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Note 8 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0   $ 0
Provision for Loan and Lease Losses, Total 351,000 $ 450,000  
Real Estate Acquired through Foreclosure, Fair Value Disclosure 0    
Impaired Loan [Member]      
Provision for Loan and Lease Losses, Total 1,000 20,000  
Foreclosed Real Estate [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount $ 0 $ 137,000  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]      
Fair Value Inputs, Estimated Selling Costs 40.00%   40.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]      
Fair Value Inputs, Estimated Selling Costs 47.00%   66.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]      
Fair Value Inputs, Estimated Selling Costs 45.00%   47.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member]      
Fair Value Inputs, Estimated Selling Costs     38.00%