Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net revenues	$ 87,684	$ 78,629	$ 171,226	$ 159,267
Cost of goods sold	60,897	53,174	117,893	109,818
Gross profit	26,787	25,455	53,333	49,449
Operating expenses:
Research, development and engineering	8,231	7,848	15,804	15,758
Selling, general and administrative	12,891	10,140	22,897	20,178
Amortization of acquisition-related intangible assets	597	696	1,193	1,713
Total operating expenses	21,719	18,684	39,894	37,649
Operating income	5,068	6,771	13,439	11,800
Other income (expense):
Interest income	89	53	168	115
Interest expense	(434)	(615)	(1,128)	(1,250)
Other income (expense), net	(190)	586	(705)	1,401
Income before income tax provision	4,533	6,795	11,774	12,066
Provision for income tax	(1,070)	(2,860)	(2,817)	(5,112)
Net income	$ 3,463	$ 3,935	$ 8,957	$ 6,954
Net income per share:
Basic (in dollars per share)	$ 0.11	$ 0.12	$ 0.28	$ 0.22
Diluted (in dollars per share)	0.10	0.12	0.27	0.22
Cash dividends per common share (in dollars per share)				$ 0.04
Weighted average shares used in per share calculation:
Basic (in shares)	32,642	31,490	32,364	31,447
Diluted (in shares)	34,099	32,145	33,572	32,074