Note 3 - Revenue 1 (Details Textual)	12 Months Ended
Dec. 31, 2019
Percentage of Revenue Transferred to Customers	90.00%
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