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Note 3 - Net Income Per Common Share - Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net income	$ 3,712	$ 13,984
Basic - weighted-average shares outstanding: (in shares)	27,464,136	26,776,806
Employee stock options and other (in shares)	234,059	152,834
Diluted - weighted-average shares outstanding: (in shares)	27,698,195	26,929,640
Basic (in dollars per share)	$ 0.14	$ 0.52
Diluted (in dollars per share)	$ 0.13	$ 0.52

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