Note 4 - Investment Securities - Summary of Continuous Unrealized Loss Position for Securities Classified as HTM (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Less than 12 months, fair value | $ 0 | $ 0 |
| Less than 12 months, unrealized losses | 0 | 0 |
| 12 months or more, fair value | 3,410 | 3,754 |
| 12 months or more, unrealized losses | (197) | (177) |
| Total, fair value | 3,410 | 3,754 |
| Total, unrealized losses | (197) | (177) |
| US States and Political Subdivisions Debt Securities [Member] | ||
| Less than 12 months, fair value | 0 | 0 |
| Less than 12 months, unrealized losses | 0 | 0 |
| 12 months or more, fair value | 1,776 | 2,060 |
| 12 months or more, unrealized losses | (6) | (3) |
| Total, fair value | 1,776 | 2,060 |
| Total, unrealized losses | (6) | (3) |
| Residential Mortgage-Backed Securities [Member] | ||
| Less than 12 months, fair value | 0 | 0 |
| Less than 12 months, unrealized losses | 0 | 0 |
| 12 months or more, fair value | 1,634 | 1,694 |
| 12 months or more, unrealized losses | (191) | (174) |
| Total, fair value | 1,634 | 1,694 |
| Total, unrealized losses | $ (191) | $ (174) |