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Revenue and Revenue Recognition (Tables)
3 Months Ended
Aug. 31, 2019
Revenue from Contract with Customer [Abstract]  
Schedule of Sale of Revenues for Customer Categories

Sales to the following categories of customers for the three months ended August 31, 2019 and 2018, respectively, were as follows:

 

Category  2019   2018 
Major customers (end users)   87%   84%
Distributors   12%   14%