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COMMITMENTS AND CONTINGENCIES (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
COMMITMENTS AND CONTINGENCIES    
Rent expense $ 661,000us-gaap_LeaseAndRentalExpense $ 687,000us-gaap_LeaseAndRentalExpense
Operating Leases    
2015 444,799us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent  
2016 299,207us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears  
2017 249,344us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears  
2018 249,344us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears  
2019 248,786us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears  
Maximum    
Commitment and contingencies    
Professional outplacement services that would be received by the participants 10,000nsys_ProfessionalOutplacementServicesWouldBeReceivedAmount
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2002 Plan    
Commitment and contingencies    
Period of graded vesting schedule 5 years  
Annual vesting by the participants (as a percent) 20.00%nsys_AnnualVestingPercentage
/ us-gaap_OtherCommitmentsAxis
= nsys_ExecutiveBonusLifeInsurancePlan2002Member
 
Expenses incurred $ 282,000us-gaap_OtherLaborRelatedExpenses
/ us-gaap_OtherCommitmentsAxis
= nsys_ExecutiveBonusLifeInsurancePlan2002Member
$ 333,000us-gaap_OtherLaborRelatedExpenses
/ us-gaap_OtherCommitmentsAxis
= nsys_ExecutiveBonusLifeInsurancePlan2002Member
2002 Plan | Officer participants    
Commitment and contingencies    
Bonus to be paid as a percentage of the participants base annual salary 15.00%nsys_BonusToBePaidAsPercentageOfParticipantsBaseAnnualSalary
/ us-gaap_OtherCommitmentsAxis
= nsys_ExecutiveBonusLifeInsurancePlan2002Member
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
 
2002 Plan | Other participants    
Commitment and contingencies    
Bonus to be paid as a percentage of the participants base annual salary 10.00%nsys_BonusToBePaidAsPercentageOfParticipantsBaseAnnualSalary
/ us-gaap_OtherCommitmentsAxis
= nsys_ExecutiveBonusLifeInsurancePlan2002Member
/ us-gaap_TitleOfIndividualAxis
= nsys_OtherParticipantsMember
 
Agreement(s) | Officer participants    
Commitment and contingencies    
Period of continued participation in health, disability and life insurance plans after involuntary termination 3 years  
Agreement(s) | Other participants    
Commitment and contingencies    
Period of continued participation in health, disability and life insurance plans after involuntary termination 2 years