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Inventories (Details) (USD $)
Feb. 28, 2013
Feb. 29, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 47,189,000 $ 44,008,000
Work-in-process 32,041,000 13,860,000
Finished goods 3,101,000 2,413,000
Total Inventory $ 82,330,926 $ 60,281,130