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Note 8 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0   $ 0   $ 0
Provision for Loan and Lease Losses, Total 825,000 $ 300,000 1,176,000 $ 750,000  
Impaired Loan [Member]          
Provision for Loan and Lease Losses, Total 168,000 (8,000) 167,000 12,000  
Foreclosed Real Estate [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount $ 0 $ 217,000 $ 0 $ 354,000  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]          
Fair Value Inputs, Estimated Selling Costs     47.00%   40.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]          
Fair Value Inputs, Estimated Selling Costs     100.00%   66.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]          
Fair Value Inputs, Estimated Selling Costs     91.00%   47.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member]          
Fair Value Inputs, Estimated Selling Costs     10.00%   38.00%