Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Part 3 (Details)

v2.4.1.9
DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT, Part 3 (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets $ 139,096,440us-gaap_DerivativeFairValueOfDerivativeAsset $ 153,906,231us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0us-gaap_DerivativeAssetFairValueGrossLiability 0us-gaap_DerivativeAssetFairValueGrossLiability
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 139,096,440us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 153,906,231us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (100,646)us-gaap_DerivativeFairValueOfDerivativeLiability (579,070)us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeLiabilityFairValueGrossAsset 0us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Amount of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (100,646)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral (579,070)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 124,698,923us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentAssetsMember
128,893,220us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentAssetsMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentAssetsMember
0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentAssetsMember
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 124,698,923us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentAssetsMember
128,893,220us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentAssetsMember
Non Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 14,397,517us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentAssetsMember
25,013,011us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentAssetsMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentAssetsMember
0us-gaap_DerivativeAssetFairValueGrossLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentAssetsMember
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 14,397,517us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentAssetsMember
25,013,011us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentAssetsMember
Current Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (100,646)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentLiabilitiesMember
0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentLiabilitiesMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentLiabilitiesMember
0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentLiabilitiesMember
Net Amount of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities (100,646)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentLiabilitiesMember
0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_CurrentLiabilitiesMember
Non Current Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentLiabilitiesMember
(579,070)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentLiabilitiesMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentLiabilitiesMember
0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentLiabilitiesMember
Net Amount of Assets Presented in the Balance Sheet, Offsetting of Derivative Liabilities $ 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentLiabilitiesMember
$ (579,070)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_BalanceSheetLocationAxis
= nog_NonCurrentLiabilitiesMember