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Note 3 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Apr. 24, 2020
Loans Charge-off Period (Day) 90 days        
Performance Period (Year) 6 years        
Collateral Dependent Loans, Value of Significant Properties $ 200,000        
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure 0     $ 170,000  
Mortgage Loans in Process of Foreclosure, Amount 289,000     319,000  
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 0   $ 0    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 0     0  
Financing Receivable, Modifications, Number of Contracts     0    
Financing Receivable, Troubled Debt Restructuring, Premodification and Postmodification $ 265,000        
Troubled Debt Restructuring, Principal Charge-offs   $ 0 $ 0    
Troubled Debt Restructuring, Specific Allowance   $ 0 $ 0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0   0    
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance, Total $ 452,000     466,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses $ 23,000   $ 11,000 12,000  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses     $ 0    
Subsequent Event [Member]          
Financing Receivable, Percentage Payment Extensions Approved Under PPP         11.70%
Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts 1        
Residential Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts 1        
Classified Loans [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total $ 407,000     386,000  
Overall Qualitative Factor [Member]          
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total $ 4,100,000     $ 3,800,000  
Bank Overdrafts [Member]          
Loans Charge-off Period (Day) 45 days