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Note 4 - Securities (Details Textual)
$ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of Temporarily Impaired Securities 145  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 167,081  
Continuous Unrealized Loss Position Aggregate Losses $ 3,952  
Number of Temporarily Impaired Securities Greater than Twelve Months 8  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value $ 12,896 $ 4,695
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses 311 5
National Bank of Blacksburg [Member] | Federal Home Loan Bank of Atlanta [Member]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 574,203  
Restricted Stock [Member]    
Restricted Investments $ 845 1,279
US States and Political Subdivisions Debt Securities [Member]    
Number of Temporarily Impaired Securities 5  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 7,709  
Continuous Unrealized Loss Position Aggregate Losses 190  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value 7,709 635
Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses $ 190 $ 3
Collateralized Mortgage Backed Securities [Member]    
Number of Temporarily Impaired Securities 3  
Available-for-sale and Held to Maturity Securities Continuous Unrealized Loss Position Fair Value $ 5,187  
Continuous Unrealized Loss Position Twelve Months or Longer Fair Value $ 121