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Note 4 - Securities (Details Textual)
$ in Thousands
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Number of Temporarily Impaired Securities 37  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 54,914  
Continuous Unrealized Loss Position Aggregate Losses $ 439  
Number of Temporarily Impaired Securities Greater than Twelve Months 2  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value $ 5,637 $ 39,553
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses 16 85
National Bank of Blacksburg [Member] | Federal Home Loan Bank of Atlanta [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 562,220  
Restricted Stock [Member]    
Restricted Investments $ 1,279 1,220
US States and Political Subdivisions Debt Securities [Member]    
Number of Temporarily Impaired Securities 1  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 626  
Continuous Unrealized Loss Position Aggregate Losses 12  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value 626 591
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses $ 12 $ 48
Collateralized Mortgage Backed Securities [Member]    
Number of Temporarily Impaired Securities 1  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 5,011  
Continuous Unrealized Loss Position Aggregate Losses $ 4