CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net sales	$ 19,795	$ 17,919
Cost of sales	10,769	12,353
Gross profit	9,026	5,566
Selling, general, and administrative expenses	3,316	3,961
Engineering expense	1,827	1,825
Operating income (loss)	3,883	(220)
Interest expense	8	8
Other expense – net	68	29
Income (loss) before income taxes	3,807	(257)
Income tax provision (benefit)	1,421	(95)
Net income (loss)	$ 2,386	$ (162)
Earnings (loss) per common share:
Basic net income (loss) per share	$ 0.24	$ (0.02)
Diluted net income (loss) per share	$ 0.24	$ (0.02)
Weighted-average basic shares outstanding	9,842,000	9,715,000
Weighted-average diluted shares outstanding	10,010,000	9,715,000