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Note 7 - Loans and Related Allowance for Credit Losses (Details Textual) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | $ 5,700,000 |  | $ 5,700,000 |  |  | $ 5,500,000 |  |
Financing Receivable, Deferred Commitment Fee | 8,600,000 |  | 8,600,000 |  |  | 9,200,000 |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  | $ (102,000) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Percentage |  |  | 0.50% |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Total | 1,497,704,000 |  | $ 1,497,704,000 |  |  | 1,478,130,000 |  |
Financing Receivable, Nonaccrual, Interest Income | $ 171,000 | $ 88,000 | 300,000 | $ 203,000 |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 |  |  |  |  |  |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 195,000 |  | 195,000 |  |  | 228,000 |  |
Financing Receivable, Allowance for Credit Loss | 21,795,000 | $ 20,591,000 | 21,795,000 | $ 20,591,000 | $ 21,069,000 | 21,693,000 | $ 20,162,000 | $ 14,438,000
Threshold For Loans Evaluated For Impairment [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Total | 750,000 |  | 750,000 |  |  |  |  |
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Total | 150,000 |  | 150,000 |  |  |  |  |
Unfunded Loan Commitment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 1,700,000 |  | $ 1,700,000 |  |  | $ 1,800,000 |  |

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