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Note 10 - Restrictions on Dividends (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries | $ 14,508 |  | $ 22,000
Period of Restriction on Retained Net Income Without Prior Approval (Year) |  | 2 years |
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval | $ 0 | $ 0 |

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- Definition Period of restrictions on banking or savings institution's ability to pay dividends. + References No definition available. + Details
Name: | nksh_PeriodOfRestrictionOnRetainedNetIncomeWithoutPriorApproval
Namespace Prefix: | nksh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690 + Details
Name: | us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References No definition available. + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant