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Inventory (Tables)
6 Months Ended
Nov. 30, 2016
Inventory Disclosure [Abstract]  
Inventory
   November 30, 2016  May 31, 2016
Raw materials  $522,315   $511,530 
Work-in-process   9,434,672    8,639,068 
Finished goods   719,480    554,358 
Gross Inventory   10,676,467    9,704,956 
Less allowance for obsolescence   100,000    100,000 
Net Inventory  $10,576,467   $9,604,956