CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($)	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 4,473,000	$ 4,529,000
Cost of goods sold	2,994,000	3,273,000
Gross profit	1,479,000	1,256,000
Operating expenses:
Engineering	302,000	266,000
Selling, general and administrative	1,211,000	1,286,000
Operating expenses	1,513,000	1,552,000
Loss from operations	(34,000)	(296,000)
Other expense:
Interest expense, net	24,000	11,000
Loss before benefit for income taxes	(58,000)	(307,000)
Benefit for income taxes	(15,000)	(114,000)
Net loss	$ (43,000)	$ (193,000)
Basic loss per share	$ (0.01)	$ (0.04)