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Note 4 - Earnings Per Share - Computation of Basic Earnings Per Share and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income $ 5,813 $ 5,749 $ 16,956 $ 17,029
Weighted average common shares outstanding (in shares) 7,507,538 7,621,423 7,500,877 7,730,135
Basic earnings per share (Note 4) (in dollars per share) $ 0.77 $ 0.75 $ 2.26 $ 2.20
Net income $ 5,813 $ 5,749 $ 16,956 $ 17,029
Plus dilutive stock options and restricted stock units (in shares) 12,820 12,644 17,279 13,766
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,520,358 7,634,067 7,518,156 7,743,901
Diluted earnings per share (Note 4) (in dollars per share) $ 0.77 $ 0.75 $ 2.26 $ 2.20