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Segments (Capital Expenditures) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |
Acquisition of operating properties | $ 59,275,783 us-gaap_PaymentsToAcquireRealEstate | $ 7,839,389 us-gaap_PaymentsToAcquireRealEstate
Capital expenditures and tenant improvements | 2,567,027 us-gaap_PaymentsForTenantImprovements | 2,857,010 us-gaap_PaymentsForTenantImprovements
Total real estate investments | 61,842,810 netr_RealEstateAcquisitions | 10,696,399 netr_RealEstateAcquisitions
Industrial Office Properties [Member] |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |
Acquisition of operating properties | 42,337,414 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | 0 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Capital expenditures and tenant improvements | 2,123,438 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | 2,758,787 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Residential Properties [Member] |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |
Acquisition of operating properties | 5,726,700 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | 4,189,389 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Retail Properties [Member] |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |
Acquisition of operating properties | 11,211,669 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | 3,650,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Capital expenditures and tenant improvements | 359,473 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | 70,235 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Self Storage Properties [Member] |  |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract] |  |
Capital expenditures and tenant improvements | $ 84,116 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | $ 27,988 us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember

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- 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

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- 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

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- 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: |

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

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

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