XML 40 R50.htm IDEA: XBRL DOCUMENT v2.4.1.9

Schedule III (Real Estate and Accumulated Depreciation) (Details) (USD $)	Dec. 31, 2014
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 132,408,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	47,682,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	170,415,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	229,308,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	9,932,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	47,681,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	181,311,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
SEC Schedule III, Real Estate, Gross, Total	228,992,000us-gaap_RealEstateGrossAtCarryingValue
Real Estate Accumulated Depreciation	26,540,000us-gaap_RealEstateAccumulatedDepreciation
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	4,250,000us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
SEC Schedule III, Real Estate Investment Property, Net, Total	198,197,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
Industrial Office Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	83,258,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	28,774,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	106,090,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	134,863,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	8,512,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	28,774,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	114,665,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate, Gross, Total	143,437,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
Real Estate Accumulated Depreciation	18,026,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	3,950,000us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
SEC Schedule III, Real Estate Investment Property, Net, Total	121,461,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember
Industrial Office Properties [Member] | Havana Parker [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,500,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,023,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,806,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	5,829,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	2,454,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,023,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,260,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate, Gross, Total	8,282,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
Real Estate Accumulated Depreciation	2,564,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	3,450,000us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
SEC Schedule III, Real Estate Investment Property, Net, Total	2,268,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_HavanaParkerMember
Industrial Office Properties [Member] | Garden Gateway Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	6,964,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	3,035,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,091,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	15,126,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	1,240,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,035,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,331,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate, Gross, Total	16,365,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
Real Estate Accumulated Depreciation	4,245,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
SEC Schedule III, Real Estate Investment Property, Net, Total	12,120,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GardenGatewayPlazaMember
Industrial Office Properties [Member] | Executive Office Park [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	4,380,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,266,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,815,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	10,080,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	252,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,266,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,066,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate, Gross, Total	10,332,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
Real Estate Accumulated Depreciation	2,059,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
SEC Schedule III, Real Estate Investment Property, Net, Total	8,274,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ExecutiveOfficeParkMember
Industrial Office Properties [Member] | Pacific Oaks Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,599,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	980,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,868,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	4,848,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	124,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	980,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,993,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate, Gross, Total	4,973,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
Real Estate Accumulated Depreciation	682,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
SEC Schedule III, Real Estate Investment Property, Net, Total	4,291,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PacificOaksPlazaMember
Industrial Office Properties [Member] | Morena Office Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,352,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,333,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,203,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	6,536,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	688,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,333,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,891,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate, Gross, Total	7,224,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
Real Estate Accumulated Depreciation	1,263,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	500,000us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
SEC Schedule III, Real Estate Investment Property, Net, Total	5,461,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_MorenaOfficeCenterMember
Industrial Office Properties [Member] | Genesis Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	4,492,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,400,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,600,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	10,000,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	663,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,400,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,263,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate, Gross, Total	10,663,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
Real Estate Accumulated Depreciation	2,050,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
SEC Schedule III, Real Estate Investment Property, Net, Total	8,613,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_GenesisPlazaMember
Industrial Office Properties [Member] | Fargo Bank Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	10,993,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	832,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,743,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	9,575,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	1,971,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	832,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,714,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate, Gross, Total	11,546,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
Real Estate Accumulated Depreciation	1,519,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
SEC Schedule III, Real Estate Investment Property, Net, Total	10,027,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_FargoBankBuildingMember
Industrial Office Properties [Member] | Rangewood Medical Office Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,092,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	572,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,058,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	2,630,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	356,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	572,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,414,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate, Gross, Total	2,986,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
Real Estate Accumulated Depreciation	625,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
SEC Schedule III, Real Estate Investment Property, Net, Total	2,361,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RangewoodMedicalOfficeBuildingMember
Industrial Office Properties [Member] | Shoreline Medical Building [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	3,847,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,820,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,530,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	6,350,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,820,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,530,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate, Gross, Total	6,350,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
Real Estate Accumulated Depreciation	356,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
SEC Schedule III, Real Estate Investment Property, Net, Total	5,994,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ShorelineMedicalBuildingMember
Industrial Office Properties [Member] | Port of San Diego Complex [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	10,368,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	9,613,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,887,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	14,500,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	401,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,613,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,288,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate, Gross, Total	14,901,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
Real Estate Accumulated Depreciation	947,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
SEC Schedule III, Real Estate Investment Property, Net, Total	13,954,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PortOfSanDiegoComplexMember
Industrial Office Properties [Member] | The Presidio [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	6,000,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,325,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,950,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	7,275,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	276,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,325,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,226,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate, Gross, Total	7,551,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
Real Estate Accumulated Depreciation	867,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
SEC Schedule III, Real Estate Investment Property, Net, Total	6,684,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_PresidioMember
Industrial Office Properties [Member] | Bismarck Office [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	3,321,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	413,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,926,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	5,339,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	70,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	413,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,996,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate, Gross, Total	5,409,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
Real Estate Accumulated Depreciation	439,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
SEC Schedule III, Real Estate Investment Property, Net, Total	4,969,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_BismarckOfficeMember
Industrial Office Properties [Member] | Union Terrace [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	6,600,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,717,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,708,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	9,425,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	17,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,717,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,725,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate, Gross, Total	9,442,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
Real Estate Accumulated Depreciation	410,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
SEC Schedule III, Real Estate Investment Property, Net, Total	9,032,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTerraceMember
Industrial Office Properties [Member] | Centennial Tech Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	10,250,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	2,025,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,475,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	15,500,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,025,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,515,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate, Gross, Total	15,540,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
Real Estate Accumulated Depreciation	0us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
SEC Schedule III, Real Estate Investment Property, Net, Total	15,540,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_CentennialTechCenterMember
Industrial Office Properties [Member] | Arapahoe Service Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	8,500,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,420,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,430,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	11,850,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,420,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	10,453,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate, Gross, Total	11,873,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
Real Estate Accumulated Depreciation	0us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
SEC Schedule III, Real Estate Investment Property, Net, Total	11,873,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_IndustrialOfficePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_ArapahoeServiceCenterMember
Retail Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	16,005,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	9,420,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,052,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	36,472,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	1,160,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,420,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	29,106,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate, Gross, Total	38,528,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
