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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)
12 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
Property and equipment, net      
Purchase of property and equipment $ 6,163,284 $ 72,631,938 $ 5,164,709
Building
     
Property and equipment, net      
Purchase of property and equipment $ 922,713 $ 62,474,175 $ 0