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Note 6 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Text Block Supplement [Abstract]

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

		Years Ended December 31,
		2014				2013				2012
Cost of Design-to-silicon-yield solutions		$	3,419			$	2,736			$	1,786
Research and development			1,709				1,583				1,083
Selling, general and administrative			3,419				2,374				2,022
Stock-based compensation expense		$	8,547			$	6,693			$	4,891

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

		Stock Plans												Employee Stock Purchase Plan
		2014				2013				2012				2014				2013				2012
Expected life (in years)			4.6				4.8				4.8				1.25				1.25				1.25
Volatility			44.0	%			54.1	%			59.2	%			33.4	%			45.3	%			51.6	%
Risk-free interest rate			1.54	%			1.03	%			0.77	%			0.21	%			0.19	%			0.18	%
Expected dividend			—				—				—				—				—				—

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

		Outstanding Options
		Number of Options (in thousands)				Weighted Average Exercise Price per Share				Weighted Average Remaining Contractual Term (years)				Aggregate Intrinsic Value (in thousands)
Outstanding, January 1, 2012			3,872				5.91
Granted (weighted average fair value of $4.38 per share)			1,216				8.80
Exercised			(1,019	)			5.42
Canceled			(216	)			6.34
Expired			(43	)			9.78
Outstanding, December 31, 2012			3,810				6.91
Granted (weighted average fair value of $7.75 per share)			77				17.12
Exercised			(871	)			6.13
Canceled			(114	)			8.76
Expired			(22	)			5.98
Outstanding, December 31, 2013			2,880				7.35
Granted (weighted average fair value of $6.66 per share)			28				17.40
Exercised			(509	)			6.33
Canceled			(40	)			10.03
Expired			(7	)			7.41
Outstanding, December 31, 2014			2,352				7.65				5.72			$	17,218
Vested and expected to vest, December 31, 2014			2,329				7.62				5.70			$	17,103
Exercisable, December 31, 2014			1,858				7.21				5.27			$	14,304

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

		Shares (in thousands)				Weighted- Average Grant-Date Fair Value
Nonvested, January 1, 2012			303				7.82
Granted			359				8.97
Vested			(172	)			9.87
Forfeited			(40	)			7.66
Nonvested, December 31, 2012			450				7.97
Granted			562				18.25
Vested			(217	)			11.01
Forfeited			(36	)			11.08
Nonvested, December 31, 2013			759				14.44
Granted			569				19.42
Vested			(350	)			14.43
Forfeited			(37	)			18.00
Nonvested, December 31, 2014
			941				17.38

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