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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Net Income (Loss) Attributable to Parent, Total $ 1,149 $ 514 $ 1,821 $ 1,431
Shares used in basic net income per share calculation (in shares) 21,808 21,262 21,696 21,225
Stock options and unvested restricted shares (in shares) 127 355 135 375
Shares used in diluted net income per share calculations (in shares) 21,935 21,617 21,831 21,600
Basic and diluted income per common share: (in dollars per share) $ 0.05 $ 0.02 $ 0.08 $ 0.07