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Lease Intangibles (Net Value of Other Intangible Assets and Amortization by Class) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
May 15, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]      
Lease intangibles   $ 9,793,814us-gaap_FiniteLivedIntangibleAssetsGross $ 9,793,814us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization   (4,969,153)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (4,593,291)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Lease intangibles, net   4,824,661us-gaap_FiniteLivedIntangibleAssetsNet 5,200,523us-gaap_FiniteLivedIntangibleAssetsNet
FiniteLivedIntangibleAssetsNetAmortizationExpenseRollingMaturityAbstract      
2015   934,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths  
2016   853,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo  
2017   853,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree  
2018   688,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour  
2019   485,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive  
Thereafter   1,865,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingAfterYearFive  
Weighted average [Member]      
FiniteLivedIntangibleAssetsNetAmortizationExpenseRollingMaturityAbstract      
Finite-Lived Intangible Assets, Remaining Amortization Period 5 years 10 months 24 days    
Leases, Acquired-in-Place [Member]      
Finite-Lived Intangible Assets [Line Items]      
Lease intangibles   4,255,565us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
4,255,565us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Accumulated amortization   (2,038,772)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
(1,842,782)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Lease intangibles, net   2,216,793us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
2,412,783us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
Leasing Cost [Member]      
Finite-Lived Intangible Assets [Line Items]      
Lease intangibles   3,228,415us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
3,228,415us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
Accumulated amortization   (1,335,466)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
(1,214,967)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
Lease intangibles, net   1,892,949us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
2,013,448us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
Above Market Leases [Member]      
Finite-Lived Intangible Assets [Line Items]      
Lease intangibles   1,977,113us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
1,977,113us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Accumulated amortization   (1,262,194)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
(1,202,821)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Lease intangibles, net   714,919us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
774,292us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
Tenant Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Lease intangibles   332,721us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
332,721us-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   $ 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
$ 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember