Represents the number of divisions related to concentration risk.

No definition available.

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Data Type:	xbrli:integerItemType
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Period Type:	duration

- 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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Balance Type:	na
Period Type:	duration

- Definition

Represents the export sales, expressed as a percentage of consolidated net sales.

+ References

No definition available.

+ Details

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Namespace Prefix:	nsys_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ 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 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 2: 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 3: 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 4: 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_MajorCustomersAxis=nsys_LargestCustomerMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_MajorCustomersAxis=nsys_DivisionOneOfLargestCustomerMember
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- Details

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- Details

Name:	us-gaap_MajorCustomersAxis=nsys_DivisionsOneAndTwoOfLargestCustomerMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
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CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Details) - item	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
General Electric
Major customers and concentration of credit risk
Number of divisions	2	2	2	2
Credit concentration risk
Major customers and concentration of credit risk
Excess cash balance, number of high credit quality financial institution	2
Net sales \| Customer concentration risk
Major customers and concentration of credit risk
Percentage of export sales to consolidated net sales	12.00%	13.00%	12.00%	13.00%
Net sales \| Customer concentration risk \| General Electric
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	10.00%	10.00%	10.00%	10.00%
Net sales \| Customer concentration risk \| GE Healthcare
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	18.00%	23.00%	18.00%	24.00%
Net sales \| Customer concentration risk \| GE Transportation
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	11.00%	7.00%	9.00%	5.00%
Net sales \| Customer concentration risk \| Total General Electric
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	29.00%	30.00%	27.00%	29.00%
Accounts receivable \| Customer concentration risk \| Total General Electric
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)			22.00%		20.00%