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Note 8 - Leases (Details Textual) - Operating Lease in Atlanta, Georgia [Member] $ in Millions | Sep. 30, 2024 USD ($) | Aug. 31, 2021 ft²
--- | --- | ---
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 | $ | $ 25.1 |

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 Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
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 -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
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: |