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Note 4 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Disclosure Text Block Supplement [Abstract]

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

		Three Months Ended March 31,
		2015				2014
Cost of Design-to-silicon-yield solutions		$	887			$	724
Research and development			491				371
Selling, general and administrative			821				565
Stock-based compensation expenses		$	2,199			$	1,660

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

		Three Months Ended March 31,
		2015				2014
Expected life (in years)			4.51				4.58
Volatility			46.48	%			43.35	%
Risk-free interest rate			1.25	%			1.56	%
Expected dividend			—				—
Weighted average fair value per share of options granted during the period		$	6.38			$	7.75

		Three Months Ended March 31,
		2015				2014
Expected life (in years)			1.25				1.25
Volatility			54.21	%			34.56	%
Risk-free interest rate			0.26	%			0.18	%
Expected dividend			—				—
Weighted average fair value of purchase rights granted under the Purchase Plan		$	6.19			$	7.18

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

		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, 2015			2,352			$	7.65
Granted (weighted average fair value of $6.38 per share)			12			$	16.12
Exercised			(462	)		$	6.76
Canceled			(10	)		$	10.41
Expired			(1	)		$	13.08
Outstanding, March 31, 2015			1,891			$	7.90				5.47			$	19,032
Vested and expected to vest, March 31, 2015			1,874			$	7.87				5.45			$	18,918
Exercisable, March 31, 2015			1,511			$	7.40				5.00			$	15,917

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

		Shares (in thousands)				Weighted Average Grant Date Fair Value Per Share
Nonvested, January 1, 2015			941			$	17.38
Granted			12			$	16.12
Vested			(19	)		$	17.86
Forfeited			(18	)		$	17.66
Nonvested, March 31, 2015			916			$	17.35

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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