Represents the number of divisions related to concentration risk.

No definition available.

Name:	nsys_ConcentrationRiskNumberOfDivisions
Namespace Prefix:	nsys_
Data Type:	xbrli:integerItemType
Balance Type:	na
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

Name:	nsys_ExcessCashBalancesNumberOfHighCreditQualityFinancialInstitution
Namespace Prefix:	nsys_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	nsys_PercentageOfExportSalesToConsolidatedSales
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

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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=64851502&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=73719730&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=64851502&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=73719730&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
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
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_MajorCustomersAxis=nsys_DivisionOneOfLargestCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorCustomersAxis=nsys_DivisionTwoOfLargestCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS (Details) - item	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Largest customer
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	18.00%	13.00%	15.80%	12.20%
Net sales \| Customer concentration risk \| Largest customer
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 \| Division one of largest customer
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	23.20%	19.70%	24.30%	19.00%
Net sales \| Customer concentration risk \| Division two of largest customer
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	1.00%	2.40%	1.50%	4.30%
Net sales \| Customer concentration risk \| Divisions one & two
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)	24.20%	22.10%	25.80%	23.30%
Accounts receivable \| Customer concentration risk \| Largest customer
Major customers and concentration of credit risk
Percentage of concentration risk (as a percent)			19.20%		13.60%