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Note 1 - Summary of Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
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 |  |
Allowance for credit losses on off-balance sheet credit exposures |  | 798 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 16,215 |  |
Allowance for credit losses on off-balance sheet credit exposures |  | 1,071 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 518 | $ 518 | $ 0
Allowance for credit losses on off-balance sheet credit exposures |  | $ 273 |  |

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