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Real Estate Assets and Leases Intangibles (Purchase price of the properties acquired or sold) (Details) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Real Estate Properties [Line Items] |  |
Land | $ 37,075,489 | $ 34,330,356
Buildings and other | 117,245,115 | 102,090,547
Tenant Improvements | 6,025,708 | 5,547,091
Sub-total | 164,434,813 | 145,837,495
Model Home Properties Disposed [Member] |  |
Real Estate Properties [Line Items] |  |
Land | 892,563 | 1,094,267
Buildings and other | 6,100,079 | 7,331,915
Sub-total | 6,992,642 | 8,426,182
Rite Aid [Member] |  |
Real Estate Properties [Line Items] |  |
Land | 366,000 |
Buildings and other | 759,000 |
In Place Leases | 0 |
Leasing costs | 0 |
Sub-total | 1,125,000 |
Shoreline Medical Building [Member] |  |
Real Estate Properties [Line Items] |  |
Land | 1,820,000 |
Buildings and other | 4,311,000 |
In Place Leases | 83,000 |
Leasing costs | 136,000 |
Sub-total | 6,350,000 |
Model Home [Member] |  |
Real Estate Properties [Line Items] |  |
Land | 1,146,525 | 2,012,217
Buildings and other | 12,430,993 | 9,633,813
Tenant Improvements |  | 0
In Place Leases | 0 | 0
Leasing costs | 0 | 0
Above And Below Market Leases |  | 0
Sub-total | 13,577,518 | 11,646,030
Dakota Bank Buildings [Member] |  |
Real Estate Properties [Line Items] |  |
Land |  | 832,000
Buildings and other |  | 8,123,461
Tenant Improvements |  | 0
In Place Leases |  | 131,982
Leasing costs |  | 45,186
Above And Below Market Leases |  | 442,371
Sub-total |  | 9,575,000
Yucca Valley Retail Center [Member] |  |
Real Estate Properties [Line Items] |  |
Land |  | 2,445,331
Buildings and other |  | 3,549,162
Tenant Improvements |  | 520,485
In Place Leases |  | 819,979
Leasing costs |  | 0
Above And Below Market Leases |  | (567,257)
Sub-total |  | 6,767,700
Sparky's Sunrise Self-Storage [Member] |  |
Real Estate Properties [Line Items] |  |
Land |  | 1,123,000
Buildings and other |  | 1,077,000
Tenant Improvements |  | 0
In Place Leases |  | 0
Leasing costs |  | 0
Above And Below Market Leases |  | 0
Sub-total |  | 2,200,000
Port of San Diego Complex [Member] |  |
Real Estate Properties [Line Items] |  |
Land |  | 9,613,000
Buildings and other |  | 4,078,816
Tenant Improvements |  | 141,373
In Place Leases |  | 29,470
Leasing costs |  | 128,448
Above And Below Market Leases |  | 508,893
Sub-total |  | $ 14,500,000

X
- Definition Intangible assets related to acquisitions where tenant leases are at other than market value rent. + References No definition available. + Details
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Namespace Prefix: | netr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -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 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 + Details
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- Definition This element represents the amount of value allocated by a lessor (acquirer) to lease agreements which exist at acquisition of a leased property. Such amount may include the value assigned to existing tenant relationships and excludes the market adjustment component of the value assigned for above or below-market leases acquired. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Details
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Period Type: | duration

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- Definition Carrying amount of income producing properties held for rental. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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