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OTHER INCOME (Details) - USD ($)
3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Other income $ 0 $ 300,000 $ 260,000 $ 950,000
Life insurance policy for a retired executive        
Other income     30,000  
Bankruptcy of a warranty provider        
Other income $ 0   185,000  
Forgiveness of debt        
Other income   $ 300,000 $ 45,000 300,000
Settlement Agreement        
Other income       $ 650,000