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Note 6 - Fair Values of Assets and Liabilities - Summary of Other Relevant Data (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loans, interest and fees receivable, at fair value | $ 1,026,424 | $ 417,098
Loans and Fees Receivable at Fair Value [Member] |  |
Aggregate unpaid gross balance of loans, interest and fees receivable that are reported at fair value | 1,249 | 630
Aggregate unpaid principal balance included within loans, interest and fees receivable that are reported at fair value | 1,204 | 589
Loans, interest and fees receivable, at fair value | 1,215 | 540
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | 8 | 1
Unpaid principal balance of receivables within loans, interest and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans, interest and fees receivable | 13 | 4
Loans and Fees Receivable Pledged as Collateral, Fair Value [Member] |  |
Aggregate unpaid gross balance of loans, interest and fees receivable that are reported at fair value | 1,234,039 | 515,434
Aggregate unpaid principal balance included within loans, interest and fees receivable that are reported at fair value | 1,131,895 | 487,779
Loans, interest and fees receivable, at fair value | 1,025,209 | 416,558
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | 4,640 | 1,847
Unpaid principal balance of receivables within loans, interest and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans, interest and fees receivable | $ 59,656 | 12,972
Structured Financing Notes Payable [Member] |  |
Aggregate unpaid principal balance included within loans, interest and fees receivable that are reported at fair value |  | 101,314
Aggregate fair value of notes payable |  | $ 2,919

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- Definition This item represents the aggregate gross balance within loans and fees receivables that are reported at fair value for which the fair value option has been elected. + References No definition available. + Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate unpaid principal balance within loans and fees receivables that are reported at fair value for which the fair value option has been elected. + References No definition available. + Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This item represents the aggregate fair value of notes payable for which the fair value option has been elected. + References No definition available. + Details
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Namespace Prefix: | atlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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Period Type: | instant

X
- Definition For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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