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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loans Charge-off Period     90 days    
Performance Period     6 years    
Collateral Dependent Loans, Value of Significant Properties $ 200,000   $ 200,000    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     0   $ 33,000
Mortgage Loans in Process of Foreclosure, Amount 441,000   441,000   365,000
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 0 $ 0 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0   0   0
Financing Receivable, Modifications, Number of Contracts 0        
Financing Receivable, Troubled Debt Restructuring, Premodification and Postmodification   390,000   569,000  
Troubled Debt Restructuring, Principal Charge-offs $ 0 0 0 0  
Troubled Debt Restructuring, Specific Allowance $ 0 $ 0 $ 0 $ 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total $ 494,000   $ 494,000   519,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses 20,000   20,000   0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Provision for Loan Losses 20,000 $ 0 $ 20,000    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses, Decreases       $ 2,000  
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts   1 2 1  
Financing Receivable, Troubled Debt Restructuring $ 436,000   $ 436,000    
Commercial Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts   1   2  
Residential Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts   1   1  
Classified Loans [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     321,000   333,000
Overall Qualitative Factor [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     $ 3,300,000   $ 3,100,000
Bank Overdrafts [Member]          
Loans Charge-off Period     45 days