OTHER ASSETS - Additional Information (Details) - USD ($)	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Apr. 30, 2021
Right-of-use assets associated with leases of office facilities	$ 60,000		$ 84,000
Property, Plant and Equipment
Right-of-use assets associated with leases of office facilities	24,000	$ 26,000
Right of use assets
Depreciation expense associated with property and equipment	$ 1,000	$ 7,000