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Note 19 - Leases (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($)
Lessee, Operating Lease, Early Termination Fee | $ 150

X
- Definition Amounts of early termination under operating lease. + References No definition available. + Details
Name: | nksh_LesseeOperatingLeaseEarlyTerminationFee
Namespace Prefix: | nksh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration