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Segments (Capital Expenditures) (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |  |  |
Acquisition of operating properties | $ 3,756,740 us-gaap_PaymentsToAcquireRealEstate | [1] | $ 1,781,300 us-gaap_PaymentsToAcquireRealEstate | [1]
Capital expenditures and tenant improvements | 1,166,437 us-gaap_PaymentsForTenantImprovements | [1] | 906,493 us-gaap_PaymentsForTenantImprovements | [1]
Total real estate investments | 4,923,177 netr_RealEstateAcquisitions | [1] | 2,687,793 netr_RealEstateAcquisitions | [1]
Industrial Office Properties [Member] |  |  |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |  |  |
Capital expenditures and tenant improvements | 1,118,854 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | [1] | 678,304 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | [1]
Residential Properties [Member] |  |  |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |  |  |
Acquisition of operating properties | 3,756,740 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | [1] | 1,781,300 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember | [1]
Retail Properties [Member] |  |  |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |  |  |
Capital expenditures and tenant improvements | 41,333 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RetailSiteMember | [1] | 194,781 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RetailSiteMember | [1]
Self Storage Properties [Member] |  |  |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |  |  |
Capital expenditures and tenant improvements | $ 6,250 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | [1] | $ 33,408 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | [1]
[1] | Total consolidated capital expenditures are equal to the same amounts disclosed for total reportable segments.

X
- Definition The total of additions to real estate and lease intangibles + References No definition available. + Details
Name: | netr_RealEstateAcquisitions
Namespace Prefix: | netr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | netr_ReconciliationOfOtherSignificantReconcilingItemsFromSegmentsToConsolidatedAbstract
Namespace Prefix: | netr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash outflow for the allowance granted to lessee and/or direct costs incurred by lessor used to prepare the leased premises for tenant's occupancy. + References No definition available. + Details
Name: | us-gaap_PaymentsForTenantImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=netr_IndustrialOfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=netr_SelfStoragePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_RetailSiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |