Note 4 - Loans and Allowance for Credit Losses - Components of Allowance for Credit Losses (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Beginning balance | $ 4,641 | $ 4,594 | $ 4,634 | $ 4,560 | $ 4,560 |
| Provision for (recovery of) credit losses | 0 | 238 | 0 | 268 | |
| Charge-offs | 0 | (356) | 0 | (356) | (647) |
| Charge-offs | 0 | (356) | 0 | (356) | (647) |
| Recoveries | 53 | 11 | 60 | 15 | 23 |
| Ending balance | 4,694 | 4,487 | 4,694 | 4,487 | 4,634 |
| Held-to-Maturity Securities [Member] | |||||
| Beginning balance | 88 | 63 | 79 | 60 | 60 |
| Provision for (recovery of) credit losses | (25) | 18 | (16) | 21 | |
| Charge-offs | 0 | 0 | 0 | 0 | |
| Charge-offs | 0 | 0 | 0 | 0 | |
| Recoveries | 0 | 0 | 0 | 0 | |
| Ending balance | 63 | 81 | 63 | 81 | 79 |
| Loans [Member] | |||||
| Beginning balance | 4,458 | 4,304 | 4,361 | 4,260 | 4,260 |
| Provision for (recovery of) credit losses | 7 | 274 | 97 | 314 | |
| Charge-offs | 0 | (356) | 0 | (356) | |
| Charge-offs | 0 | (356) | 0 | (356) | |
| Recoveries | 53 | 11 | 60 | 15 | |
| Ending balance | 4,518 | 4,233 | 4,518 | 4,233 | 4,361 |
| Unfunded Loan Commitment [Member] | |||||
| Beginning balance | 227 | 240 | 240 | ||
| Provision for (recovery of) credit losses | (54) | (67) | |||
| Charge-offs | 0 | 0 | |||
| Charge-offs | 0 | 0 | |||
| Recoveries | 0 | 0 | |||
| Ending balance | $ 173 | $ 173 | |||
| Unfunded Loan Commitments [Member] | |||||
| Beginning balance | 95 | 194 | |||
| Provision for (recovery of) credit losses | 18 | (81) | |||
| Charge-offs | 0 | 0 | |||
| Charge-offs | 0 | 0 | |||
| Recoveries | 0 | 0 | |||
| Ending balance | $ 113 | $ 113 | $ 194 | ||