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Real Estate Transactions (Disposals of Properties) (Details) (Residential Properties [Member], USD $) | 3 Months Ended
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Mar. 31, 2015 Properties
Real Estate Properties [Line Items] |
Number of properties | 64 us-gaap_NumberOfRealEstateProperties
Two Dubos Model Homes [Member] |
Real Estate Properties [Line Items] |
Number of properties | 2 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember
Proceeds from sale of property | $ 615,000 us-gaap_ProceedsFromSaleOfRealEstate / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember
Mortgage notes payable retired | 280,000 us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember
Allocated Purchase Price of Properties Sold [Abstract] |
Land | 69,000 netr_RealEstateCostOfLandSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember
Buildings and other | 454,000 netr_RealEstateBuildingsAndOther / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember
Total cost | 523,000 us-gaap_RealEstateCostOfRealEstateSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember
Gain (loss) on sale of property | $ 78,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_TwoDubosModelHomesMember

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- Details
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- Definition The carrying amount of buildings and other held as real estate investments that was sold during the period. + References No definition available. + Details
Name: | netr_RealEstateBuildingsAndOther
Namespace Prefix: | netr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The carrying amount of land held as real estate investments that was sold during the period. + References No definition available. + Details
Name: | netr_RealEstateCostOfLandSold
Namespace Prefix: | netr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The carrying amount of mortgage loans on real estate that were sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of real estate investments sold for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Details
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