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Note 10 - Notes Payable - Schedule of Structured Financing Notes Payable (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Securitization facility (repaid in December 2021), outstanding face amount of $101.3 million as of December 31, 2020 bearing interest at a weighted average 5.7% interest rate, based upon LIBOR which was secured by credit card receivables and restricted cash aggregating $2.9 million as of December 31, 2020 in carrying amount | $ 0 | $ 2,919
Securitization Financing Facility [Member] |  |
Securitization facility (repaid in December 2021), outstanding face amount of $101.3 million as of December 31, 2020 bearing interest at a weighted average 5.7% interest rate, based upon LIBOR which was secured by credit card receivables and restricted cash aggregating $2.9 million as of December 31, 2020 in carrying amount |  | $ 2,900

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- Definition Debt that reflects the fair value of the consolidation of our securitization trusts presenting certain non-recourse, asset-backed structured financing debt facilities that are secured by these credit card receivables that are held within such trusts. + References No definition available. + Details
Name: | atlc_NotesPayableAssociatedWithStructuredFinancingsFairValue
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=atlc_SecuritizationFinancingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |