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Note 8 - Loans & Allowance for Loan Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Credit
loan
contract
Mar. 31, 2021
USD ($)
contract
Dec. 31, 2021
USD ($)
loan
Accounts Notes And Loans Receivable [Line Items]      
Over drafts reclassified as loans receivables $ 1,511,000   $ 91,000
Total troubled debt restructuring 4,984,000   4,800,000
Net unearned (fees) costs $ (391,000)   (677,000)
Number of newly identified TDRs during the current period | contract 1    
Loans and leases receivable, impaired, commitment to lend $ 2,000   2,000
Financing receivables, impaired, troubled debt restructuring, write-down $ 0 $ 0  
Financing receivable, modifications, subsequent default, number of contracts | contract 0 0  
Performing Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total troubled debt restructuring $ 4,375,000   4,142,000
Nonperforming Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total troubled debt restructuring 609,000   658,000
Paycheck Protection Program [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net unearned (fees) costs 169,000   $ 482,000
Origination flat fee $ 2,500    
Paycheck Protection Program [Member] | Minimum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Percentage of loan origination fees received 1.00%    
Paycheck Protection Program [Member] | Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Percentage of loan origination fees received 5.00%    
Deferred Interest and or Principal Payments of Three to Six Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Total troubled debt restructuring $ 321,000    
Commercial Portfolio Segment [Member] | Deferred Interest and or Principal Payments of Three to Six Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit 2    
Retail Portfolio Segment [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit 0    
Residential Portfolio Segment [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Mortgage loan on real estate number of loan in foreclosure | loan 1    
Mortgage loans in process of foreclosure, amount $ 127,000    
Residential Portfolio Segment [Member] | Maximum [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Loan to value ratio 80.00%    
Commercial and Industrial [Member] | Paycheck Protection Program [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of loans | loan 32   98
Loan amount $ 6,013,000   $ 14,327,000
Residential Buildings and Dwellings [Member] | Credit Concentration Risk [Member] | Commercial Real Estate [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Concentration of loans to lessors percentage of total loans 18.10%   18.00%
Nonresidential Buildings [Member] | Credit Concentration Risk [Member] | Commercial Real Estate [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Concentration of loans to lessors percentage of total loans 25.10%   24.20%