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Other Payables and Accrued Liabilities (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Summary of other payables and accrued liabilities    
Accrued electricity $ 401,774us-gaap_AccruedUtilitiesCurrent $ 334,212us-gaap_AccruedUtilitiesCurrent
Value-added tax payable 80,168onp_ValueAddedTaxesPayableCurrent 841,556onp_ValueAddedTaxesPayableCurrent
Accrued interest to a related party 940,563us-gaap_InterestPayableCurrent 761,242us-gaap_InterestPayableCurrent
Accrued bank loan interest 25,425onp_InterestPayableToRelatedPartyCurrent   
Payable for purchase of equipment 1,870,847us-gaap_AccountsPayableOtherCurrent 244,050us-gaap_AccountsPayableOtherCurrent
Others 187,906us-gaap_OtherAccruedLiabilitiesCurrent 219,463us-gaap_OtherAccruedLiabilitiesCurrent
Totals $ 3,506,683us-gaap_OtherAccountsPayableAndAccruedLiabilities $ 2,400,523us-gaap_OtherAccountsPayableAndAccruedLiabilities