Annual report pursuant to Section 13 and 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 $)
Dec. 31, 2014
Dec. 31, 2013
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets $ 153,906,231us-gaap_DerivativeFairValueOfDerivativeAsset $ 3,218,257us-gaap_DerivativeFairValueOfDerivativeAsset
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0us-gaap_DerivativeAssetFairValueGrossLiability (1,409,962)us-gaap_DerivativeAssetFairValueGrossLiability
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 153,906,231us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral 1,808,295us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (579,070)us-gaap_DerivativeFairValueOfDerivativeLiability (21,166,816)us-gaap_DerivativeFairValueOfDerivativeLiability
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeLiabilityFairValueGrossAsset 1,409,962us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Amount of Assets Presented in Balance Sheet, Offsetting of Derivative Liabilities (579,070)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral (19,756,854)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 128,893,220us-gaap_DerivativeFairValueOfDerivativeAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentAssetsMember
629,178us-gaap_DerivativeFairValueOfDerivativeAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentAssetsMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0us-gaap_DerivativeAssetFairValueGrossLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentAssetsMember
(566,288)us-gaap_DerivativeAssetFairValueGrossLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentAssetsMember
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 128,893,220us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentAssetsMember
62,890us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentAssetsMember
Non Current Assets [Member]    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets 25,013,011us-gaap_DerivativeFairValueOfDerivativeAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentAssetsMember
2,589,079us-gaap_DerivativeFairValueOfDerivativeAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentAssetsMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Assets 0us-gaap_DerivativeAssetFairValueGrossLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentAssetsMember
(843,674)us-gaap_DerivativeAssetFairValueGrossLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentAssetsMember
Net Amounts of Assets Presented in the Balance Sheet, Offsetting of Derivative Assets 25,013,011us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentAssetsMember
1,745,405us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentAssetsMember
Current Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentLiabilitiesMember
(19,685,934)us-gaap_DerivativeFairValueOfDerivativeLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentLiabilitiesMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentLiabilitiesMember
566,288us-gaap_DerivativeLiabilityFairValueGrossAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentLiabilitiesMember
Net Amount of Assets Presented in Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentLiabilitiesMember
(19,119,646)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_CurrentLiabilitiesMember
Non Current Liabilities [Member]    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Assets, Offsetting of Derivative Liabilities (579,070)us-gaap_DerivativeFairValueOfDerivativeLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentLiabilitiesMember
(1,480,882)us-gaap_DerivativeFairValueOfDerivativeLiability
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentLiabilitiesMember
Gross Amounts Offset in the Balance Sheet, Offsetting of Derivative Liabilities 0us-gaap_DerivativeLiabilityFairValueGrossAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentLiabilitiesMember
843,674us-gaap_DerivativeLiabilityFairValueGrossAsset
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentLiabilitiesMember
Net Amount of Assets Presented in Balance Sheet, Offsetting of Derivative Liabilities $ (579,070)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentLiabilitiesMember
$ (637,208)us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ nog_BalanceSheetLocationOffsettingAssetAndLiabilitiesAxis
= nog_NonCurrentLiabilitiesMember