RIGHT-OF-USE ASSETS AND LEASE LIABILITIES (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Disclosure Text Block [Abstract]
Operating Leases, Rent Expense	$ 500,000	$ 504,000	$ 1,500,000	$ 1,500,000
Operating Lease, Weighted Average Remaining Lease Term	7 years 219 days		7 years 219 days
Operating Lease, Weighted Average Discount Rate, Percent	6.17%		6.17%