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Note 6 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025
Modified |  | $ 126 | $ 83,190
Financial Asset, Not Past Due [Member] |  |  |
Modified | $ 83,190 |  |
Financial Asset, 30 to 89 Days Past Due [Member] |  |  |
Modified | 0 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Modified | 0 |  |
Commercial Portfolio Segment [Member] |  |  |
Modified |  | 126 | 17,974
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Modified | 17,974 | 126 |
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member] |  |  |
Modified | 0 | 0 |
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Modified | 0 | 0 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Modified |  | 0 | 63,804
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Modified | 63,804 |  |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member] |  |  |
Modified | 0 |  |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Modified | 0 |  |
Residential Portfolio Segment [Member] |  |  |
Modified |  | $ 0 | $ 1,412
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |
Modified | 1,412 |  |
Residential Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member] |  |  |
Modified | 0 |  |
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Modified | $ 0 |  |

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