Consolidated Statement of Operations (USD $)	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Net sales	$ 3,485,000	$ 2,912,000
Cost of goods sold	2,178,000	2,030,000
Gross profit	1,307,000	882,000
Engineering	147,000	153,000
Selling, general and administrative	872,000	578,000
Operating Expenses	1,019,000	731,000
Earnings from operations	288,000	151,000
Interest expense, net	9,000	11,000
Earnings before provision for income taxes	279,000	140,000
Income Tax Expense (Benefit)	107,000	56,000
Net Income (Loss) Attributable to Parent	$ 172,000	$ 84,000
Earnings Per Share, Basic	$ 0.03	$ 0.02