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Note 5 - Investment in Equity-method Investee (Details Textual)	Mar. 31, 2022
Equity Method Investment to Acquire Portfolio of Credit Card Receivables [Member]
Equity Method Investment, Ownership Percentage	66.70%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=atlc_EquityMethodInvestmentToAcquirePortfolioOfCreditCardReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: