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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
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.