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Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (USD $)
Total
Common stock
Additional paid-in capital
Retained Earnings / (Accumulated Deficit)
Accumulated other comprehensive loss
Beginning Balance at Dec. 31, 2010 $ 171,718,270 $ 44,131 $ 120,391,622 $ 73,681,556 $ (22,399,039)
Beginning Balance (in shares) at Dec. 31, 2010   44,131,376      
Stock options exercised 885 1 884    
Stock options exercised (in shares)   590      
Stock-based compensation LTRP 33,710   33,710    
Dividend distribution (3,530,510)     (3,530,510)  
Change in redeemable amount of noncontrolling interest           
Net income 14,057,634     14,057,634  
Currency translation adjustment 888,874       888,874
Unrealized net gains on investments (18,200)       (18,200)
Realized net gain on investments (45,527)       (45,527)
Ending Balance at Mar. 31, 2011 183,105,136 44,132 120,426,216 84,208,680 (21,573,892)
Ending Balance (in shares) at Mar. 31, 2011   44,131,966      
Stock options exercised 10,290 5 10,285    
Stock options exercised (in shares)   5,360      
Stock-based compensation LTRP 15,536   15,536    
Dividend distribution (10,594,058)     (10,594,058)  
LTRP shares issued   5 (5)    
LTRP shares issued (in shares)   4,694      
Change in redeemable amount of noncontrolling interest (610,853)     (610,853)  
Net income 62,722,419     62,722,419  
Currency translation adjustment (16,412,311)       (16,412,311)
Unrealized net gains on investments 942,857       942,857
Realized net gain on investments           
Ending Balance at Dec. 31, 2011 219,179,016 44,142 120,452,032 135,726,188 (37,043,346)
Ending Balance (in shares) at Dec. 31, 2011   44,142,020      
Stock-based compensation LTRP 11,036   11,036    
Dividend distribution (4,812,036)     (4,812,036)  
LTRP shares issued   5 (5)    
LTRP shares issued (in shares)   5,100      
Change in redeemable amount of noncontrolling interest 316,298     316,298  
Net income 19,637,038     19,637,038  
Currency translation adjustment 3,579,147       3,579,147
Unrealized net gains on investments 693,974       693,974
Realized net gain on investments (924,657)       (924,657)
Ending Balance at Mar. 31, 2012 $ 237,679,816 $ 44,147 $ 120,463,063 $ 150,867,488 $ (33,694,882)
Ending Balance (in shares) at Mar. 31, 2012   44,147,120