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Inventory (Details) - USD ($)
Nov. 30, 2016
May 31, 2016
Inventory, net    
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