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Note 11 - Restrictions on Dividends (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Proceeds from Dividends Received $ 9,071 $ 7,930 $ 7,853
Payments of Dividends $ 8,071 $ 7,930 $ 7,853
Period of Restriction on Retained Net Income Without Prior Approval 2 years    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval $ 23,890    
National Bankshares Financial Services [Member]      
Payments of Dividends $ 350