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401(K) RETIREMENT PLAN (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
401(K) RETIREMENT PLAN |  |
Requisite service period for employees to be eligible for the defined contribution plan | 3 months |
Requisite age for employees to be eligible for the defined contribution plan | 18 years |
Employee contributions limit as a percentage of wages, maximum | 60.00% |
Employer match of employee contributions for 6% of eligible compensation (as a percent) | 25.00% |
Maximum percentage of covered compensation matched 25% by employer | 6.00% |
Contributions made | $ 286 | $ 287

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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
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Data Type: | xbrli:durationItemType
Balance Type: | na
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- 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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration