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Note 4 - Loans and Allowance for Loan Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
USD ($)
May 07, 2020
USD ($)
Dec. 31, 2019
USD ($)
Increase (Decrease) in Other Loans $ (826,000)          
Change In Troubled Debt Restructurings 9.70%          
Impaired Financing Receivable, Related Allowance $ 854,000         $ 807,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 1,516,000         941,000
Financing Receivable, Modifications, Number of Contracts   2 0      
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down       $ 0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts       0    
Financing Receivable, Number of Principal and Interest Payment 95       593  
Financing Receivable, Principal and Interest Deferred Payments $ 15,934       $ 128,262  
Minimum Loan Balance For Loans Evaluated by Risk Categories           750,000
Troubled Debt Restructurings [Member]            
Impaired Financing Receivable, Related Allowance $ 450,000         $ 227,000
Unsecured [Member]            
Percentage of Loan Portfolio 5.13%         5.00%
Residential Portfolio Segment [Member]            
Real Estate Acquired Through Foreclosure $ 0         $ 68,000
Mortgage Loans in Process of Foreclosure, Amount $ 831,000         $ 1,780,000