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Note 9 - Capital Stock and Stock-based Compensation - Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net (loss) income available to common stockholders $ (980) $ 2,435 $ (358) $ (4,445)
Weighted average shares outstanding - basic (in shares) 42,354 41,304 42,204 41,256
Dilutive effect of equity awards (in shares) 0 1,256 0 0
Weighted average shares outstanding - diluted (in shares) 42,354 42,560 42,204 41,256
Basic (loss) earnings per share (in dollars per share) $ (0.02) $ 0.06 $ (0.01) $ (0.11)
Diluted (loss) earnings per share (in dollars per share) $ (0.02) $ 0.06 $ (0.01) $ (0.11)
Shares excluded from diluted (loss) income per share due to their anti-dilutive effect (in shares) 4,286 910 3,795 3,717