Annual report pursuant to Section 13 and 15(d)

OPERATING LEASES (Details)

v2.4.1.9
OPERATING LEASES (Details) (USD $)
1 Months Ended 12 Months Ended
Oct. 31, 2014
sqft
Nov. 30, 2011
Lease
sqft
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Vehicles [Member]          
Operating Leased Assets [Line Items]          
Lease expense     $ 30,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
$ 28,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
$ 48,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
Vehicles [Abstract]          
2015     45,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
2016     45,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
2017     41,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
2018     30,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
Future minimum lease payments [Abstract]          
2015     45,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
2016     45,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
2017     41,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
   
Building [Member]          
Operating Leased Assets [Line Items]          
Lease expense 15,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
  267,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
249,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
217,000us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Vehicles [Abstract]          
2015     269,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
2016     58,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
2017     54,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
Buildings [Abstract]          
Total square feet of office space leased 1,900us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
4,653us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
     
Number of leases   2nog_NumberOfLeases
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
     
Initial gross monthly lease payments 4,750nog_InitialGrossMonthlyLeasePayments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
18,612nog_InitialGrossMonthlyLeasePayments
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
     
Percentage increase on each anniversary date (in hundredths) 2.00%nog_LeasesPayablePercentageAnnualIncrease
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
4.00%nog_LeasesPayablePercentageAnnualIncrease
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
     
Number of months rent prepaid   3 months      
Lease Expiration date Nov. 30, 2017 Nov. 30, 2015      
Rent paid in advance as security deposit   53,553us-gaap_DepositsAssetsNoncurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
     
Future minimum lease payments [Abstract]          
2015     269,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
2016     58,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
2017     54,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
Total     381,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
   
Initial Building [Member]          
Buildings [Abstract]          
Total square feet of office space leased     3,044us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nog_InitialBuildingMember
   
Future minimum lease payments [Abstract]          
Landlord incentives     91,320us-gaap_IncentiveFromLessor
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nog_InitialBuildingMember
   
Additional Building [Member]          
Buildings [Abstract]          
Total square feet of office space leased     1,609us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nog_AdditionalBuildingMember
   
Future minimum lease payments [Abstract]          
Landlord incentives     $ 58,620us-gaap_IncentiveFromLessor
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nog_AdditionalBuildingMember