INVESTMENT ASSETS - Additional Information (Details)	3 Months Ended
	Jul. 31, 2020 USD ($) ft² a	Jul. 31, 2019 USD ($)	Apr. 30, 2020 a
Area of Land | a	12,000		12,000
Depreciation On Warehouse And Other Facilities | $	$ 122,000	$ 122,000
Florida
Area of Land | ft²	204,000