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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
Mar. 31, 2022
Mar. 31, 2021
Net income $ 5,528 $ 6,238
Weighted average common shares outstanding (in shares) 7,495,464 7,801,058
Basic earnings per share (Note 4) (in dollars per share) $ 0.74 $ 0.80
Net income $ 5,528 $ 6,238
Plus dilutive stock options and restricted stock units (in shares) 21,461 9,732
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,516,925 7,810,790
Diluted earnings per share (Note 4) (in dollars per share) $ 0.74 $ 0.80