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Recent Real Estate Transactions (Tables) | 6 Months Ended
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Jun. 30, 2016
Real Estate [Abstract] |
Properties Acquired and Sold | The Company allocated the purchase price of the properties acquired during the three months ended June 30, 2016 as follows:
|  |  |  |  |  | Buildings |  |  | Total |
|  | Land |  |  | and Other |  |  | Purchase Price |
Model Homes Properties |  | $ | 934,000 |  |  | $ | 6,835,000 |  |  | $ | 7,769,000 |
|  | $ | 934,000 |  |  | $ | 6,835,000 |  |  | $ | 7,769,000 |

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- Definition Tabular disclosure of the properties acquired and sold during the period. + References No definition available. + Details
Name: | netr_PropertiesAcquiredAndSoldTableTextBlock
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