Note 6 - Goodwill and Intangible Assets (Tables)

6 Months Ended

Sep. 27, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	September 27, 2015							March 29, 2015
	Carrying Amount		Accumulated Amortization			Net Carrying Amount		Carrying Amount		Accumulated Amortization			Impairment Charge			Net Carrying Amount
Amortized intangible assets:
Existing technology	$	113,785	$	(52,543	)	$	61,242	$	120,041	$	(47,259	)	$	(9,134	)	$	63,648
Customer relationships		14,295		(5,441	)		8,854		15,165		(4,520	)		(870	)		9,775
Distributor relationships		7,254		(2,402	)		4,852		7,254		(1,973	)		—			5,281
Patents/core technology		3,459		(3,459	)		—		3,459		(3,446	)		—			13
Trade names		1,330		(402	)		928		1,330		(274	)		—			1,056
Total intangible assets subject to amortization		140,123		(64,247	)		75,876		147,249		(57,472	)		(10,004	)		79,773
In-process research and development		3,451		—			3,451		9,148		—			(2,819	)		6,329
Total	$	143,574	$	(64,247	)	$	79,327	$	156,397	$	(57,472	)	$	(12,823	)	$	86,102

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

	Three Months Ended				Six Months Ended
	September 27, 2015		September 28, 2014		September 27, 2015		September 28, 2014
Amortization expense	$	3,405	$	3,724	$	6,775	$	6,001

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Amortization Expense (by fiscal year)
2016 (6 months remaining)	$	6,738
2017		13,423
2018		13,387
2019		13,073
2020		12,283
2021 and thereafter		16,972
Total future amortization	$	75,876