $ 1,061 $ 338      
Investment, Interest Rate, Paid in Kind 2.00% 0.75% 2.00% 0.75%  
Investment, Interest Rate, Paid in Cash 11.00% 11.96% 11.00% 11.96%  
Percent of net assets 0.40% 0.10% 0.40% 0.10%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 8.50% 7.25% 8.50% 7.25%  
Investment Interest Rate 12.96% 12.71% 12.96% 12.71%  
Investment, Acquisition Date Jul. 12, 2021 Jul. 12, 2021      
Investment Maturity Date Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026 Jul. 12, 2026  
Investment Owned, Balance, Principal Amount $ 10,510 $ 9,989      
Investment Owned, at Cost 10,449 9,888      
Investment Owned, at Fair Value $ 9,438 $ 8,790      
Investment, Interest Rate, Paid in Kind 7.48% 0.75% 7.48% 0.75%  
Investment, Interest Rate, Paid in Cash 5.48% 11.96% 5.48% 11.96%  
Percent of net assets 3.20% 2.80% 3.20% 2.80%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 7.25% 6.75% 7.25% 6.75%  
Investment Interest Rate 11.73% 12.25% 11.73% 12.25%  
Investment, Acquisition Date Aug. 27, 2021 Aug. 27, 2021      
Investment Maturity Date Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026 Aug. 27, 2026  
Investment Owned, Balance, Principal Amount $ 9,125 $ 9,417      
Investment Owned, at Cost 9,087 9,354      
Investment Owned, at Fair Value $ 8,941 $ 9,293      
Percent of net assets 3.10% 2.90% 3.10% 2.90%  
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:NPAVLessorCorp.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] 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]  
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 10.96% 11.96% 10.96% 11.96%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022      
Investment Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027  
Investment Owned, Balance, Principal Amount $ 725 $ 725      
Investment Owned, at Cost 719 716      
Investment Owned, at Fair Value $ 660 $ 647      
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:NPAVLessorCorp.Member      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.50% 6.50% 6.50% 6.50%  
Investment Interest Rate 10.96% 11.96% 10.96% 11.96%  
Investment, Acquisition Date Mar. 01, 2022 Mar. 01, 2022      
Investment Maturity Date Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027 Jan. 21, 2027  
Investment Owned, Balance, Principal Amount $ 6,502 $ 7,510      
Investment Owned, at Cost 6,448 7,418      
Investment Owned, at Fair Value $ 5,918 $ 6,706      
Fair Value As A Percentage of Member's Equity 17.10% 19.30%      
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  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] 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]  
Investment, Interest Rate, Floor 1.00% 1.00% 1.00% 1.00%  
Spread Above Index 6.84% 6.84% 6.84% 6.84%  
Investment Interest Rate 12.78% 12.78% 12.78% 12.78%  
Investment, Acquisition Date Jun. 14, 2019 Jun. 14, 2019      
Investment Maturity Date Jun. 28, 2024 Feb. 27, 2024 Jun. 28, 2024 Feb. 27, 2024  
Investment Owned, Balance, Principal Amount $ 301 $ 271      
Investment Owned, at Cost 301 271      
Investment Owned, at Fair Value $ 169 $ 268      
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software  
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 7.00% 7.00% 7.00% 7.00%  
Investment Interest Rate 12.40% 12.45% 12.40% 12.45%  
Investment, Acquisition Date Jun. 14, 2019 Jun. 14, 2019      
Investment Maturity Date Jun. 28, 2024 Feb. 27, 2024 Jun. 28, 2024 Feb. 27, 2024  
Investment Owned, Balance, Principal Amount $ 3,140 $ 3,148      
Investment Owned, at Cost 3,140 3,148      
Investment Owned, at Fair Value $ 1,763 $ 3,113      
Percent of net assets 0.60% 1.00% 0.60% 1.00%  
Investment, Identifier [Axis]: New American Crafts Holdings, LLC Class A Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:NewAmericanCraftsHoldingsLlcMember whfcl:NewAmericanCraftsHoldingsLlcClassaUnitsMember      
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] Leisure Products Leisure Products Leisure Products Leisure Products  
Investment, Acquisition Date Mar. 16, 2023 Mar. 16, 2023      
Investment Owned, Balance, Shares | shares 1 1 1 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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats   Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.15%   10.15%    
Investment, Acquisition Date May 14, 2024        
Investment Maturity Date May 14, 2029   May 14, 2029    
Investment Owned, Balance, Principal Amount $ 27        
Investment Owned, at Cost 27        
Investment Owned, at Fair Value $ 33        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Revolving Loan, One 05/14/29          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
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    
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 5.75%   5.75%    
Investment Interest Rate 10.15%   10.15%    
Investment, Acquisition Date Jun. 14, 2024        
Investment Maturity Date May 14, 2029   May 14, 2029    
Investment Owned, Balance, Principal Amount $ 30        
Investment Owned, at Cost 30        
Investment Owned, at Fair Value $ 36        
Fair Value As A Percentage of Member's Equity 0.10%        
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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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    
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 5.75%   5.75%    
Investment Interest Rate 10.13%   10.13%    
Investment, Acquisition Date Jun. 14, 2024        
Investment Maturity Date May 14, 2029   May 14, 2029    
Investment Owned, Balance, Principal Amount $ 4,520        
Investment Owned, at Cost 4,441        
Investment Owned, at Fair Value $ 4,505        
Fair Value As A Percentage of Member's Equity 13.00%        
Investment, Identifier [Axis]: PANOS Brands, LLC First Lien Secured Term Loan, One 05/14/29          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Panos Brands, Llc [Member]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Packaged Foods & Meats   Packaged Foods & Meats    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.13%   10.13%    
Investment, Acquisition Date May 14, 2024        
Investment Maturity Date May 14, 2029   May 14, 2029    
Investment Owned, Balance, Principal Amount $ 4,068        
Investment Owned, at Cost 3,997        
Investment Owned, at Fair Value $ 4,054        
Percent of net assets 1.40%   1.40%    
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PfbHoldingCompanyLlcMember      
Investment, Type [Extensible Enumeration]   whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Building Products   Building Products  
Investment, Acquisition Date   Dec. 17, 2021      
Investment Owned, Balance, Shares | shares   1   1  
Investment Owned, at Cost   $ 423      
Investment Owned, at Fair Value   $ 1,053      
Percent of net assets   0.30%   0.30%  
Investment, Identifier [Axis]: PFB Holding Company, LLC Class A Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:PFBHoldcoIncMember        
Investment, Type [Extensible Enumeration] whfcl:ClassAUnitsMember   whfcl:ClassAUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Building Products   Building Products    
Investment, Acquisition Date Dec. 17, 2021        
Investment Owned, Balance, Shares | shares 1   1    
Investment Owned, at Cost $ 24        
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PGDentalNewJerseyParentLLCMember      
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 Services   Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]   Base Rate [Member]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.00%   7.00%  
Investment Interest Rate   13.98%   13.98%  
Investment, Acquisition Date   Nov. 25, 2020      
Investment Maturity Date   Nov. 25, 2025   Nov. 25, 2025  
Investment Owned, Balance, Principal Amount   $ 704      
Investment Owned, at Cost   698      
Investment Owned, at Fair Value   $ 704      
Investment, Interest Rate, Paid in Kind   2.25%   2.25%  
Investment, Interest Rate, Paid in Cash   11.73%   11.73%  
Percent of net assets   0.20%   0.20%  
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PGDentalNewJerseyParentLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Health Care Services   Health Care Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   12.96%   12.96%  
Investment, Acquisition Date   Nov. 25, 2020      
Investment Maturity Date   Nov. 25, 2025   Nov. 25, 2025  
Investment Owned, Balance, Principal Amount   $ 6,400      
Investment Owned, at Cost   6,348      
Investment Owned, at Fair Value   $ 6,400      
Investment, Interest Rate, Paid in Kind   2.25%   2.25%  
Investment, Interest Rate, Paid in Cash   10.71%   10.71%  
Percent of net assets   2.00%   2.00%  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
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] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
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 Holdco LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:PatagoniaHoldcoLLCMember whfcl:PatagoniaHoldcoLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 0.50% 0.50% 0.50% 0.50%  
Spread Above Index 5.75% 5.75% 5.75% 5.75%  
Investment Interest Rate 10.27% 11.12% 10.27% 11.12%  
Investment, Acquisition Date Aug. 05, 2022 Aug. 05, 2022      
Investment Maturity Date Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029 Aug. 01, 2029  
Investment Owned, Balance, Principal Amount $ 14,296 $ 14,442      
Investment Owned, at Cost 12,602 12,357      
Investment Owned, at Fair Value $ 13,135 $ 13,191      
Percent of net assets 4.60% 4.20% 4.60% 4.20%  
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.42% 11.23% 12.42%  
Investment, Acquisition Date Mar. 17, 2023 Mar. 17, 2023      
Investment Maturity Date Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028  
Investment Owned, Balance, Principal Amount $ 569 $ 575      
Investment Owned, at Cost 558 560      
Investment Owned, at Fair Value $ 569 $ 569      
Fair Value As A Percentage of Member's Equity 1.70% 1.60%      
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.42% 11.23% 12.42%  
Investment, Acquisition Date Mar. 17, 2023 Mar. 17, 2023      
Investment Maturity Date Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028  
Investment Owned, Balance, Principal Amount $ 338        
Investment Owned, at Cost 331        
Investment Owned, at Fair Value $ 341 $ 5      
Fair Value As A Percentage of Member's Equity 1.00%        
Investment, Identifier [Axis]: Pavement Partners Interco, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:PavementPartnersIntercoLLCMember whfcl:PavementPartnersIntercoLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.27% 11.23% 12.27%  
Investment, Acquisition Date Mar. 17, 2023 Mar. 17, 2023      
Investment Maturity Date Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028 Feb. 07, 2028  
Investment Owned, Balance, Principal Amount $ 5,117 $ 4,455      
Investment Owned, at Cost 5,015 4,344      
Investment Owned, at Fair Value $ 5,111 $ 4,405      
Fair Value As A Percentage of Member's Equity 14.80% 12.70%      
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PennsylvaniaMachineWorksLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
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   6.00%   6.00%  
Investment Interest Rate   11.61%   11.61%  
Investment, Acquisition Date   Mar. 25, 2022      
Investment Maturity Date   Mar. 08, 2027   Mar. 08, 2027  
Investment Owned, Balance, Principal Amount   $ 6,561      
Investment Owned, at Cost   6,498      
Investment Owned, at Fair Value   $ 6,561      
Fair Value As A Percentage of Member's Equity   18.90%      
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  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 5.50% 5.75% 5.50% 5.75%  
Investment Interest Rate 9.95% 11.20% 9.95% 11.20%  
Investment, Acquisition Date Oct. 31, 2023 Oct. 31, 2023      
Investment Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028  
Investment Owned, at Fair Value $ 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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 5.50% 5.75% 5.50% 5.75%  
Investment Interest Rate 9.95% 11.20% 9.95% 11.20%  
Investment, Acquisition Date Oct. 31, 2023 Oct. 31, 2023      
Investment Maturity Date Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028 Oct. 26, 2028  
Investment Owned, Balance, Principal Amount $ 7,425 $ 7,500      
Investment Owned, at Cost 7,298 7,337      
Investment Owned, at Fair Value $ 7,425 $ 7,337      
Fair Value As A Percentage of Member's Equity 21.50% 21.20%      
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PlaymonsterGroupLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment Owned, at Fair Value   $ 1,363     2,977
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock          
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]  
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 Jan. 24, 2022      
Investment Owned, Balance, Shares | shares 72 72 72 72  
Investment Owned, at Cost $ 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  
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 Interest Rate 14.00% 14.00% 14.00% 14.00%  
Investment, Acquisition Date Jan. 24, 2022 Jan. 24, 2022      
Investment Owned, Balance, Shares | shares 36 36 36 36  
Investment Owned, at Cost $ 3,600 $ 3,600      
Investment, Interest Rate, Paid in Kind 14.00% 14.00% 14.00% 14.00%  
Investment, Identifier [Axis]: Playmonster Group LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:PlaymonsterGroupLLCMember whfcl:PlayMonsterLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [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, 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 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  
Investment Owned, Balance, Principal Amount $ 4,890 $ 4,232      
Investment Owned, at Cost 3,661 3,661      
Investment Owned, at Fair Value $ 1,635 $ 1,363      
Investment, Interest Rate, Paid in Kind 13.74% 14.53% 13.74% 14.53%  
Percent of net assets 0.60% 0.40% 0.60% 0.40%  
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:PlayMonsterLLCMember      
Investment, Type [Extensible Enumeration] whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember whfcl:PriorityFirstLienSecuredTermLoanMember  
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, 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 6.75% 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  
Investment Owned, Balance, Principal Amount $ 1,289 $ 1,140      
Investment Owned, at Cost 1,275 1,118      
Investment Owned, at Fair Value $ 1,172 $ 1,015     176
Investment, Interest Rate, Paid in Kind 11.41% 12.37% 11.41% 12.37%  
Percent of net assets 0.40% 0.30% 0.40% 0.30%  
