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Note 5 - Loans and Related Allowance for Loan and Lease Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Loans and Leases Receivable, Deferred Income, Total   $ 1,300,000 $ 1,600,000  
Financing Receivable, Troubled Debt Restructuring   3,600,000 4,400,000  
Financing Receivable, Allowance for Credit Loss, Writeoff   33,000 $ 459,000  
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   90 days    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   $ 342,000 $ 456,000  
Allowance for Loan and Lease Losses, Write-offs   1,809,000 1,118,000  
Commercial And Industrial [Member]        
Allowance for Loan and Lease Losses, Write-offs   519,000 610,000  
Consumer Portfolio Segment [Member]        
Allowance for Loan and Lease Losses, Write-offs   735,000 220,000  
Real Estate Construction Porfolio Segment [Member]        
Allowance for Loan and Lease Losses, Write-offs    
Loans and Leases Receivable, Historical Loss Rate (0.127%)     0.775%
Threshold For Loans Evaluated For Impairment [Member]        
Loans and Leases Receivable, before Fees, Gross   500,000    
Threshold For Loans Evaluated For Impairment [Member] | Outside Consultant [Member]        
Loans and Leases Receivable, before Fees, Gross   250,000    
Threshold For Loans Evaluated For Impairment [Member] | Criticized Relationships [Member]        
Loans and Leases Receivable, before Fees, Gross   125,000    
Provision Fluctuation [Member] | Commercial And Industrial [Member]        
Allowance for Loan and Lease Losses, Write-offs   438,000    
Provision Fluctuation [Member] | Real Estate Mortgage Portfolio Segment [Member]        
Allowance for Loan and Lease Losses, Write-offs   360,000    
Provision Fluctuation [Member] | Consumer Portfolio Segment [Member]        
Allowance for Loan and Lease Losses, Write-offs   $ 566,000