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Note 7 - Net Income (Loss) Per Share - Calculations of Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Basic:    
Net income (loss) $ (16,008) $ 21,663
Basic (in shares) 20,686 20,585
Basic (in dollars per share) $ (0.77) $ 1.05
Diluted:    
Net income (loss) $ (16,008) $ 21,663
Basic (in shares) 20,686 20,585
Unvested restricted stock and DSU's (in shares)
Employee stock options (in shares)
Diluted (in shares) 20,686 20,585
Diluted (in dollars per share) $ (0.77) $ 1.05