Investment, Identifier [Axis]: Potpourri Group, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PotpourriGroupIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Broadline Retail   Broadline Retail  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.50%   1.50%  
Spread Above Index   8.25%   8.25%  
Investment Interest Rate   13.71%   13.71%  
Investment, Acquisition Date   Jul. 03, 2019      
Investment Maturity Date   Jul. 03, 2024   Jul. 03, 2024  
Investment Owned, Balance, Principal Amount   $ 13,799      
Investment Owned, at Cost   13,767      
Investment Owned, at Fair Value   $ 13,799      
Percent of net assets   4.40%   4.40%  
Investment, Identifier [Axis]: Poultry Holdings LLC., First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:PoultryHoldingsLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment, Acquisition Date   Oct. 21, 2019      
Investment Maturity Date   Jun. 28, 2025   Jun. 28, 2025  
Investment Owned, Balance, Principal Amount   $ 6,939      
Investment Owned, at Cost   6,904      
Investment Owned, at Fair Value   $ 6,904      
Fair Value As A Percentage of Member's Equity   19.90%      
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.25% 11.23% 12.25%  
Investment, Acquisition Date Jul. 11, 2022 Jul. 11, 2022      
Investment Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026  
Investment Owned, Balance, Principal Amount $ 1,340 $ 1,356      
Investment Owned, at Cost 1,329 1,336      
Investment Owned, at Fair Value $ 1,354 $ 1,353      
Percent of net assets 0.50% 0.40% 0.50% 0.40%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 6.75% 6.75% 6.75% 6.75%  
Investment Interest Rate 11.23% 12.25% 11.23% 12.25%  
Investment, Acquisition Date Jun. 25, 2021 Jun. 25, 2021      
Investment Maturity Date Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026 Jun. 25, 2026  
Investment Owned, Balance, Principal Amount $ 8,697 $ 8,804      
Investment Owned, at Cost 8,642 8,712      
Investment Owned, at Fair Value $ 8,784 $ 8,782      
Percent of net assets 3.10% 2.80% 3.10% 2.80%  
Investment, Identifier [Axis]: Pressurized Holdings, LLC Common Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] Pressurized Holdings, LLC [Member] Pressurized Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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] Pressurized Holdings, LLC [Member] Pressurized Holdings, LLC [Member]      
Investment, Type [Extensible Enumeration] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
Investment Interest Rate 14.00%   14.00%    
Investment, Acquisition Date Mar. 16, 2023 Mar. 16, 2023      
Investment Owned, at Cost $ 4,537 $ 4,537      
Investment Owned, at Fair Value $ 1,657 $ 251      
Investment, Interest Rate, Paid in Kind 14.00% 14.00% 14.00% 14.00%  
Percent of net assets 0.60% 0.10% 0.60% 0.10%  
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] Electronic Equipment & Instruments   Electronic Equipment & Instruments    
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Electronic Equipment & Instruments   Electronic Equipment & Instruments    
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 Owned, Balance, Principal Amount $ 3,531        
Investment Owned, at Cost 3,479        
Investment Owned, at Fair Value $ 3,479        
Fair Value As A Percentage of Member's Equity 10.10%        
Investment, Identifier [Axis]: Project Castle, Inc First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:ProjectCastleIncMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   0.50%   0.50%  
Spread Above Index   5.50%   5.50%  
Investment Interest Rate   10.89%   10.89%  
Investment, Acquisition Date   Jun. 09, 2022      
Investment Maturity Date   Jun. 01, 2029   Jun. 01, 2029  
Investment Owned, Balance, Principal Amount   $ 6,027      
Investment Owned, at Cost   5,536      
Investment Owned, at Fair Value   $ 5,364      
Percent of net assets   1.70%   1.70%  
Investment, Identifier [Axis]: Quest Events LLC, First Lien Secured Term Loan, 09/30/26          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 2.00%   2.00%    
Spread Above Index 7.00%   7.00%    
Investment Interest Rate 11.59%   11.59%    
Investment, Acquisition Date Jul. 19, 2019        
Investment Maturity Date Sep. 30, 2026   Sep. 30, 2026    
Investment Owned, Balance, Principal Amount $ 11,592        
Investment Owned, at Cost 11,563        
Investment Owned, at Fair Value $ 11,592        
Fair Value As A Percentage of Member's Equity 33.50%        
Investment, Identifier [Axis]: Quest Events, LLC Common Units          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember      
Investment, Type [Extensible Enumeration] whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember whfcl:CommonUnitsMember  
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, Acquisition Date Dec. 28, 2018 Dec. 28, 2018      
Investment Owned, Balance, Shares | shares 333 317 333 317  
Investment Owned, at Cost $ 376 $ 360      
Investment Owned, at Fair Value $ 149 $ 305      
Percent of net assets 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] whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember      
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] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight 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%  
Spread Above Index 7.00% 7.25% 7.00% 7.25%  
Investment Interest Rate 11.59% 12.86% 11.59% 12.86%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019      
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 247 $ 247      
Investment Owned, at Cost 246 246      
Investment Owned, at Fair Value $ 248 $ 242      
Fair Value As A Percentage of Member's Equity 0.70% 0.70%      
Investment, Identifier [Axis]: Quest Events, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:QuestEventsLLCMember whfcl:QuestEventsLLCMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
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] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] whfcl:SecuredOvernightFinancingRateSofrMember Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]  
Investment, Interest Rate, Floor 1.00% 2.00% 1.00% 2.00%  
Spread Above Index 6.50% 7.25% 6.50% 7.25%  
Investment Interest Rate 10.90% 12.86% 10.90% 12.86%  
Investment, Acquisition Date Sep. 13, 2024 Jul. 19, 2019      
Investment Maturity Date Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026 Sep. 30, 2026  
Investment Owned, Balance, Principal Amount $ 480 $ 11,709      
Investment Owned, at Cost 472 11,663      
Investment Owned, at Fair Value $ 473 $ 11,557      
Fair Value As A Percentage of Member's Equity   33.30%      
Percent of net assets 0.20%   0.20%    
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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% 6.00% 5.25% 6.00%  
Investment Interest Rate 9.99% 11.53% 9.99% 11.53%  
Investment, Acquisition Date Jan. 27, 2021 Jan. 27, 2021      
Investment Maturity Date Jan. 02, 2029 Dec. 31, 2026 Jan. 02, 2029 Dec. 31, 2026  
Investment Owned, Balance, Principal Amount $ 2,946 $ 2,976      
Investment Owned, at Cost 2,922 2,945      
Investment Owned, at Fair Value $ 2,946 $ 2,965      
Fair Value As A Percentage of Member's Equity 8.50% 8.60%      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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% 6.00% 5.25% 6.00%  
Investment Interest Rate 9.73% 11.50% 9.73% 11.50%  
Investment, Acquisition Date Jan. 27, 2021 Jan. 27, 2021      
Investment Maturity Date Jan. 02, 2029 Dec. 31, 2026 Jan. 02, 2029 Dec. 31, 2026  
Investment Owned, Balance, Principal Amount $ 10,923 $ 11,036      
Investment Owned, at Cost 10,839 10,925      
Investment Owned, at Fair Value $ 10,923 $ 10,993      
Fair Value As A Percentage of Member's Equity 31.60% 31.70%      
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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% 6.00% 5.25% 6.00%  
Investment Interest Rate 9.99% 11.58% 9.99% 11.58%  
Investment, Acquisition Date Jan. 27, 2021 Jan. 27, 2021      
Investment Maturity Date Jan. 02, 2029 Dec. 31, 2026 Jan. 02, 2029 Dec. 31, 2026  
Investment Owned, Balance, Principal Amount   $ 107      
Investment Owned, at Cost   106      
Investment Owned, at Fair Value $ 11 $ 114      
Fair Value As A Percentage of Member's Equity   0.30%      
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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.25%   6.25%    
Investment Interest Rate 10.71%   10.71%    
Investment, Acquisition Date Jan. 23, 2024        
Investment Maturity Date Dec. 31, 2026   Dec. 31, 2026    
Investment Owned, Balance, Principal Amount $ 6,659        
Investment Owned, at Cost 6,566        
Investment Owned, at Fair Value $ 6,637        
Fair Value As A Percentage of Member's Equity 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]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.25%   6.25%    
Investment Interest Rate 10.59%   10.59%    
Investment, Acquisition Date Jun. 21, 2024        
Investment Maturity Date Jun. 21, 2029   Jun. 21, 2029    
Investment Owned, at Fair Value $ 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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.25%   6.25%    
Investment Interest Rate 10.59%   10.59%    
Investment, Acquisition Date Jun. 21, 2024        
Investment Maturity Date Jun. 21, 2029   Jun. 21, 2029    
Investment Owned, Balance, Principal Amount $ 8,756        
Investment Owned, at Cost 8,600        
Investment Owned, at Fair Value $ 8,692        
Percent of net assets 3.00%   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] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member] Preferred Units [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Broadline Retail Broadline Retail Broadline Retail Broadline Retail  
Investment Interest Rate 8.00% 8.00% 8.00% 8.00%  
Investment, Acquisition Date Dec. 04, 2020 Dec. 04, 2020      
Investment Owned, Balance, Shares | shares 600 600 600 600  
Investment Owned, at Cost $ 514 $ 514      
Investment Owned, at Fair Value $ 756 $ 832      
Investment, Interest Rate, Paid in Kind 8.00% 8.00% 8.00% 8.00%  
Percent of net assets 0.30% 0.30% 0.30% 0.30%  
Investment, Identifier [Axis]: SFS Global Holding Company Warrants          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SFSGlobalHoldingCompanyMember      
Investment, Type [Extensible Enumeration]   Warrant [Member]   Warrant [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Other Diversified Financial Services [Member]   Other Diversified Financial Services [Member]  
Investment, Acquisition Date   Jun. 28, 2018      
Investment Maturity Date   Dec. 28, 2025   Dec. 28, 2025  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member]   Specialized Consumer Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.00%   8.00%    
Investment Interest Rate 12.46%   12.46%    
Investment, Acquisition Date Dec. 02, 2022        
Investment Maturity Date Dec. 02, 2027   Dec. 02, 2027    
Investment Owned, Balance, Principal Amount $ 1,669        
Investment Owned, at Cost 1,641        
Investment Owned, at Fair Value $ 1,672        
Percent of net assets 0.60%   0.60%    
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicHoldingsLlcMember        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Specialized Consumer Services [Member]   Specialized Consumer Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.00%   8.00%    
Investment Interest Rate 12.46%   12.46%    
Investment, Acquisition Date Dec. 02, 2022        
Investment Maturity Date Dec. 02, 2027   Dec. 02, 2027    
Investment Owned, at Fair Value $ 13        
Investment, Identifier [Axis]: Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC) First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:SalonRepublicHoldingsLlcMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [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, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 8.00%   8.00%    
Investment Interest Rate 12.46%   12.46%    
Investment, Acquisition Date Dec. 02, 2022        
Investment Maturity Date Dec. 02, 2027   Dec. 02, 2027    
Investment Owned, Balance, Principal Amount $ 5,076        
Investment Owned, at Cost 4,988        
Investment Owned, at Fair Value $ 5,063        
Percent of net assets 1.80%   1.80%    
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      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   12.96%   12.96%  
Investment, Acquisition Date   Dec. 02, 2022      
Investment Maturity Date   Dec. 02, 2027   Dec. 02, 2027  
Investment Owned, Balance, Principal Amount   $ 741      
Investment Owned, at Cost   729      
Investment Owned, at Fair Value   $ 745      
Percent of net assets   0.20%   0.20%  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   12.96%   12.96%  
Investment, Acquisition Date   Dec. 02, 2022      
Investment Maturity Date   Dec. 02, 2027   Dec. 02, 2027  
Investment Owned, Balance, Principal Amount   $ 251      
Investment Owned, at Cost   245      
Investment Owned, at Fair Value   $ 258      
Percent of net assets   0.10%   0.10%  
Investment, Identifier [Axis]: Salon Republic Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SalonRepublicHoldingsLlcMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   12.96%   12.96%  
Investment, Acquisition Date   Dec. 02, 2022      
Investment Maturity Date   Dec. 02, 2027   Dec. 02, 2027  
Investment Owned, Balance, Principal Amount   $ 5,121      
Investment Owned, at Cost   5,001      
Investment Owned, at Fair Value   $ 5,077      
Percent of net assets   1.60%   1.60%  
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]  
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   $ 241      
Percent of net assets   0.10%   0.10%  
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  
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   200   200  
Investment Owned, at Cost   $ 200      
Investment Owned, at Fair Value   $ 218      
Investment, Interest Rate, Paid in Kind   8.00%   8.00%  
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]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Operating Companies   Real Estate Operating Companies    
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 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    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Real Estate Operating Companies   Real Estate Operating Companies    
Investment Interest Rate 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        
Investment, Interest Rate, Paid in Kind 8.00%   8.00%    
Percent of net assets 0.10%   0.10%    
Investment, Identifier [Axis]: Sigue Corporation Warrants          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SigueCorporationMember      
