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Note 3 - Earnings Per Share - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Net (loss) income $ (1,772) $ (2,703) $ (2,404) $ (2,105) $ 10,252 $ (1,210) $ (6,879) $ 6,937
Weighted average number of common shares outstanding (in shares) 20,505,884     19,417,675     20,155,548 18,460,444
Basic net (loss) income per share (in dollars per share) $ (0.09)     $ (0.11)     $ (0.34) $ 0.38
Non-vested stock awards (1) (in shares) [1] 0     0     0 757,976
Weighted average number of common shares outstanding (in shares) 20,505,884     19,417,675     20,155,548 19,218,420
Diluted net (loss) income per share (in dollars per share) $ (0.09)     $ (0.11)     $ (0.34) $ 0.36
[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.