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Consolidated Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Real Estate Investment Property, Net [Abstract]    
Land $ 40,918,758us-gaap_Land $ 40,422,812us-gaap_Land
Buildings and improvements 130,364,206us-gaap_InvestmentBuildingAndBuildingImprovements 128,719,410us-gaap_InvestmentBuildingAndBuildingImprovements
Tenant improvements 15,398,595us-gaap_TenantImprovements 13,164,998us-gaap_TenantImprovements
Lease Intangibles 9,793,814netr_LeaseIntangibles 9,793,814netr_LeaseIntangibles
Real estate assets and lease intangibles, cost 196,475,373us-gaap_RealEstateInvestmentPropertyAtCost 192,101,034us-gaap_RealEstateInvestmentPropertyAtCost
Accumulated depreciation and amortization (24,788,566)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation (23,011,006)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Real estate assets and lease intangibles, net 171,686,807us-gaap_RealEstateInvestmentPropertyNet 169,090,028us-gaap_RealEstateInvestmentPropertyNet
Real estate assets held for sale, net 28,929,279us-gaap_RealEstateHeldforsale 29,107,675us-gaap_RealEstateHeldforsale
Cash and cash equivalents 4,475,600us-gaap_CashAndCashEquivalentsAtCarryingValue 5,636,002us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 5,113,154us-gaap_RestrictedCashAndCashEquivalents 4,086,498us-gaap_RestrictedCashAndCashEquivalents
Deferred leasing and finance costs, net 5,318,825netr_DeferredLeasingAndFinancingCosts 5,438,857netr_DeferredLeasingAndFinancingCosts
Goodwill 2,423,000us-gaap_Goodwill 2,423,000us-gaap_Goodwill
Other assets, net 5,194,696us-gaap_OtherAssets 4,842,878us-gaap_OtherAssets
TOTAL ASSETS 223,141,361us-gaap_Assets 220,624,938us-gaap_Assets
Liabilities:    
Mortgage notes payable 111,282,132us-gaap_NotesPayable [1] 106,475,819us-gaap_NotesPayable [1]
Liabilities related to Assets Held for Sale 17,096,794us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation 17,423,479us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation
Accounts payable and accrued liabilities 6,956,931us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent 6,631,804us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Dividends payable 1,006,534us-gaap_DividendsPayableCurrentAndNoncurrent 997,175us-gaap_DividendsPayableCurrentAndNoncurrent
Below Market Rent 934,280us-gaap_BelowMarketLeaseNet 960,328us-gaap_BelowMarketLeaseNet
Total liabilities 153,876,671us-gaap_Liabilities 149,088,605us-gaap_Liabilities
Commitments and contingencies      
Shareholders' equity:    
Additional paid-in capital 144,315,350us-gaap_AdditionalPaidInCapitalCommonStock 143,715,876us-gaap_AdditionalPaidInCapitalCommonStock
Dividends in excess of accumulated losses (86,817,227)us-gaap_RetainedEarningsAccumulatedDeficit (83,150,866)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity before noncontrolling interest 57,667,536us-gaap_StockholdersEquity 60,733,884us-gaap_StockholdersEquity
Noncontrolling interest 11,597,154us-gaap_MinorityInterest 10,802,449us-gaap_MinorityInterest
Total equity 69,264,690us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 71,536,333us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 223,141,361us-gaap_LiabilitiesAndStockholdersEquity 220,624,938us-gaap_LiabilitiesAndStockholdersEquity
Redeemable Convertible Preferred Stock Series B [Member]    
Liabilities:    
Mandatorily redeemable Series B Preferred Stock, $0.01 par value, $1,000 liquidating preference; shares authorized: 40,000; shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively 16,600,000us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent
/ us-gaap_StatementClassOfStockAxis
= netr_RedeemableConvertiblePreferredStockSeriesBMember		 16,600,000us-gaap_SharesSubjectToMandatoryRedemptionSettlementTermsAmountNoncurrent
/ us-gaap_StatementClassOfStockAxis
= netr_RedeemableConvertiblePreferredStockSeriesBMember
Common Class A [Member]    
Shareholders' equity:    
Common stock series A, $0.01 par value, shares authorized: 100,000,000; 16,941,250 and 16,887,377 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively $ 169,413us-gaap_CommonStockValueOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 168,874us-gaap_CommonStockValueOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
[1]
Each Model Home has a standalone mortgage note at interest rates ranging from 4.9% to 5.8% (at March 31, 2015).