Investment, Type [Extensible Enumeration]   Warrant [Member]   Warrant [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Other Diversified Financial Services [Member]   Other Diversified Financial Services [Member]  
Investment, Acquisition Date   Jun. 28, 2018      
Investment Maturity Date   Dec. 28, 2025   Dec. 28, 2025  
Investment Owned, Balance, Shares | shares   22   22  
Investment Owned, at Cost   $ 2,890      
Investment Owned, at Fair Value   $ 3,472      
Percent of net assets   1.10%   1.10%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 11.28% 12.07% 11.28% 12.07%  
Investment, Acquisition Date Oct. 12, 2021 Oct. 12, 2021      
Investment Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026  
Investment Owned, at Fair Value $ 5 $ 3      
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 11.28% 12.07% 11.28% 12.07%  
Investment, Acquisition Date Oct. 12, 2021 Oct. 12, 2021      
Investment Maturity Date Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026 Oct. 12, 2026  
Investment Owned, Balance, Principal Amount $ 22,590 $ 20,616      
Investment Owned, at Cost 22,401 20,385      
Investment Owned, at Fair Value $ 22,441 $ 20,407      
Percent of net assets 7.80% 6.40% 7.80% 6.40%  
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:SmaltoInc.Member        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Household Appliances   Household Appliances    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 8.86%   8.86%    
Investment, Acquisition Date May 04, 2022        
Investment Maturity Date Apr. 28, 2028   Apr. 28, 2028    
Investment Owned, Balance, Principal Amount $ 6,423        
Investment Owned, at Cost 6,682        
Investment Owned, at Fair Value $ 6,654        
Fair Value As A Percentage of Member's Equity 19.20%        
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan Interest Rate 10.18          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Household Appliances   Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:EuroInterbankOfferedRateMember   whfcl:EuroInterbankOfferedRateMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.25%   6.25%  
Investment Interest Rate   10.18%   10.18%  
Investment, Acquisition Date   May 04, 2022      
Investment Maturity Date   Apr. 28, 2028   Apr. 28, 2028  
Investment Owned, Balance, Principal Amount   $ 6,576      
Investment Owned, at Cost   6,821      
Investment Owned, at Fair Value   $ 7,172      
Fair Value As A Percentage of Member's Equity   20.70%      
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan Interest Rate 11.50          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SmaltoInc.Member      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.00%   6.00%  
Investment Interest Rate   11.50%   11.50%  
Investment, Acquisition Date   May 04, 2022      
Investment Maturity Date   Apr. 28, 2028   Apr. 28, 2028  
Investment Owned, Balance, Principal Amount   $ 1,001      
Investment Owned, at Cost   987      
Investment Owned, at Fair Value   $ 996      
Fair Value As A Percentage of Member's Equity   2.90%      
Investment, Identifier [Axis]: Smalto Inc, First Lien Secured Term Loan One          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:SmaltoInc.Member        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.75%   5.75%    
Investment Interest Rate 10.21%   10.21%    
Investment, Acquisition Date May 04, 2022        
Investment Maturity Date Apr. 28, 2028   Apr. 28, 2028    
Investment Owned, Balance, Principal Amount $ 978        
Investment Owned, at Cost 967        
Investment Owned, at Fair Value $ 978        
Fair Value As A Percentage of Member's Equity 2.80%        
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  
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, Acquisition Date Jun. 29, 2020 Jun. 29, 2020      
Investment Owned, Balance, Shares | shares 2 2 2 2  
Investment Owned, at Cost $ 1,941 $ 1,941      
Investment Owned, at Fair Value $ 173 $ 130      
Percent of net assets 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  
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 Interest Rate 9.50% 9.50% 9.50% 9.50%  
Investment, Acquisition Date Jun. 29, 2020 Jun. 29, 2020      
Investment Owned, Balance, Principal Amount $ 1,822 $ 1,657      
Investment Owned, at Cost 1,819 1,654      
Investment Owned, at Fair Value $ 1,790 $ 1,623      
Investment, Interest Rate, Paid in Kind   9.50%   9.50%  
Percent of net assets 0.60% 0.50% 0.60% 0.50%  
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]  
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, Acquisition Date Jun. 29, 2020 Jun. 29, 2020      
Investment Owned, Balance, Shares | shares 1 1 1 1  
Investment Owned, at Cost $ 793 $ 793      
Investment Owned, at Fair Value $ 70 $ 53      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:CanadianDollarOfferedRateMember   whfcl:CanadianDollarOfferedRateMember  
Investment, Interest Rate, Floor   0.50%   0.50%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.94%   11.94%  
Investment, Acquisition Date   Mar. 23, 2023      
Investment Maturity Date   Sep. 28, 2029   Sep. 28, 2029  
Investment Owned, Balance, Principal Amount   $ 3,873      
Investment Owned, at Cost   2,759      
Investment Owned, at Fair Value   $ 2,892      
Fair Value As A Percentage of Member's Equity   8.30%      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SOFR          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   0.50%   0.50%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.85%   11.85%  
Investment, Acquisition Date   Mar. 23, 2023      
Investment Maturity Date   Sep. 28, 2029   Sep. 28, 2029  
Investment Owned, Balance, Principal Amount   $ 2,807      
Investment Owned, at Cost   2,744      
Investment Owned, at Fair Value   $ 2,786      
Fair Value As A Percentage of Member's Equity   8.00%      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]  
Investment, Interest Rate, Floor   0.00%   0.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.72%   11.72%  
Investment, Acquisition Date   Mar. 23, 2023      
Investment Maturity Date   Sep. 28, 2029   Sep. 28, 2029  
Investment Owned, Balance, Principal Amount   $ 171      
Investment Owned, at Cost   205      
Investment Owned, at Fair Value   $ 217      
Fair Value As A Percentage of Member's Equity   0.60%      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan CDOR          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   whfcl:CanadianDollarOfferedRateMember   whfcl:CanadianDollarOfferedRateMember  
Investment, Interest Rate, Floor   0.50%   0.50%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   12.08%   12.08%  
Investment, Acquisition Date   Mar. 23, 2023      
Investment Maturity Date   Sep. 28, 2029   Sep. 28, 2029  
Investment Owned, Balance, Principal Amount   $ 458      
Investment Owned, at Cost   324      
Investment Owned, at Fair Value   $ 342      
Fair Value As A Percentage of Member's Equity   1.00%      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan SOFR          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   0.50%   0.50%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.85%   11.85%  
Investment, Acquisition Date   Mar. 23, 2023      
Investment Maturity Date   Sep. 28, 2029   Sep. 28, 2029  
Investment Owned, Balance, Principal Amount   $ 368      
Investment Owned, at Cost   360      
Investment Owned, at Fair Value   $ 366      
Fair Value As A Percentage of Member's Equity   1.10%      
Investment, Identifier [Axis]: Solar Holdings Bidco Limited, First Lien Secured Delayed Draw Loan SONIA          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SolarHoldingsBidcoLimitedMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Research & Consulting Services   Research & Consulting Services  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Sterling Overnight Index Average [Member]   Sterling Overnight Index Average [Member]  
Investment, Interest Rate, Floor   0.00%   0.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.71%   11.71%  
Investment, Acquisition Date   Mar. 23, 2023      
Investment Maturity Date   Sep. 28, 2029   Sep. 28, 2029  
Investment Owned, Balance, Principal Amount   $ 723      
Investment Owned, at Cost   882      
Investment Owned, at Fair Value   $ 984      
Fair Value As A Percentage of Member's Equity   2.80%      
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      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   Aug. 10, 2021      
Investment Maturity Date   Jul. 30, 2027   Jul. 30, 2027  
Investment Owned, Balance, Principal Amount   $ 4,088      
Investment Owned, at Cost   4,039      
Investment Owned, at Fair Value   $ 4,047      
Fair Value As A Percentage of Member's Equity   11.70%      
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SourceCodeHoldingsLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   Aug. 10, 2021      
Investment Maturity Date   Jul. 30, 2027   Jul. 30, 2027  
Investment Owned, Balance, Principal Amount   $ 14,952      
Investment Owned, at Cost   14,772      
Investment Owned, at Fair Value   $ 14,806      
Fair Value As A Percentage of Member's Equity   42.70%      
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
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 Aug. 10, 2021        
Investment Maturity Date Jul. 30, 2027   Jul. 30, 2027    
Investment Owned, Balance, Principal Amount $ 3,872        
Investment Owned, at Cost 3,839        
Investment Owned, at Fair Value $ 3,854        
Fair Value As A Percentage of Member's Equity 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
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 Aug. 10, 2021        
Investment Maturity Date Jul. 30, 2027   Jul. 30, 2027    
Investment Owned, Balance, Principal Amount $ 14,162        
Investment Owned, at Cost 14,041        
Investment Owned, at Fair Value $ 14,095        
Fair Value As A Percentage of Member's Equity 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  
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, Acquisition Date Dec. 01, 2023 Dec. 01, 2023      
Investment Owned, Balance, Shares | shares 404 404 404 404  
Investment Owned, at Cost $ 404 $ 404      
Investment Owned, at Fair Value $ 388 $ 404      
Percent of net assets 0.10% 0.10% 0.10% 0.10%  
Investment, Identifier [Axis]: StoicLane MidCo, LLC First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:StoiclaneMidcoLlcMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   13.00%   13.00%  
Investment, Acquisition Date   Nov. 04, 2022      
Investment Maturity Date   Nov. 04, 2027   Nov. 04, 2027  
Investment Owned, Balance, Principal Amount   $ 5,545      
Investment Owned, at Cost   5,466      
Investment Owned, at Fair Value   $ 5,633      
Percent of net assets   1.80%   1.80%  
Investment, Identifier [Axis]: StoicLane MidCo, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:StoiclaneMidcoLlcMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.50%   7.50%  
Investment Interest Rate   13.00%   13.00%  
Investment, Acquisition Date   Nov. 04, 2022      
Investment Maturity Date   Nov. 04, 2027   Nov. 04, 2027  
Investment Owned, Balance, Principal Amount   $ 4,606      
Investment Owned, at Cost   4,518      
Investment Owned, at Fair Value   $ 4,606      
Percent of net assets   1.50%   1.50%  
Investment, Identifier [Axis]: Sunless, Inc. First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SunlessInc.Member      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.75%   6.75%  
Investment Interest Rate   12.21%   12.21%  
Investment, Acquisition Date   Oct. 21, 2019      
Investment Maturity Date   Aug. 13, 2025   Aug. 13, 2025  
Investment Owned, Balance, Principal Amount   $ 488      
Investment Owned, at Cost   485      
Investment Owned, at Fair Value   $ 484      
Fair Value As A Percentage of Member's Equity   1.40%      
Investment, Identifier [Axis]: Sunless, Inc. First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:SunlessInc.Member      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   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]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   6.75%   6.75%  
Investment Interest Rate   12.20%   12.20%  
Investment, Acquisition Date   Oct. 21, 2019      
Investment Maturity Date   Aug. 13, 2025   Aug. 13, 2025  
Investment Owned, Balance, Principal Amount   $ 5,507      
Investment Owned, at Cost   5,459      
Investment Owned, at Fair Value   $ 5,473      
Fair Value As A Percentage of Member's Equity   15.80%      
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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.46%   10.46%    
Investment, Acquisition Date Sep. 06, 2024        
Investment Maturity Date Sep. 06, 2029   Sep. 06, 2029    
Investment Owned, Balance, Principal Amount $ 584        
Investment Owned, at Cost 573        
Investment Owned, at Fair Value $ 577        
Percent of net assets 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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember   us-gaap:PrimeRateMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.00%   5.00%    
Investment Interest Rate 12.50%   12.50%    
Investment, Acquisition Date Sep. 06, 2024        
Investment Maturity Date Sep. 06, 2029   Sep. 06, 2029    
Investment Owned, Balance, Principal Amount $ 585        
Investment Owned, at Cost 574        
Investment Owned, at Fair Value $ 576        
Percent of net assets 0.20%   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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Leisure Products   Leisure Products    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.00%   6.00%    
Investment Interest Rate 10.44%   10.44%    
Investment, Acquisition Date Sep. 06, 2024        
Investment Maturity Date Sep. 06, 2029   Sep. 06, 2029    
Investment Owned, Balance, Principal Amount $ 5,737        
Investment Owned, at Cost 5,629        
Investment Owned, at Fair Value $ 5,643        
Percent of net assets 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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member]   Transaction & Payment Processing Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 7.50%   7.50%    
Investment Interest Rate 11.83%   11.83%    
Investment, Acquisition Date Jun. 28, 2024        
Investment Maturity Date Jun. 28, 2029   Jun. 28, 2029    
Investment Owned, at Fair Value $ (1)        
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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member]   Transaction & Payment Processing Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 7.50%   7.50%    
Investment Interest Rate 11.83%   11.83%    
Investment, Acquisition Date Jun. 28, 2024        
