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Note 12 - Employee Retention Credit (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Employee Retention Credit Benefits, CARES Act | $ 5,209 | $ 5,209
Cost of Sales [Member] |  |
Employee Retention Credit Benefits, CARES Act | 4,670 | 4,670
Selling Expense [Member] |  |
Employee Retention Credit Benefits, CARES Act | 125 | 125
General and Administrative Expense [Member] |  |
Employee Retention Credit Benefits, CARES Act | $ 414 | $ 414

X
- Definition The amount of benefits recorded as employee benefit credits, as defined in the CARES Act, during the reporting period. + References No definition available. + Details
Name: | nsys_EmployeeRetentionCreditBenefitsCARESAct
Namespace Prefix: | nsys_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=nsys_SellingExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |