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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	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