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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND COMPREHENSIVE INCOME (Parenthetical) (USD $)
12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND COMPREHENSIVE INCOME      
Issuance of Class A common shares, issuance cost   $ (2,430,995)  
Transfer to statements of operations of realized gains on available for sale securities, tax effect   1,607  
Net unrealized gains (losses) on available-for-sale securities, tax effect $ 30,474 $ (712) $ (28,177)