CONSOLIDATED STATEMENT 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	$ (6,729,000)	$ 5,660,000
Balance beginning of year (in shares) at Apr. 30, 2017	5,995,750			5,995,750
Stock compensation earned		81,000		$ 81,000
Net loss			(671,000)	(671,000)
Balance end of year at Jan. 31, 2018	$ 60,000	12,410,000	(7,400,000)	$ 5,070,000
Balance end of year (in shares) at Jan. 31, 2018	5,995,750			5,995,750
Balance beginning of year at Oct. 31, 2017	$ 60,000	12,383,000	(7,093,000)	$ 5,350,000
Balance beginning of year (in shares) at Oct. 31, 2017	5,995,750
Stock compensation earned		27,000		27,000
Net loss			(307,000)	(307,000)
Balance end of year at Jan. 31, 2018	$ 60,000	12,410,000	(7,400,000)	$ 5,070,000
Balance end of year (in shares) at Jan. 31, 2018	5,995,750			5,995,750
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		81,000		$ 81,000
Net loss			(417,000)	(417,000)
Balance end of year at Jan. 31, 2019	$ 60,000	12,518,000	(9,058,000)	$ 3,520,000
Balance end of year (in shares) at Jan. 31, 2019	5,995,750			5,995,750
Balance beginning of year at Oct. 31, 2018	$ 60,000	12,491,000	(8,652,000)	$ 3,899,000
Balance beginning of year (in shares) at Oct. 31, 2018	5,995,750
Stock compensation earned		27,000		27,000
Net loss			(406,000)	(406,000)
Balance end of year at Jan. 31, 2019	$ 60,000	$ 12,518,000	(9,058,000)	$ 3,520,000
Balance end of year (in shares) at Jan. 31, 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