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Document and Entity Information
Jan. 23, 2024
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jan. 23, 2024
Entity Registrant Name NATIONAL BANKSHARES, INC.
Entity Incorporation State Country Code VA
Entity File Number 0-15204
Entity Tax Identification Number 54-1375874
Entity Address Address Line 1 101 Hubbard Street
Entity Address City Or Town Blacksburg
Entity Address State Or Province VA
Entity Address Postal Zip Code 24060
City Area Code 540
Local Phone Number 951-6300
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol NKSH
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Current Fiscal Year End Date --12-31
Amendment Flag false
Entity Central Index Key 0000796534