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Prepayment on property, plant and equipment (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Oct. 26, 2012
sqm
Prepayment on property, plant and equipment (Textual)      
Prepayment on property, plant and equipment $ 1,479,751 $ 1,492,098  
Entitlement of land use rights in Xushui County, Baoding plant     54,267