REVENUE - Contract Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2018
REVENUE
Outstanding at the beginning of period		$ 6,459
Transferred to receivables from contract assets recognized		(5,648)
Product transferred over time		5,736
Outstanding at the end of period	$ 6,547	$ 6,547
Revenue under contract manufacturing agreements (as percentage)	91.00%	91.00%
Remaining performance obligations for the contract assets term		90 days
Remaining performance obligations for the Remaining Amounts Transferred term		180 days
Remaining performance obligations customers upon shipment with payment terms		120 days

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

No definition available.

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Data Type:	xbrli:monetaryItemType
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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

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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

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Namespace Prefix:	nsys_
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- Definition

Period in which remaining performance obligation is Remaining Amounts Transferred Period expected t, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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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

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

- References

No definition available.

+ Details

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

- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

+ Details

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Balance Type:	na
Period Type:	duration