Note 6 - Stockholder's Equity (Tables)

12 Months Ended

Dec. 31, 2013

Note 6 - Stockholder's Equity (Tables) [Line Items]

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

	Year Ended December 31,
	2013		2012			2011
Cost of revenue	$	631	$	510		$	312
Research and development		6,219		6,922			5,909
Selling, general and administrative		13,851		11,220			6,905
Tax benefit		-		(187	)		(114	)
Total	$	20,701	$	18,465		$	13,012

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, 2011		616,549		$	19.41		343,625		$	20.73		-	$	-		960,174		$	19.88
Awards granted		853,480			14.40		-			-		-		-		853,480			14.40
Awards released		(310,976	)		17.78		(102,125	)		20.73		-		-		(413,101	)		18.51
Awards forfeited		(76,622	)		18.39		(24,375	)		20.73		-		-		(100,997	)		18.95
Outstanding at December 31, 2011		1,082,431			16.00		217,125			20.73		-		-		1,299,556			16.87
Awards modification (1)		(76,500	)		15.69		76,500			15.69		-		-		-			-
Awards granted (2)(3)		617,084			18.69		962,796			18.24		-		-		1,579,880			18.42
Performance adjustment (4)		-			-		(624,403	)		18.19		-		-		(624,403	)		18.19
Awards released		(447,096	)		17.30		(96,500	)		20.73		-		-		(543,596	)		17.91
Awards forfeited		(77,356	)		16.61		(4,333	)		19.07		-		-		(81,689	)		16,74
Outstanding at December 31, 2012		1,098,563			16.96		531,185			18.49		-		-		1,629,748			17.46
Awards granted (3)		298,908			24.25		874,806			24.43		1,800,000		23.57		2,973,714			23.89
Performance adjustment (4)		-			-		(124,141	)		21.98		-		-		(124,141	)		21.98
Awards released		(518,552	)		17.57		(206,409	)		18.90		-		-		(724,961	)		17.95
Awards forfeited		(124,613	)		17.06		(47,659	)		19.06		-		-		(172,272	)		17.61
Outstanding at December 31, 2013		754,306			19.41		1,027,782			23.02		1,800,000		23.57		3,582,088			22.53

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

			Options Outstanding						Options Exercisable
Range of Exercises Prices			Shares		Weighted-Average Remaining Contractual Life (Years)		Weighted-Average Exercise Price		Shares		Weighted-Average Exercise Price
$0.76	-	$12.42		159,981		2.14	$	10.46		140,945	$	10.36
$12.57	-	$14.89		193,422		2.20		14.36		159,617		14.50
$14.93	-	$14.96		11,494		1.32		14.93		10,882		14.93
$15.03	-	$15.03		485,881		1.82		15.03		485,881		15.03
$15.13	-	$17.92		223,686		1.23		16.97		205,322		17.07
$18.17	-	$19.53		137,282		2.69		19.29		130,726		19.31
$19.56	-	$23.02		131,109		1.83		21.55		127,793		21.56
$23.09	-	$23.09		12,564		2.93		23.09		12,564		23.09
$23.50	-	$23.50		22		2.72		23.50		22		23.50
$24.67	-	$24.67		1,005		1.46		24.67		1,005		24.67
				1,356,446						1,274,757

Employee Stock Option [Member]

Note 6 - Stockholder's Equity (Tables) [Line Items]

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

	Year Ended December 31,
	2012			2011
Expected term (years)		4.1			4.1
Expected volatility		53.4	%		52.9	%
Risk-free interest rate		0.6	%		1.1	%
Dividend yield		-			-

Employee Stock Purchase Program [Member]

Note 6 - Stockholder's Equity (Tables) [Line Items]

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

	Year Ended December 31,
	2013			2012			2011
Expected term (years)		0.5			0.5			0.5
Expected volatility		28.0	%		45.8	%		39.2	%
Risk-free interest rate		0.1	%		0.1	%		0.1	%
Dividend yield		-			-			-

Plan Status [Member]

Note 6 - Stockholder's Equity (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, 2011		5,835,118		$	14.61		4.30	$	19,035,591
Options granted (weighted-average fair value of $5.85 per share)		152,500			13.96
Options exercised		(685,417	)		6.85
Options forfeited and expired		(438,962	)		18.66
Outstanding at December 31, 2011		4,863,239			15.31		3.44		8,817,049
Options granted (weighted-average fair value of $8.22 per share) (1)		178,484			15.63
Options exercised		(1,151,884	)		11.62
Options forfeited and expired		(76,478	)		20.90
Outstanding at December 31, 2012		3,813,361			15.62		2.56		25,379,573
Options exercised		(2,445,523	)		15.49
Options forfeited and expired		(11,392	)		15.27
Outstanding at December 31, 2013		1,356,446			15.86		1.91		25,505,753
Options exercisable at December 31, 2013 and expected to vest		1,353,337			15.86		1.91		25,437,135
Options exercisable at December 31, 2013		1,274,757			15.96		1.76		23,843,458