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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				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income	$ 12,607	$ 13,984	$ 16,166	$ 15,511	$ 26,591	$ 31,677
Basic - weighted-average shares outstanding: (in shares)	26,660,498		26,875,153		26,718,652	26,919,016
Employee stock options and other (in shares)	100,368		166,269		119,286	194,312
Diluted - weighted-average shares outstanding: (in shares)	26,760,866		27,041,422		26,837,938	27,113,328
Basic (in dollars per share)	$ 0.47		$ 0.60		$ 1.00	$ 1.18
Diluted (in dollars per share)	$ 0.47		$ 0.60		$ 0.99	$ 1.17

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