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Note 8 - Loans & Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Credit
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
loan
Credit
contract
Sep. 30, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Bank overdrafts $ 86,238   $ 86,238   $ 224,000
Financing receivable, modifications, recorded investment 5,564,000   5,564,000   5,891,000
Net unearned (fees) costs (2,321,000)   $ (2,321,000)   197,000
Number of newly identified TDRs during the current period | contract     0    
Loans and leases receivable, impaired, commitment to lend 13,000   $ 13,000   0
Financing receivables, impaired, troubled debt restructuring, write-down 0 $ 0 $ 0 $ 0  
Financing receivable, modifications, subsequent default, number of contracts | contract     0 0  
Performing Financial Instruments [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Financing receivable, modifications, recorded investment 4,665,000   $ 4,665,000   4,760,000
Nonperforming Financial Instruments [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Financing receivable, modifications, recorded investment 899,000   899,000   $ 1,131,000
Paycheck Protection Program [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Net unearned (fees) costs 2,406,000   $ 2,406,000    
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%    
Commercial and Industrial [Member] | Paycheck Protection Program [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of loans | loan     660    
Loan amount 82,475,000   $ 82,475,000    
COVID-19 Pandemic [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Financing receivable, modifications, recorded investment $ 66,148,000   $ 66,148,000    
Deferred Interest and or Principal Payments Between Three and Six Months [Member] | COVID-19 Pandemic [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of credits modifications recorded investment | Credit 8   8    
Financing receivable, modifications, recorded investment $ 568,000   $ 568,000    
Deferred Interest and or Principal Payments Between Five and Six Months [Member] | COVID-19 Pandemic [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of credits modifications recorded investment | Credit 102   102    
Financing receivable, modifications, recorded investment $ 38,120,000   $ 38,120,000    
Deferred Interest and or Principal Payments Between Six and Nine Months [Member] | COVID-19 Pandemic [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Number of credits modifications recorded investment | Credit 17   17    
Financing receivable, modifications, recorded investment $ 27,460,000   $ 27,460,000    
Commercial Portfolio Segment [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Percentage of financing receivable modifications due to pandemic     8.40%    
Commercial Portfolio Segment [Member] | COVID-19 Pandemic [Member] | Commercial and Industrial [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Financing receivable, modifications, recorded investment 3,445,000   $ 3,445,000    
Retail Portfolio Segment [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Percentage of financing receivable modifications due to pandemic     2.60%    
Residential Portfolio Segment [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Mortgage loan on real estate number of loan in foreclosure | loan     3    
Mortgage loans in process of foreclosure, amount $ 398,000   $ 398,000    
Residential Portfolio Segment [Member] | Maximum [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Loan to value ratio     80.00%    
Residential Buildings and Dwellings [Member] | Credit Concentration Risk [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Concentration of loans to lessors percentage of total loans     14.40%   16.60%
Nonresidential Buildings [Member] | Credit Concentration Risk [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Concentration of loans to lessors percentage of total loans     19.00%   18.30%