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Note 3 - Earnings Per Share - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ 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 (loss) income $ (2,703) $ (2,404) $ 10,252 $ (1,210) $ (5,107) $ 9,042
Weighted average number of common shares outstanding (in shares) 20,244,176   18,760,910   19,977,477 17,973,896
Basic net (loss) income per share (in dollars per share) $ (0.13)   $ 0.55   $ (0.26) $ 0.50
Non-vested stock awards (1) (in shares) [1] 0   639,150   0 889,874
Weighted average number of common shares outstanding (in shares) 20,244,176   19,400,060   19,977,477 18,863,770
Diluted net (loss) income per share (in dollars per share) $ (0.13)   $ 0.53   $ (0.26) $ 0.48
[1] Restricted stock units granted and outstanding of 829,890 as of June 30, 2022, are excluded from the computation of diluted earnings due to the anti-dilutive effect as a result of the Company’s net loss for the three and six months ended June 30, 2022.