Consolidated Statement of Operations (USD $)	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Net sales	$ 2,912,000	$ 2,548,000
Cost of goods sold	2,030,000	1,908,000
Gross profit	882,000	640,000
Engineering	153,000	166,000
Selling, general and administrative	578,000	721,000
Operating Expenses	731,000	887,000
Earnings from operations	151,000	(247,000)
Interest expense, net	11,000	12,000
Earnings before provision for income taxes	140,000	(259,000)
Income Tax Expense (Benefit)	56,000	0
Net Income (Loss) Attributable to Parent	$ 84,000	$ (259,000)
Earnings Per Share, Basic	$ 0.02	$ (0.05)