Note 6 - Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

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

	Three Months Ended March 31,
	2015		2014
Numerator:
Net income	$	5,963	$	9,018
Denominator:
Weighted-average outstanding shares used to compute basic net income per share		39,105		38,470
Effect of dilutive securities		1,491		1,047
Weighted-average outstanding shares used to compute diluted net income per share		40,596		39,517
Net income per share:
Basic	$	0.15	$	0.23
Diluted	$	0.15	$	0.23