Note 7 - Commitment and Contingencies - Schedule of Off-balance Sheet Credit Risk (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2026 |
Dec. 31, 2025 |
|
| Off-balance sheet credit risk | $ 172,446 | $ 171,544 |
| Loan Origination Commitments [Member] | ||
| Off-balance sheet credit risk | 23,788 | 30,588 |
| Unused lines of Credit [Member] | ||
| Off-balance sheet credit risk | 99,507 | 93,241 |
| Unadvanced Funds on Construction Loans [Member] | ||
| Off-balance sheet credit risk | 49,101 | 47,665 |
| Letter of Credit [Member] | ||
| Off-balance sheet credit risk | $ 50 | $ 50 |