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Series B Mandatorily Redeemable Preferred Stock (Details) (Mandatorily Redeemable Preferred Stock [Member], Series B Preferred Stock [Member], USD $)
1 Months Ended 3 Months Ended
Aug. 31, 2014
Mar. 31, 2015
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   $ 290,000us-gaap_InterestExpense
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= us-gaap_MandatorilyRedeemablePreferredStockMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember