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Note 11 - 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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income $ 4,946 $ 7,267 $ 9,252 $ 13,829
Basic weighted-average common shares outstanding (in shares) 9,871 9,802 9,849 9,782
Effect of potentially dilutive common shares (1) (in shares) [1] 50 59 69 69
Diluted weighted-average common shares outstanding (in shares) 9,921 9,861 9,918 9,851
Basic (in dollars per share) $ 0.50 $ 0.74 $ 0.94 $ 1.41
Diluted (in dollars per share) $ 0.50 $ 0.73 $ 0.93 $ 1.40
[1] The weighted-average number of antidilutive shares not included in the computation of diluted net income per share was approximately 90,000 for the three months ended June 30, 2020. There were no antidilutive shares for the three and six months ended June 30, 2021 and the six months ended June 30, 2020.