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Prepayment on property, plant and equipment (Details) (USD $)
Jun. 30, 2013
sqm
Dec. 31, 2012
Prepayment on property, plant and equipment (Textual)    
Prepayment on property, plant and equipment $ 1,477,354 $ 1,445,645
Entitlement of land use rights in Xushui County, Baoding plant 54,267