Note 2 - Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2014

Note 2 - Stock-Based Compensation (Tables) [Line Items]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended June 30,					Six Months Ended June 30,
	2014		2013			2014		2013
Cost of revenue	$	219	$	146		$	424	$	302
Research and development		2,245		1,693			4,250		3,066
Selling, general and administrative		5,951		3,351			11,339		6,482
Tax benefit		-		(48	)		-		(95	)
Total	$	8,415	$	5,142		$	16,013	$	9,755

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

	Time-Based RSUs			Weighted-Average Grant Date Fair Value Per Share		PSUs			Weighted-Average Grant Date Fair Value Per Share		MSUs		Weighted-Average Grant Date Fair Value Per Share		Total			Weighted-Average Grant Date Fair Value Per Share
Outstanding at January 1, 2014		754,306		$	19.41		1,027,782		$	23.02		1,800,000	$	23.57		3,582,088		$	22.53
Awards granted		236,858			34.54		880,578	(1)		32.36		-		-		1,117,436			32.82
Performance adjustment		-			-		(140,524	)(2)		29.49		-		-		(140,524	)		29.49
Awards released		(281,602	)		19.44		(249,134	)		18.12		-		-		(530,736	)		18.82
Awards forfeited		(7,412	)		17.68		(14,899	)		19.18		-		-		(22,311	)		18.68
Outstanding at June 30, 2014		702,150			24.52		1,503,803			28.73		1,800,000		23.57		4,005,953			25.67

Plan Status [Member]

Note 2 - Stock-Based Compensation (Tables) [Line Items]

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

	Stock Options			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at January 1, 2014		1,356,446		$	15.86		1.9	$	25,505,753
Options exercised		(555,147	)	$	16.29
Options forfeited and expired		(7,641	)	$	10.78
Outstanding at June 30, 2014		793,658		$	15.60		1.6	$	21,230,524
Options exercisable at June 30, 2014 and expected to vest		792,359		$	15.61		1.6	$	21,188,533
Options exercisable at June 30, 2014		749,481		$	15.74		1.4	$	19,943,748

Employee Stock Purchase Program [Member]

Note 2 - Stock-Based Compensation (Tables) [Line Items]

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

	Six Months Ended June 30,
	2014			2013
Expected term (years)		0.5			0.5
Expected volatility		33.9	%		28.5	%
Risk-free interest rate		0.1	%		0.1	%
Dividend yield		-			-