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Revenue (Tables)
12 Months Ended
May 31, 2019
Revenue Recognition and Deferred Revenue [Abstract]  
Schedule of Sale of Revenues for Customer Categories

Sales to the following categories of customers for the fiscal years 2019 and 2018, respectively, were as follows:

 

Category  2019   2018 
Major customers (end users)   86%   78%
Distributors   14%   22%