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Document And Entity Information - USD ($) $ in Millions	12 Months Ended
Document And Entity Information - USD ($) $ in Millions	Dec. 31, 2024	Feb. 21, 2025	Jun. 30, 2024
Document Information [Line Items]
Entity, Registrant Name	ATLANTICUS HOLDINGS CORPORATION
Current Fiscal Year End Date	--12-31
Document, Fiscal Period Focus	FY
Document, Fiscal Year Focus	2024
Document, Type	10-K/A
Document, Annual Report	true
Document, Period End Date	Dec. 31, 2024
Document, Transition Report	false
Entity, Incorporation, State or Country Code	GA
Entity, Tax Identification Number	58-2336689
Entity, File Number	0-53717
Entity, Address, Address Line One	Five Concourse Parkway, Suite 300
Entity, Address, City or Town	Atlanta
Entity, Address, State or Province	GA
Entity, Address, Postal Zip Code	30328
City Area Code	770
Local Phone Number	828-2000
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	true
Entity, Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document, Financial Statement Error Correction Flag	true
Document, Financial Statement Restatement Recovery Analysis Flag	false
Entity, Shell Company	false
Entity, Public Float			$ 133.8
Entity, Common Stock Shares, Outstanding		15,115,344
Amendment Description	This Amendment No. 1 on Form 10-K/A (this “Amendment”) amends the original Annual Report on Form 10-K for the year ended December 31, 2024 filed on March 13, 2025 (the “Original Form 10-K”) by Atlanticus Holdings Corporation (the “Company”, “Atlanticus Holdings Corporation”, “Atlanticus”, “we”, “our”, “ours” and “us”) with the U.S. Securities and Exchange Commission (the “SEC”). This Amendment does not change our consolidated financial statements as set forth in the Original Form 10-K. The purpose of this Amendment is to amend and restate Part II, Item 7 Management’s Discussion and Analysis of Financial Condition and Results of Operations (the “MD&A”) in order to include a paragraph that was inadvertently omitted from the Original Form 10-K by our financial printing and EDGAR filing service provider. Specifically, the MD&A herein includes a new first paragraph under “Consolidated Results of Operations—Year Ended December 31, 2024 Compared to Year Ended December 31, 2023—Changes in fair value of loans.” This Amendment does not include any other changes to the Original Form 10-K. Other than the change described above, this Amendment speaks only as of the date of the Original Form 10-K and does not modify or update any other disclosures contained in our Original Form 10-K for other events or information subsequent to the date of the filing of the Original Form 10-K. Specifically, there are no changes to our consolidated financial statements set forth in the Original Form 10-K. This Amendment should be read in conjunction with the Original Form 10-K and reports filed with the SEC subsequent to the Original Form 10-K.
Amendment Flag	true
Entity, Central Index Key	0001464343
CommonStockNoParValuePerShare Custom [Member]
Document Information [Line Items]
Title of 12(b) Security	Common stock, no par value per share
Trading Symbol	ATLC
Security Exchange Name	NASDAQ
SeriesBCumulativePerpetualPreferredStockNoParValuePerShare7625 Custom [Member]
Document Information [Line Items]
Title of 12(b) Security	7.625% Series B Cumulative Perpetual Preferred Stock, no par value per share
Trading Symbol	ATLCP
Security Exchange Name	NASDAQ
SeniorNotesDue20266125 Custom [Member]
Document Information [Line Items]
Title of 12(b) Security	6.125% Senior Notes due 2026
Trading Symbol	ATLCL
Security Exchange Name	NASDAQ
SeniorNotesDue2029925 Custom [Member]
Document Information [Line Items]
Title of 12(b) Security	9.25% Senior Notes due 2029
Trading Symbol	ATLCZ
Security Exchange Name	NASDAQ