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Series B Mandatorily Redeemable Preferred Stock (Details) (USD $)
1 Months Ended
Aug. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Deferred financing costs   $ 1,748,000us-gaap_DeferredFinanceCostsNet $ 1,148,000us-gaap_DeferredFinanceCostsNet
Mandatorily Redeemable Preferred Stock [Member] | Series B Preferred Stock [Member]      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]      
Financial Instruments Subject to Mandatory Redemption, Captial Contributions 40,000,000netr_FinancialInstrumentsSubjectToMandatoryRedemptionCaptialContributions
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Preferred stock shares issued (in shares) 16,600us-gaap_PreferredStockSharesIssued
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Preferred stock, par or stated value (in dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Liquidation preference per share (in dollars per share) $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Financial Instruments Subject to Mandatory Redemption, Return On Funds Invested 14.00%netr_FinancialInstrumentsSubjectToMandatoryRedemptionReturnOnFundsInvested
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Financial Instruments Subject to Mandatory Redemption, Monthly Payout, Percent 10.00%netr_FinancialInstrumentsSubjectToMandatoryRedemptionMonthlyPayoutPercent
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Financial Instruments Subject to Mandatory Redemption, Monthly Percent Accrued 4.00%netr_FinancialInstrumentsSubjectToMandatoryRedemptionMonthlyPercentAccrued
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Deferred financing costs 2,700,000us-gaap_DeferredFinanceCostsNet
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
   
Interest expense $ 380,000us-gaap_InterestExpense
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember