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OTHER ASSETS - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
OTHER ASSETS        
Depreciation expense associated with property and equipment $ 2,000 $ 5,000 $ 8,000 $ 9,000