Note 11 - Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended December 31,
	2017		2016		2015
Numerator:
Net income	$	65,203	$	52,720	$	35,172
Denominator:
Weighted-average outstanding shares used to compute basic net income per share		41,350		40,436		39,470
Effect of dilutive securities		2,228		1,479		1,399
Weighted-average outstanding shares used to compute diluted net income per share		43,578		41,915		40,869
Net income per share:
Basic	$	1.58	$	1.30	$	0.89
Diluted	$	1.50	$	1.26	$	0.86