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Note 4 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Share-based Compensation, Stock Options, Activity [Table Text Block]

	Three Months Ended March 31, 2017 (unaudited)
	Number			Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)

Options outstanding as of January 1, 2017		2,388,348		$	15.243	$	30,025		5.861
Granted		-		$	-
Exercised		(126,070	)	$	7.417
Forfeited		(5,749	)	$	26.634

Options outstanding as of March 31, 2017		2,256,529		$	15.654	$	37,625		5.689

Options exercisable at the end of the period		1,750,759		$	13.536	$	32,869		5.113

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Range of exercise price			Options outstanding as of March 31, 2017		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of March 31, 2017		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable

$1.039	-	$1.576		640,966		2.183	$	1.323		640,966		2.183	$	1.323
$6.230	-	8.800		82,174		4.732	$	6.991		82,174		4.732	$	6.991
$12.470	-	16.870		413,768		6.897	$	13.906		305,515		6.282	$	12.997
$19.510	-	21.660		529,192		7.392	$	21.205		326,929		7.340	$	21.202
$22.010	-	24.230		288,474		7.050	$	22.287		203,947		7.040	$	22.327
	$29.880			154,200		7.899	$	29.880		80,322		7.899	$	29.880
	$39.860			147,755		6.978	$	39.860		110,906		6.978	$	39.860

				2,256,529		5.689	$	15.654		1,750,759		5.113	$	13.536

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

	Options for shares of common stock		Exercise price per share		Options exercisable		Exercisable through
	(number)				(number)

February 2013		1,500	$	12.470		1,500	February 2023
August 2013		4,188	$	21.140		3,297	August 2023
March 2014		13,100	$	39.860		9,727	March 2024
May 2014		6,387	$	22.010		4,261	May 2024
November 2014		9,821	$	21.660		5,390	November 2024
May 2015		5,000	$	19.510		2,294	May 2025
February 2016		2,500	$	16.870		675	February 2026

		42,496				27,144

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of shares underlying outstanding restricted stock units			Weighted- average grant date fair value
Unvested balance - January 1, 2017		1,399,127		$	19.96
Granted		898,950		$	28.17
Vested		(241,931	)	$	20.23
Forfeited		(15,787	)	$	22.05
Unvested balance – March 31, 2017		2,040,359		$	24.18

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Three Months Ended March 31,
	2017		2016
	(unaudited)
	(in thousands)

Cost of revenues	$	227	$	146
Research and development		1,130		665
Sales and marketing		2,059		1,175
General and administrative		988		638

Total	$	4,404	$	2,624

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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