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Note 6 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Net income $ 3,666 $ 3,083 $ 2,893 $ 1,500 $ 2,441 $ 2,291 $ 9,642 $ 6,232
Weighted-average shares outstanding (in shares) 30,570     31,558     30,672 31,538
Effect of dilutive shares (in shares) 92     126     45 71
Weighted-average diluted shares (in shares) 30,662     31,684     30,717 31,609
Net income per share:                
Basic (in dollars per share) $ 0.12     $ 0.05     $ 0.31 $ 0.20
Diluted (in dollars per share) $ 0.12     $ 0.05     $ 0.31 $ 0.20