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Note 7 - 401(k) Retirement Plan (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan, Eligibility Service Period | 90 days |
Defined Contribution Plan, Eligibility Age of Employee | 18 years |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 60.00% |
Defined Contribution Plan, Employer Matching Contribution Rate | 25.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 6.00% |
Defined Contribution Plan, Cost | $ 152 | $ 286

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- Definition Represents the age required for employees to be eligible to participate in the defined contribution plan. + References No definition available. + Details
Name: | nsys_DefinedContributionPlanEligibilityAgeOfEmployee
Namespace Prefix: | nsys_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the service period required for employees to be eligible for the defined contribution plan. + References No definition available. + Details
Name: | nsys_DefinedContributionPlanEligibilityServicePeriod
Namespace Prefix: | nsys_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The rate at which the employer matches the employees' contribution, up to a separately-specified limit, under a defined contribution plan. + References No definition available. + Details
Name: | nsys_DefinedContributionPlanEmployerMatchingContributionRate
Namespace Prefix: | nsys_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration