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FINANCING AGREEMENTS (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | May 02, 2012 | May 16, 2014
Financing arrangements |  |  |  |
Outstanding balance |  | $ 7,234,983 us-gaap_LinesOfCreditCurrent |  |
Total long-term debt | 4,805,341 us-gaap_LongTermDebt | 4,879,090 us-gaap_LongTermDebt |  |
Current maturities of long-term debt | (732,835)us-gaap_LongTermDebtCurrent | (632,176)us-gaap_LongTermDebtCurrent |  |
Long-term debt - net of current maturities | 4,072,506 us-gaap_LongTermDebtNoncurrent | 4,246,914 us-gaap_LongTermDebtNoncurrent |  |
Future maturity requirements for long-term debt |  |  |  |
2015 | 732,835 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths |  |  |
2016 | 645,752 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo |  |  |
2017 | 637,835 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree |  |  |
2018 | 793,625 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour |  |  |
2019 | 270,067 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive |  |  |
Future | 1,725,227 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive |  |  |
Total long-term debt | 4,805,341 us-gaap_LongTermDebt | 4,879,090 us-gaap_LongTermDebt |  |
Line of credit |  |  |  |
Financing arrangements |  |  |  |
Maximum borrowing capacity |  |  | 13,500,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |
Variable rate basis | three-month LIBOR |  |  |
Interest rate margin on variable rate basis (as a percent) | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Interest rate (as a percent) | 2.75%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Weighted-average interest rate (as a percent) | 2.90%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Outstanding balance | 7,998,184 us-gaap_LinesOfCreditCurrent / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember | 7,234,983 us-gaap_LinesOfCreditCurrent / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |
Unused availability supported by entity's borrowing base | 5,100,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |  |
Real estate term note |  |  |  |
Financing arrangements |  |  |  |
Variable rate basis | three-month LIBOR |  |  |
Interest rate margin on variable rate basis (as a percent) | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNoteMember |  |  |
Interest rate (as a percent) | 3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNoteMember |  |  |
Weighted-average interest rate (as a percent) | 3.40%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNoteMember |  |  |
Real estate term note maturing on March 31, 2027 |  |  |  |
Financing arrangements |  |  |  |
Debt instrument, face amount |  |  | 1,800,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNoteMaturingOn31March2027Member |
Real estate term note expiring on May 31, 2012 |  |  |  |
Financing arrangements |  |  |  |
Debt instrument, face amount |  |  | 1,700,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNoteExpiringOn31May2012Member |
Term loan |  |  |  |
Financing arrangements |  |  |  |
Long-term debt - net of current maturities | 300,000 us-gaap_LongTermDebtNoncurrent / us-gaap_DebtInstrumentAxis = nsys_TermLoanMember |  |  |
Term loan | Maximum |  |  |  |
Financing arrangements |  |  |  |
Debt instrument, face amount |  |  | 1,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nsys_TermLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Term loan maturing on May 31, 2018 |  |  |  |
Financing arrangements |  |  |  |
Debt instrument, face amount |  |  |  | 1,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nsys_TermLoanMay2018Member
Equipment loan maturing on May 31, 2018 |  |  |  |
Financing arrangements |  |  |  |
Debt instrument, face amount |  |  |  | 1,600,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = nsys_EquipmentLoanMay2018Member
Industrial revenue bond payable to the City of Blue Earth, Minnesota |  |  |  |
Financing arrangements |  |  |  |
Interest rate (as a percent) | 0.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember |  |  |
Amount of annual principal payments | 80,000 us-gaap_DebtInstrumentAnnualPrincipalPayment / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember |  |  |
Total long-term debt | 360,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember | 440,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember |  |
Future maturity requirements for long-term debt |  |  |  |
Total long-term debt | 360,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember | 440,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember |  |
Equipment notes maturing in May 2015 |  |  |  |
Financing arrangements |  |  |  |
Variable rate basis | three-month LIBOR |  |  |
Interest rate margin on variable rate basis (as a percent) | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member |  |  |
Interest rate (as a percent) | 3.25%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member |  |  |
Amount of monthly principal payments | 27,000 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member |  |  |
Total long-term debt | 1,569,781 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member | 1,333,463 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member |  |
Future maturity requirements for long-term debt |  |  |  |
Total long-term debt | 1,569,781 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member | 1,333,463 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_EquipmentNotesMaturingInMay2015Member |  |
Real estate term notes |  |  |  |
Financing arrangements |  |  |  |
Variable rate basis | three-month LIBOR |  |  |
Total long-term debt | 2,875,560 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNotesMaturingInMay2027AndDecember2017Member | 3,105,627 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNotesMaturingInMay2027AndDecember2017Member |  |
Future maturity requirements for long-term debt |  |  |  |
Total long-term debt | $ 2,875,560 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNotesMaturingInMay2027AndDecember2017Member | $ 3,105,627 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = nsys_RealEstateTermNotesMaturingInMay2027AndDecember2017Member |  |

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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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