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Note 8 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0   $ 0
Provision for Loan and Lease Losses, Total 450,000 $ 197,000  
Impaired Loan [Member]      
Provision for Loan and Lease Losses, Total 20,000 65,000  
Foreclosed Real Estate [Member]      
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount $ 137,000 $ 0  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]      
Fair Value Inputs, Estimated Selling Costs 14.00%   20.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]      
Fair Value Inputs, Estimated Selling Costs 66.00%   62.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]      
Fair Value Inputs, Estimated Selling Costs 46.00%   39.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Minimum [Member]      
Fair Value Inputs, Estimated Selling Costs 17.00%   10.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Maximum [Member]      
Fair Value Inputs, Estimated Selling Costs 50.00%   79.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member]      
Fair Value Inputs, Estimated Selling Costs 17.00%   51.00%