CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 20,170	$ 19,599	$ 58,004	$ 55,727
Cost of sales	11,540	11,644	34,034	32,429
Gross profit	8,630	7,955	23,970	23,298
Selling, general, and administrative expenses	3,910	3,883	10,945	11,638
Engineering expense	1,733	2,127	7,713	6,475
Operating income	2,987	1,945	5,312	5,185
Interest expense	17	80	209	316
Other expense - net	22	39	68	89
Income before incomes taxes	2,948	1,826	5,035	4,780
Income tax provision	1,239	767	2,115	2,008
Net income	$ 1,709	$ 1,059	$ 2,920	$ 2,772
Earnings per common share:
Basic net income per share	$ 0.18	$ 0.11	$ 0.31	$ 0.29
Diluted net income per share	$ 0.18	$ 0.11	$ 0.31	$ 0.29
Weighted-average basic shares outstanding	9,518,000	9,489,000	9,503,000	9,468,000
Weighted-average diluted shares outstanding	9,592,000	9,598,000	9,563,000	9,597,000