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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	$ 3,756,740us-gaap_PaymentsToAcquireRealEstate	[1]	$ 1,781,300us-gaap_PaymentsToAcquireRealEstate	[1]
Capital expenditures and tenant improvements	1,166,437us-gaap_PaymentsForTenantImprovements	[1]	906,493us-gaap_PaymentsForTenantImprovements	[1]
Total real estate investments	4,923,177netr_RealEstateAcquisitions	[1]	2,687,793netr_RealEstateAcquisitions	[1]
Industrial Office Properties [Member]
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]
Capital expenditures and tenant improvements	1,118,854us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember	[1]	678,304us-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	3,756,740us-gaap_PaymentsToAcquireRealEstate / us-gaap_StatementBusinessSegmentsAxis = us-gaap_ResidentialRealEstateMember	[1]	1,781,300us-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	41,333us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = us-gaap_RetailSiteMember	[1]	194,781us-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	$ 6,250us-gaap_PaymentsForTenantImprovements / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember	[1]	$ 33,408us-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

X

- 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

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=netr_SelfStoragePropertiesMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- 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: