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Real Estate Held For Sale and Discontinued Operations (Details) (USD $)	3 Months Ended
	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	$ 17,096,794us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation		$ 17,423,479us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Discontinued operations before non-controlling interests	30,304us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax	65,682us-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	32,624,770netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsGross / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		32,637,520netr_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	28,929,279netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		29,107,675netr_DisposalGroupIncludingDiscontinuedOperationRealEstateAssetsNet / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Other Assets	969,197us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		895,831us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Assets, Total	29,898,476us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		30,003,506us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Mortgage Notes Payable	16,833,662netr_DisposalGroupIncludingDiscontinuedOperationMortgageNotesPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		17,260,387netr_DisposalGroupIncludingDiscontinuedOperationMortgageNotesPayable / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Other Liabilities	263,132us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		163,092us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherLiabilities / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Liabilities, Total	17,096,794us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember		17,423,479us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Rental Income	789,483us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember	783,707us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember
Disposal Group, Including Discontinued Operation, Other Income	103,494us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherIncome / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember	76,880us-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	$ 30,304us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember	$ 65,682us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = netr_SparkysSelfStoragePortfolioDisposalGroupMember

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Amount classified as mortgage notes payable attributable to disposal group held for sale or disposed of.

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Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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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.

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