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Note 4 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net Income (Loss) Attributable to Parent, Total $ (32) $ 1,180 $ 1,789 $ 2,611
Shares used in basic Net income (loss) per share calculation (in shares) 22,227 21,295 21,873 21,248
Stock options and unvested restricted shares (in shares) 0 294 137 344
Shares used in diluted net income per share calculations (in shares) 22,227 21,589 22,010 21,592
Basic and diluted income (loss) per common share: (in dollars per share) $ (0.00) $ 0.06 $ 0.08 $ 0.12