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Note 4 - Loans Receivable and Credit Disclosures - Changes in the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Balance, beginning $ 15,697 $ 16,621
Credit loss expense (benefit) 1 [1] 774 (874)
Recoveries of loans charged-off 32 42
Loans charged-off (245) (92)
Balance, ending 16,776 15,697
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]    
Balance, beginning $ 518 0
Balance, ending   $ 518
[1] The difference in the credit loss expense reported herein as compared to the Consolidated Statements of Income is associated with the credit loss expense of $15 thousand related to off-balance sheet credit exposures.