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Note 5 - Loans Receivable and the Allowance for Loan Losses (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Credit
loan
contract
Dec. 31, 2020
USD ($)
Credit
loan
contract
Dec. 31, 2019
USD ($)
Accounts Notes And Loans Receivable [Line Items]      
Over drafts reclassified as loans receivables $ 91,000 $ 258,000  
Financing receivable, modifications, recorded investment 4,800,000 5,312,000  
Net deferred (fees) costs (677,000) (1,814,000)  
Financing receivables, impaired, troubled debt restructuring, write-down $ 0 $ 0 $ 5,000
Number of newly identified TDRs during the current period | contract 0 0  
Loans and leases receivable, impaired, commitment to lend $ 2,000 $ 14,000  
Performing Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Financing receivable, modifications, recorded investment 4,142,000 4,469,000  
Nonperforming Financial Instruments [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Financing receivable, modifications, recorded investment 658,000 843,000  
Paycheck Protection Program [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net deferred (fees) costs 482,000 $ 1,909,000  
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 Principal Payments of Six Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Financing receivable, modifications, recorded investment $ 290,000    
Deferred Interest and Principal Payments of Ten Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Financing receivable, modifications, recorded investment $ 42,000    
Deferred Interest and or Principal Payments Between Two and Six Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit   5  
Financing receivable, modifications, recorded investment   $ 829,000  
Deferred Interest and or Principal Payments Between Six and Eight Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit   6  
Financing receivable, modifications, recorded investment   $ 211,000  
Deferred Interest and or Principal Payments Between Eight and Nine Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit   7  
Financing receivable, modifications, recorded investment   $ 15,248,000  
Deferred Interest and or Principal Payments Between Nine and Twelve Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit   11  
Financing receivable, modifications, recorded investment   $ 17,582,000  
Commercial Portfolio Segment [Member] | Deferred Interest and Principal Payments of Six Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit 1    
Retail Portfolio Segment [Member] | Deferred Interest and Principal Payments of Ten Months [Member] | COVID-19 Pandemic [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Number of credits modifications recorded investment | Credit 1    
Residential Portfolio Segment [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Mortgage loan on real estate number of loan in foreclosure | loan 1 3  
Mortgage loans in process of foreclosure, amount $ 127,000 $ 395,000  
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 98 556  
Loan amount $ 14,327,000 $ 72,821,000  
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 18.00% 14.90%  
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 24.20% 19.63%