Revenue and Revenue Recognition (Tables)

6 Months Ended

Nov. 30, 2019

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, 2019 and 2018, respectively, were as follows:

Category	2019			2018
End Users – Major Customers		88	%		84	%
End Users - Other		1	%		2	%
Distributors		11	%		14	%