CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 20,555,000	$ 18,396,000
Cost of goods sold	13,591,000	13,615,000
Gross profit	6,964,000	4,781,000
Operating expenses:
Engineering	1,316,000	1,082,000
Selling, general and administrative	4,881,000	4,967,000
Operating expenses	6,197,000	6,049,000
Income (loss) from operations	767,000	(1,268,000)
Other expense:
Interest expense, net	112,000	74,000
Gain on asset disposal		(8,000)
Income (loss) before income tax expense	655,000	(1,334,000)
Income tax expense	13,000	681,000
Net income (loss)	$ 642,000	$ (2,015,000)
Basic earnings (loss) per share	$ 0.11	$ (0.38)