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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Finite Life Intangible Assets |  |
Amortization expense | $ 5,292 us-gaap_AmortizationOfIntangibleAssets | $ 5,291 us-gaap_AmortizationOfIntangibleAssets
Estimated future annual amortization expense |  |
Estimated future annual amortization expense per annum until maturity | 5,000 nsys_FiniteLivedIntangibleAssetsAmortizationExpensePerAnnumUntilMaturity |
Impairment Analysis |  |
Impairment charges recognized | 74,000 us-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) | $ 1.00 us-gaap_PreferredStockLiquidationPreference |
Preferred stock dividends declared (in dollars per share) | $ 0 us-gaap_PreferredStockDividendsPerShareDeclared | $ 0 us-gaap_PreferredStockDividendsPerShareDeclared
Preferred stock dividends paid (in dollars per share) | $ 0 us-gaap_PreferredStockDividendsPerShareCashPaid | $ 0 us-gaap_PreferredStockDividendsPerShareCashPaid
Product Warranties |  |
Cost of defective product | 0 us-gaap_ProductWarrantyExpense |
Advertising |  |
Advertising expense charged | 162,000 us-gaap_AdvertisingExpense | 146,000 us-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 | 134,250 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 189,250 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Reconciliation of basic and diluted share amounts |  |
Basic weighted average common shares outstanding | 2,742,992 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,742,992 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average common stock equivalents from assumed exercise of stock options (in shares) | 5,833 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 1,144 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average common shares outstanding | 2,748,825 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 2,744,136 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Bond Issue Costs |  |
Finite Life Intangible Assets |  |
Amortized cost | $ 34,395 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = nsys_BondIssueCostsMember | $ 39,687 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = nsys_BondIssueCostsMember

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