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Note 4 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure Text Block Supplement [Abstract]

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2013				2012				2013				2012
Cost of design-to-silicon yield-solutions		$	649			$	432			$	1,183			$	751
Research and development			337				251				659				438
Selling, general and administrative			723				636				1,176				1,035
Stock-based compensation expenses		$	1,709			$	1,319			$	3,018			$	2,224

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2013				2012				2013				2012
Expected life (in years)			4.78				4.87				4.78				4.84
Volatility			55.0	%			59.5	%			56.1	%			59.6	%
Risk-free interest rate			1.33	%			0.78	%			0.93	%			0.78	%
Expected dividend			—				—				—				—
Weighted average fair value per share of options granted during the period		$	8.50			$	4.32			$	7.77			$	4.21

										Six Months Ended June 30,
										2013				2012
Expected life (in years)											1.25				1.25
Volatility											46.1	%			51.1	%
Risk-free interest rate											0.19	%			0.16	%
Expected dividend											—				—
Weighted average fair value of purchase rights granted under the purchase plan										$	5.28			$	2.33

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, 2013			3,810			$	6.91
Granted			63			$	15.83
Exercised			(427	)		$	6.51
Canceled			(72	)		$	6.93
Expired			(16	)		$	5.44
Outstanding, June 30, 2013			3,358			$	7.12				7.05			$	37,964
Vested and expected to vest, June 30, 2013			3,181			$	7.05				6.96			$	36,191
Exercisable, June 30, 2013			1,890			$	6.57				6.01			$	22,416

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, 2013			450			$	7.97
Granted			547			$	18.48
Vested			(87	)		$	9.01
Forfeited			(20	)		$	8.01
Nonvested, June 30, 2013			890			$	14.22

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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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