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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:    
Net Income (Loss) $ (853,601)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ (2,523,071)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 6,049,385netr_DepreciationAmortizationAndAmortizationOfAboveMarketRents 5,309,560netr_DepreciationAmortizationAndAmortizationOfAboveMarketRents
Stock compensation 455,819us-gaap_RestrictedStockExpense 481,930us-gaap_RestrictedStockExpense
Bad debt expense 122,121us-gaap_ValuationAllowancesAndReservesDeductions 104,555us-gaap_ValuationAllowancesAndReservesDeductions
Real Estate Asset impairments 950,000us-gaap_AssetImpairmentCharges 2,000,000us-gaap_AssetImpairmentCharges
Gain on sales of real estate and partnerships, net (5,120,699)us-gaap_GainLossOnSaleOfBusiness (1,992,754)us-gaap_GainLossOnSaleOfBusiness
Gain on extinguishment of debt (536,952)us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Amortization Expense Of Financing Costs 417,724us-gaap_AmortizationOfFinancingCosts 191,852us-gaap_AmortizationOfFinancingCosts
Changes in operating assets and liabilities:    
Other assets 674,338us-gaap_IncreaseDecreaseInOtherOperatingAssets (257,338)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued liabilities 2,046,684us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 791,618us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Below Market Rent 184,366us-gaap_BelowMarketLeasePeriodIncreaseDecrease 28,048us-gaap_BelowMarketLeasePeriodIncreaseDecrease
Net cash provided by operating activities 4,389,185us-gaap_NetCashProvidedByUsedInOperatingActivities 4,134,400us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Real estate acquisitions (59,275,783)us-gaap_PaymentsToAcquireRealEstate (7,839,389)us-gaap_PaymentsToAcquireRealEstate
Building and tenant improvements (2,567,027)us-gaap_PaymentsForTenantImprovements (2,857,010)us-gaap_PaymentsForTenantImprovements
Deferred leasing costs (407,261)us-gaap_PaymentsForLeasingCosts (754,674)us-gaap_PaymentsForLeasingCosts
Proceeds received sale of real estate assets 22,287,463us-gaap_ProceedsFromSaleOfProductiveAssets 11,535,936us-gaap_ProceedsFromSaleOfProductiveAssets
Increase (Decrease) in Restricted Cash (2,731,221)us-gaap_IncreaseDecreaseInRestrictedCash (242,154)us-gaap_IncreaseDecreaseInRestrictedCash
Net cash used in investing activities (42,693,829)us-gaap_NetCashProvidedByUsedInInvestingActivities (157,291)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Proceeds from mortgage notes payable, net of issuance costs 56,859,919us-gaap_ProceedsFromNotesPayable 24,211,432us-gaap_ProceedsFromNotesPayable
Repayment of mortgage notes payable (22,811,129)us-gaap_RepaymentsOfNotesPayable (27,492,272)us-gaap_RepaymentsOfNotesPayable
Proceeds from issuance of mandatorily preferred stock, net 13,862,103netr_ProceedsFromIssuanceOfMandatorilyPreferredStock 0netr_ProceedsFromIssuanceOfMandatorilyPreferredStock
Repurchase of common stock (212,212)us-gaap_PaymentsForRepurchaseOfCommonStock (34,172)us-gaap_PaymentsForRepurchaseOfCommonStock
Redemption of Series 6.3% preferred stock (1,649,266)us-gaap_PaymentsForRepurchaseOfRedeemableConvertiblePreferredStock 0us-gaap_PaymentsForRepurchaseOfRedeemableConvertiblePreferredStock
Contributions received from noncontrolling interests net of distributions paid (7,512,262)us-gaap_ProceedsFromPaymentsToMinorityShareholders 3,563,920us-gaap_ProceedsFromPaymentsToMinorityShareholders
Dividends paid (4,803,508)us-gaap_PaymentsOfDividendsCommonStock (4,765,552)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities 33,733,645us-gaap_NetCashProvidedByUsedInFinancingActivities (4,516,644)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net (decrease) increase in cash and cash equivalents (4,570,999)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (539,535)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents:    
Beginning of year 10,207,001us-gaap_CashAndCashEquivalentsAtCarryingValue 10,746,536us-gaap_CashAndCashEquivalentsAtCarryingValue
Ending of year 5,636,002us-gaap_CashAndCashEquivalentsAtCarryingValue 10,207,001us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Interest paid 6,477,096us-gaap_InterestPaid 4,805,628us-gaap_InterestPaid
Non-cash financing activities:    
Reinvestment of cash dividend 3,314,477us-gaap_StockIssued1 3,981,651us-gaap_StockIssued1
Accrual of dividends payable 997,175netr_AccrualOfDividendsPayable 1,229,328netr_AccrualOfDividendsPayable
Conversion of partnership interests into common stock 165,018us-gaap_PartnersCapitalAccountExchangesAndConversions 333,269us-gaap_PartnersCapitalAccountExchangesAndConversions
CHG Management [Member]    
Non-cash financing activities:    
Stock issued for purchase of CHG Properties $ 0netr_NoncashAcquisitionStockIssuedValue
/ us-gaap_BusinessAcquisitionAxis
= netr_ChgManagementMember		 $ 1,900,000netr_NoncashAcquisitionStockIssuedValue
/ us-gaap_BusinessAcquisitionAxis
= netr_ChgManagementMember