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Note 4 - Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

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

	Nine Months Ended September 30, 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		(563,461	)	$	10.689
Forfeited		(88,536	)	$	20.319

Options outstanding as of September 30, 2017		1,736,351		$	16.451	$	44,188		5.169

Options exercisable at the end of the period		1,467,826		$	15.116	$	39,315		4.808

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 September 30, 2017		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of September 30, 2017		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable

$1.039	-	$1.576		474,009		1.585	$	1.300		474,009		1.585	$	1.300
$6.230	-	8.800		66,929		4.211	$	7.072		66,929		4.211	$	7.072
$12.470	-	16.870		247,589		6.027	$	13.359		217,379		5.699	$	12.871
$19.510	-	21.660		434,529		6.891	$	21.215		309,082		6.839	$	21.211
$22.010	-	24.230		233,602		6.555	$	22.261		190.129		6.546	$	22.296
	$29.880			140,209		7.397	$	29.880		87.906		7.397	$	29.880
	$39.860			139,484		6.361	$	39.860		122.392		6.344	$	39.860
				1,736,351		5.169	$	16.451		1,467,826		4.808	$	15.116

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		3,821	August 2023
March 2014		13,100	$	39.860		11,365	March 2024
May 2014		6,187	$	22.010		4,974	May 2024
November 2014		8,272	$	21.660		5,170	November 2024
May 2015		2,833	$	19.510		1,168	May 2025
February 2016		2,500	$	16.870		987	February 2026
		38,580				28,985

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		1,176,153		$	30.10
Vested		(352,136	)	$	21.24
Forfeited		(222,938	)	$	22.33
Unvested balance – September 30, 2017		2,000,206		$	26.10

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	(unaudited)				(unaudited)
	(in thousands)				(in thousands)

Cost of revenues	$	283	$	186	$	783	$	504
Research and development		1,374		805		3,805		2,263
Sales and marketing		1,856		1,613		6,277		4,416
General and administrative		1,269		854		3,580		2,272

Total	$	4,782	$	3,458	$	14,445	$	9,455

- 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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