Note 3 - Revenue 1 (Details Textual)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Percentage of Revenue Transferred to Customers	91.00%		91.00%
Revenue Remaining Performance Obligation, Customers Upon Shipment With Payment Terms		120 days

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.

No definition available.

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