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Revenue (Tables)
12 Months Ended
May 31, 2020
Revenue from Contract with Customer [Abstract]  
Schedule of Sale of Revenues for Customer Categories

Sales to the following categories of customers for the fiscal years 2020 and 2019, respectively, were as follows:

 

Category   2020     2019  
Major customers (end users)     87 %     86 %
Distributors     13 %     14 %