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Note 8 - Income Taxes (Details Textual) $ in Thousands | Dec. 31, 2022 USD ($)
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State and Local Jurisdiction [Member] | Minnesota Department of Revenue [Member] |
Tax Credit Carryforward, Amount | $ 172

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=nsys_MinnesotaDepartmentOfRevenueMember
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Data Type: | na
Balance Type: |
Period Type: |