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Prepayments and Other Current Assets (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Summary of prepayments and other current assets    
Prepaid AMEX annual fee $ 22,500 $ 6,875
Recoverable VAT 3,991,529 4,784,074
Prepaid insurance 184,587 55,922
Prepayment for purchase of materials 16,199 77,445
Prepaid land lease 194,389 475,541
Others 268 1,848
Prepayments and other current assets, Total $ 4,409,472 $ 5,401,705