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OTHER ASSETS - Additional Information (Details)
3 Months Ended 9 Months Ended
Jan. 31, 2022
USD ($)
ft²
Jan. 31, 2021
USD ($)
Jan. 31, 2022
USD ($)
ft²
Jan. 31, 2021
USD ($)
Aug. 31, 2021
ft²
Area of Land | ft² 143,000   143,000    
Office building          
Area of Land | ft²         7,000
Property and equipment | Right of use assets          
Amortization of leased cost | $ $ 8,000 $ 41,000 $ 46,000 $ 83,000  
Right of use assets          
Depreciation expense associated with property and equipment | $ $ 14,000 $ 2,000 $ 17,000 $ 9,000