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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite Life Intangible Assets    
Amortization expense $ 5,292us-gaap_AmortizationOfIntangibleAssets $ 5,291us-gaap_AmortizationOfIntangibleAssets
Estimated future annual amortization expense    
Estimated future annual amortization expense per annum until maturity 5,000nsys_FiniteLivedIntangibleAssetsAmortizationExpensePerAnnumUntilMaturity  
Impairment Analysis    
Impairment charges recognized 74,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf  
Revenue Recognition    
Net sales for services as a maximum percentage of total sales (as a percent) 5.00%us-gaap_ConcentrationRiskPercentage1  
Preferred Stock    
Non-cumulative dividend rate (as a percent) 12.00%us-gaap_PreferredStockDividendRatePercentage  
Liquidation preference (in dollars per share) $ 1.00us-gaap_PreferredStockLiquidationPreference  
Preferred stock dividends declared (in dollars per share) $ 0us-gaap_PreferredStockDividendsPerShareDeclared $ 0us-gaap_PreferredStockDividendsPerShareDeclared
Preferred stock dividends paid (in dollars per share) $ 0us-gaap_PreferredStockDividendsPerShareCashPaid $ 0us-gaap_PreferredStockDividendsPerShareCashPaid
Product Warranties    
Cost of defective product 0us-gaap_ProductWarrantyExpense  
Advertising    
Advertising expense charged 162,000us-gaap_AdvertisingExpense 146,000us-gaap_AdvertisingExpense
Net Income Per Common Share    
Outstanding options included computation of dilutive per-share amounts as effect of all outstanding stock-based awards were antidilutive 134,250us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 189,250us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Reconciliation of basic and diluted share amounts    
Basic weighted average common shares outstanding 2,742,992us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 2,742,992us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common stock equivalents from assumed exercise of stock options (in shares) 5,833us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 1,144us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding 2,748,825us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 2,744,136us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Bond Issue Costs    
Finite Life Intangible Assets    
Amortized cost $ 34,395us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nsys_BondIssueCostsMember
$ 39,687us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nsys_BondIssueCostsMember