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MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK (Details) | 12 Months Ended
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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 | 2 nsys_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 | 1 nsys_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

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- Definition Represents the number of divisions related to concentration risk. + References No definition available. + Details
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Namespace Prefix: | nsys_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period of concentration risk. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Represents the number of high credit quality financial institution with whom excess cash balances are maintained for checking accounts. + References No definition available. + Details
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Namespace Prefix: | nsys_
Data Type: | xbrli:integerItemType
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- Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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