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Note 6 - Fair Values of Assets and Liabilities (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Option, Credit Risk, Gains (Losses) on Assets	$ 14.3	$ (10.5)
Aggregate Unpaid Principal Balance of Loans Receivable at Fair Value	$ 2,473.0	$ 2,177.0

X

- 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

X

- Definition

This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-30

+ Details

Name:	us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration