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Note 5 - Loans and Related Allowance for Loan and Lease Losses (Details Textual)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loans and Leases Receivable, Net of Deferred Income, Total $ 1,104,085,000       $ 984,258,000       $ 1,104,085,000 $ 984,258,000
Loans and Leases Receivable, Deferred Income, Total 4,400,000       1,300,000       4,400,000 1,300,000
Financing Receivable, Troubled Debt Restructuring 2,900,000       3,600,000       2,900,000 3,600,000
Financing Receivable, Allowance for Credit Loss, Writeoff                 $ 45,000 33,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default                   $ 36,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts                 0 0
Number of Days Past Due (Day)                 90 days  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans                 $ 126,000 $ 377,000
Allowance for Loan and Lease Losses, Write-offs                 3,839,000 1,809,000
Provision for Loan and Lease Losses, Total 2,100,000 $ 4,000,000 $ 1,000,000 $ 2,740,000 460,000 $ 80,000 $ 110,000 $ 240,000 9,840,000 890,000
Threshold For Loans Evaluated For Impairment [Member]                    
Loans and Leases Receivable, before Fees, Gross 500,000               500,000  
Threshold For Loans Evaluated For Impairment [Member] | Outside Consultant [Member]                    
Loans and Leases Receivable, before Fees, Gross 250,000               250,000  
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member]                    
Financing Receivable, before Allowance for Credit Loss, Total 125,000               125,000  
Commercial And Industrial [Member]                    
Loans and Leases Receivable, Net of Deferred Income, Total 232,044,000       89,527,000       232,044,000 89,527,000
Allowance for Loan and Lease Losses, Write-offs                 245,000 519,000
Provision for Loan and Lease Losses, Total                 848,000 (76,000)
Commercial And Industrial [Member] | Provision Fluctuation [Member]                    
Allowance for Loan and Lease Losses, Write-offs                 245,000 438,000
Commercial Real Estate Portfolio Segment [Member] | Provision Fluctuation [Member]                    
Allowance for Loan and Lease Losses, Write-offs                 3,000,000.0  
Residential Portfolio Segment [Member]                    
Loans and Leases Receivable, Net of Deferred Income, Total 233,995,000       234,798,000       233,995,000 234,798,000
Allowance for Loan and Lease Losses, Write-offs                 62,000 361,000
Provision for Loan and Lease Losses, Total                 977,000 280,000
Residential Portfolio Segment [Member] | Provision Fluctuation [Member]                    
Allowance for Loan and Lease Losses, Write-offs                 62,000 360,000
Consumer Portfolio Segment [Member]                    
Loans and Leases Receivable, Net of Deferred Income, Total 9,823,000       $ 14,411,000       9,823,000 14,411,000
Allowance for Loan and Lease Losses, Write-offs                 405,000 735,000
Provision for Loan and Lease Losses, Total                 375,000 628,000
Consumer Portfolio Segment [Member] | Provision Fluctuation [Member]                    
Allowance for Loan and Lease Losses, Write-offs                 383,000 $ 566,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]                    
Loans and Leases Receivable, Deferred Income, Total 2,700,000               2,700,000  
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] | Commercial And Industrial [Member]                    
Loans and Leases Receivable, Net of Deferred Income, Total $ 116,100,000               $ 116,100,000  
Financing Receivable, Allowance for Credit Losses, Percentage of Portfolio 0.40%               0.40%  
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 464,000               $ 464,000  
Provision for Loan and Lease Losses, Total                 $ 464,000