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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES (Concentration of Credit Risk) (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Concentration of credit risk      
Accounts receivable, allowance for doubtful accounts $ 7,160,782 $ 1,592,467  
Accounts receivable 9,909,662 27,822,799  
Sales [Member]
     
Concentration of credit risk      
Concentration risk, percentage 30.00% 25.00% 50.00%
Customer A [Member]
     
Concentration of credit risk      
Accounts receivable    [1] 12,529,889  
Customer C [Member]
     
Concentration of credit risk      
Accounts receivable 1,225,831 3,568,910  
Customer D [Member]
     
Concentration of credit risk      
Accounts receivable 3,673,455    [1]  
Customer K [Member]
     
Concentration of credit risk      
Accounts receivable $ 1,507,576     
[1] Represents less than 10%