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Prepayments and other current assets (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Prepayments and other current assets [Abstract]    
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
Prepayments and other current assets $ 4,303,233 $ 5,071,215