CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)	Common Stock	Capital in 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		54,000		$ 54,000
Net income (loss)			(11,000)	(11,000)
Balance end of year at Oct. 31, 2018	$ 60,000	12,491,000	(8,652,000)	$ 3,899,000
Balance end of year (in shares) at Oct. 31, 2018	5,995,750			5,995,750
Balance beginning of year at Jul. 31, 2018	$ 60,000	12,464,000	(8,684,000)	$ 3,840,000
Balance beginning of year (in shares) at Jul. 31, 2018	5,995,750
Stock compensation earned		27,000		27,000
Net income (loss)			32,000	32,000
Balance end of year at Oct. 31, 2018	$ 60,000	12,491,000	(8,652,000)	$ 3,899,000
Balance end of year (in shares) at Oct. 31, 2018	5,995,750			5,995,750
Cumulative effect of adoption of new accounting principle (see Note 1)			102,000	$ 102,000
Balance beginning of year at Apr. 30, 2019	$ 60,000	12,545,000	(7,999,000)	$ 4,606,000
Balance beginning of year (in shares) at Apr. 30, 2019	5,995,750			5,995,750
Stock compensation earned		54,000		$ 54,000
Net income (loss)			750,000	750,000
Balance end of year at Oct. 31, 2019	$ 60,000	12,599,000	(7,249,000)	$ 5,410,000
Balance end of year (in shares) at Oct. 31, 2019	5,995,750			5,995,750
Balance beginning of year at Jul. 31, 2019	$ 60,000	12,572,000	(7,555,000)	$ 5,077,000
Balance beginning of year (in shares) at Jul. 31, 2019	5,995,750
Stock compensation earned		27,000		27,000
Net income (loss)			306,000	306,000
Balance end of year at Oct. 31, 2019	$ 60,000	$ 12,599,000	$ (7,249,000)	$ 5,410,000
Balance end of year (in shares) at Oct. 31, 2019	5,995,750			5,995,750