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Note 10 - Common Stock and Stock-based Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Number of options and SAR units (1)				Weighted average exercise price				Weighted average remaining contractual term				Aggregate intrinsic- value
Outstanding as of December 31, 2018			702,817			$	19.88				4.3			$	2,708
Granted			—				—
Exercised			(17,963	)			17.09
Forfeited or expired			(375	)			24.86
Outstanding as of March 31, 2019 (2)			684,479			$	19.95				4.1			$	5,142
Exercisable as of March 31, 2019 (3)			610,513			$	19.22				3.8			$	4,993

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

		Number of RSUs				Weighted Average Grant-Date Fair Value
Unvested as of December 31, 2018			564,390			$	32.28
Granted			340,050				28.57
Vested			(220,908	)			29.23
Forfeited or expired			(6,265	)			29.63
Unvested as of March 31, 2019			677,267			$	31.43

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three months ended March 3 1 ,
		201 9 (unaudited)				201 8 (unaudited)
Cost of revenue		$	136			$	157
Research and development, net			1,362				1,269
Sales and marketing			356				454
General and administrative			562				891
Total equity-based compensation expense		$	2,416			$	2,771

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

		Three months ended March 3 1 ,
		201 9 (unaudited)				201 8 (unaudited)
Expected dividend yield			0	%			0%
Expected volatility			43	%		35%	-	42%
Risk-free interest rate			2.5	%		0.7%	-	1.6%
Contractual term of up to (months)			24				24

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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