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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 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Basic:                
Net income (loss) $ (4,343) $ (9,911) $ (16,008) $ (2,497) $ 36,093 $ 21,663 $ (30,262) $ 55,259
Basic (in shares) 20,786     20,657     20,731 20,623
Basic (in dollars per share) $ (0.21)     $ (0.12)     $ (1.46) $ 2.68
Diluted:                
Net income (loss) $ (4,343) $ (9,911) $ (16,008) $ (2,497) $ 36,093 $ 21,663 $ (30,262) $ 55,259
Basic (in shares) 20,786     20,657     20,731 20,623
Unvested restricted stock and DSU's (in shares) 0     0     0 0
Employee stock options (in shares) 0     0     0 0
Diluted (in shares) 20,786     20,657     20,731 20,623
Diluted (in dollars per share) $ (0.21)     $ (0.12)     $ (1.46) $ 2.68