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Note 8 - Leases (Details Textual) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Aug. 31, 2021 USD ($) ft²
Operating Leases, Options to Extend for Additional Periods, Revolving Periods (Year) | 1 year |
Operating Lease in Atlanta, Georgia [Member] |  |
Area of Real Estate Property (Square Foot) | ft² |  | 73,000
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Month) |  | 146 months
Lessee, Operating Lease, Lease Not yet Commenced, Commitment | $ |  | $ 27.8
Minimum [Member] |  |
Lessee, Operating Lease, Term of Contract (Year) | 1 year |
Maximum [Member] |  |
Lessee, Operating Lease, Term of Contract (Year) | 6 years |

X
- Definition The amount of commitment of lessee's operating lease that has not yet commenced. Including, but not limited to, nature of involvement with construction or design of underlying asset for lease. + References No definition available. + Details
Name: | atlc_LesseeOperatingLeaseLeaseNotYetCommencedCommitment
Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the duration of the revolving periods that generally apply to options to extend some, but not necessarily all, operating leases for additional periods. + References No definition available. + Details
Name: | atlc_OperatingLeasesOptionsToExtendForAdditionalPeriodsRevolvingPeriods
Namespace Prefix: | atlc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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Period Type: | instant

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=atlc_OperatingLeaseInAtlantaGeorgiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Period Type: |