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FAIR VALUE MEASUREMENT (Details 2) (Not designated as hedging instruments, USD $)
Dec. 31, 2012
Dec. 31, 2011
Effect of fair values of derivative instruments on the consolidated balance sheets    
Total derivatives asset $ 1,350,657 $ 2,726,538
Total derivatives liability 365,226  
Foreign exchange option contracts
    
Effect of fair values of derivative instruments on the consolidated balance sheets    
Total derivatives asset 100,837 479,333
Foreign exchange forward contracts
    
Effect of fair values of derivative instruments on the consolidated balance sheets    
Total derivatives asset 1,249,820 2,247,205
Total derivatives liability $ 365,226