Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 18,248	$ 16,540
Cost of sales	10,864	10,407
Gross profit	7,384	6,133
Selling, general, and administrative expenses	3,904	3,073
Engineering expense	2,285	1,556
Relocation expense		211
Operating income	1,195	1,293
Interest expense	134	214
Other expense - net	30	64
Income before incomes taxes	1,031	1,015
Income tax provision	433	426
Net income	$ 598	$ 589
Earnings per common share:
Basic net income per share	$ 0.06	$ 0.06
Diluted net income per share	$ 0.06	$ 0.06
Weighted-average basic shares outstanding	9,445,000	9,397,000
Weighted-average diluted shares outstanding	9,564,000	9,412,000