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Note 4 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2017

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

	Six Months Ended June 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		(330,351	)	$	10.324
Forfeited		(72,893	)	$	18.148

Options outstanding as of June 30, 2017		1,985,104		$	15.941	$	42,589		5.035

Options exercisable at the end of the period		1,633,271		$	14.216	$	37,856		4.624

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

$1.039	-	$1.576	575,859	1.855	$	1.329	575,859	1.855	$	1.329
$6.230	-	8.800	70,930	4.266	$	7.032	70,930	4.266	$	7.032
$12.470	-	16.870	297,114	6.172	$	13.429	263,780	5.859	$	12.995
$19.510	-	21.660	475,348	6.602	$	21.202	311,878	6.512	$	21.200
$22.010	-	24.230	269,316	6.335	$	22.270	204,808	6.316	$	22.305
	$29.880		150,887	7.649	$	29.880	86,643	7.649	$	29.880
	$39.860		145,650	5.435	$	39.860	119,373	5.435	$	39.860

			1,985,104	5.035	$	15.941	1,633,271	4.624	$	14.216

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		3,559		August 2023
March 2014		13,100	$	39.860		10,546		March 2024
May 2014		6,250	$	22.010		4,580		May 2024
November 2014		8,431	$	21.660		4,663		November 2024
May 2015		3,500	$	19.510		1,105		May 2025
February 2016		2,500	$	16.870		832		February 2026

		39,469				26,785

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		1,011,903		$	28.93
Vested		(309,675	)	$	20.46
Forfeited		(153,200	)	$	21.40
Unvested balance – June 30, 2017		1,948,155		$	25.11

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2017		2016		2017		2016
	(unaudited)				(unaudited)
	(in thousands)				(in thousands)

Cost of revenues	$	273	$	172	$	500	$	318
Research and development		1,301		793		2,431		1,458
Sales and marketing		2,362		1,628		4,421		2,803
General and administrative		1,323		780		2,311		1,418

Total	$	5,259	$	3,373	$	9,663	$	5,997

- 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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