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Related Party Transactions (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Related Party Transaction [Line Items]        
Due to related parties $ 4,000   $ 4,000  
Board Member One | Board Member        
Related Party Transaction [Line Items]        
Related party transaction, amounts of transaction 15,000 $ 18,000 33,000 $ 36,000
Board Member Two | Board Member        
Related Party Transaction [Line Items]        
Related party transaction, amounts of transaction $ 3,900 $ 14,000 $ 9,500 $ 29,000