INVESTMENT ASSETS, NET - Additional Information (Details)	12 Months Ended
	Apr. 30, 2021 USD ($) ft²	Apr. 30, 2020 USD ($) ft²
Depreciation on buildings | $	$ 542,000	$ 517,000
Non-cash impairment charges on other assets | $		5,046,000
Amount of settlement received | $	650,000	$ 625,000
Amount of rent paid | $	$ 350,000
Warehouse and Office Buildings
Area of Land	61,000	143,000
Area of land sold	61,000
Retail Building
Area of land sold	14,000
Florida | Warehouse and Office Buildings
Area of Land	143,000	61,000
Area of land sold	61,000
New Mexico | Retail Building
Area of Land	14,000
Area of land of which construction in process	14,000
Area of land sold	14,000