Note 2 - Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2014		2013
Cost of revenue	$	205	$	156
Research and development		2,005		1,373
Selling, general and administrative		5,388		3,131
Tax benefit		-		(47	)
Total	$	7,598	$	4,613

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 (1)		120,135		$	32.06		756,684		$	31.58		-	$	-		876,819		$	31.65
Performance adjustment (2)		-		$	-		(155,255	)	$	29.65		-	$	-		(155,255	)	$	29.65
Awards released		(145,524	)	$	18.97		(165,136	)	$	17.76		-	$	-		(310,660	)	$	18.33
Awards forfeited		(3,892	)	$	18.39		-		$	-		-	$	-		(3,892	)	$	18.39
Outstanding at March 31, 2014		725,025		$	21.60		1,464,075		$	27.33		1,800,000	$	23.57		3,989,100		$	24.59

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]

	Three Months Ended March 31,
	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		-			-

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		(350,920	)	$	15.83		-	$	-
Options forfeited and expired		(1,167	)	$	11.48		-	$	-
Outstanding at March 31, 2014		1,004,359		$	15.87		1.7	$	22,998,787
Options exercisable at March 31, 2014 and expected to vest		1,002,281		$	15.88		1.7	$	22,942,298
Options exercisable at March 31, 2014		942,757		$	16.01		1.5	$	21,459,665