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Note 8 - Basic and Diluted Earnings Per Common Share - Reconciliation of Net Income and Number of Shares Used in Computations of Basic and Diluted EPS (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Net income $ 1,244,000 $ 613,000 $ 1,644,000 $ 576,000 $ 1,857,000 $ 2,220,000
Basic weighted average common shares outstanding (in shares) 10,501,865   11,137,066   10,407,287 11,281,739
Add: dilutive effect of common stock options (in shares) 109,187   89,275   110,365 93,962
Diluted weighted average common shares outstanding (in shares) 10,611,052   11,226,341   10,517,652 11,375,701
Basic earnings per common share (in dollars per share) $ 0.12   $ 0.15   $ 0.18 $ 0.2
Diluted earnings per common share (in dollars per share) $ 0.12   $ 0.15   $ 0.18 $ 0.2