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MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Major customers and concentration of credit risk    
Percentage of concentration risk 5.00%us-gaap_ConcentrationRiskPercentage1  
Largest customer    
Major customers and concentration of credit risk    
Number of divisions 2nsys_ConcentrationRiskNumberOfDivisions
/ us-gaap_MajorCustomersAxis
= nsys_LargestCustomerMember		  
Period of concentration risk 2 years  
Credit concentration risk    
Major customers and concentration of credit risk    
Excess cash balance, number of high credit quality financial institution 1nsys_ExcessCashBalancesNumberOfHighCreditQualityFinancialInstitution
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember		  
Net sales | Customer concentration risk | Division one of largest customer    
Major customers and concentration of credit risk    
Percentage of concentration risk 23.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionOneOfLargestCustomerMember		 20.00%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 | Division two of largest customer    
Major customers and concentration of credit risk    
Percentage of concentration risk 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionTwoOfLargestCustomerMember		 6.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionTwoOfLargestCustomerMember
Net sales | Customer concentration risk | Divisions one & two    
Major customers and concentration of credit risk    
Percentage of concentration risk 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionsOneAndTwoOfLargestCustomerMember		 26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionsOneAndTwoOfLargestCustomerMember
Accounts receivable | Divisions one & two    
Major customers and concentration of credit risk    
Percentage of concentration risk 19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionsOneAndTwoOfLargestCustomerMember		 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_MajorCustomersAxis
= nsys_DivisionsOneAndTwoOfLargestCustomerMember