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Note 13 - Net Income Per Share - Net Loss Per Basic and Diluted Weighted Average Common Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net income $ 7,267 $ 10,747 $ 13,829 $ 15,886
Basic weighted-average common shares outstanding (in shares) 9,802 9,745 9,782 9,739
Effect of potentially dilutive common shares (in shares) 59 40 69 23
Diluted weighted-average common shares outstanding (in shares) 9,861 9,785 9,851 9,762
Basic (in dollars per share) $ 0.74 $ 1.10 $ 1.41 $ 1.63
Diluted (in dollars per share) $ 0.73 $ 1.10 $ 1.40 $ 1.63