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INTANGIBLE ASSETS, NET (Details) - Intangible assets, net - USD ($)
May 31, 2016
May 31, 2015
Intangible assets, net [Abstract]    
Patents and licenses $ 509,485 $ 505,849
Less accumulated amortization (260,684) (184,545)
Intangible Assets, Net $ 248,801 $ 321,304