Investment Maturity Date 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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Transaction & Payment Processing Services [Member]   Transaction & Payment Processing Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 7.50%   7.50%    
Investment Interest Rate 11.83%   11.83%    
Investment, Acquisition Date Jun. 28, 2024        
Investment Maturity Date Jun. 28, 2029   Jun. 28, 2029    
Investment Owned, Balance, Principal Amount $ 8,239        
Investment Owned, at Cost 8,074        
Investment Owned, at Fair Value $ 8,067        
Percent of net assets 2.80%   2.80%    
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:TOURIntermediateHoldingsLLCMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Investment Banking & Brokerage   Investment Banking & Brokerage  
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   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   May 19, 2020      
Investment Maturity Date   May 15, 2025   May 15, 2025  
Investment Owned, Balance, Principal Amount   $ 2,320      
Investment Owned, at Cost   2,315      
Investment Owned, at Fair Value   $ 2,320      
Fair Value As A Percentage of Member's Equity   6.70%      
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:TOURIntermediateHoldingsLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Investment Banking & Brokerage   Investment Banking & Brokerage  
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   6.50%   6.50%  
Investment Interest Rate   11.96%   11.96%  
Investment, Acquisition Date   May 19, 2020      
Investment Maturity Date   May 15, 2025   May 15, 2025  
Investment Owned, Balance, Principal Amount   $ 2,657      
Investment Owned, at Cost   2,643      
Investment Owned, at Fair Value   $ 2,657      
Fair Value As A Percentage of Member's Equity   7.70%      
Investment, Identifier [Axis]: TableTrust Brands LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:TabletrustBrandsLlcMember        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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    
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 5.75%   5.75%    
Investment Interest Rate 10.22%   10.22%    
Investment, Acquisition Date Dec. 24, 2024        
Investment Maturity Date Jun. 28, 2028   Jun. 28, 2028    
Investment Owned, Balance, Principal Amount $ 2,505        
Investment Owned, at Cost 2,468        
Investment Owned, at Fair Value $ 2,468        
Fair Value As A Percentage of Member's Equity 7.10%        
Investment, Identifier [Axis]: Team Car Care Holdings, First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:TeamCarCareHoldingsLLCMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration]   Automotive Retail [Member]   Automotive Retail [Member]  
Investment, Variable Interest Rate, Type [Extensible Enumeration]   Base Rate [Member]   Base Rate [Member]  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.48%   7.48%  
Investment Interest Rate   13.09%   13.09%  
Investment, Acquisition Date   Feb. 16, 2018      
Investment Maturity Date   Dec. 31, 2024   Dec. 31, 2024  
Investment Owned, Balance, Principal Amount   $ 12,407      
Investment Owned, at Cost   12,391      
Investment Owned, at Fair Value   $ 12,407      
Percent of net assets   3.90%   3.90%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 9.75% 11.75% 9.75% 11.75%  
Investment Interest Rate   17.21%   17.21%  
Investment, Acquisition Date Oct. 15, 2020 Oct. 15, 2020      
Investment Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025  
Investment Owned, Balance, Principal Amount $ 1,116 $ 1,242      
Investment Owned, at Cost 1,051 1,228      
Investment Owned, at Fair Value $ 1,009 $ 1,223      
Investment, Interest Rate, Paid in Kind 14.21%   14.21%    
Percent of net assets 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 9.75% 11.75% 9.75% 11.75%  
Investment Interest Rate   17.28%   17.28%  
Investment, Acquisition Date Oct. 15, 2020 Oct. 15, 2020      
Investment Maturity Date Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025 Oct. 15, 2025  
Investment Owned, Balance, Principal Amount $ 18,547 $ 15,763      
Investment Owned, at Cost 17,496 15,580      
Investment Owned, at Fair Value $ 17,063 $ 15,522      
Investment, Interest Rate, Paid in Kind 14.21%   14.21%    
Percent of net assets 5.90% 4.90% 5.90% 4.90%  
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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% 7.50% 6.50% 7.50%  
Investment Interest Rate 10.97% 13.21% 10.97% 13.21%  
Investment, Acquisition Date Apr. 05, 2021 Apr. 05, 2021      
Investment Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026  
Investment Owned, Balance, Principal Amount $ 798        
Investment Owned, at Cost 795        
Investment Owned, at Fair Value $ 761 $ (31)      
Investment, Interest Rate, Paid in Kind 0.75% 1.00% 0.75% 1.00%  
Investment, Interest Rate, Paid in Cash 10.22% 12.21% 10.22% 12.21%  
Percent of net assets 0.30%   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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 7.25% 7.50% 7.25% 7.50%  
Investment Interest Rate 12.05% 13.21% 12.05% 13.21%  
Investment, Acquisition Date Apr. 05, 2021 Apr. 05, 2021      
Investment Maturity Date Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026 Apr. 05, 2026  
Investment Owned, Balance, Principal Amount $ 11,350 $ 11,358      
Investment Owned, at Cost 11,309 11,282      
Investment Owned, at Fair Value $ 10,895 $ 10,904      
Investment, Interest Rate, Paid in Kind 0.75% 1.00% 0.75% 1.00%  
Investment, Interest Rate, Paid in Cash 11.30% 12.21% 11.30% 12.21%  
Percent of net assets 3.80% 3.40% 3.80% 3.40%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Household Appliances Household Appliances Household Appliances Household Appliances  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 0.50% 0.50% 0.50% 0.50%  
Spread Above Index 6.00% 6.00% 6.00% 6.00%  
Investment Interest Rate 10.74% 11.53% 10.74% 11.53%  
Investment, Acquisition Date May 26, 2022 May 26, 2022      
Investment Maturity Date May 31, 2029 May 31, 2029 May 31, 2029 May 31, 2029  
Investment Owned, Balance, Principal Amount $ 7,070 $ 7,142      
Investment Owned, at Cost 6,709 6,695      
Investment Owned, at Fair Value $ 5,658 $ 5,966      
Percent of net assets 2.00% 1.90% 2.00% 1.90%  
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]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.82%   9.82%    
Investment, Acquisition Date Dec. 30, 2024        
Investment Maturity Date Dec. 28, 2029   Dec. 28, 2029    
Investment, Interest Rate, Paid in Kind 0.75%   0.75%    
Investment, Interest Rate, Paid in Cash 9.07%   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]        
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.82%   9.82%    
Investment, Acquisition Date Dec. 30, 2024        
Investment Maturity Date Dec. 28, 2029   Dec. 28, 2029    
Investment, Interest Rate, Paid in Kind 0.75%   0.75%    
Investment, Interest Rate, Paid in Cash 9.07%   9.07%    
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]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.82%   9.82%    
Investment, Acquisition Date Dec. 30, 2024        
Investment Maturity Date Dec. 28, 2029   Dec. 28, 2029    
Investment Owned, Balance, Principal Amount $ 6,648        
Investment Owned, at Cost 6,548        
Investment Owned, at Fair Value $ 6,548        
Investment, Interest Rate, Paid in Kind 0.75%   0.75%    
Investment, Interest Rate, Paid in Cash 9.07%   9.07%    
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor 2.00% 2.00% 2.00% 2.00%  
Spread Above Index 7.25% 7.50% 7.25% 7.50%  
Investment Interest Rate 11.71% 12.96% 11.71% 12.96%  
Investment, Acquisition Date Jun. 29, 2023 Jun. 29, 2023      
Investment Maturity Date Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028 Jun. 29, 2028  
Investment Owned, Balance, Principal Amount $ 8,663 $ 8,888      
Investment Owned, at Cost 8,481 8,648      
Investment Owned, at Fair Value $ 8,715 $ 8,743      
Percent of net assets 3.00% 2.80% 3.00% 2.80%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] country:CA country:CA country:CA country:CA  
Investment, Industry Sector [Extensible Enumeration] Building Products Building Products Building Products Building Products  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember whfcl:CanadianDollarOfferedRateMember  
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 9.99% 11.94% 9.99% 11.94%  
Investment, Acquisition Date Jul. 27, 2021 Jul. 27, 2021      
Investment Maturity Date Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027 Jul. 27, 2027  
Investment Owned, Balance, Principal Amount     $ 18,984 $ 19,624  
Investment Owned, at Cost $ 15,006 $ 15,472      
Investment Owned, at Fair Value $ 13,206 $ 14,810      
Percent of net assets 4.60% 4.70% 4.60% 4.70%  
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.83%   9.83%    
Investment, Acquisition Date Jun. 14, 2024        
Investment Maturity Date May 31, 2029   May 31, 2029    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.83%   9.83%    
Investment, Acquisition Date Jun. 14, 2024        
Investment Maturity Date May 31, 2029   May 31, 2029    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] 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]    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 5.50%   5.50%    
Investment Interest Rate 9.83%   9.83%    
Investment, Acquisition Date Jun. 14, 2024        
Investment Maturity Date May 31, 2029   May 31, 2029    
Investment Owned, Balance, Principal Amount $ 5,349        
Investment Owned, at Cost 5,254        
Investment Owned, at Fair Value $ 5,338        
Fair Value As A Percentage of Member's Equity 15.40%        
Investment, Identifier [Axis]: Turnberry Solutions., 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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 10.21% 11.45% 10.21% 11.45%  
Investment, Acquisition Date Aug. 10, 2021 Aug. 10, 2021      
Investment Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026  
Investment Owned, at Fair Value $ 4 $ 2      
Investment, Identifier [Axis]: Turnberry Solutions., 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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
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 10.21% 11.45% 10.21% 11.45%  
Investment, Acquisition Date Aug. 10, 2021 Aug. 10, 2021      
Investment Maturity Date Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026 Sep. 02, 2026  
Investment Owned, Balance, Principal Amount $ 5,964 $ 6,026      
Investment Owned, at Cost 5,924 5,962      
Investment Owned, at Fair Value $ 5,964 $ 5,979      
Fair Value As A Percentage of Member's Equity 17.20% 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        
Investment, Type [Extensible Enumeration] whfcl:ClassCommonUnitsMember   whfcl:ClassCommonUnitsMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Food Distributors   Food Distributors    
Investment, Acquisition Date May 10, 2024        
Investment Owned, Balance, Shares | shares 63   63    
Investment Owned, at Cost $ 317        
Investment Owned, at Fair Value $ 350        
Percent of net assets 0.10%   0.10%    
Investment, Identifier [Axis]: US Methanol Midco LLC (d/b/a US Methanol LLC) First Lien Secured Delayed Draw Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:UsMethanolMidcoLlcMember      
Investment, Type [Extensible Enumeration]   whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.75%   7.75%  
Investment Interest Rate   13.29%   13.29%  
Investment, Acquisition Date   Dec. 20, 2022      
Investment Maturity Date   Dec. 20, 2027   Dec. 20, 2027  
Investment Owned, Balance, Principal Amount   $ 9,540      
Investment Owned, at Cost   9,345      
Investment Owned, at Fair Value   $ 9,449      
Percent of net assets   3.00%   3.00%  
Investment, Identifier [Axis]: US Methanol Midco LLC (d/b/a US Methanol LLC) First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration]   whfcl:UsMethanolMidcoLlcMember      
Investment, Type [Extensible Enumeration]   First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]  
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:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember  
Investment, Interest Rate, Floor   1.00%   1.00%  
Spread Above Index   7.75%   7.75%  
Investment Interest Rate   13.28%   13.28%  
Investment, Acquisition Date   Dec. 20, 2022      
Investment Maturity Date   Dec. 20, 2027   Dec. 20, 2027  
Investment Owned, Balance, Principal Amount   $ 5,203      
Investment Owned, at Cost   5,111      
Investment Owned, at Fair Value   $ 5,153      
Percent of net assets   1.60%   1.60%  
Investment, Identifier [Axis]: UserZoom Technologies, Inc. First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] whfcl:UserzoomTechnologiesIncMember whfcl:UserzoomTechnologiesIncMember      
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment, Industry Sector [Extensible Enumeration] Application Software Application Software Application Software Application Software  
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 7.50% 7.50% 7.50% 7.50%  
Investment Interest Rate 12.75% 12.99% 12.75% 12.99%  
Investment, Acquisition Date Jan. 12, 2023 Jan. 12, 2023      
Investment Maturity Date Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029 Apr. 05, 2029  
Investment Owned, Balance, Principal Amount $ 9,819 $ 9,819      
Investment Owned, at Cost 9,618 9,570      
Investment Owned, at Fair Value $ 9,809 $ 9,719      
Percent of net assets 3.40% 3.20% 3.40% 3.20%  
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:SeriesUnitsMember whfcl:ClassAUnitsMember whfcl:SeriesUnitsMember whfcl:ClassAUnitsMember  
Investment, Issuer Geographic Region [Extensible Enumeration] 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  
Investment, Acquisition Date Apr. 10, 2023 Apr. 10, 2023      
Investment Owned, at Cost $ 314 $ 314      
Investment Owned, at Fair Value $ 493 $ 406      
Percent of net assets 0.20% 0.10% 0.20% 0.10%  
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC First Lien Secured Revolving Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] W Electric Intermediate Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 10.86%   10.86%    
Investment, Acquisition Date Aug. 15, 2024        
Investment Maturity Date Aug. 15, 2029   Aug. 15, 2029    
Investment Owned, at Fair Value $ 9        
Investment, Interest Rate, Paid in Kind 1.00%   1.00%    
Investment, Interest Rate, Paid in Cash 9.86%   9.86%    
Investment, Identifier [Axis]: W Electric Intermediate Holdings, LLC First Lien Secured Term Loan          
Schedule of Investments [Line Items]          
