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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income $ 5,749 $ 3,829 $ 17,029 $ 11,513
Weighted average common shares outstanding (in shares) 7,621,423 7,783,005 7,730,135 7,429,765
Basic earnings per share (Note 4) (in dollars per share) $ 0.75 $ 0.49 $ 2.20 $ 1.55
Net income $ 5,749 $ 3,829 $ 17,029 $ 11,513
Plus dilutive stock options and restricted stock units (in shares) 12,644 7,460 13,766 7,888
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,634,067 7,790,465 7,743,901 7,437,653
Diluted earnings per share (Note 4) (in dollars per share) $ 0.75 $ 0.49 $ 2.20 $ 1.55