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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Inventories - USD ($)
May 31, 2019
May 31, 2018
Inventories [Abstract]    
Raw materials $ 1,208,000 $ 1,000,000
Work in progress 771,000 854,000
Finished products 172,000 325,000
Total $ 2,151,090 $ 2,178,777