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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Net income $ 1,644,000 $ 576,000 $ 1,146,000 $ 552,000 $ 2,220,000 $ 1,698,000
Basic weighted average common shares outstanding (in shares) 11,137,066   11,997,443   11,281,739 12,072,571
Add: dilutive effect of common stock options (in shares) 85,090   16,402   93,962 30,848
Diluted weighted average common shares outstanding (in shares) 11,226,341   12,013,845   11,375,701 12,103,419
Basic earnings per common share (in dollars per share) $ 0.15   $ 0.1   $ 0.2 $ 0.14
Diluted earnings per common share (in dollars per share) $ 0.15   $ 0.1   $ 0.2 $ 0.14