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Note 9 - Long-term Debt (Details Textual) - USD ($) $ in Millions |  | 1 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 01, 2023 | Mar. 31, 2021 | Nov. 30, 2018 | Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument, Face Amount |  |  |  | $ 120 | $ 120
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 55 |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  | 6.18% |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 100.00% |  |  |  |
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] | London Interbank Offered Rate [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.15% |  |
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 120 |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  | 4.00% |  |  |
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.29% |  |  |

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