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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

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 + Details
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