OTHER REVENUES: (Details) - USD ($)	12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
OTHER REVENUES:
Oil & gas royalty	$ 608,000	$ 0
Private infrastructure reimbursement covenants	324,000
Public improvement district reimbursements	113,000
Other revenue	301,000	441,000
Other Revenue, Net	$ 1,346,000	$ 441,000