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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net income $ 5,615 $ 5,043 $ 11,143 $ 11,281
Weighted average common shares outstanding (in shares) 7,499,497 7,769,485 7,497,492 7,785,098
Basic earnings per share (Note 4) (in dollars per share) $ 0.75 $ 0.65 $ 1.49 $ 1.45
Net income $ 5,615 $ 5,043 $ 11,143 $ 11,281
Plus dilutive stock options and restricted stock units (in shares) 11,027 9,600 13,766 10,577
Weighted average common shares outstanding and potentially dilutive shares (in shares) 7,510,524 7,779,085 7,511,258 7,795,675
Diluted earnings per share (Note 4) (in dollars per share) $ 0.75 $ 0.65 $ 1.49 $ 1.45