CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Common Stock	Excess of Par Value	Accumulated Deficit	Total
Balance beginning of year at Apr. 30, 2018	$ 60,000	$ 12,437,000	$ (8,743,000)	$ 3,754,000
Balance beginning of year (in shares) at Apr. 30, 2018	5,995,750			5,995,750
Stock compensation earned		108,000		$ 108,000
Net income			642,000	642,000
Cumulative effect of adoption of new accounting principle | ASU 2014-09			102,000	102,000
Balance end of year at Apr. 30, 2019	$ 60,000	12,545,000	(7,999,000)	$ 4,606,000
Balance end of year (in shares) at Apr. 30, 2019	5,995,750			5,995,750
Stock compensation earned		108,000		$ 108,000
Net income			714,000	714,000
Balance end of year at Apr. 30, 2020	$ 60,000	$ 12,653,000	$ (7,285,000)	$ 5,428,000
Balance end of year (in shares) at Apr. 30, 2020	5,995,750			5,995,750