Statement of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net revenues	$ 71,186	$ 80,857
Cost of goods sold	50,049	53,784
Gross profit	21,137	27,073
Operating expenses:
Research, development and engineering	7,687	6,930
Selling, general and administrative	10,043	10,790
Amortization of acquisition-related intangible assets	246	640
Total operating expenses	17,976	18,360
Operating income	3,161	8,713
Other income (expense):
Interest income	39	84
Interest expense	(212)	(257)
Other income (expense), net	(83)	701
Income before income tax provision	2,905	9,241
Provision for income tax	(926)	(3,234)
Net income	$ 1,979	$ 6,007
Net income per share:
Basic	$ 0.06	$ 0.19
Diluted	$ 0.06	$ 0.19
Cash dividends per common share	$ 0.03	$ 0
Weighted average shares used in per share calculation:
Basic	30,948	31,351
Diluted	31,635	32,378