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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 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Net income $ 4,168 $ 5,227 $ 4,133 $ 2,623 $ 9,394 $ 6,756
Weighted-average shares outstanding (in shares) 30,401   30,684   30,357 30,638
Effect of dilutive shares (in shares) 125   91   115 79
Weighted-average diluted shares (in shares) 30,526   30,775   30,472 30,717
Net income per share:            
Basic (in dollars per share) $ 0.14   $ 0.13   $ 0.31 $ 0.22
Diluted (in dollars per share) $ 0.14   $ 0.13   $ 0.31 $ 0.22