Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net revenues	$ 80,257	$ 86,435	$ 162,304	$ 174,515
Cost of goods sold	54,245	60,265	110,690	123,345
Gross profit	26,012	26,170	51,614	51,170
Operating expenses:
Research, development and engineering	7,804	6,948	15,487	14,198
Selling, general and administrative	9,801	10,713	20,437	21,477
Amortization of acquired intangible assets	1,374	1,419	2,953	3,126
Total operating expenses	18,979	19,080	38,877	38,801
Operating income	7,033	7,090	12,737	12,369
Other income (expense):
Interest income	39	49	86	96
Interest expense	(284)	(322)	(598)	(732)
Other income (expense), net	(1,010)	2,165	(1,800)	2,373
Income before income tax provision	5,778	8,982	10,425	14,106
Provision for income tax	(2,505)	(3,235)	(4,167)	(4,784)
Net income	$ 3,273	$ 5,747	$ 6,258	$ 9,322
Net income per share:
Basic (in dollars per share)	$ 0.10	$ 0.18	$ 0.20	$ 0.30
Diluted (in dollars per share)	0.10	0.18	0.19	0.29
Cash dividends per common share (in dollars per share)	$ 0.04	$ 0.035	$ 0.075	$ 0.065
Weighted average shares used in per share calculation:
Basic (in shares)	31,651	31,499	31,769	31,439
Diluted (in shares)	32,380	32,235	32,627	32,142