CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Net sales	$ 42,856	$ 59,647	$ 77,886	$ 105,819
Cost of sales	27,075	35,015	48,870	61,801
Gross profit	15,781	24,632	29,016	44,018
Operating expenses:
Selling, service and administration	12,915	14,251	26,015	28,798
Research, development and engineering	8,424	9,719	17,569	18,144
Business Combination, Bargain Purchase, Gain Recognized, Amount	0	(35)	0	(499)
Net operating expenses	21,339	23,935	43,584	46,443
Operating (loss) income	(5,558)	697	(14,568)	(2,425)
Other-than-temporary impairment of cost based investments	0	(3,588)	0	(3,588)
Non-operating (expense) income:
Interest and other (expense) income, net	(244)	80	(198)	20
Other Nonoperating Income (Expense)	(244)	(3,508)	(198)	(3,568)
Income (loss) before income taxes	(5,802)	(2,811)	(14,766)	(5,993)
Provision for (benefit from) income taxes	441	(33)	(272)	68
Net (loss) income	$ (6,243)	$ (2,778)	$ (14,494)	$ (6,061)
Net (loss) income per share - basic	$ (0.20)	$ (0.09)	$ (0.48)	$ (0.20)
Net (loss) income per share - diluted	$ (0.20)	$ (0.09)	$ (0.48)	$ (0.20)
Weighted average number of shares - basic	30,552	29,967	30,452	29,856
Weighted average number of shares - diluted	30,552	29,967	30,452	29,856
Cash dividends paid per common share	$ 0.08	$ 0.08	$ 0.16	$ 0.16