Investment, Issuer Name [Extensible Enumeration] W Electric Intermediate Holdings, LLC [Member]        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Industrial Machinery & Supplies & Components   Industrial Machinery & Supplies & Components    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 10.86%   10.86%    
Investment, Acquisition Date Aug. 15, 2024        
Investment Maturity Date Aug. 15, 2029   Aug. 15, 2029    
Investment Owned, Balance, Principal Amount $ 12,322        
Investment Owned, at Cost 12,124        
Investment Owned, at Fair Value $ 12,216        
Investment, Interest Rate, Paid in Kind 1.00%   1.00%    
Investment, Interest Rate, Paid in Cash 9.86%   9.86%    
Percent of net assets 4.30%   4.30%    
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  
Investment Owned, at Fair Value $ 22,741 $ 22,782     20,160
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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019      
Investment Owned, Balance, Shares | shares 21,104 21,104 21,104 21,104  
Investment Owned, at Cost $ 21,104 $ 21,104      
Investment Owned, at Fair Value $ 22,741 $ 22,782      
Percent of net assets 7.90% 7.20% 7.90% 7.20%  
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]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember whfcl:SecuredOvernightFinancingRateSofrMember  
Spread Above Index 6.50% 6.50% 6.50% 6.50%  
Investment Interest Rate 10.83% 11.85% 10.83% 11.85%  
Investment, Acquisition Date Jul. 19, 2019 Jul. 19, 2019      
Investment Owned, Balance, Principal Amount $ 84,416 $ 84,416      
Investment Owned, at Cost 84,416 84,416      
Investment Owned, at Fair Value $ 84,416 $ 84,416     $ 80,000
Percent of net assets 29.50% 26.60% 29.50% 26.60%  
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredDelayedDrawLoanMember   whfcl:FirstLienSecuredDelayedDrawLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services   Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.25%   6.25%    
Investment Interest Rate 10.58%   10.58%    
Investment, Acquisition Date Aug. 01, 2024        
Investment Maturity Date Aug. 01, 2029   Aug. 01, 2029    
Investment Owned, at Fair Value $ 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        
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 Services   Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.25%   6.25%    
Investment Interest Rate 10.58%   10.58%    
Investment, Acquisition Date Aug. 01, 2024        
Investment Maturity Date Aug. 01, 2029   Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 258        
Investment Owned, at Cost 253        
Investment Owned, at Fair Value $ 254        
Percent of net assets 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Health Care Services   Health Care Services    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.25%   6.25%    
Investment Interest Rate 10.58%   10.58%    
Investment, Acquisition Date Aug. 01, 2024        
Investment Maturity Date Aug. 01, 2029   Aug. 01, 2029    
Investment Owned, Balance, Principal Amount $ 7,689        
Investment Owned, at Cost 7,548        
Investment Owned, at Fair Value $ 7,555        
Percent of net assets 2.60%   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  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
Investment, Acquisition Date Jul. 02, 2021 Jul. 02, 2021      
Investment Owned, Balance, Shares | shares 3,081 3,081 3,081 3,081  
Investment Owned, at Cost $ 851 $ 851      
Investment Owned, at Fair Value $ 1,756 $ 1,615      
Percent of net assets 0.60% 0.50% 0.60% 0.50%  
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] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member] First Lien Secured Term Loan [Member]  
Investment, Issuer Geographic Region [Extensible Enumeration] 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]  
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 6.00% 6.50% 6.00% 6.50%  
Investment Interest Rate 10.46% 11.96% 10.46% 11.96%  
Investment, Acquisition Date Nov. 06, 2023 Nov. 06, 2023      
Investment Maturity Date Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026 Aug. 20, 2026  
Investment Owned, Balance, Principal Amount $ 2,930 $ 2,990      
Investment Owned, at Cost 2,887 2,919      
Investment Owned, at Fair Value $ 2,930 $ 2,919      
Percent of net assets 1.00% 0.90% 1.00% 0.90%  
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        
Investment, Type [Extensible Enumeration] whfcl:FirstLienSecuredRevolvingLoanMember   whfcl:FirstLienSecuredRevolvingLoanMember    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member]   Interactive Media And Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 10.83%   10.83%    
Investment, Acquisition Date Jan. 31, 2024        
Investment Maturity Date Jan. 31, 2030   Jan. 31, 2030    
Investment Owned, at Fair Value $ 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        
Investment, Type [Extensible Enumeration] First Lien Secured Term Loan [Member]   First Lien Secured Term Loan [Member]    
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment, Industry Sector [Extensible Enumeration] Interactive Media And Services [Member]   Interactive Media And Services [Member]    
Investment, Variable Interest Rate, Type [Extensible Enumeration] whfcl:SecuredOvernightFinancingRateSofrMember   whfcl:SecuredOvernightFinancingRateSofrMember    
Investment, Interest Rate, Floor 1.00%   1.00%    
Spread Above Index 6.50%   6.50%    
Investment Interest Rate 10.83%   10.83%    
Investment, Acquisition Date Jan. 31, 2024        
Investment Maturity Date Jan. 31, 2030   Jan. 31, 2030    
Investment Owned, Balance, Principal Amount $ 14,087        
Investment Owned, at Cost 13,789        
Investment Owned, at Fair Value $ 14,166        
Percent of net assets 5.00%   5.00%    
Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember, country:CA srt:NorthAmericaMember, country:CA srt:NorthAmericaMember, country:CA srt:NorthAmericaMember, country:CA  
Investment Owned, at Cost $ 631,941 $ 693,621      
Investment Owned, at Fair Value $ 596,626 $ 656,707      
Percent of net assets 208.40% 207.40% 208.40% 207.40%  
Money Market Funds          
Schedule of Investments [Line Items]          
Money Market Funds amortized cost $ 13,249        
Money Market Fair Value $ 13,249        
Percent of net assets 4.60%   4.60%    
Money Market Funds | STRS JV          
Schedule of Investments [Line Items]          
Money Market Funds amortized cost $ 767        
Money Market Fair Value $ 767        
Percent of net assets 2.20%   2.20%    
Goldman Sachs Money Market Fund (CUSIP: 38141W315)          
Schedule of Investments [Line Items]          
Weighted average interest rate 4.33%   4.33%    
Money Market Funds amortized cost $ 837        
Money Market Fair Value $ 837        
Percent of net assets 0.30%   0.30%    
Goldman Sachs Money Market Fund (CUSIP: 38141W315) | STRS JV          
Schedule of Investments [Line Items]          
Weighted average interest rate 4.33%   4.33%    
Money Market Funds amortized cost $ 242        
Money Market Fair Value $ 242        
Percent of net assets 0.70%   0.70%    
Invesco Treasury Money Market Fund (CUSIP: X9USDINVE)          
Schedule of Investments [Line Items]          
Weighted average interest rate 3.83%   3.83%    
Money Market Funds amortized cost $ 12,412        
Money Market Fair Value $ 12,412        
Percent of net assets 4.30%   4.30%    
Invesco Treasury Money Market Fund (CUSIP: X9USDINVE) | STRS JV          
Schedule of Investments [Line Items]          
Weighted average interest rate 4.39%   4.39%    
Money Market Funds amortized cost $ 525        
Money Market Fair Value $ 525        
Percent of net assets 1.50%   1.50%    
Advertising          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 11,937 $ 12,009      
Investment Owned, at Fair Value $ 12,035 $ 12,040      
Fair Value As A Percentage of Member's Equity 34.80% 34.70%      
Advertising | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 16,365        
Investment Owned, at Fair Value $ 16,862        
Percent of net assets 6.00%   6.00%    
Air Freight & Logistics          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 3,286 $ 3,503      
Investment Owned, at Fair Value $ 3,311 $ 3,504      
Fair Value As A Percentage of Member's Equity 9.60% 10.10%      
Air Freight & Logistics | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 29,360 $ 23,689      
Investment Owned, at Fair Value $ 28,518 $ 22,616      
Percent of net assets 9.90% 7.20% 9.90% 7.20%  
Aerospace & Defense          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 3,633        
Investment Owned, at Fair Value $ 3,682        
Fair Value As A Percentage of Member's Equity 10.60%        
Application Software | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 36,508 $ 39,567      
Investment Owned, at Fair Value $ 26,924 $ 34,202      
Percent of net assets 9.40% 11.00% 9.40% 11.00%  
Broadline Retail          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 18,577 $ 18,798      
Investment Owned, at Fair Value $ 17,827 $ 18,759      
Fair Value As A Percentage of Member's Equity 51.50% 54.10%      
Broadline Retail | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 4,556 $ 19,000      
Investment Owned, at Fair Value $ 4,580 $ 19,079      
Percent of net assets 1.60% 6.10% 1.60% 6.10%  
Building Products          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 13,445 $ 13,541      
Investment Owned, at Fair Value $ 13,437 $ 13,313      
Fair Value As A Percentage of Member's Equity 38.80% 38.40%      
Building Products | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] country:CA country:CA country:CA country:CA  
Investment Owned, at Cost $ 15,006 $ 15,472      
Investment Owned, at Fair Value $ 13,206 $ 14,810      
Percent of net assets 4.60% 4.70% 4.60% 4.70%  
Construction & Engineering          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 16,016 $ 9,476      
Investment Owned, at Fair Value $ 16,253 $ 9,550      
Fair Value As A Percentage of Member's Equity 47.00% 27.40%      
Construction & Engineering | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 3,539 $ 137      
Investment Owned, at Fair Value $ 3,539 $ 137      
Percent of net assets 1.20%   1.20%    
Data Processing & Outsourced Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 14,234 $ 14,969      
Investment Owned, at Fair Value $ 12,885 $ 14,659      
Fair Value As A Percentage of Member's Equity 37.20% 42.30%      
Data Processing & Outsourced Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 28,409 $ 34,137      
Investment Owned, at Fair Value $ 28,572 $ 33,997      
Percent of net assets 10.00% 10.80% 10.00% 10.80%  
Diversified Support Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 19,107 $ 19,246      
Investment Owned, at Fair Value $ 19,282 $ 19,136      
Fair Value As A Percentage of Member's Equity 55.70% 55.20%      
Diversified Support Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 9,559 $ 9,354      
Investment Owned, at Fair Value $ 9,414 $ 9,293      
Percent of net assets 3.30% 2.90% 3.30% 2.90%  
Electrical Components & Equipment          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 3,479        
Investment Owned, at Fair Value $ 3,479        
Fair Value As A Percentage of Member's Equity 10.10%        
Electronic Equipment & Instruments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 13,203      
Investment Owned, at Fair Value   $ 13,269      
Fair Value As A Percentage of Member's Equity   38.30%      
Environmental & Facilities Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 29,529 $ 19,632      
Investment Owned, at Fair Value $ 29,963 $ 19,691      
Fair Value As A Percentage of Member's Equity 86.60% 56.90%      
Environmental & Facilities Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 22,984      
Investment Owned, at Fair Value   $ 22,895      
Percent of net assets   7.20%   7.20%  
Health Care Facilities          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 7,944        
Investment Owned, at Fair Value $ 8,004        
Fair Value As A Percentage of Member's Equity 23.10%        
Health Care Facilities | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 8,694 $ 8,973      
Investment Owned, at Fair Value $ 8,660 $ 8,966      
Percent of net assets 3.00% 2.80% 3.00% 2.80%  
Health Care Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 4,898 $ 4,922      
Investment Owned, at Fair Value $ 4,995 $ 5,022      
Fair Value As A Percentage of Member's Equity 14.40% 14.50%      
Health Care Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 19,577 $ 17,577      
Investment Owned, at Fair Value $ 19,589 $ 17,643      
Percent of net assets 6.90% 5.50% 6.90% 5.50%  
Health Care Supplies          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 7,461 $ 7,500      
Investment Owned, at Fair Value $ 7,696 $ 7,530      
Fair Value As A Percentage of Member's Equity 22.20% 21.70%      
Health Care Supplies | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 20,142 $ 20,056      
Investment Owned, at Fair Value $ 19,535 $ 18,983      
Percent of net assets 6.80% 6.00% 6.80% 6.00%  
Household Appliances          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 7,649 $ 7,808      
Investment Owned, at Fair Value $ 7,632 $ 8,168      
Fair Value As A Percentage of Member's Equity 22.00% 23.60%      
Household Appliances | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 22,326 $ 22,088      
Investment Owned, at Fair Value $ 21,255 $ 21,397      
Percent of net assets 7.40% 6.80% 7.40% 6.80%  
Industrial Machinery & Supplies & Components          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 6,498      
Investment Owned, at Fair Value   $ 6,561      
Fair Value As A Percentage of Member's Equity   18.90%      
Industrial Machinery & Supplies & Components | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 12,124 $ 5,536      
Investment Owned, at Fair Value $ 12,225 $ 5,364      
Percent of net assets 4.30% 1.70% 4.30% 1.70%  
Investment Banking & Brokerage          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 4,958      
Investment Owned, at Fair Value   $ 4,977      
Fair Value As A Percentage of Member's Equity   14.40%      
Investment Banking & Brokerage | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 3,521      
Investment Owned, at Fair Value   $ 3,522      
Percent of net assets   1.10%   1.10%  
IT Consulting And Other Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 32,427 $ 50,974      
Investment Owned, at Fair Value $ 32,720 $ 51,295      
Fair Value As A Percentage of Member's Equity 94.60% 147.90%      
IT Consulting And Other Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 3,741      
Investment Owned, at Fair Value   $ 3,745      
Percent of net assets   1.20%   1.20%  
