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Note 2 - Significant Accounting Policies and Consolidated Financial Statement Components - Components of Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue from contracts with customers |  | $ 42,798 | $ 30,606 | $ 15,431
Credit and Debit Card [Member] |  |  |  |
Revenue from contracts with customers | [1] | 24,926 | 18,134 | 9,500
Servicing Income [Member] |  |  |  |
Revenue from contracts with customers |  | 4,147 | 3,095 | 2,181
Service Charges and Other Customer Related Fees [Member] |  |  |  |
Revenue from contracts with customers |  | 13,725 | 9,377 | 3,750
Credit and Other Investments [Member] |  |  |  |
Revenue from contracts with customers |  | 41,843 | 29,322 | 14,372
Credit and Other Investments [Member] | Credit and Debit Card [Member] |  |  |  |
Revenue from contracts with customers | [1] | 24,926 | 18,134 | 9,500
Credit and Other Investments [Member] | Servicing Income [Member] |  |  |  |
Revenue from contracts with customers |  | 3,259 | 1,871 | 1,187
Credit and Other Investments [Member] | Service Charges and Other Customer Related Fees [Member] |  |  |  |
Revenue from contracts with customers |  | 13,658 | 9,317 | 3,685
Auto Finance [Member] |  |  |  |
Revenue from contracts with customers |  | 955 | 1,284 | 1,059
Auto Finance [Member] | Credit and Debit Card [Member] |  |  |  |
Revenue from contracts with customers | [1] | 0 | 0 | 0
Auto Finance [Member] | Servicing Income [Member] |  |  |  |
Revenue from contracts with customers |  | 888 | 1,224 | 994
Auto Finance [Member] | Service Charges and Other Customer Related Fees [Member] |  |  |  |
Revenue from contracts with customers |  | $ 67 | $ 60 | $ 65
[1] | Interchange revenue is presented net of customer reward expense.

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-42 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-40 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-32 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-4 + Details
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