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Note 10 - Net Income (Loss) Per Common Share - Calculation of Diluted Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income (loss) $ (1,118) $ 22,308
Amount attributable to unvested restricted shares 0 (484)
Amount attributable to warrants outstanding 0 (3,460)
Net income (loss) allocated to common shareholders $ (1,118) $ 18,364
Weighted-average common shares issued and outstanding (in shares) 33,236,818 21,010,817
Basic earnings (loss) per common share (in dollars per share) $ (0.03) $ 0.87
Amount attributable to warrants $ 0 $ (569)
Less: gain related to change in fair value of warrants (0) 21,913
Diluted loss allocated to common shareholders $ (1,118) $ (174)
Diluted loss per common share (in dollars per share) $ (0.03) $ (0.01)