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Note 6 - Net Income (Loss) Per-share - Reconciliation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Net income (loss) $ 771 $ (308) $ (456) $ (699) $ 463 $ (1,155)
Weighted-average shares of common stock outstanding (in shares) 19,088   18,232   18,978 18,167
Basic net income (loss) per share (in dollars per share) $ 0.04   $ (0.03)   $ 0.02 $ (0.06)
Net Income (loss) $ 771 $ (308) $ (456) $ (699) $ 463 $ (1,155)
Dilutive options and warrants outstanding (in shares) 1,851   0   1,811 0
Number of shares used in diluted per share computation (in shares) 20,939   18,232   20,789 18,167
Diluted income (loss) per common share (in dollars per share) $ 0.04   $ (0.03)   $ 0.02 $ (0.06)