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Note 8 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0   $ 0   $ 0
Provision for Loan and Lease Losses, Total 455,000 $ 150,000 968,000 $ 617,000  
Impaired Loan [Member]          
Provision for Loan and Lease Losses, Total 51,000 8,000 188,000 13,000  
Foreclosed Real Estate [Member]          
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount $ 0 $ 0 $ 419,000 $ 228,000  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]          
Fair Value Inputs, Estimated Selling Costs     14.00%   14.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]          
Fair Value Inputs, Estimated Selling Costs     100.00%   62.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]          
Fair Value Inputs, Estimated Selling Costs     81.00%   39.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Minimum [Member]          
Fair Value Inputs, Estimated Selling Costs     10.00%   17.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Maximum [Member]          
Fair Value Inputs, Estimated Selling Costs     79.00%   75.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member]          
Fair Value Inputs, Estimated Selling Costs     51.00%   45.00%