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Note 2 - Loans and Allowance for Credit Losses - Allowance for Credit Losses on Unfunded Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Balance | $ 9,094 | $ 8,225 | $ 8,225
Recovery of credit losses | 5 | 2 | (1,278)
Balance | 9,055 | 10,650 | 9,094
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Balance |  | 2,342 | 2,342
Unfunded Loan Commitment [Member] |  |  |
Balance | 259 | 35 | 35
Recovery of credit losses | (15) | 0 |
Balance | $ 244 | 242 | 259
Unfunded Loan Commitment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |
Balance |  | $ 207 | $ 207

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