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Commitment and Contingencies (World Plaza Lease) (Details) (USD $) | 12 Months Ended
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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
Name: | netr_AnnualLeasePayment
Namespace Prefix: | netr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The consumer price index at date of acquisition + References No definition available. + Details
Name: | netr_ConsumerPriceIndex
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

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

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- 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