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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Inventories - USD ($)
May 31, 2018
May 31, 2017
Inventories [Abstract]    
Raw materials $ 1,000,000 $ 830,000
Work in progress 854,000 728,000
Finished products 325,000 171,000
Total $ 2,178,777 $ 1,729,121