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Recent Real Estate Transactions (Tables) | 12 Months Ended
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Dec. 31, 2015
Real Estate [Abstract] |
Properties Acquired and Sold | The Company allocated the purchase price of the properties acquired during 2015 as follows:
|  |  |  |  |  | Buildings |  |  | Tenant |  |  | Leases |  |  | Leasing |  |  | Total |
Property |  | Land |  |  | and Other |  |  | Improvements |  |  | in Place (1) |  |  | Costs |  |  | Purchase Price |
Shea Center II |  | $ | 2,213,734 |  |  | $ | 19,344,132 |  |  | $ | 2,336,066 |  |  | $ | 809,110 |  |  | $ | 621,958 |  |  | $ | 25,325,000 |
One Park Centre |  |  | 1,205,552 |  |  |  | 7,047,875 |  |  |  | 274,591 |  |  |  | 366,121 |  |  |  | 255,861 |  |  |  | 9,150,000 |
Highland Court |  |  | 3,608,028 |  |  |  | 6,939,286 |  |  |  | 1,412,097 |  |  |  | 621,323 |  |  |  | 469,266 |  |  |  | 13,050,000 |
Research Parkway |  |  | 407,722 |  |  |  | 2,283,689 |  |  |  | 38,022 |  |  |  | 50,300 |  |  |  | 70,267 |  |  |  | 2,850,000 |
300 N.P. |  |  | 135,430 |  |  |  | 3,429,097 |  |  |  | 53,272 |  |  |  | 127,852 |  |  |  | 104,349 |  |  |  | 3,850,000 |
West Fargo Industrial |  |  | 1,693,035 |  |  |  | 6,021,666 |  |  |  | 3,166 |  |  |  | 99,595 |  |  |  | 83,038 |  |  |  | 7,900,500 |
Model Homes Properties |  |  | 797,000 |  |  |  | 4,930,092 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,727,092 |
|  | $ | 10,060,501 |  |  | $ | 49,995,837 |  |  | $ | 4,117,214 |  |  | $ | 2,074,301 |  |  | $ | 1,604,739 |  |  | $ | 67,852,592 |

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- Definition Tabular disclosure of the properties acquired and sold during the period. + References No definition available. + Details
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Namespace Prefix: | netr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration