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Lease Intangibles (Net Value of Other Intangible Assets and Amortization by Class) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Lease intangibles | 9,793,814 us-gaap_FiniteLivedIntangibleAssetsGross | $ 5,411,279 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization | (4,593,291)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (3,844,489)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Lease intangibles, net | 5,200,523 us-gaap_FiniteLivedIntangibleAssetsNet | 1,566,790 us-gaap_FiniteLivedIntangibleAssetsNet
FiniteLivedIntangibleAssetsNetAmortizationExpenseRollingMaturityAbstract |  |
2015 | 673,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths |
2016 | 314,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo |
2017 | 169,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree |
2018 | 132,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour |
2019 | 93,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive |
Thereafter | 3,819,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive |
Weighted average [Member] |  |
FiniteLivedIntangibleAssetsNetAmortizationExpenseRollingMaturityAbstract |  |
Finite-Lived Intangible Assets, Remaining Amortization Period | 5 years 6 months |
Leases, Acquired-in-Place [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Lease intangibles | 4,255,565 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | 2,015,459 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Accumulated amortization | (1,842,782)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | (1,493,808)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Lease intangibles, net | 2,412,783 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember | 521,651 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LeasesAcquiredInPlaceMember
Leasing Cost [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Lease intangibles | 3,228,415 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = netr_LeasingCostMember | 1,448,985 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = netr_LeasingCostMember
Accumulated amortization | (1,214,967)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = netr_LeasingCostMember | (999,444)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = netr_LeasingCostMember
Lease intangibles, net | 2,013,448 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = netr_LeasingCostMember | 449,541 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = netr_LeasingCostMember
Tenant Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Lease intangibles | 332,721 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 332,721 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Accumulated amortization | (332,721)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (332,721)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Lease intangibles, net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Above Market Leases [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Lease intangibles | 1,977,113 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember | 1,614,114 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
Accumulated amortization | (1,202,821)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember | (1,018,516)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
Lease intangibles, net | 774,292 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember | $ 595,598 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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