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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY AND COMPREHENSIVE INCOME (Parenthetical) (USD $) | 12 Months Ended
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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)

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