REVENUE - Contract Assets (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2018
Increase (decrease) contract assets
Outstanding at the end of period	$ 7,076	$ 7,076
Revenue under contract manufacturing agreements (as percentage)		91.00%
Remaining performance obligations customers upon shipment with payment terms		120 days
ASU 2014-09
Increase (decrease) contract assets
Outstanding at the beginning of period	6,459
Transferred to receivables from contract assets recognized	(5,727)
Product transferred over time	6,344
Outstanding at the end of period	$ 7,076	$ 7,076

The increase (decrease) during the reporting period in product transferred over time.

No definition available.

Name:	nsys_IncreaseDecreaseProductTransferredOverTime
Namespace Prefix:	nsys_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The increase (decrease) during the reporting period in transferred to receivables from contract assets recognized.

+ References

No definition available.

+ Details

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Namespace Prefix:	nsys_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Represents the percentage of revenue under contract manufacturing agreements that was recognized.

+ References

No definition available.

+ Details

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

- Definition

Period in which remaining performance obligation customers upon shipment with payment terms, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	nsys_RevenueRemainingPerformanceObligationCustomersUponShipmentWithPaymentTerms
Namespace Prefix:	nsys_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

+ Details

Name:	us-gaap_ContractWithCustomerAssetNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Period Type: