OTHER INCOME (Details)	3 Months Ended		9 Months Ended
	Jan. 31, 2023 USD ($) a	Jan. 31, 2022 USD ($)	Jan. 31, 2023 USD ($) a	Jan. 31, 2022 USD ($)
Surface acres of land held | a	147		147
Other income	$ 1,803,000	$ 0	$ 1,803,000	$ 260,000
Life insurance policy for a retired executive
Other income				30,000
Minerals and mineral rights
Other operating income	$ 1,803,000		$ 1,803,000
Bankruptcy of a warranty provider
Other income				185,000
Forgiveness of debt
Other income				$ 45,000