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Note 7 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0   $ 0   $ 0
Provision for Loan and Lease Losses 256,000 $ 150,000 467,000 $ 225,000  
Impaired Loan [Member]          
Provision for Loan and Lease Losses 3,000 0 5,000 106,000  
Foreclosed Real Estate [Member]          
SEC Schedule III, Real Estate, Write-down or Reserve, Amount $ 0 $ 83,000 $ 228,000 $ 83,000  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]          
Fair Value Inputs, Estimated Selling Costs     33.00%   33.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]          
Fair Value Inputs, Estimated Selling Costs     63.00%   65.00%
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]          
Fair Value Inputs, Estimated Selling Costs     49.00%   39.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Minimum [Member]          
Fair Value Inputs, Estimated Selling Costs     10.00%   10.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Maximum [Member]          
Fair Value Inputs, Estimated Selling Costs     73.00%   77.00%
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member]          
Fair Value Inputs, Estimated Selling Costs     44.00%   38.00%