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Note 1 - Summary of Significant Accounting Policies - Impact of ASC 326 (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Allowance for credit loss | $ 17,058 | $ 16,776 |  | $ 15,697
Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit loss |  |  | $ 15,697 |
Allowance for credit losses on off-balance sheet credit exposures |  |  | 798 |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit loss |  |  | 16,215 |
Allowance for credit losses on off-balance sheet credit exposures |  |  | 1,071 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |
Allowance for credit loss |  | $ 0 | 518 | $ 518
Allowance for credit losses on off-balance sheet credit exposures |  |  | $ 273 |

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