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Note 5 - Loans (Details Textual) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | $ 170,235,000 | $ 160,755,000 | $ 170,235,000 | $ 160,755,000 | $ 169,959,000 | $ 164,458,000 | $ 158,092,000 | $ 153,317,000
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) | 9,338,000 | 5,435,000 | $ 27,216,000 | 15,156,000 |  |  |  |
Financing Receivable, Modified, Subsequent Default, Number of Contracts |  |  | 1 |  |  |  |  |
Unfunded Loan Commitment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest | 780,000 |  | $ 780,000 |  |  | $ 608,000 |  |
Financing Receivable, Credit Loss, Expense (Reversal) | $ 125,000 |  | $ 173,000 |  |  |  |  |
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) |  | $ 233,000 |  | $ 32,000 |  |  |  |

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