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Revenue and Revenue Recognition (Tables)
6 Months Ended
Nov. 30, 2020
Revenue from Contract with Customer [Abstract]  
Schedule of Sale of Revenues for Customer Categories

Sales to the following categories of customers for the six months ended November 30, 2020 and 2019, respectively, were as follows:

 

Category   2020     2019  
End User Customers     86 %     89 %
Distributors     14 %     11 %