Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES (Details)

v2.4.1.9
SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Cash and Cash Equivalents [Abstract]      
Threshold amount of FDIC coverage $ 250,000nog_ThresholdAmountOfFdicCoverage    
Accounts Receivable [Abstract]      
Allowance for doubtful accounts 2,340,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent   1,840,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Advance to Operators [Abstract]      
Period for advance payments to be applied against joint interest billings 90 days    
Property, Plant and Equipment [Line Items]      
Depreciation expense 79,775us-gaap_DepreciationAndAmortization 79,668us-gaap_DepreciationAndAmortization  
Full Cost Method [Abstract]      
Capitalized Certain Payroll and Other Internal Costs 425,428nog_CapitalizedCertainPayrollAndOtherInternalCosts 648,876nog_CapitalizedCertainPayrollAndOtherInternalCosts  
Capitalized Interest Cost 737,750us-gaap_InterestCostsCapitalized 1,197,410us-gaap_InterestCostsCapitalized  
Total 1,163,178nog_TotalCapitalizedCostsOilAndGasProducingActivities 1,846,286nog_TotalCapitalizedCostsOilAndGasProducingActivities  
Minimum percentage of proved reserves sold to be considered a significant alteration (in hundredths) 25.00%nog_PercentageOfProvedReservesSoldToBeConsideredSignificantAlteration    
Impairment of Oil and Natural Gas Properties 360,428,962us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties  
Capitalized costs related to expired leases subject to depletion 5,500,000nog_CapitalizedCostsRelatedToExpiredLeasesSubjectToDepletion 7,300,000nog_CapitalizedCostsRelatedToExpiredLeasesSubjectToDepletion  
Discount rate (in hundredths) 10.00%nog_CrudeOilAndNaturalGasPropertiesDiscountRate    
Debt Issuance Costs [Abstract]      
Amortization of debt issuance costs 722,144us-gaap_AmortizationOfFinancingCosts 634,592us-gaap_AmortizationOfFinancingCosts  
Rate of Senior notes (in hundredths) 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
Amortization of bond premium 371,681nog_AmortizationOfBondPremium 371,681nog_AmortizationOfBondPremium  
Income Taxes [Abstract]      
Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance   0us-gaap_DeferredTaxAssetsValuationAllowance
Net Income Per Common Share [Abstract]      
Weighted Average Common Shares Outstanding - Basic (in shares) 60,556,180us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 61,203,725us-gaap_WeightedAverageNumberOfSharesOutstandingBasic  
Plus: Potentially Dilutive Common Shares Including Stock Options and Restricted Stock (in shares) 0nog_IncrementalCommonSharesAttributableToStockOptionsAndWarrantsAndRestrictedShares 242,549nog_IncrementalCommonSharesAttributableToStockOptionsAndWarrantsAndRestrictedShares  
Weighted Average Common Shares Outstanding - Diluted (in shares) 60,556,180us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 61,446,274us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding  
Restricted Stock Excluded from EPS due to the Anti-Dilutive Effect (in shares) 144,420us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 5,213us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Senior Unsecured Notes [Member]      
Debt Issuance Costs [Abstract]      
Capitalized costs in connection with debt $ 10,500,000nog_CapitalizedCostsInConnectionWithDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Rate of Senior notes (in hundredths) 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Minimum [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 3 years    
Maximum [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, estimated useful lives 7 years