CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 13,562,000	$ 13,100,000
Cost of goods sold	9,287,000	8,508,000
Gross profit	4,275,000	4,592,000
Operating expenses:
Engineering	745,000	602,000
Selling, general and administrative	3,217,000	3,187,000
Operating Expenses	3,962,000	3,789,000
Earnings from operations	313,000	803,000
Other expense (income):
Interest expense, net	28,000	34,000
Earnings (loss) before provision for income taxes	285,000	769,000
Provision (benefit) for income taxes	165,000	(103,000)
Net earnings (loss)	$ 120,000	$ 872,000
Basic earnings per share	$ 0.02	$ 0.15