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Note 9 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2021 | Nov. 30, 2018
--- | --- | --- | --- | ---
Principal | $ 120,000 | $ 175,000 |  |
Unamortized debt issuance costs | 853 | 1,415 |  |
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] |  |  |  |
Principal | 0 | 55,000 |  | $ 55,000
Unamortized debt issuance costs | 0 | 180 |  |
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member] |  |  |  |
Principal | 120,000 | 120,000 | $ 120,000 |
Unamortized debt issuance costs | $ 853 | $ 1,235 |  |

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