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Note 8 - Commitments, Off-balance Sheet Arrangements, and Contingent Liabilities - Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Commitments To Extend Credit Under Amortizing Loans [Member] |  |  |
Off-balance sheet risks liability amount | [1] | $ 44,716 | $ 19,052
Commitments To Extend Credit Under Home Equity Lines Of Credit [Member] |  |  |
Off-balance sheet risks liability amount | [2] | 10,286 | 11,531
Unused Portion of Construction Loans [Member] |  |  |
Off-balance sheet risks liability amount | [3] | 44,309 | 72,753
Unused lines of Credit [Member] |  |  |
Off-balance sheet risks liability amount |  | 15,600 | 15,061
Standby Letters of Credit [Member] |  |  |
Off-balance sheet risks liability amount |  | $ 1,991 | $ 399
[1] | Commitments for loans are extended to customers for up to 90 days after which they expire. Excludes commitments to originate loans held for sale, which are discussed in the following footnote.
[2] | Unused portions of home equity loans are available to the borrower for up to 10 years.
[3] | Unused portions of construction loans are available to the borrower for up to one year.

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