Leisure Products | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 45,674 $ 32,063      
Investment Owned, at Fair Value $ 23,298 $ 18,488      
Percent of net assets 8.10% 5.80% 8.10% 5.80%  
Packaged Foods & Meats          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 6,939 $ 6,904      
Investment Owned, at Fair Value $ 7,009 $ 6,904      
Fair Value As A Percentage of Member's Equity 20.20% 19.90%      
Packaged Foods & Meats | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 4,024        
Investment Owned, at Fair Value $ 4,087        
Percent of net assets 1.40%   1.40%    
Paper & Plastic Packaging Products & Materials          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 14,964 $ 14,939      
Investment Owned, at Fair Value $ 14,881 $ 14,913      
Fair Value As A Percentage of Member's Equity 43.20% 43.10%      
Personal Products          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 5,944      
Investment Owned, at Fair Value   $ 5,957      
Fair Value As A Percentage of Member's Equity   17.20%      
Pharmaceuticals          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 16,411 $ 16,523      
Investment Owned, at Fair Value $ 15,461 $ 16,416      
Fair Value As A Percentage of Member's Equity 44.70% 47.30%      
Real Estate Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 14,554 $ 20,540      
Investment Owned, at Fair Value $ 13,782 $ 19,256      
Fair Value As A Percentage of Member's Equity 39.80% 55.60%      
Research & Consulting Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 11,900 $ 15,815      
Investment Owned, at Fair Value $ 11,977 $ 16,149      
Fair Value As A Percentage of Member's Equity 34.60% 46.50%      
Research & Consulting Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 4,823 $ 8,166      
Investment Owned, at Fair Value $ 4,927 $ 8,143      
Percent of net assets 1.70% 2.50% 1.70% 2.50%  
Systems Software | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 16,573 $ 20,618      
Investment Owned, at Fair Value $ 17,267 $ 11,523      
Percent of net assets 5.90% 3.60% 5.90% 3.60%  
Technology Hardware, Storage & Peripherals          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 17,880 $ 18,811      
Investment Owned, at Fair Value $ 17,949 $ 18,853      
Fair Value As A Percentage of Member's Equity 51.80% 54.40%      
Technology Hardware, Storage & Peripherals | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 18,547 $ 16,808      
Investment Owned, at Fair Value $ 18,072 $ 16,745      
Percent of net assets 6.30% 5.30% 6.30% 5.30%  
Distributors          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 9,307        
Investment Owned, at Fair Value $ 9,372        
Fair Value As A Percentage of Member's Equity 27.10%        
Distributors | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 10,563 $ 15,946      
Investment Owned, at Fair Value $ 10,690 $ 12,475      
Percent of net assets 3.70% 3.90% 3.70% 3.90%  
Food Distributors          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember   srt:NorthAmericaMember    
Investment Owned, at Cost $ 4,919        
Investment Owned, at Fair Value $ 4,993        
Fair Value As A Percentage of Member's Equity 14.40%        
Wireless Telecommunication Services          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration] srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember srt:NorthAmericaMember  
Investment Owned, at Cost $ 6,256 $ 6,294      
Investment Owned, at Fair Value $ 6,332 $ 6,295      
Fair Value As A Percentage of Member's Equity 18.30% 18.20%      
Wireless Telecommunication Services | Debt Investments          
Schedule of Investments [Line Items]          
Investment, Issuer Geographic Region [Extensible Enumeration]   srt:NorthAmericaMember   srt:NorthAmericaMember  
Investment Owned, at Cost   $ 21,226      
Investment Owned, at Fair Value   $ 20,969      
Percent of net assets   6.60%   6.60%  
v3.25.1
INVESTMENTS - Superscript (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
STRS JV's portfolio company investments as a percentage of members' equity 224.40% 219.70%
Investments, fair value $ 642,213 $ 696,168
STRS JV    
Schedule of Investments [Line Items]    
STRS JV's portfolio company investments as a percentage of members' equity 852.30% 900.60%
STRS JV's portfolio company investments as a percentage of total assets 95.40% 94.00%
Outstanding commitments to fund investments $ 24,724 $ 21,063
Investments, fair value $ 294,957 $ 312,217
v3.25.1
INVESTMENTS - Forward Currency Contracts (Details)
€ in Thousands, £ in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
GBP (£)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
GBP (£)
Fair value                
Unrealized depreciation         $ (43)      
Foreign currency forward contracts                
Fair value                
Net Amount of Derivative Assets $ 20              
Unrealized depreciation         (43)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, CAD, Settlement Date 1/27/23                
Fair value                
Currency to be sold           $ 256    
Currency to be purchased         189      
Unrealized depreciation         (1)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, CAD, Settlement Date 2/7/2024                
Fair value                
Currency to be sold   $ 958            
Currency to be purchased 691              
Unrealized depreciation (33)              
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, EUR, Settlement Date 1/27/23                
Fair value                
Currency to be sold | €             € 1,111  
Currency to be purchased         1,128      
Unrealized depreciation         (64)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, EUR, Settlement Date 2/7/2024                
Fair value                
Currency to be sold | €     € 1,181          
Currency to be purchased 1,249              
Unrealized depreciation (56)              
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, GBP, Settlement Date 1/27/23                
Fair value                
Currency to be sold | £               £ 229
Currency to be purchased         266      
Unrealized depreciation         (10)      
Open Forward Foreign Currency Contract, Identifier [Axis]: Forward Currency Contracts, Morgan Stanley, GBP, Settlement Date 2/7/2024                
Fair value                
Currency to be sold | £       £ 1,340        
Currency to be purchased 1,625              
Unrealized depreciation (83)              
Morgan Stanley | CAD | Foreign currency forward contracts                
Fair value                
Net Amount of Derivative Assets 20              
Unrealized depreciation         (43)      
STRS JV                
Fair value                
Unrealized depreciation $ (172)       $ (75)      
v3.25.1
INVESTMENTS - Selected Balance Sheet Information For STRS JV (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets      
Investments, fair value $ 642,213 $ 696,168  
Cash and cash equivalents 12,424 10,749 $ 9,508
Total assets 676,821 730,751  
Liabilities      
Interest payable on credit facility 1,821 2,069  
Total liabilities 390,687 413,979  
Total liabilities and total net assets 676,821 730,751  
Investments, amortized cost 695,240 740,021  
Unamortized debt issuance costs 2,876 4,564  
STRS JV      
Assets      
Investments, fair value 294,957 312,217  
Cash and cash equivalents 12,454 14,625  
Interest receivable 1,427 2,540  
Amount receivable on unsettled investment transactions 143 2,687  
Unrealized appreciation on foreign currency forward contracts 64    
Other assets 32 91  
Total assets 309,077 332,160  
Liabilities      
Credit facility 141,057 163,394  
Note payable to members 128,459 128,459  
Interest payable on credit facility 807 1,013  
Interest payable on notes to members 3,589 3,799  
Unrealized depreciation on foreign currency forward contracts   172  
Other liabilities 558 657  
Total liabilities 274,470 297,494  
Members' equity 34,607 34,666  
Total liabilities and total net assets 309,077 332,160  
Investments, amortized cost 296,752 312,807  
Unamortized debt issuance costs $ 3,024 $ 1,850  
v3.25.1
INVESTMENTS - Selected Statement of Operations Information For STRS JV (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Total investment income $ 92,817 $ 103,260 $ 87,527
Administrative service fees 683 683 683
Net investment income after excise tax 37,238 42,713 37,258
Net increase (decrease) in net assets resulting from operations 10,851 20,412 15,683
STRS JV      
Schedule of Investments [Line Items]      
Interest and fee income 39,833 40,334 28,956
Total investment income 39,833 40,334 28,956
Interest expense on credit facility 14,433 14,558 7,470
Interest expense on notes to members 14,971 14,403 9,680
Administrative service fees 651 652 629
Other expenses 816 636 564
Total expenses, before fees waived 30,871 30,249 18,343
Net investment income after excise tax 8,962 10,085 10,613
Net realized gains (losses) on investments and foreign currency transactions 91 312 329
Net change in unrealized appreciation (depreciation) on investments and foreign currency transactions 1,329 1,229 (875)
Net increase (decrease) in net assets resulting from operations $ 10,382 $ 11,626 $ 10,067
v3.25.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 642,213 $ 696,168
First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 502,693 553,085
Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 8,342 19,039
Unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,175 167
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 22,846 16,679
Equity in STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 22,741 22,782
Level 1    
FAIR VALUE MEASUREMENTS    
Money Market Fair Value 13,249 11,312
Level 2 | Foreign currency forward contracts    
FAIR VALUE MEASUREMENTS    
Investments, fair value 20 43
Level 3    
FAIR VALUE MEASUREMENTS    
Investments, fair value 619,472 673,386
Level 3 | First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 502,693 553,085
Level 3 | Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 8,342 19,039
Level 3 | Unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,175 167
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 $ 22,846 $ 16,679
v3.25.1
FAIR VALUE MEASUREMENTS - Level 3 Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair value measurements    
Fair value, beginning of period $ 673,386 $ 740,068
Funding of investments 207,283 149,424
Non-cash interest income 7,260 5,738
Accretion of discount 4,111 4,493
Proceeds from paydowns and sales (244,746) (202,334)
Realized gains (losses) $ (18,688) $ (834)
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) $ (9,134) $ (23,169)
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 $ 619,472 $ 673,386
Change in unrealized appreciation (depreciation) on investments still held (27,059) (25,471)
First lien secured loans    
Fair value measurements    
Fair value, beginning of period 553,085 618,267
Funding of investments 206,830 143,792
Non-cash interest income 6,786 5,471
Accretion of discount 4,084 4,411
Proceeds from paydowns and sales (241,304) (195,496)
Conversions (8,852) (7,232)
Realized gains (losses) (10,985) (518)
Net unrealized appreciation (depreciation) (6,951) (15,610)
Fair value, end of period 502,693 553,085
Change in unrealized appreciation (depreciation) on investments still held (17,190) (17,346)
Second lien secured loans    
Fair value measurements    
Fair value, beginning of period 19,039 20,634
Non-cash interest income 380 267
Accretion of discount 22 82
Proceeds from paydowns and sales (2,039) (233)
Conversions (11,769) 2,695
Realized gains (losses) (5,817) 22
Net unrealized appreciation (depreciation) 8,526 (4,428)
Fair value, end of period 8,342 19,039
Change in unrealized appreciation (depreciation) on investments still held 259 (4,430)
Unsecured Loans    
Fair value measurements    
Fair value, beginning of period 167 167
Non-cash interest income 94  
Accretion of discount 5  
Conversions 886  
Net unrealized appreciation (depreciation) 23  
Fair value, end of period 1,175 167
Change in unrealized appreciation (depreciation) on investments still held 23  
Subordinated Note to STRS JV    
Fair value measurements    
Fair value, beginning of period 84,416 80,000
Funding of investments   4,416
Fair value, end of period 84,416 84,416
Equity (excluding STRS JV)    
Fair value measurements    
Fair value, beginning of period 16,679 21,000
Funding of investments 453 1,216
Proceeds from paydowns and sales (1,403) (6,605)
Conversions 19,735 4,537
Realized gains (losses) (1,886) (338)
Net unrealized appreciation (depreciation) (10,732) (3,131)
Fair value, end of period 22,846 16,679
Change in unrealized appreciation (depreciation) on investments still held $ (10,151) $ (3,694)
v3.25.1
FAIR VALUE MEASUREMENTS - Quantitative information (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 642,213 $ 696,168
First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 502,693 553,085
Second lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 8,342 19,039
Subordinated unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,175 167
Subordinated Notes    
FAIR VALUE MEASUREMENTS    
Investments, fair value 1,175 167
Subordinated Note to STRS JV    
FAIR VALUE MEASUREMENTS    
Investments, fair value 84,416 84,416
Level 3    
FAIR VALUE MEASUREMENTS    
Investments, fair value 619,472 673,386
Level 3 | First lien secured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value 502,693 553,085
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 $ 439,577 $ 507,946
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.077 0.110
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.268 0.303
Level 3 | First lien secured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.131 0.139
Level 3 | First lien secured loans | Option pricing model    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 74 $ 646
Level 3 | First lien secured loans | Option pricing model | Volatility | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.160 0.172
Level 3 | First lien secured loans | Option pricing model | Volatility | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.160 0.172
Level 3 | First lien secured loans | Option pricing model | Volatility | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.160 0.172
Level 3 | First lien secured loans | Recent transaction    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 19,554 $ 34,016
Level 3 | First lien secured loans | Recent transaction | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.980 0.890
Level 3 | First lien secured loans | Recent transaction | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 1.000 0.988
