OTHER INCOME (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Other income	$ 30,000	$ 0	$ 260,000	$ 650,000
Life insurance policy for a retired executive
Other income	$ 30,000
Bankruptcy of a warranty provider
Other income			185,000
Forgiveness of debt
Other income			$ 45,000
Settlement Agreement
Other income				$ 650,000