Note 3 - Investment Securities - Schedule of Held-to-maturity Investment Securities (Details) - USD ($) $ in Thousands |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 16,078 | $ 17,275 |
| Gross unrealized gains, held-to-maturity | 1 | 19 |
| Gross unrealized losses, held-to-maturity | (214) | (131) |
| Fair value, held-to-maturity | 15,865 | 17,163 |
| Nontaxable Municipal Bonds [Member] | ||
| Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 13,578 | 14,775 |
| Gross unrealized gains, held-to-maturity | 1 | 19 |
| Gross unrealized losses, held-to-maturity | (200) | (121) |
| Fair value, held-to-maturity | 13,379 | 14,673 |
| Subordinated Debt [Member] | ||
| Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 2,500 | 2,500 |
| Gross unrealized gains, held-to-maturity | 0 | 0 |
| Gross unrealized losses, held-to-maturity | (14) | (10) |
| Fair value, held-to-maturity | $ 2,486 | $ 2,490 |