Level 3 | First lien secured loans | Recent transaction | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.985 96.2
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    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 10,477
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 22,923  
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.058 0.086
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.080 0.086
Level 3 | First lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.069 0.086
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,635  
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.014  
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.014  
Level 3 | First lien secured loans | Enterprise value analysis | Revenue Multiple | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 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 $ 8,342 $ 19,039
Level 3 | Second lien secured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 8,342 $ 17,438
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.117 0.114
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.125 0.240
Level 3 | Second lien secured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.120 0.188
Level 3 | Second lien secured loans | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 1,601
Level 3 | Second lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.063
Level 3 | Second lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.063
Level 3 | Second lien secured loans | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.063
Level 3 | Subordinated unsecured loans    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,175 $ 167
Level 3 | Subordinated unsecured loans | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 1,175  
Level 3 | Subordinated unsecured loans | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.126  
Level 3 | Subordinated unsecured loans | Discounted cash flows | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.123  
Level 3 | Subordinated unsecured loans | Discounted cash flows | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.129  
Level 3 | Subordinated unsecured loans | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 167
Level 3 | Subordinated unsecured loans | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.071
Level 3 | Subordinated unsecured loans | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.071
Level 3 | Subordinated unsecured loans | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.071
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 $ 2,916 $ 832
Level 3 | Preferred Equity | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.299
Level 3 | Preferred Equity | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.303
Level 3 | Preferred Equity | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.299
Level 3 | Preferred Equity | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 1,511
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.065 0.060
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.121 0.105
Level 3 | Preferred Equity | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.075 0.067
Level 3 | Common Equity | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 3,175
Level 3 | Common Equity | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.147
Level 3 | Common Equity | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.303
Level 3 | Common Equity | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.166
Level 3 | Common Equity | Recent transaction    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 709
Level 3 | Common Equity | Recent transaction | Transaction price | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.010
Level 3 | Common Equity | Recent transaction | Transaction price | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.010
Level 3 | Common Equity | Recent transaction | Transaction price | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.010
Level 3 | Common Equity | Enterprise value analysis    
FAIR VALUE MEASUREMENTS    
Investments, fair value   $ 6,927
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 10,728  
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.053 0.055
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.137 0.132
Level 3 | Common Equity | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.098 0.088
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 9,132  
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.014  
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.020  
Level 3 | Common Equity | Enterprise value analysis | Revenue Multiple | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.020  
Level 3 | Warrant | Discounted cash flows    
FAIR VALUE MEASUREMENTS    
Investments, fair value $ 70 $ 3,525
Level 3 | Warrant | Discounted cash flows | Discount rate | Minimum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.055 0.262
Level 3 | Warrant | Discounted cash flows | Discount rate | Maximum    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.055 0.302
Level 3 | Warrant | Discounted cash flows | Discount rate | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input   0.263
Level 3 | Warrant | Enterprise value analysis | EBITDA Multiple Range | Weighted average    
FAIR VALUE MEASUREMENTS    
Investments Owned, Measurement Input 0.055  
v3.25.1
FAIR VALUE MEASUREMENTS - Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Aug. 31, 2023
Aug. 24, 2023
Aug. 07, 2023
Dec. 06, 2021
Nov. 24, 2021
Dec. 04, 2020
Oct. 20, 2020
Jul. 13, 2018
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 355,993 $ 391,012                
Fair Value, Debt $ 348,576 $ 375,176                
6.000% 2023 Notes                    
FAIR VALUE MEASUREMENTS                    
Interest rate (as a percent)         6.00%         6.00%
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 | JPM Credit Facility                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 161,493 $ 196,512                
Fair Value, Debt 160,745 194,926                
Level 3 | 5.375% 2025 Notes                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding 40,000 40,000                
Fair Value, Debt $ 39,594 38,369                
Interest rate (as a percent) 5.375%                  
Level 3 | 5.375% 2026 Notes                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 10,000 10,000                
Fair Value, Debt $ 9,765 9,365                
Interest rate (as a percent) 5.375%                  
Level 3 | 4.000% 2026 Notes                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 75,000 75,000                
Fair Value, Debt $ 71,342 67,511                
Interest rate (as a percent) 4.00%                  
Level 3 | 5.625% 2027 Notes                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 10,000 10,000                
Fair Value, Debt $ 9,719 9,261                
Interest rate (as a percent) 5.625%                  
Level 3 | 4.250% 2028 Notes                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 25,000 25,000                
Fair Value, Debt $ 22,911 21,379                
Interest rate (as a percent) 4.25%                  
Level 3 | 7.875% 2028 Notes                    
FAIR VALUE MEASUREMENTS                    
Principal Amount Outstanding $ 34,500 34,500                
Fair Value, Debt $ 34,500 $ 34,365                
Interest rate (as a percent) 7.875%                  
v3.25.1
BORROWINGS - Outstanding and Available (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 04, 2022
Dec. 31, 2024
Dec. 31, 2023
Aug. 31, 2023
Aug. 24, 2023
Aug. 07, 2023
Mar. 30, 2022
Mar. 29, 2022
Feb. 03, 2022
Dec. 06, 2021
Nov. 24, 2021
Dec. 04, 2020
Oct. 20, 2020
Jul. 13, 2018
Debt Instrument                            
Principal Amount Outstanding   $ 355,993 $ 391,012                      
Amortized Cost   353,117 386,448                      
Available   173,507 138,488                      
JPM Credit Facility                            
Debt Instrument                            
Principal Amount Outstanding   161,493 196,512                      
Amortized Cost   160,745 194,926                      
Available $ 310,000 $ 173,507 $ 138,488       $ 335,000 $ 310,000 $ 285,000          
Variable interest rate (as a percent) 2.50%                          
JPM Credit Facility | SOFR                            
Debt Instrument                            
Variable interest rate (as a percent)   2.50% 2.50%                      
6.000% 2023 Notes                            
Debt Instrument                            
Principal Amount Outstanding                           $ 30,000
Interest rate (as a percent)           6.00%               6.00%
5.375% 2025 Notes                            
Debt Instrument                            
Principal Amount Outstanding   $ 40,000 $ 40,000                   $ 40,000  
Amortized Cost   $ 39,892 $ 39,761                      
Variable interest rate (as a percent)   5.375% 5.375%                      
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   $ 9,943 $ 9,914                      
Variable interest rate (as a percent)   5.375% 5.375%                      
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   $ 74,332 $ 73,992                      
Variable interest rate (as a percent)   4.00% 4.00%                      
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   $ 9,926 $ 9,901                      
Variable interest rate (as a percent)   5.625% 5.625%                      
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   $ 24,796 $ 24,745                      
Variable interest rate (as a percent)   4.25% 4.25%                      
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   $ 33,483 $ 33,209                      
Variable interest rate (as a percent)   7.875% 7.875%                      
Interest rate (as a percent)   7.875% 7.875% 7.875% 7.875%                  
v3.25.1
BORROWINGS - Narratives (Details)
$ in Thousands
 12 Months Ended
Apr. 12, 2023
Feb. 04, 2022
USD ($)
Jan. 04, 2022
USD ($)
Jan. 01, 2018
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 30, 2022
USD ($)
Mar. 29, 2022
USD ($)
Feb. 03, 2022
USD ($)
Debt Instrument                  
Percentage of asset coverage for borrowed amounts         180.40% 181.00%      
Available         $ 173,507 $ 138,488      
Principal Amount Outstanding         $ 355,993 391,012      
Minimum                  
Debt Instrument                  
Asset coverage ratio       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   $ 25,000 $ 335,000            
Variable interest rate (as a percent)   2.50%              
Available   $ 310,000     $ 173,507 138,488 $ 335,000 $ 310,000 $ 285,000
Maximum borrowing limit   335,000              
Minimum funding amount contingent   217,000         234,500 $ 217,000 $ 200,000
Commitment Fee (as a percent)         0.75%        
Minimum borrowing capacity         $ 234,500        
Fair value of securities pledged as collateral         512,210        
Principal Amount Outstanding         161,493 196,512      
Amount undrawn under the credit facility         173,507 138,488      
Weighted average outstanding borrowings         $ 183,014 $ 236,969      
Interest rate over time         7.67% 7.58%      
Effective interest rate (as a percent)         6.88% 7.87%      
Increase in credit facility size   25,000              
Permanent increase in availability   $ 25,000              
JPM Credit Facility | Maximum                  
Debt Instrument                  
Maximum borrowing limit             $ 375,000    
JPM Credit Facility | SOFR                  
Debt Instrument                  
Variable interest rate (as a percent)         2.50% 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)         2.35%        
v3.25.1
BORROWINGS - Notes (Details) - USD ($)
$ in Thousands
Aug. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Aug. 24, 2023
Aug. 07, 2023
Dec. 06, 2021
Nov. 24, 2021
Dec. 04, 2020
Oct. 20, 2020
Jul. 13, 2018
Debt Instrument                    
Principal Amount Outstanding   $ 355,993 $ 391,012              
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            
6.000% 2023 Notes                    
Debt Instrument                    
Interest rate (as a percent)         6.00%         6.00%
Principal Amount Outstanding                   $ 30,000
6.000% 2023 Notes | Maximum                    
Debt Instrument                    
Interest rate (as a percent)                   6.50%
v3.25.1
RELATED PARTY TRANSACTIONS - (Details) - Investment Advisory Agreement - item
 12 Months Ended
Jan. 01, 2024
Dec. 31, 2024
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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
RELATED PARTY TRANSACTIONS      
Base management fees $ 12,127 $ 14,684 $ 15,600
Total management fees 12,127 14,684 $ 15,600
Management fees payable $ 2,932 $ 3,595  
v3.25.1
RELATED PARTY TRANSACTIONS - Performance-based incentive fee (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
component
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
RELATED PARTY TRANSACTIONS      
Number of components | component 2    
Incentive fee payables $ 17,848 $ 10,470  
Income incentive fee 9,309 10,678 $ 8,862
Capital gains incentive fee     (1,803)
Total performance-based incentive fees 9,309 10,678 $ 7,059
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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
RELATED PARTY TRANSACTIONS      
Administrative service fees $ 683 $ 683 $ 683
Net realized losses $ (17,993) (30) (13,958)
Administration Agreement      
RELATED PARTY TRANSACTIONS      
Agreement may be terminated by either party without penalty upon days 60 days    
Administrative service fees $ 683 683 $ 683
Administration Agreement | White Horse Advisers      
RELATED PARTY TRANSACTIONS      
Other liabilities 5,890,052 4,977,275  
Administration Agreement | STRS JV      
RELATED PARTY TRANSACTIONS      
Proceeds from sale of investments 59,190 74,939  
Net realized losses $ (15) $ (101)  
v3.25.1
COMMITMENTS AND CONTINGENCIES - Unfunded commitments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Unfunded commitments    
Total Unfunded Commitments $ 26,385 $ 21,440
Revolving Loan Commitments    
Unfunded commitments    
Total Unfunded Commitments 15,510 12,113
Revolving Loan Commitments | Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)    
Unfunded commitments    
Total Unfunded Commitments   447
Revolving Loan Commitments | Branford Filtration, LLC (d/b/a Clean Solutions Group)    
Unfunded commitments    
Total Unfunded Commitments   387
Revolving Loan Commitments | Bridgepoint Healthcare, LLC    
Unfunded commitments    
Total Unfunded Commitments 1,350 1,588
Revolving Loan Commitments | BUSA Acquisition Co. (d/b/a BankCard USA Merchant Services Inc.)    
