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Prepayments and Other Current Assets (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Summary of prepayments and other current assets    
Prepaid NYSE MKT annual fee $ 26,250onp_PrepaidStockMarketFee $ 7,500onp_PrepaidStockMarketFee
Recoverable VAT 375,000us-gaap_ValueAddedTaxReceivableCurrent 250,000us-gaap_ValueAddedTaxReceivableCurrent
Prepaid insurance    55,000us-gaap_PrepaidInsurance
Prepayment for purchase of materials    1,910,643us-gaap_OtherPrepaidExpenseCurrent
Prepaid land lease 341,897onp_PrepaidLandLease 490,276onp_PrepaidLandLease
Others 198,104us-gaap_OtherAssetsCurrent 206,249us-gaap_OtherAssetsCurrent
Totals $ 941,251us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 2,919,668us-gaap_PrepaidExpenseAndOtherAssetsCurrent