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Segments (Net Operating Income by Segment) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Net Operating Income [Abstract] |  |
Rental income | $ 19,902,410 us-gaap_Revenues | $ 19,563,122 us-gaap_Revenues
Property and related expenses | (7,465,658)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment | (6,382,425)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment
Asset impairment | (950,000)us-gaap_AssetImpairmentCharges | (2,000,000)us-gaap_AssetImpairmentCharges
General and administrative expenses | (5,555,449)us-gaap_GeneralAndAdministrativeExpense | (5,443,652)us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization | (6,049,385)us-gaap_DepreciationDepletionAndAmortization | (5,309,560)us-gaap_DepreciationDepletionAndAmortization
Interest expense debt | (6,478,976)us-gaap_InterestExpenseDebt | (5,059,912)us-gaap_InterestExpenseDebt
Interest income | 85,806 us-gaap_InterestIncomeOperating | 116,602 us-gaap_InterestIncomeOperating
Gain on sales of real estate and partnerships, net | 5,120,699 us-gaap_GainLossOnSaleOfBusiness | 1,992,754 us-gaap_GainLossOnSaleOfBusiness
Loss from continuing operations | (853,601)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (2,523,071)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Significant Reconciling Items [Member] |  |
Net Operating Income [Abstract] |  |
Net operating income, as defined | 11,486,948 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 11,180,697 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
General and administrative expenses | (5,555,449)us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (5,443,652)us-gaap_GeneralAndAdministrativeExpense / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Depreciation and amortization | (6,049,385)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (5,309,560)us-gaap_DepreciationDepletionAndAmortization / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Interest expense debt | (6,478,976)us-gaap_InterestExpenseDebt / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (5,059,912)us-gaap_InterestExpenseDebt / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Interest income | 85,806 us-gaap_InterestIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 116,602 us-gaap_InterestIncomeOperating / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Gain on sales of real estate and partnerships, net | 5,120,699 us-gaap_GainLossOnSaleOfBusiness / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 1,992,754 us-gaap_GainLossOnSaleOfBusiness / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Gain on extinguishment of debt | 536,952 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_ExtinguishmentOfDebtGainLossNetOfTax / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Loss from continuing operations | (853,601)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (2,523,071)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Industrial Office Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 11,800,819 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | 10,448,256 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Property and related expenses | (4,769,364)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | (3,629,413)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Asset impairment | (950,000)us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | (2,000,000)us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Net operating income, as defined | 6,081,455 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember | 4,818,843 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Residential Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 2,065,327 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | 2,995,612 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Property and related expenses | (102,082)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | (195,752)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Net operating income, as defined | 1,963,245 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember | 2,799,860 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Retail Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 2,607,744 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | 2,878,145 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Property and related expenses | (877,620)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | (861,327)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Net operating income, as defined | 1,730,124 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember | 2,016,818 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Self Storage Properties [Member] |  |
Net Operating Income [Abstract] |  |
Rental income | 3,428,503 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | 3,241,109 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember
Property and related expenses | (1,716,379)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | (1,695,933)us-gaap_DirectCostsOfLeasedAndRentedPropertyOrEquipment / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember
Net operating income, as defined | $ 1,712,124 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember | $ 1,545,176 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember

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