CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 4,054,000	$ 2,695,000
Cost of goods sold	2,764,000	1,857,000
Gross profit	1,290,000	838,000
Operating expenses:
Engineering	189,000	177,000
Selling, general and administrative	995,000	841,000
Operating Expenses	1,184,000	1,018,000
Earnings from operations	106,000	(180,000)
Other expense (income):
Interest expense, net	6,000	7,000
Earnings (loss) before provision for income taxes	100,000	(187,000)
Provision (benefit) for income taxes	39,000	(72,000)
Net earnings (loss)	$ 61,000	$ (115,000)
Basic earnings per share	$ 0.01	$ (0.02)