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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended
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Nov. 14, 2014 Property
Properties in Colorado Springs, Colorado [Member] |
Acquisition of Real Estate [Abstract] |
Number of properties acquired (in properties) | 2
Retail Center in Colorado Springs, Colorado [Member] |
Acquisition of Real Estate [Abstract] |
Purchase price of property acquired | $ 11.3
Rentable square feet | 44,000
Office Building in Colorado Springs, Colorado [Member] |
Acquisition of Real Estate [Abstract] |
Purchase price of property acquired | $ 15.5
Rentable square feet | 110,000

X
- Definition The number of units in a real estate property acquired during the period. + References No definition available. + Details
Name: | netr_NumberOfUnitsAcquiredInRealEstateProperty
Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_PaymentsToAcquireRealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of all consideration given or received by the Entity in the significant acquisition or disposal. + References No definition available. + Details
Name: | us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant