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Note 2 - (Loss) Income Per Share - Basic and Diluted Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net (loss) income $ (5,179) $ 452 $ (11,437) $ 860
Weighted average shares outstanding (in shares) 78,270,386 76,244,975 77,574,295 76,007,997
Weighted average restricted shares vested not delivered (in shares) 1,691,889 2,265,408 1,986,348 2,549,334
Total basic weighted average shares outstanding (in shares) 79,962,275 78,510,383 79,560,643 78,557,331
Total diluted weighted average shares outstanding (in shares) 79,962,275 78,666,776 79,560,643 78,905,792
Basic (in dollars per share) $ (0.06) $ 0.01 $ (0.14) $ 0.01
Diluted (in dollars per share) $ (0.06) $ 0.01 $ (0.14) $ 0.01
Restricted Stock Units (RSUs) [Member]        
Dilutive effect of assumed conversion of share-based payment arrangement (in shares) 0 156,393 0 348,461