OTHER ASSETS (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Apr. 30, 2021
OTHER ASSETS
Prepaid expenses	$ 501	$ 324
Receivables	30	37
Right-of-use assets associated with leases of office facilities	60	84
Other assets	172	172
Property and equipment	222	222
Less accumulated depreciation	(194)	(194)
Property, plant and equipment, net	28	28
Other Assets	$ 791	$ 645