Real Estate Accumulated Depreciation	4,189,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	300,000us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
SEC Schedule III, Real Estate Investment Property, Net, Total	34,037,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember
Retail Properties [Member] | World Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,698,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,232,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	7,930,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	627,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,698,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,858,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate, Gross, Total	8,557,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
Real Estate Accumulated Depreciation	1,723,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
SEC Schedule III, Real Estate Investment Property, Net, Total	6,834,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WorldPlazaMember
Retail Properties [Member] | Regatta Square [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,215,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	811,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,369,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	2,180,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	71,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	811,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,440,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate, Gross, Total	2,251,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
Real Estate Accumulated Depreciation	353,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
SEC Schedule III, Real Estate Investment Property, Net, Total	1,897,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_RegattaSquareMember
Retail Properties [Member] | Waterman Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	3,368,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	2,350,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,814,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	7,164,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	62,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,350,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,875,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate, Gross, Total	7,226,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
Real Estate Accumulated Depreciation	930,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	300,000us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
SEC Schedule III, Real Estate Investment Property, Net, Total	5,995,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_WatermanPlazaMember
Retail Properties [Member] | Yucca Valley Retail Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,982,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	2,811,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,175,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	7,986,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	400,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,811,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,323,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate, Gross, Total	9,134,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
Real Estate Accumulated Depreciation	1,183,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
SEC Schedule III, Real Estate Investment Property, Net, Total	7,951,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_YuccaValleyRetailCenterMember
Retail Properties [Member] | Union Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	8,440,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,750,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,462,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	11,212,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,750,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,610,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate, Gross, Total	11,360,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
Real Estate Accumulated Depreciation	0us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
SEC Schedule III, Real Estate Investment Property, Net, Total	11,360,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_RetailPropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_UnionTownCenterMember
Self Storage Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	17,002,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	7,258,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	25,451,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	32,709,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	260,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,258,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	25,712,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate, Gross, Total	32,971,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
Real Estate Accumulated Depreciation	3,863,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	0us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
SEC Schedule III, Real Estate Investment Property, Net, Total	29,107,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember
Self Storage Properties [Member] | Sparkys Palm Self Storage [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,400,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	784,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,242,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	5,026,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	17,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	784,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,260,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate, Gross, Total	5,044,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
Real Estate Accumulated Depreciation	778,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
SEC Schedule III, Real Estate Investment Property, Net, Total	4,266,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysPalmSelfStorageMember
Self Storage Properties [Member] | Sparky's Joshua Self-Storage [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	3,318,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,281,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,726,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	8,007,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	57,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,281,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	6,783,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate, Gross, Total	8,065,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
Real Estate Accumulated Depreciation	1,404,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
SEC Schedule III, Real Estate Investment Property, Net, Total	6,661,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysJoshuaSelfStorageMember
Self Storage Properties [Member] | Sparky's Thousand Palms Self-Storage [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	4,118,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	584,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,580,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	6,164,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	17,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	584,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,597,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate, Gross, Total	6,181,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
Real Estate Accumulated Depreciation	815,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
SEC Schedule III, Real Estate Investment Property, Net, Total	5,365,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysThousandPalmsSelfStorageMember
Self Storage Properties [Member] | Sparky's Hesperia East Self-Storage [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	834,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,227,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,305,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	2,532,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	31,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,227,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,336,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate, Gross, Total	2,563,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
Real Estate Accumulated Depreciation	187,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
SEC Schedule III, Real Estate Investment Property, Net, Total	2,376,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysHesperiaEastSelfStorageMember
Self Storage Properties [Member] | Sparky's Rialto Self-Storage [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,127,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,310,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,820,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	5,130,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	30,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,310,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,850,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate, Gross, Total	5,160,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
Real Estate Accumulated Depreciation	479,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
SEC Schedule III, Real Estate Investment Property, Net, Total	4,681,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysRialtoSelfStorageMember
Self Storage Properties [Member] | Sparky's Lancaster Self Storage 1 [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,914,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	949,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,701,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	3,650,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	76,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	949,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,777,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate, Gross, Total	3,726,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
Real Estate Accumulated Depreciation	110,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
SEC Schedule III, Real Estate Investment Property, Net, Total	3,616,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysLancasterSelfStorage1Member
Self Storage Properties [Member] | Sparky's Sunrise Self-Storage [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	2,291,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,123,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,077,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	2,200,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	32,000us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,123,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,109,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate, Gross, Total	2,232,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
Real Estate Accumulated Depreciation	90,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
SEC Schedule III, Real Estate Investment Property, Net, Total	2,142,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_SelfStoragePropertiesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_SparkysSunriseSelfStorageMember
Model Home [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	7,703,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	2,230,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,822,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	14,052,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,230,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,826,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate, Gross, Total	14,056,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
Real Estate Accumulated Depreciation	462,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	0us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
SEC Schedule III, Real Estate Investment Property, Net, Total	13,592,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember
Model Home [Member] | NetREIT Dubose Model Home REIT, Inc. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	5,171,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	1,451,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,188,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	9,639,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,451,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,188,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate, Gross, Total	9,639,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
Real Estate Accumulated Depreciation	366,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	0us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
SEC Schedule III, Real Estate Investment Property, Net, Total	9,272,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_NetreitDuboseModelHomeReitIncMember
Model Home [Member] | Dubose Model Home Investors 201 L.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,100,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	375,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,624,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	2,000,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	376,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	1,624,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate, Gross, Total	2,000,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
Real Estate Accumulated Depreciation	81,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	0us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
SEC Schedule III, Real Estate Investment Property, Net, Total	1,918,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors201LpMember
Model Home [Member] | Dubose Model Home Investors 202, L.P. [Member]
Real Estate And Accumulated Depreciation [Line Items]
SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances	1,432,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land	404,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,010,000us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements, Total	2,413,000us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land	403,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,014,000us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate, Gross, Total	2,417,000us-gaap_RealEstateGrossAtCarryingValue / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
Real Estate Accumulated Depreciation	15,000us-gaap_RealEstateAccumulatedDepreciation / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
Mortgage Loans on Real Estate, Write-down or Reserve, Amount	0us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember
SEC Schedule III, Real Estate Investment Property, Net, Total	$ 2,402,000us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = netr_ModelHomeMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = netr_DuboseModelHomeInvestors202LPMember

