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Note 1 - General | 6 Months Ended
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Jun. 30, 2013
Disclosure Text Block [Abstract] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] | Note 1: General The consolidated financial statements of National Bankshares, Inc. (“NBI”) and its wholly-owned subsidiaries, The National Bank of Blacksburg (“NBB”) and National Bankshares Financial Services, Inc. (“NBFS”) (collectively, the “Company”), conform to accounting principles generally accepted in the United States of America and to general practices within the banking industry. The accompanying interim period consolidated financial statements are unaudited; however, in the opinion of management, all adjustments consisting of normal recurring adjustments, which are necessary for a fair presentation of the consolidated financial statements, have been included. The results of operations for the six months ended June 30, 2013 are not necessarily indicative of results of operations for the full year or any other interim period. The interim period consolidated financial statements and financial information included in this Form 10-Q should be read in conjunction with the notes to consolidated financial statements included in the Company’s 2012 Form 10-K/A. The Company posts all reports required to be filed under the Securities and Exchange Act of 1934 on its web site at www.nationalbankshares.com. Subsequent events have been considered through the date when the Form 10-Q was issued.

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