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Real Estate Transactions (Acquisitions of Properties) (Details) (USD $) | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | May 31, 2014 sqft | Aug. 31, 2014 sqft | Dec. 31, 2014 sqft | Dec. 31, 2013
Real Estate Properties [Line Items] |  |  |  |  |
Promissory note issued for property acquired | $ 123,899,298 us-gaap_NotesPayable |  |  | $ 123,899,298 us-gaap_NotesPayable | $ 89,551,724 us-gaap_NotesPayable
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 8,348,830 netr_RealEstateAcquisitionsOfLand |  |  |  |
Buildings and other | 42,279,315 us-gaap_RealEstateOtherAdditions |  |  |  |
Tenant improvements | 4,240,293 us-gaap_RealEstateImprovements |  |  |  |
In-place leases | 2,415,501 netr_RealEstateInPlaceLeases |  |  |  |
Leasing costs | 1,779,430 netr_RealEstateLeasingCosts |  |  |  |
Total purchase price | 59,063,369 us-gaap_RealEstatePeriodIncreaseDecrease |  |  |  |
Bismarck Office [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Purchase price of property acquired |  | 5,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |
Cash payment for the properties acquired |  | 2,200,000 us-gaap_PaymentsToAcquireAssetsInvestingActivities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |
Promissory note issued for property acquired | 3,321,198 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember | 3,400,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  | 3,321,198 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember | 0 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
Rentable square feet |  | 93,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |
Occupancy rate |  | 85.00%netr_OccupancyRate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 413,000 netr_RealEstateAcquisitionsOfLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |  |
Buildings and other | 4,233,700 us-gaap_RealEstateOtherAdditions / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |  |
Tenant improvements | 474,400 us-gaap_RealEstateImprovements / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |  |
In-place leases | 164,300 netr_RealEstateInPlaceLeases / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |  |
Leasing costs | 64,600 netr_RealEstateLeasingCosts / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |  |
Total purchase price | 5,350,000 us-gaap_RealEstatePeriodIncreaseDecrease / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember |  |  |  |
Union Terrace [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Purchase price of property acquired |  |  | 9,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |
Cash payment for the properties acquired |  |  | 2,800,000 us-gaap_PaymentsToAcquireAssetsInvestingActivities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |
Promissory note issued for property acquired | 6,600,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  | 6,600,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember | 6,600,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember | 0 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
Rentable square feet |  |  | 84,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |
Occupancy rate |  |  | 82.00%netr_OccupancyRate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 1,717,000 netr_RealEstateAcquisitionsOfLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |  |  |
Buildings and other | 5,267,900 us-gaap_RealEstateOtherAdditions / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |  |  |
Tenant improvements | 1,643,300 us-gaap_RealEstateImprovements / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |  |  |
In-place leases | 370,100 netr_RealEstateInPlaceLeases / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |  |  |
Leasing costs | 426,700 netr_RealEstateLeasingCosts / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |  |  |
Total purchase price | 9,425,000 us-gaap_RealEstatePeriodIncreaseDecrease / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember |  |  |  |
Centennial Tech Center [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Purchase price of property acquired | 15,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  | 15,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |
Cash payment for the properties acquired |  |  |  | 5,200,000 us-gaap_PaymentsToAcquireAssetsInvestingActivities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |
Promissory note issued for property acquired | 10,250,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  | 10,250,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember | 0 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
Rentable square feet | 110,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  | 110,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |
Occupancy rate |  |  |  | 97.00%netr_OccupancyRate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 2,025,000 netr_RealEstateAcquisitionsOfLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  |  |
Buildings and other | 10,417,901 us-gaap_RealEstateOtherAdditions / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  |  |
Tenant improvements | 1,583,869 us-gaap_RealEstateImprovements / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  |  |
In-place leases | 762,875 netr_RealEstateInPlaceLeases / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  |  |
Leasing costs | 710,355 netr_RealEstateLeasingCosts / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  |  |
Total purchase price | 15,500,000 us-gaap_RealEstatePeriodIncreaseDecrease / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember |  |  |  |
Arapahoe Service Center [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Purchase price of property acquired | 11,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  | 11,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |
Cash payment for the properties acquired |  |  |  | 2,400,000 us-gaap_PaymentsToAcquireAssetsInvestingActivities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |
Promissory note issued for property acquired | 8,500,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  | 8,500,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember | 0 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
Termination Loans | 400,000 us-gaap_TerminationLoans / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  | 400,000 us-gaap_TerminationLoans / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |
Rentable square feet | 44,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  | 44,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |
Occupancy rate |  |  |  | 97.00%netr_OccupancyRate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 1,750,000 netr_RealEstateAcquisitionsOfLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  |  |
Buildings and other | 8,890,316 us-gaap_RealEstateOtherAdditions / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  |  |
Tenant improvements | 153,392 us-gaap_RealEstateImprovements / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  |  |
In-place leases | 124,974 netr_RealEstateInPlaceLeases / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  |  |
Leasing costs | 292,987 netr_RealEstateLeasingCosts / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  |  |
Total purchase price | 11,211,669 us-gaap_RealEstatePeriodIncreaseDecrease / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember |  |  |  |
Union Town Center [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Purchase price of property acquired | 11,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  | 11,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |
Cash payment for the properties acquired |  |  |  | 3,300,000 us-gaap_PaymentsToAcquireAssetsInvestingActivities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |
Promissory note issued for property acquired | 8,440,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  | 8,440,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember | 0 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
Rentable square feet | 79,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  | 79,000 us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |
Occupancy rate |  |  |  | 100.00%netr_OccupancyRate / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 1,420,000 netr_RealEstateAcquisitionsOfLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  |  |
Buildings and other | 8,766,628 us-gaap_RealEstateOtherAdditions / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  |  |
Tenant improvements | 385,332 us-gaap_RealEstateImprovements / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  |  |
In-place leases | 993,252 netr_RealEstateInPlaceLeases / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  |  |
Leasing costs | 284,788 netr_RealEstateLeasingCosts / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  |  |
Total purchase price | 11,850,000 us-gaap_RealEstatePeriodIncreaseDecrease / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember |  |  |  |
18 Model Home properties Pennsylvania and Arizona [Member] |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Purchase price of property acquired | 5,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  | 5,700,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |
Cash payment for the properties acquired |  |  |  | 2,300,000 us-gaap_PaymentsToAcquireAssetsInvestingActivities / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |
Promissory note issued for property acquired | 3,400,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  | 3,400,000 us-gaap_NotesPayable / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |
Number of Model Homes under lease contract |  |  |  | 18 netr_NumberOfModelHomesUnderLeaseContract / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |
Allocated Purchase Price of Properties Acquired [Abstract] |  |  |  |  |
Land | 1,023,830 netr_RealEstateAcquisitionsOfLand / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  |  |
Buildings and other | 4,702,870 us-gaap_RealEstateOtherAdditions / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  |  |
Tenant improvements | 0 us-gaap_RealEstateImprovements / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  |  |
In-place leases | 0 netr_RealEstateInPlaceLeases / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  |  |
Leasing costs | 0 netr_RealEstateLeasingCosts / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  |  |
Total purchase price | $ 5,726,700 us-gaap_RealEstatePeriodIncreaseDecrease / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ModelHomeInPennsylvaniaAndArizonaMember |  |  |  |

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- Definition Definite liabilities to third parties under a termination loan agreement, whether or not guaranteed in whole or in part by the government. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 405 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6471918&loc=d3e56288-109415 + Details
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