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Note 11 - Net Income Per Share - Loss Per Basic and Diluted Weighted Average Common Share Outstanding for Continuing and Discontinued Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net income $ 3,559 $ 2,175
Basic (in shares) 9,881 9,814
Effect of potentially dilutive common shares (in shares) [1] 92 107
Diluted weighted-average common shares outstanding (in shares) 9,973 9,921
Basic (in dollars per share) $ 0.36 $ 0.22
Diluted (in dollars per share) $ 0.36 $ 0.22
[1] There were no antidilutive shares for the years ended December 31, 2021, 2020 or 2019.