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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 9,793,814us-gaap_FiniteLivedIntangibleAssetsGross $ 5,411,279us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization (4,593,291)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (3,844,489)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Lease intangibles, net 5,200,523us-gaap_FiniteLivedIntangibleAssetsNet 1,566,790us-gaap_FiniteLivedIntangibleAssetsNet
FiniteLivedIntangibleAssetsNetAmortizationExpenseRollingMaturityAbstract    
2015 673,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths  
2016 314,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearTwo  
2017 169,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearThree  
2018 132,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFour  
2019 93,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRollingYearFive  
Thereafter 3,819,000us-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 4,255,565us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
2,015,459us-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 2,412,783us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeasesAcquiredInPlaceMember
521,651us-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
1,448,985us-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 2,013,448us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
449,541us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= netr_LeasingCostMember
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
Above Market Leases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Lease intangibles 1,977,113us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
1,614,114us-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 774,292us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember
$ 595,598us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_AboveMarketLeasesMember