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Note 4 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2014

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,
		2014				2013
Cost of Design-to-silicon-yield solutions		$	724			$	534
Research and development			371				322
Selling, general and administrative			565				453
Stock-based compensation expenses		$	1,660			$	1,309

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

		Stock Plans Three Months Ended March 31,								Employee Stock Purchase Plan Three Months Ended March 31,
		2014				2013				2014				2013
Expected life (in years)			4.58				4.78				1.25				1.25
Volatility			43.4	%			56.4	%			34.6	%			46.1	%
Risk-free interest rate			1.56	%			0.80	%			0.18	%			0.19	%
Expected dividend			—				—				—				—
Weighted average fair value per share of options granted during the period		$	7.75			$	7.54				—				—
Weighted average fair value per share of employee stock purchase plan rights granted during the period			—				—			$	7.18			$	5.28

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, 2014			2,880			$	7.35
Granted (weighted average fair value of $7.75 per share)			5			$	20.39
Exercised			(117	)		$	6.68
Canceled			(11	)		$	8.74
Expired			(7	)		$	5.91
Outstanding, March 31, 2014			2,750			$	7.40				6.35			$	29,694
Vested and expected to vest, March 31, 2014			2,692			$	7.36				6.31			$	29,155
Exercisable, March 31, 2014			1,858			$	6.87				5.61			$	21,003

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, 2014			759			$	14.44
Granted			5			$	20.39
Vested			(3	)		$	6.90
Forfeited			(3	)		$	16.50
Nonvested, March 31, 2014			758			$	14.51

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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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