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CREDIT FACILITY (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Line Of Credit Facility [Line Items]      
Revolving credit facility, initiation date (Date) Nov. 08, 2012    
Revolving credit facility, expiration date (Date) Nov. 08, 2015    
Revolving credit facility, borrowing capacity, maximum $ 40,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Revolving credit facility, amount outstanding 0us-gaap_LinesOfCreditCurrent   0us-gaap_LinesOfCreditCurrent
Amount above Federal Funds rate, used as base rate, if higher than prime and LIBOR plus 1.50% (in Percent) 0.50%ntri_AmountAboveFederalFundsRateInterestRateIfHigherThanPrimeAndLIBORPlusOneAndAHalfPercent    
Amount above one month LIBOR rate as determine three days prior, used as base rate, if higher than prime or federal funds rate plus 0.50% (in Percent) 1.50%ntri_AmountAboveLIBORRateUsedAsBaseRateIfHigherThanPrimeOrFederalFundsRatePlus50Percent    
Revolving credit facility, interest on borrowed funds 0us-gaap_InterestExpenseDebt 0us-gaap_InterestExpenseDebt  
Revolving credit facility, commitment fee, classified within interest (expense) income, net 37us-gaap_LineOfCreditFacilityCommitmentFeeAmount 33us-gaap_LineOfCreditFacilityCommitmentFeeAmount  
Revolving credit facility, unamortized debt issuance costs $ 71us-gaap_DeferredFinanceCostsNet    
Minimum [Member]      
Line Of Credit Facility [Line Items]      
Revolving credit facility, unused commitment fee annual percentage (in Percent) 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Line Of Credit Facility [Line Items]      
Revolving credit facility, unused commitment fee annual percentage (in Percent) 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Base Rate [Member] | Minimum [Member]      
Line Of Credit Facility [Line Items]      
Revolving credit facility, basis spread on variable rate (in Percent) 0.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
Base Rate [Member] | Maximum [Member]      
Line Of Credit Facility [Line Items]      
Revolving credit facility, basis spread on variable rate (in Percent) 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
   
London Interbank Offered Rate "LIBOR" [Member] | Minimum [Member]      
Line Of Credit Facility [Line Items]      
Revolving credit facility, basis spread on variable rate (in Percent) 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
London Interbank Offered Rate "LIBOR" [Member] | Maximum [Member]      
Line Of Credit Facility [Line Items]      
Revolving credit facility, basis spread on variable rate (in Percent) 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember