Note 12 - Stock-Based Compensation (Tables)

3 Months Ended

Jun. 29, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

	As of June 29, 2014		Three Months Ended June 29, 2014
	Shares of Common Stock		Shares of Common Stock		Weighted Average Price
Authorized to issue		4,500
Reserved for future issuance		1,365
Issued				7	$	11.26

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

	Outstanding			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)		In-the-money Options Vested and Exercisable (in thousands)
Balance at March 30, 2014		7,213,848		$	8.98		5.02	$	21,301		2,170
Granted		45,700			10.87
Exercised		(105,751	)		6.99
Cancelled		(133	)		15.67
Forfeited		(385,098	)		10.12
Balance at June 29, 2014		6,768,566		$	8.96		4.84	$	16,701		2,277
Vested and expected to vest, June 29, 2014		6,284,514		$	8.84		4.75	$	16,137
Vested and exercisable, June 29, 2014		2,526,817		$	7.68		3.55	$	8,955

Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block]

	Three months Ended
	June 29, 2014		June 30, 2013
Intrinsic value of options exercised	$	430	$	822

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

	Shares			Weighted Average Grant- Date Fair Value		Weighted Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Unvested at March 30, 2014		1,177,126		$	10.94		1.62	$	13,784
Granted		150,813			12.87
Issued and released		(147,648	)		9.80
Cancelled		(59,332	)		11.84
Unvested at June 29, 2014		1,120,959		$	11.30		1.61	$	12,420
Vested and expected to vest, June 29, 2014		965,301					1.54	$	10,696

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

	Three Months Ended
	June 29, 2014		June 30, 2013
Cost of sales	$	260	$	142
Research and development		812		140
Selling, general and administrative		2,055		805
Total Stock-based compensation expense	$	3,127	$	1,087

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

	June 29, 2014
	Amount (in thousands)		Weighted Average Expected Remaining Period (in years)
Options	$	9,349		2.5
Performance Options		606		2.0
RSUs		5,650		2.2
PRSUs		1,882		2.3
Total Unrecognized Stock-based compensation expense	$	17,487

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

	Three Months Ended
	June 29, 2014			June 30, 2013
Expected term of options (years)		4.5			4.4
Risk-free interest rate		1.3	%		0.6	%
Expected volatility		32	%		35	%
Expected dividend yield		─			─
Weighted average estimated fair value	$	3.12		$	3.20