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Real Estate Held For Sale and Discontinued Operations (Details) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |  |
Disposal Group, Including Discontinued Operation, Liabilities, Total | $ 17,096,794 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  | $ 17,423,479 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Discontinued operations before non-controlling interests | 30,304 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 65,682 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Sparkys Self-Storage Portfolio, Disposal Group [Member] |  |  |
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |  |
Disposal Group, Including Discontinued Operation, Real Estate Assets, Gross | 32,624,770 netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 32,637,520 netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Real Estate Assets, Accumulated Depreciation | (3,695,491)netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsAccumulatedDepreciation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | (3,529,845)netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsAccumulatedDepreciation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Real Estate Assets, Net | 28,929,279 netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 29,107,675 netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Other Assets | 969,197 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 895,831 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Assets, Total | 29,898,476 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 30,003,506 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Mortgage Notes Payable | 16,833,662 netr_DisposalGroupIncludingDiscontinuedOperationMortgageNotesPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 17,260,387 netr_DisposalGroupIncludingDiscontinuedOperationMortgageNotesPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Other Liabilities | 263,132 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 163,092 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Liabilities, Total | 17,096,794 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |  | 17,423,479 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] |  |  |
Disposal Group, Including Discontinued Operation, Rental Income | 789,483 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember | 783,707 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |
Disposal Group, Including Discontinued Operation, Other Income | 103,494 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember | 76,880 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |
Disposal Group, Including Discontinued Operation, Operating Expense | (480,960)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember | (406,757)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |
Disposal Group, Including Discontinued Operation, Depreciation | (165,646)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember | (167,269)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |
Disposal Group, Including Discontinued Operation, Interest Expense | (216,067)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember | (220,879)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |
Discontinued operations before non-controlling interests | $ 30,304 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember | $ 65,682 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember |

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- Definition Amount classified as mortgage notes payable attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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- Definition Amount classified as real estate depreciation attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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- Definition Amount classified as real estate assets gross attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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- Definition Amount classified as real estate assets net of accumulated depreciation attributable to disposal group held for sale or disposed of. + References No definition available. + Details
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Definition Amount of depreciation and amortization attributable to disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of interest expense allocated to disposal group, including a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section S99 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1063-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1060-107759 + Details
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- Definition Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount classified as other assets attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of other income attributable to disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount classified as other liabilities attributable to disposal group held for sale or disposed of. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of rental income attributable to the disposal group, including a component of the entity (discontinued operation). + References No definition available. + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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