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Commitment and Contingencies (World Plaza Lease) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012
Ground Leases Disclosures [Abstract]
LeaseExpirationDate1	Jun. 01, 2062
Annual Lease payment	$ 21,910
Consumer Price Index ("CPI")	107.40%
Date of CPI	Jun. 01, 1963

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- Definition

World Plaza Annual lease payment

+ References

No definition available.

+ Details

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Namespace Prefix:	netr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The consumer price index at date of acquisition

+ References

No definition available.

+ Details

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Namespace Prefix:	netr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Date at which CPI was measured for the lease

+ References

No definition available.

+ Details

Name:	netr_DateOfCpi
Namespace Prefix:	netr_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration