INCOME TAXES (COMPONENTS OF DEFERRED TAX ASSETS AND LIABILITIES) (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017
INCOME TAXES
Net operating loss carryforwards	$ 574,000	$ 420,000
Inventory valuation reserve	98,000	101,000
Loss on equity and impairment in investee	301,000	437,000
Tax credit carryforward	68,000	68,000
Other	115,000	158,000
Gross deferred income tax asset	1,156,000	1,184,000
Less: valuation allowance	(1,088,000)	(437,000)
Net deferred income tax assets	$ 68,000	$ 747,000