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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
Document Information [Line Items]      
Entity Central Index Key 0001464343    
Entity Registrant Name Atlanticus Holdings Corp    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Document Type 10-K    
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     $ 133,800,000
Entity Common Stock, Shares Outstanding   15,115,344  
Auditor Name Deloitte & Touche LLP    
Auditor Location Atlanta, GA    
Auditor Firm ID 34    
Senior Notes Due in 2029 [Member[      
Document Information [Line Items]      
Title of 12(b) Security 9.25% Senior Notes due 2029    
Trading Symbol ATLCZ    
Security Exchange Name NASDAQ    
Senior Notes Due in 2026 [Member]      
Document Information [Line Items]      
Title of 12(b) Security 6.125% Senior Notes due 2026    
Trading Symbol ATLCL    
Security Exchange Name NASDAQ    
Series B Preferred Stock [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    
Common Stock [Member]      
Document Information [Line Items]      
Title of 12(b) Security Common stock, no par value per share    
Trading Symbol ATLC    
Security Exchange Name NASDAQ