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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Dec. 31, 2017
Debt Securities, Held-to-maturity, Transfer, Amount     $ 119,790    
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax     1,128    
Number of Days of Delinquent Loans Nonaccrual of Interest (Day) 90 days        
Minimum Number of Days of Discontinued Loan Payments for Modified Loan to be Placed on Nonaccrual (Day) 90 days        
Number of Days Past Due (Day) 30 days        
Threshold for Designation to Impaired Status $ 250        
Minimum Number of Days Consumer Loans are Past Due for Losses to be Charged Off (Day) 120 days        
Maximum Number of Days Consumer Loans are Past Due for Losses to be Charged Off (Day) 180 days        
Number of Days Loans Secured by Residential Or Commercial Real Estate Are Past Due for Losses to Be Carged Off (Day) 180 days        
Period of Time Between Issuance of Loan Commitment and Closing and Sale of Loans Lower Range (Day) 30 days        
Period of Time Between Issuance of Loan Commitments and Closing and Sale of Loans Upper Range (Day) 60 days        
Market Capitalization $ 201,387     $ 164,381  
Stockholders' Equity Attributable to Parent, Ending Balance 200,607 $ 183,726 190,238 $ 202,194 $ 184,896
Goodwill, Impairment Loss $ 0 0 0    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0        
Advertising Expense $ 99 120 $ 106    
Number of Loan Modifications for COVID-19 Related Accommodations 388        
Principal Balance of Loans with COVID-19 Related Accommodations $ 182,829        
Loans and Leases Receivable, Net Amount, Total 760,318 $ 726,588      
SBA CARES Act Paycheck Protection Program [Member]          
Loans and Leases Receivable, Net Amount, Total $ 35,992        
National Bank of Blacksburg [Member]          
Noncontrolling Interest, Ownership Percentage by Parent 100.00%        
Minimum [Member]          
Finite-Lived Intangible Asset, Useful Life (Year) 10 years        
Maximum [Member]          
Finite-Lived Intangible Asset, Useful Life (Year) 12 years        
Building [Member]          
Property, Plant and Equipment, Useful Life (Year) 40 years        
Furniture and Fixtures [Member] | Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year) 3 years        
Furniture and Fixtures [Member] | Maximum [Member]          
Property, Plant and Equipment, Useful Life (Year) 10 years        
Computer Equipment [Member]          
Property, Plant and Equipment, Useful Life (Year) 3 years