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Note 6 - Allowance for Loan Losses and Credit Quality Information (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest $ 2,081,000 $ 2,678,000 $ 3,200,000  
Impaired Financing Receivable, Related Allowance 725,000 794,000    
Loan Receivable for Which Value of Collateral Sufficient to Repay 800,000 400,000 400,000  
Impaired Financing Receivable, Interest Income, Accrual Method, Total 171,000 175,000    
Financing Receivable, Troubled Debt Restructuring 2,465,000 2,476,000 3,000,000  
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income 200,000 300,000 400,000  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 800,000 900,000    
Loan to Value Ratio 75.00%      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 0      
Financing Receivable, Troubled Debt Restructuring, Reserves $ 600,000 $ 600,000    
Percentage Reserves For Loan Losses On Troubled Debt Restructurings 7.20% 7.20%    
Loans and Leases Receivable, Allowance, Ending Balance $ 8,564,000 $ 8,686,000 9,311,000 $ 9,903,000
Consumer Portfolio Segment [Member]        
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 659,000 489,000    
Impaired Financing Receivable, Related Allowance 119,000 172,000    
Impaired Financing Receivable, Interest Income, Accrual Method, Total 40,000 23,000    
Financing Receivable, Troubled Debt Restructuring 745,000 522,000    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 17,000    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   1    
Loans and Leases Receivable, Allowance, Ending Balance 1,507,000 $ 1,622,000 1,630,000 $ 1,613,000
Impaired Loans with Sufficient Collateral to Repay Loan [Member]        
Impaired Financing Receivable, Interest Income, Accrual Method, Total 200,000 300,000 300,000  
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 100,000 100,000 100,000  
Trouble Debt Restructurings [Member]        
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 100,000 200,000 200,000  
Nonperforming Financial Instruments [Member]        
Impaired Financing Receivable, Related Allowance 200,000 $ 700,000 $ 900,000  
Financing Receivable, Troubled Debt Restructuring 500,000      
Performing Financial Instruments [Member]        
Financing Receivable, Troubled Debt Restructuring $ 100,000