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BORROWINGS (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Bank Borrowings    
Short-term bank borrowings $ 800,808,595 $ 629,688,722
Long-term Loans due within one year 17,481,257 113,998,340
Subtotal for short-term 818,289,852 743,687,062
Borrowings from non-banking financial institutions, subtotal 40,636,880  
Debt, Current 858,926,732 743,687,062
Average interest rate on short term borrowings (as a percent) 4.60% 5.16%
Borrowings secured by restricted cash
    
Bank Borrowings    
Short-term bank borrowings 175,289,355 74,873,390
Borrowings secured by inventory
    
Bank Borrowings    
Short-term bank borrowings 79,548,166 15,767,880
Long-term Loans due within one year   15,600,000
Borrowings guaranteed by Dr. Shawn Qu
    
Bank Borrowings    
Short-term bank borrowings 66,349,563 33,328,470
Borrowings secured by land use right and property, plant and equipment
    
Bank Borrowings    
Short-term bank borrowings 231,676,935 39,295,970
Bank notes
    
Bank Borrowings    
Short-term bank borrowings 21,825,595  
Borrowings from non-banking financial institutions, subtotal 35,855,470  
Unsecured
    
Bank Borrowings    
Short-term bank borrowings 226,118,981 466,423,012
Long-term Loans due within one year 3,958,069 82,527,640
Loans secured by property, plant and equipment
    
Bank Borrowings    
Long-term Loans due within one year 13,523,188 15,870,700
Borrowings secured by related parties
    
Bank Borrowings    
Borrowings from non-banking financial institutions, subtotal $ 4,781,410