OTHER ASSETS (Details) - USD ($)	Apr. 30, 2021	Apr. 30, 2020
OTHER ASSETS
Prepaid expenses	$ 324,000	$ 464,000
Receivables	37,000	156,000
Right-of-use assets associated with leases of office facilities	84,000	109,000
Other assets	172,000	170,000
Property and equipment	222,000	217,000
Less accumulated depreciation	(194,000)	(182,000)
Property and equipment, net	28,000	35,000
Other Assets	$ 645,000	$ 934,000