Note 8 - Employee Retention Credit (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Employee Retention Credit Benefits, CARES Act	$ 5,209	$ 5,209

The amount of benefits recorded as employee benefit credits, as defined in the CARES Act, during the reporting period.

No definition available.

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