OTHER ASSETS - Additional Information (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Right-of-use assets associated with leases of office facilities	$ 84,000	$ 109,000
Right of use assets
Right-of-use assets associated with leases of office facilities	84,000	109,000
Amortization of leased cost	85,000	104,000
Depreciation expense associated with property and equipment	$ 11,000	$ 20,000