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Prepayments and other current assets (Tables)
9 Months Ended
Sep. 30, 2012
Prepayments and other current assets [Abstract]  
Prepayment and Other Current Assets
    September 30,
2012
    December 31,
2011
 
Prepaid AMEX annual fee   $ 13,750     $ 18,125  
Recoverable VAT     4,096,136       4,776,962  
Prepaid insurance     111,844       61,357  
Prepayment for purchase of materials     75,476       206,930  
Others     6,027       7,841  
    $ 4,303,233     $ 5,071,215