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Note 10 - 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
Mar. 31, 2021
Mar. 31, 2020
Net income $ 2,175 $ 564
Basic weighted-average common shares outstanding (in shares) 9,814 9,751
Effect of potentially dilutive common shares (1) (in shares) [1] 107 78
Diluted weighted-average common shares outstanding (in shares) 9,921 9,829
Basic (in dollars per share) $ 0.22 $ 0.06
Diluted (in dollars per share) $ 0.22 $ 0.06
[1] The weighted-average number of antidilutive shares not included in the computation of diluted net income per share was approximately 7,000 for the three months ended March 31, 2021.