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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 01, 2023 USD ($) | Dec. 31, 2021 USD ($)
Number of Operating Segments | 1 |  |  |
Time Deposit, Maturity | 6 years |  |  |
Goodwill, Impairment Loss | $ 0 | $ 0 |  |
Retained Earnings (Accumulated Deficit) | 180,438 | 179,931 |  |
Deferred income taxes, net | 16,496 | 22,130 |  |
Financing Receivable, Allowance for Credit Loss | $ 16,776 | 15,697 |  | $ 16,621
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 taxes, net |  |  | 188 |
Financing Receivable, Allowance for Credit Loss |  | $ 518 | 518 | $ 0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | OBS Credit Exposures [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | $ 273 |
Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |  |
Building [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |  |
Building [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |
Accrued Interest Receivable [Member] |  |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | $ 3,500 |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | $ 9,400 |  |  |

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