Note 11 - Stock-based Compensation (Tables)

3 Months Ended

Jul. 03, 2016

Performance-based Restricted Stock Units [Member]

Notes Tables

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

Expected term of grants (years)	3
Risk-free interest rate	0.76	%
Expected volatility	50	%

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

	As of		Three Months Ended
	July 3, 2016		July 3, 2016
					Weighted
	Shares of		Shares of		Average
	Common Stock		Common Stock		Price per Share
Authorized to issue		4,500
Reserved for future issuance		1,306
Issued				11	$	6.20

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

						Weighted
						Average				In-the-money
				Weighted		Remaining		Aggregate		Options
	Outstanding			Average		Contractual		Intrinsic		Vested and
	Options /			Exercise		Term		Value		Exercisable
	Quantity			Price per Share		(in years)		(in thousands)		(in thousands)
Balance at March 27, 2016		7,722,383		$	7.96		4.40	$	87		48
Granted		1,161,900			6.78
Exercised		(405,385	)		6.42
Cancelled		(235,726	)		7.95
Forfeited		(462,810	)		7.66
Balance at July 3, 2016		7,780,362			7.88		4.26		6,760		4,353
Vested and expected to vest, July 3, 2016		7,005,891			7.98		4.05		5,783
Vested and exercisable, July 3, 2016		3,654,884		$	8.67		2.45	$	1,745

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

	Three Months Ended
	July 3,		June 28,
	2016		2015
Intrinsic value of options exercised	$	521	$	426

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

						Weighted
						Average
				Weighted		Remaining		Aggregate
				Average		Contractual		Intrinsic
				Grant-Date		Term		Value
	Shares			Fair Value		(in years)		(in thousands)
Unvested at March 27, 2016		590,833		$	9.39		1.45	$	3,108
Granted		169,800			7.20
Issued and released		(51,566	)		9.99
Forfeited		(123,196	)		9.39
Unvested at July 3, 2016		585,871		$	8.71		1.34	$	4,570
Vested and expected to vest, July 3, 2016		486,294					1.23		3,793

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

	Three Months Ended
	July 3, 2016			June 28, 2015
Expected term of options (years)		4.5			4.7
Risk-free interest rate		1.03	%		1.2	%
Expected volatility		34.9	%		32	%
Expected dividend yield		-			-
Weighted average estimated fair value	$	2.08		$	3.08

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

	Three Months Ended
	July 3,		June 28,
	2016		2015
Cost of sales	$	114	$	80
Research and development		246		294
Selling, general and administrative		733		1,349
Total stock-based compensation expense	$	1,093	$	1,723

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

	July 3, 2016
			Weighted
			Average
			Remaining
	Amount		Recognition
	(in thousands)		Period (in years)
Options	$	6,402		2.69
RSUs		1,635		1.50
PRSUs		495		2.22
Total unrecognized stock-based compensation expense	$	8,532