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Note 2 - Basis of Presentation and Summary of Significant Accounting Policies - Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Jan. 01, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Allowance for credit losses on loans | $ 41,903 | $ 41,076 |  | $ 32,912 | $ 29,337 | [1]
Net deferred tax assets | 15,765 | 16,977 |  | 4,855 |  |
Reserve for unfunded commitments | 640 | 1,157 |  | 1,203 |  |
Retained earnings, net of tax | $ 255,152 | 225,883 |  | 181,329 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Allowance for credit losses on loans |  |  | $ 35,047 |  |  |
Net deferred tax assets |  |  | 5,832 |  |  |
Reserve for unfunded commitments |  |  | 2,248 |  |  |
Retained earnings, net of tax |  |  | 179,125 |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Allowance for credit losses on loans |  | 0 | 2,135 | 2,135 | 0 |
Net deferred tax assets |  |  | 977 |  |  |
Reserve for unfunded commitments |  |  | 1,045 |  |  |
Retained earnings, net of tax |  |  | $ (2,204) |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |  |
Allowance for credit losses on loans |  | $ 41,076 |  | $ 35,047 | $ 29,337 |
[1] | Reserve was under the ALL method in accordance with ASC 450 and ASC 310.

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