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Note 15 - ATM Program (Details Textual)	Aug. 10, 2022 USD ($)
Series B Preferred Stock [Member] | Maximum [Member]
Preferred Stock, Aggregate Offering Price	$ 100,000,000

X

- Definition

Represents the aggregate offering price for preferred stock.

+ References

No definition available.

+ Details

Name:	atlc_PreferredStockAggregateOfferingPrice
Namespace Prefix:	atlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: