Note 13. Equity Incentive Plans and Employee Benefits (Tables)

6 Months Ended

Jul. 28, 2012

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

	Number of Shares Outstanding			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Balance, January 28, 2012		5,846,027		$	12.47		6.16	$	885,840
Granted		—			—
Cancelled		(152,654	)		11.33
Exercised		(25,801	)		2.18
Balance, April 28, 2012		5,667,572			12.54		6.03		710,739
Granted		100,000			5.56
Cancelled		(84,414	)		12.34
Exercised		(5,201	)		3.23
Balance, July 28, 2012		5,677,957			12.43		5.72		1,163,897
Ending Vested and Expected to Vest		5,598,252			12.47		5.68		1,127,291
Ending Exercisable		3,946,445			13.12		4.96		861,903

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

	Restricted Stock Awards			Weighted Average Grant Date Fair Value Per Award		Aggregate Value
Balance as of January 28, 2012		231,179		$	8.82
Granted		—
Released		—
Balance as of April 28, 2012		231,179			8.82
Granted		—
Released		(28,070	)		8.63
Balance as of July 28, 2012		203,109			8.84	$	1,795,484

	Restricted Stock Units			Weighted Average Grant Date Fair Value Per Unit		Aggregate Value
Balance as of January 28, 2012		547,500		$	5.92
Granted		23,075			6.03
Cancelled		(7,600	)		6.44
Balance as of April 28, 2012		562,975			5.62
Granted		84,625			5.56
Released		(234	)		5.95
Cancelled		(21,975	)		6.36
Balance as of July 28, 2012		625,391			6.74	$	4,215,135

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

	Three Months Ended				Six Months Ended
	July 28, 2012		July 30, 2011		July 28, 2012		July 30, 2011
Cost of revenue	$	133	$	129	$	250	$	229
Research and development expenses		1,508		1,684		2,971		3,216
Sales and marketing expenses		483		565		955		1,159
General and administrative expenses		627		758		1,400		1,723
Total share-based compensation	$	2,751	$	3,136	$	5,576	$	6,327

Three Months Ended [Member]

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

	Three Months Ended
	July 28, 2012						July 30, 2011
	Stock Option Plan			Employee Stock Purchase Plan			Stock Option Plan			Employee Stock Purchase Plan
Expected volatility		52.07	%		41.54	%		52.02	%		49.49	%
Risk-free interest rate		0.82	%		0.16	%		1.70	%		0.10	%
Expected term (in years)		5.88			0.50			5.94			0.50
Dividend yield	None			None			None			None
Weighted average fair value at grant date	$	2.70		$	1.70		$	5.92		$	2.27

Six Months Ended [Member]

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

	Six Months Ended
	July 28, 2012						July 30, 2011
	Stock Option Plan			Employee Stock Purchase Plan			Stock Option Plan			Employee Stock Purchase Plan
Expected volatility		52.07	%		41.54	%		51.78	%		49.49	%
Risk-free interest rate		0.82	%		0.16	%		1.90	%		0.10	%
Expected term (in years)		5.88			0.50			5.93			0.50
Dividend yield	None			None			None			None
Weighted average fair value at grant date	$	2.70		$	1.70		$	6.25		$	2.27