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Note 9 - Federal Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Tax at statutory rate, amount $ 20,640 $ 21,567 $ 15,915
Tax at statutory rate, percent 21.00% 21.00% 21.00%
Tax-exempt interest, amount $ (1,027) $ (862) $ (695)
Tax-exempt interest, percent (1.00%) (0.80%) (0.90%)
Bank owned life insurance, amount $ (529) $ (303) $ (334)
Bank owned life insurance, percent (0.50%) (0.30%) (0.40%)
Non-deductible expenses, amount $ 241 $ 213 $ 129
Non-deductible expenses, percent 0.20% 0.20% 0.20%
Tax credits, amount $ (266) $ 24 $ (262)
Tax credits, percentage (0.30%) 0.00% (0.30%)
Other, amount $ (366) $ (157) $ (26)
Other, percent (0.40%) (0.20%) 0.00%
Tax expense $ 18,693 $ 20,482 $ 14,727
Tax expense, percent 19.00% 19.90% 19.60%