X

- Definition

Amount of reserve for write-down of a mortgage loan on 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 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 210.12-29.7)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of accumulated depreciation pertaining to real estate investments 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 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.FN4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAccumulatedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lien or mortgage outstanding on real estate investment properties 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 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount before accumulated depreciation of buildings and improvements for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest.

+ References

Reference 1: 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)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of land for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest.

+ References

Reference 1: 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)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of land and buildings and improvements made to real estate investments and capitalized after acquisition 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 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Initial cost of buildings and improvements for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest.

+ References

Reference 1: 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)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Initial cost of land for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest.

+ References

Reference 1: 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)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024



Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12



Reference 4: 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

+ Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, before accumulated depreciation, of real estate investments 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

Name:	us-gaap_RealEstateGrossAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of building and improvement costs capitalized since acquisition for entities with a substantial portion of business acquiring and holding investment real estate. Excludes real estate not held as an investment or interest.

+ References

No definition available.

+ Details

Name:	us-gaap_SECScheduleIIIRealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionBuildingsAndImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after accumulated depreciation of real estate held for investment for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

No definition available.

+ Details

Name:	us-gaap_SECScheduleIIIRealEstateInvestmentPropertyNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=netr_IndustrialOfficePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=netr_ModelHomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=netr_RetailPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=netr_SelfStoragePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: