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Note 6 - Fair Values of Assets and Liabilities (Details Textual) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Aggregate Unpaid Principal Balance of Loans Receivable at Fair Value | $ 2,420 | $ 2,096

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- Definition Amount of aggregate unpaid principal balance of loans receivable at fair value. + References No definition available. + Details
Name: | atlc_AggregateUnpaidPrincipalBalanceOfLoansReceivableAtFairValue
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant