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Note 1 - Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | ---
Retained Earnings (Accumulated Deficit) | $ 180,724 |  |  | $ 179,931 |  |  |
Deferred Income Tax Assets, Net | 23,206 |  |  | 22,130 |  |  |
Financing Receivable, Allowance for Credit Loss | 16,118 | $ 16,319 |  | 15,697 | $ 15,897 | $ 16,420 | $ 16,621
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | 4,100 |  |  |  |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | $ 9,700 |  |  |  |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | $ 15,697 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  | (603) |  |  |  |
Deferred Income Tax Assets, Net |  |  | 188 |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 518 | $ 518 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | OBS Credit Exposures [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | $ 273 |  |  |  |

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