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CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
General Electric      
Major customers and concentration of credit risk      
Number of divisions 2nsys_ConcentrationRiskNumberOfDivisions
/ us-gaap_MajorCustomersAxis
= nsys_LargestCustomerMember
2nsys_ConcentrationRiskNumberOfDivisions
/ us-gaap_MajorCustomersAxis
= nsys_LargestCustomerMember
 
Credit concentration risk      
Major customers and concentration of credit risk      
Excess cash balance, number of high credit quality financial institution 2nsys_ExcessCashBalancesNumberOfHighCreditQualityFinancialInstitution
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
   
Net sales | Customer concentration risk      
Major customers and concentration of credit risk      
Percentage of export sales to consolidated net sales 7.00%nsys_PercentageOfExportSalesToConsolidatedSales
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
13.00%nsys_PercentageOfExportSalesToConsolidatedSales
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
 
Net sales | Customer concentration risk | General Electric      
Major customers and concentration of credit risk      
Percentage of concentration risk (as a percent) 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_LargestCustomerMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_LargestCustomerMember
 
Net sales | Customer concentration risk | GE Healthcare      
Major customers and concentration of credit risk      
Percentage of concentration risk (as a percent) 17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionOneOfLargestCustomerMember
24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionOneOfLargestCustomerMember
 
Net sales | Customer concentration risk | GE Transportation      
Major customers and concentration of credit risk      
Percentage of concentration risk (as a percent) 9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionTwoOfLargestCustomerMember
5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionTwoOfLargestCustomerMember
 
Accounts receivable | Customer concentration risk | GE Healthcare and GE Transportation      
Major customers and concentration of credit risk      
Percentage of concentration risk (as a percent) 18.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionsOneAndTwoOfLargestCustomerMember
  19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionsOneAndTwoOfLargestCustomerMember