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Segment Reporting, Other Significant items (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	$ 347,496	$ 497,880
Acquisition of operating properties	1,139,715	375,760
Total real estate investments	1,487,211	873,640
Industrial Office Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	336,821	357,971
Residential Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	8,775	0
Acquisition of operating properties	1,139,715	375,760
Retail Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	0	134,121
Self Storage Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	$ 1,900	$ 5,788

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

- 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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: 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=6943989&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentReportingOtherSignificantReconcilingItemLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration