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Note 3 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Past Due and Nonaccrual Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Loans past due 90 days or more and still accruing $ 12 [1] $ 17 [1] $ 170
Nonaccruals 3,691 [1],[2] 3,685 [1],[3] $ 3,452
Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]      
Loans past due 90 days or more and still accruing [1] 0    
Nonaccruals [1],[2] 0    
Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1] 62 [2] 62 [3]  
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1] 0 [2] 0 [3]  
Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due 90 days or more and still accruing [1] 0    
Nonaccruals [1],[2] 0    
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1] 2,907 [2] 2,941 [3]  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1] 654 [2] 654 [3]  
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due 90 days or more and still accruing [1] 0 0  
Nonaccruals [1] 68 [2],[4] 28 [3]  
Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due 90 days or more and still accruing [1] 1 3  
Nonaccruals [1] 0 [2] 0 [3]  
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Loans past due 90 days or more and still accruing [1] 0 1  
Nonaccruals [1] 0 [2] 0 [3]  
Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due 90 days or more and still accruing [1] 11 13  
Nonaccruals [1] 0 [2] 0 [3]  
Financing Receivables 30 to 89 Days Past Due [Member]      
Loans past due and accruing [1] 1,804 1,497  
Financing Receivables 30 to 89 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]      
Loans past due and accruing [1] 16    
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due and accruing [1] 403 365  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Loans past due and accruing [1] 163 106  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due and accruing [1] 29    
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Loans past due and accruing [1] 0 15  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Loans past due and accruing [1] 0 0  
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1] 874 [4] 730  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due and accruing [1] 4 7  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Loans past due and accruing [1] 97 144  
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due and accruing [1] 218 130  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Loans past due and accruing [1] 1,237 1,331  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real Estate Construction Portfolio Segment[Member] | Construction, Other [Member]      
Loans past due and accruing [1] 0    
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Closed End First Liens [Member]      
Loans past due and accruing [1] 62 62  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]      
Loans past due and accruing [1] 0 0  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Real Estate Portfolio Segment [Member] | Equity Lines [Member]      
Loans past due and accruing [1] 0    
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]      
Loans past due and accruing [1] 461 571  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]      
Loans past due and accruing [1] 654 654  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]      
Loans past due and accruing [1] 48 [4] 27  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Credit Card Receivable [Member]      
Loans past due and accruing [1] 1 3  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]      
Loans past due and accruing [1] 0 1  
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Non Real Estate Portfolio Segment [Member] | Other Consumer Loans [Member]      
Loans past due and accruing [1] $ 11 $ 13  
[1] Only classes with past due or nonaccrual loans are shown.
[2] Includes current and past due loans in nonaccrual status. Includes impaired loans in nonaccrual status.
[3] Includes current and past due loans in nonaccrual status. Includes impaired loans in nonaccrual status.
[4] Includes SBA PPP loans past due 30-89 days of $3