CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 26,133,000	$ 20,555,000
Cost of goods sold	17,124,000	13,591,000
Gross profit	9,009,000	6,964,000
Operating expenses:
Engineering	1,462,000	1,316,000
Selling, general and administrative	6,662,000	4,881,000
Operating expenses	8,124,000	6,197,000
Income from operations	885,000	767,000
Other expense:
Interest expense, net	96,000	112,000
Income before income tax expense	789,000	655,000
Income tax expense	75,000	13,000
Net income	$ 714,000	$ 642,000
Basic earnings per share	$ 0.12	$ 0.11