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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Enterprise-Wide Disclosures    
Percentage of export sales to consolidated net sales 13.00%nsys_PercentageOfExportSalesToConsolidatedSales 12.00%nsys_PercentageOfExportSalesToConsolidatedSales
Total Net Sales $ 112,041,650us-gaap_SalesRevenueNet $ 111,058,439us-gaap_SalesRevenueNet
Net property and equipment 10,888,717us-gaap_PropertyPlantAndEquipmentNet 11,037,160us-gaap_PropertyPlantAndEquipmentNet
Other assets 117,127us-gaap_OtherAssets 122,419us-gaap_OtherAssets
United States    
Enterprise-Wide Disclosures    
Net property and equipment 10,214,279us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
10,560,184us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Other assets 109,401us-gaap_OtherAssets
/ us-gaap_StatementGeographicalAxis
= country_US
114,693us-gaap_OtherAssets
/ us-gaap_StatementGeographicalAxis
= country_US
Mexico    
Enterprise-Wide Disclosures    
Net property and equipment 822,881us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_MX
476,976us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_MX
Other assets 7,726us-gaap_OtherAssets
/ us-gaap_StatementGeographicalAxis
= country_MX
7,726us-gaap_OtherAssets
/ us-gaap_StatementGeographicalAxis
= country_MX
Aerospace and Defense    
Enterprise-Wide Disclosures    
Total Net Sales 14,869,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nsys_AerospaceAndDefenseMember
19,879,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nsys_AerospaceAndDefenseMember
Medical/Life Sciences    
Enterprise-Wide Disclosures    
Total Net Sales 41,402,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nsys_MedicalMember
35,429,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nsys_MedicalMember
Industrial    
Enterprise-Wide Disclosures    
Total Net Sales $ 55,771,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nsys_IndustrialMember
$ 55,750,000us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nsys_IndustrialMember