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Prepayments and Other Current Assets (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Summary of prepayments and other current assets    
Prepaid NYSE MKT annual listing fee $ 30,000 $ 6,875
Recoverable VAT 4,048,973 4,784,074
Prepaid insurance    55,922
Prepayment for purchase of materials 7,979 77,445
Prepaid land lease 335,110 475,541
Others 1,063 1,848
Prepayments and other current assets $ 4,423,125 $ 5,401,705