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Note 6 - Fair Values of Assets and Liabilities (Details Textual) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
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