Note 3 - Discontinued Operations - Summarized Results From Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015	Mar. 27, 2016
Net sales	$ 12,786	$ 11,986	$ 26,308	$ 24,225
Cost of sales	7,370	6,017	15,072	11,842
Amortization of purchased intangible assets		1,867	1,245	3,722
Total cost of sales	7,370	7,884	16,317	15,564
Gross profit	5,416	4,102	9,991	8,661
Research and development	2,975	1,654	4,660	3,535
Selling, general and administrative	1,407	2,268	2,804	4,214
Total operating expenses, net	4,382	3,922	7,464	7,749
Interest income and other, net	(76)	(3)	(79)	(7)
Income before income taxes	1,110	183	2,606	919
Provision for income taxes	185	2,290	284	3,182
Net income (loss) from discontinued operations	925	(2,107)	2,322	(2,263)
Accounts receivable, net	11,956	13,427	11,956	13,427
Inventories	7,094	7,944	7,094	7,944
Deferred income taxes and other assets	182	248	182	248
Property, plant and equipment, net	115	88	115	88
Goodwill	13,258	13,258	13,258	13,258
Identifiable intangible assets, net	57,140	58,946	57,140	58,946
Total assets	89,745	93,911	89,745	93,911	$ 93,911
Accounts payable	4,747	2,024	4,747	2,024
Accrued liabilities	2,625	1,422	2,625	1,422
Deferred income taxes and other liabilities	4	24	4	24
Total liabilities	$ 7,376	$ 3,470	$ 7,376	$ 3,470	$ 3,470