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Inventories (Details) (USD $)
Feb. 28, 2014
Feb. 28, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 64,817,000 $ 47,189,000
Work-in-process 39,781,000 32,041,000
Finished goods 2,983,000 3,101,000
Total Inventory $ 107,580,845 $ 82,330,926