Unfunded commitments    
Total Unfunded Commitments 459  
Revolving Loan Commitments | Claridge Products and Equipment, LLC    
Unfunded commitments    
Total Unfunded Commitments 70 351
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 | Gulf Winds International Acquisition, LLC (d/b/a Gulf Winds International, Inc.)    
Unfunded commitments    
Total Unfunded Commitments 194 647
Revolving Loan Commitments | HC Salon Holdings, Inc. (d/b/a Hair Cuttery)    
Unfunded commitments    
Total Unfunded Commitments   700
Revolving Loan Commitments | Leviathan Intermediate Holdco, LLC (d/b/a Unleashed Brands Group)    
Unfunded commitments    
Total Unfunded Commitments 570 570
Revolving Loan Commitments | LogicMonitor, Inc.    
Unfunded commitments    
Total Unfunded Commitments 778  
Revolving Loan Commitments | Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)    
Unfunded commitments    
Total Unfunded Commitments 246 572
Revolving Loan Commitments | Motivational Marketing, LLC (d/b/a Motivational Fulfillment)    
Unfunded commitments    
Total Unfunded Commitments   709
Revolving Loan Commitments | MSI Information Services, Inc.    
Unfunded commitments    
Total Unfunded Commitments   225
Revolving Loan Commitments | M&M OpCo. LLC (d/b/a Escalent, Inc.)    
Unfunded commitments    
Total Unfunded Commitments 238 238
Revolving Loan Commitments | Naviga Inc. (f/k/a Newscycle Solutions, Inc.)    
Unfunded commitments    
Total Unfunded Commitments   30
Revolving Loan Commitments | PANOS Brands, LLC    
Unfunded commitments    
Total Unfunded Commitments 384  
Revolving Loan Commitments | Ribbon Communications Operating Company, Inc. (d/b/a Ribbon Communications Inc.)    
Unfunded commitments    
Total Unfunded Commitments 880  
Revolving Loan Commitments | Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)    
Unfunded commitments    
Total Unfunded Commitments 861 610
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 87
Revolving Loan Commitments | The Kyjen Company, LLC (d/b/a Outward Hound)    
Unfunded commitments    
Total Unfunded Commitments   798
Revolving Loan Commitments | TOT Group, Inc. (d/b/a Netevia Group LLC)    
Unfunded commitments    
Total Unfunded Commitments 553  
Revolving Loan Commitments | W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)    
Unfunded commitments    
Total Unfunded Commitments 515  
Revolving Loan Commitments | W Electric Intermediate Holdings, LLC (d/b/a Westinghouse Electric Corporation)    
Unfunded commitments    
Total Unfunded Commitments 1,195  
Revolving Loan Commitments | Zephyr Buyer, L.P. (d/b/a The Weather Company, LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,806  
Revolving Loan Commitments | Trailhead Media LLC    
Unfunded commitments    
Total Unfunded Commitments 870  
Delayed Draw Loan Commitments    
Unfunded commitments    
Total Unfunded Commitments 10,875 9,327
Delayed Draw Loan Commitments | Barrett Purchaser LLC (d/b/a SIB Development and Consulting, Inc.)    
Unfunded commitments    
Total Unfunded Commitments   895
Delayed Draw Loan Commitments | Midwest Texas Tea CA, LLC (d/b/a US Petroleum Partners, LLC)    
Unfunded commitments    
Total Unfunded Commitments   648
Delayed Draw Loan Commitments | Salon Republic Holdings, LLC (d/b/a Salon Republic, LLC)    
Unfunded commitments    
Total Unfunded Commitments 861 1,407
Delayed Draw Loan Commitments | Surge Amuze Holdings Inc. (d/b/a Amuze Products II, Inc.)    
Unfunded commitments    
Total Unfunded Commitments 878  
Delayed Draw Loan Commitments | TOT Group, Inc. (d/b/a Netevia Group LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,107  
Delayed Draw Loan Commitments | W&A Intermediate Co., LLC (d/b/a Wakefield & Associates, LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,288  
Delayed Draw Loan Commitments | Arcserve Cayman Opco LP (d/b/a Arcserve (USA), LLC)    
Unfunded commitments    
Total Unfunded Commitments 1,422  
Delayed Draw Loan Commitments | Avision Holdings, LLC (d/b/a Avision Sales Group)    
Unfunded commitments    
Total Unfunded Commitments 1,756  
Delayed Draw Loan Commitments | Banner Acquisition Holdings, LLC (d/b/a Banner Industries, Inc.)    
Unfunded commitments    
Total Unfunded Commitments   140
Delayed Draw Loan Commitments | StoicLane MidCo, LLC (d/b/a StoicLane Inc.)    
Unfunded commitments    
Total Unfunded Commitments   $ 6,237
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 $ 1,389  
v3.25.1
COMMITMENTS AND CONTINGENCIES - Additional information (Details) - STRS JV - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
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
 1 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Subsidiary, Sale of Stock        
Aggregate offering amount       $ 125
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 ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Per share data:          
Net asset value, beginning of period $ 13.63 $ 14.30 $ 15.10 $ 15.23 $ 15.23
Investment operations:          
Net investment income 1.60 1.84 1.60 1.36 1.18
Net realized and unrealized gains (losses) on investments and foreign currency transactions (1.13) (0.96) (0.93) 0.07 0.37
Net increase in net assets resulting from operations 0.47 0.88 0.67 1.43 1.55
Distributions declared from net investment income (1.79) (1.55) (1.47) (1.56) (1.55)
Net asset value, end of period $ 12.31 $ 13.63 $ 14.30 $ 15.10 $ 15.23
Total annualized return based on market value (21.30%) (5.75%) (15.81%) 13.89% (0.66%)
Total annualized return based on net asset value 3.49% 6.20% 4.55% 9.21% 10.36%
Net assets, end of period $ 286,134 $ 316,772 $ 332,387 $ 349,751 $ 312,897
Per share market value at end of period $ 9.68 $ 12.30 $ 13.05 $ 15.50 $ 13.61
Shares outstanding end of period 23,243,088 23,243,088 23,243,088 23,162,667 20,546,032
Ratios/Supplemental Data:          
Ratio of expenses before incentive fees to average net assets 14.89% 15.16% 12.54% 10.96% 9.78%
Ratio of incentive fees to average net assets 2.99% 3.25% 2.04% 2.30% 2.49%
Ratio of total expenses to average net assets 17.88% 18.41% 14.58% 13.26% 12.27%
Ratio of net investment income to average net assets 11.98% 12.98% 10.81% 8.81% 7.90%
Portfolio turnover ratio 30.93% 19.91% 35.81% 60.79% 35.86%
v3.25.1
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
CHANGE IN NET ASSETS RESULTING FROM OPERATIONS PER COMMON SHARE      
Net increase (decrease) in net assets resulting from operations $ 10,851 $ 20,412 $ 15,683
Weighted average shares outstanding, basic 23,243,088 23,243,088 23,229,552
Weighted average shares outstanding, diluted 23,243,088 23,243,088 23,229,552
Basic per share net increase (decrease) in net assets resulting from operations $ 0.47 $ 0.88 $ 0.68
Diluted per share net increase (decrease) in net assets resulting from operations $ 0.47 $ 0.88 $ 0.68
v3.25.1
INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
INCOME TAXES      
Provision for federal income tax $ 0    
Percentage of taxable income distributed 100.00%    
Late year ordinary losses $ 0 $ 0 $ 0
Long-term capital loss carryforwards 22,269 8,123  
Short-term capital loss carryforwards 5,666 0  
Cost of investments for U.S. federal income tax purpose 711,668 751,117  
Net unrealized depreciation 56,206 54,949  
Gross unrealized appreciation of investments 13,700 6,881  
Gross unrealized depreciation of investments $ 69,906 $ 61,830  
v3.25.1
INCOME TAXES - Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
INCOME TAXES      
Net increase (decrease) in net assets resulting from operations $ 10,851 $ 20,412 $ 15,683
Change in net unrealized (appreciation) depreciation on investments and foreign currency 8,406 23,247 7,307
Other book-to-tax differences 18,089 205 9,498
Taxable income before deductions for distributions $ 37,346 $ 43,864 $ 32,488
v3.25.1
INCOME TAXES - Distribution (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Amount      
Ordinary income $ 41,489 $ 36,027 $ 34,150
Total distributions $ 41,489 $ 36,027 $ 34,150
Percentage      
Ordinary income (as a percent) 100.00% 100.00% 100.00%
Total distributions (as a percent) 100.00% 100.00% 100.00%
v3.25.1
INCOME TAXES - Tax basis components of distributable earnings (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
INCOME TAXES      
Ordinary income $ 28,366 $ 31,874 $ 24,217
Accumulated capital and other losses (27,935)    
Net unrealized (depreciation) appreciation on investments and foreign currency (54,509) (54,020) (22,287)
Total (accumulated deficit) distributable earnings - tax basis $ (54,078) $ (22,146) $ 1,930
v3.25.1
SUBSEQUENT EVENTS - (Details)
Jan. 17, 2025
Subsequent Event | JPM Credit Facility  
Subsequent Event [Line Items]  
Interest rate for credit facility 2.25%