Consolidated Statement of Operations (USD $)	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Net sales	$ 3,381,000	$ 2,988,000	$ 6,866,000	$ 5,900,000
Cost of goods sold	2,087,000	1,727,000	4,265,000	3,757,000
Gross profit	1,294,000	1,261,000	2,601,000	2,143,000
Engineering	140,000	145,000	287,000	298,000
Selling, general and administrative	893,000	610,000	1,765,000	1,188,000
Operating Expenses	1,033,000	755,000	2,052,000	1,486,000
Earnings from operations	261,000	506,000	549,000	657,000
Interest expense, net	9,000	11,000	18,000	22,000
Earnings before provision for income taxes	252,000	495,000	531,000	635,000
Income Tax Expense (Benefit)	96,000	198,000	203,000	254,000
Net Income (Loss) Attributable to Parent	$ 156,000	$ 297,000	$ 328,000	$ 381,000
Earnings Per Share, Basic	$ 0.03	$ 0.05	$ 0.06	$ 0.07