INCOME TAXES (COMPONENTS OF DEFERRED TAX ASSETS AND LIABILITIES) (Details) - USD ($)	Apr. 30, 2016	Apr. 30, 2015
INCOME TAXES
Net operating loss carryforwards	$ 139,000	$ 467,000
Inventory valuation reserve	147,000	138,000
Loss on equity and impairment in investee	437,000	435,000
Tax credit carryforward	68,000	57,000
Other	238,000	174,000
Gross deferred income tax asset	1,029,000	1,271,000
Less: valuation allowance	(437,000)	(435,000)
Net deferred income tax assets	592,000	$ 836,000
Income Tax Uncertainties
Accrued interest or penalties related to uncertain tax positions	0
Expected change in the amount of unrecognized tax benefit, accrued interest or penalties within the next twelve months	$ 0