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Loans Payable (Details 1) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Schedule of future minimum capital lease payments    
2016 $ 12,425,754us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears  
2017 4,134,173us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears  
Capital Leases, Future Payments 16,559,927us-gaap_CapitalLeasesFutureMinimumPaymentsDue  
Unearned discount on capital lease (588,183)onp_UnearnedDiscountOnCapitalLease  
Long-term debt and capital lease obligations, including current maturities 15,971,744us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities  
Less: Current portion of obligation under capital lease, net 11,898,798us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent  
Long-term obligations under capital lease $ 4,072,946us-gaap_LongTermDebtAndCapitalLeaseObligations $ 4,090,413us-gaap_LongTermDebtAndCapitalLeaseObligations