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Note 17 - Subsequent Events (Details Textual) - Class B Preferred Units [Member] - $ / shares shares in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Preferred Units, Shares, Redeemed During Period (in shares)		50.5
Preferred Units, Redemption Price Per Unit (in dollars per share)		$ 1
Subsequent Event [Member]
Preferred Units, Shares, Redeemed During Period (in shares)	50.0
Preferred Units, Redemption Price Per Unit (in dollars per share)	$ 1

X

- Definition

Redemption price per unit for preferred units.

+ References

No definition available.

+ Details

Name:	atlc_PreferredUnitsRedemptionPricePerUnit
Namespace Prefix:	atlc_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of preferred units redeemed during a period of time.

+ References

No definition available.

+ Details

Name:	atlc_PreferredUnitsSharesRedeemedDuringPeriod
Namespace Prefix:	atlc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PreferredUnitsByNameAxis=atlc_ClassBPreferredUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: