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Property, Plant and Equipment (Tables)
3 Months Ended
Aug. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment

A summary of property, plant and equipment for Greystone is as follows:

 

    August 31, 2018     May 31, 2018  
Production machinery and equipment   $ 38,462,159     $ 35,270,326  
Plant buildings and land     5,855,140       5,739,491  
Leasehold improvements     735,601       534,637  
Furniture and fixtures     436,186       396,882  
      45,489,086       41,941,336  
                 
Less: Accumulated depreciation and amortization     (17,640,463 )     (16,587,460 )
                 
Net Property, Plant and Equipment   $ 27,848,623     $ 25,353,876