CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Common Stock	Excess of Par Value	Accumulated Deficit	Total
Balance beginning of year at Apr. 30, 2017	$ 60,000	$ 12,329,000	$ (6,728,000)	$ 5,661,000
Balance beginning of year (in shares) at Apr. 30, 2017	5,995,750			5,995,750
Stock compensation earned		108,000		$ 108,000
Net income (loss)			(2,015,000)	(2,015,000)
Balance end of year at Apr. 30, 2018	$ 60,000	12,437,000	(8,743,000)	$ 3,754,000
Balance end of year (in shares) at Apr. 30, 2018	5,995,750			5,995,750
Stock compensation earned		108,000		$ 108,000
Net income (loss)			642,000	642,000
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
Cumulative effect of adoption of new accounting principle (see Note 1) | ASU 2014-09			$ 102,000	$ 102,000