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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
		Dec. 31, 2023	Dec. 31, 2022
Revenue from contracts with customers		$ 37,348	$ 42,798
Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	21,453	24,926
Servicing Income [Member]
Revenue from contracts with customers		4,089	4,147
Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		11,806	13,725
Credit and Other Investments [Member]
Revenue from contracts with customers		36,524	41,843
Credit and Other Investments [Member] | Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	21,453	24,926
Credit and Other Investments [Member] | Servicing Income [Member]
Revenue from contracts with customers		3,340	3,259
Credit and Other Investments [Member] | Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		11,731	13,658
Auto Finance [Member]
Revenue from contracts with customers		824	955
Auto Finance [Member] | Credit and Debit Card [Member]
Revenue from contracts with customers	[1]	0	0
Auto Finance [Member] | Servicing Income [Member]
Revenue from contracts with customers		749	888
Auto Finance [Member] | Service Charges and Other Customer Related Fees [Member]
Revenue from contracts with customers		$ 75	$ 67
[1] Interchange revenue is presented net of customer reward expense.

X

- 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
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-Name Accounting Standards Codification
-Section S99
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-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
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-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
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-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
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-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
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Section 50
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-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
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 41
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

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