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Revenue and Revenue Recognition (Tables)
9 Months Ended
Feb. 28, 2019
Revenue Recognition and Deferred Revenue [Abstract]  
Schedule of Sale of Revenues for Customer Categories

Sales to the following categories of customers for the nine months ended February 28, 2019 and 2018, respectively, were as follows:

 

Category   2019     2018  
Major customers (end users)     85 %     76 %
Distributors     14 %     22 %
Total     99 %     98 %