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Segment Reporting, Other Significant items (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	$ 1,029,816	$ 1,212,196
Acquisition of operating properties	31,888,295	37,780,414
Total real estate investments	32,918,111	38,992,610
Industrial Office Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	850,847	1,070,498
Acquisition of operating properties	13,625,000	24,075,000
Residential Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Acquisition of operating properties	17,138,295	5,971,980
Retail Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	158,005	119,746
Acquisition of operating properties	1,125,000	6,767,700
Self Storage Properties [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures and tenant improvements	20,964	21,952
Acquisition of operating properties	$ 0	$ 2,615,000

X

- Definition

The total of additions to real estate and lease intangibles

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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X

- Details

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