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Share-Based Incentive Plan (Details) (Restricted Stock Plan [Member], Restricted Stock [Member], USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2006
Share-Based Incentive Plan [Abstract]      
Value of granted nonvested restricted stock issued $ 876,000us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings $ 656,000us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings  
Compensation expense $ 456,000us-gaap_AllocatedShareBasedCompensationExpense $ 482,000us-gaap_AllocatedShareBasedCompensationExpense  
Nonvested Restricted Shares [Roll Forward]      
Balance, beginning of period (in shares) 80,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber    
Granted (in shares) 81,604us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod    
Vested (in shares) (51,115)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod    
Cancelled (in shares) (9,094)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod    
Balance, end of period (in shares) 101,890us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 80,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber  
Private Placement [Member]
     
Share-Based Incentive Plan [Abstract]      
Offering price (in dollars per share) $ 10netr_OfferingPrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= netr_RestrictedStockPlanMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
  $ 8.6netr_OfferingPrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= netr_RestrictedStockPlanMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
Minimum [Member]
     
Share-Based Incentive Plan [Abstract]      
Vesting period 3 years    
Maximum [Member]
     
Share-Based Incentive Plan [Abstract]      
Vesting period 5 years