LEASE COMMITMENTS: (Details)	12 Months Ended
	Apr. 30, 2020 USD ($)
Other Commitments [Line Items]
Operating lease, right-of-use assets	$ 109,000
Operating Leases, Rent Expense	113,000
2021	92,000
2022	25,000
Total lease payments	117,000
Less: Imputed interest	4,000
Present value of lease liabilities	$ 113,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts Payable and Accrued Liabilities
Operating Lease, Weighted Average Remaining Lease Term	1 year 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	5.50%
Minimum [Member]
Other Commitments [Line Items]
Non-cancelable operating lease term (in years)	2 years
Maximum [Member]
Other Commitments [Line Items]
Non-cancelable operating lease term (in years)	5 years