Note 11 - Commitments and Contingencies (Details Textual)	12 Months Ended
Dec. 31, 2002
Officers [Member]
Disability and Life Insurance Plans, Period (Year)	3 years
Other Participants Except Officers [Member]
Disability and Life Insurance Plans, Period (Year)	2 years

Represents the period of continued participation in health, disability and life insurance plans for the participants in the event of an involuntarily termination.

No definition available.

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