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Prepayment on Property, Plant and Equipment (Details) (USD $)
Mar. 31, 2015
sqm
Dec. 31, 2014
Prepayment on property, plant and equipment (Textual)    
Prepayment on property, plant and equipment $ 1,484,810us-gaap_PrepaidExpenseOtherNoncurrent $ 1,490,440us-gaap_PrepaidExpenseOtherNoncurrent
Entitlement of land use rights in Xushui County, Baoding plant 65,023onp_EntitlementOfLandUseRights