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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						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 14,697	$ 12,607	$ 13,984	$ 16,792	$ 16,166	$ 15,511	$ 41,288	$ 48,469
Basic - weighted-average shares outstanding: (in shares)	26,736,709			26,846,030			26,724,715	26,894,420
Employee stock options and other (in shares)	149,724			159,311			136,932	178,453
Diluted - weighted-average shares outstanding: (in shares)	26,886,433			27,005,341			26,861,647	27,072,873
Basic (in dollars per share)	$ 0.55			$ 0.63			$ 1.54	$ 1.80
Diluted (in dollars per share)	$ 0.55			$ 0.62			$ 1.54	$ 1.79

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