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Note 8 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum [Member]            
Fair Value Inputs, Estimated Selling Costs       32.00%   10.00%
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum [Member]            
Fair Value Inputs, Estimated Selling Costs       60.00%   59.00%
Impaired Loan [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]            
Fair Value Inputs, Estimated Selling Costs       45.00%   16.00%
Impaired Loan [Member]            
Provision for Loan and Lease Losses $ 0 $ 1,000   $ 106,000 $ 83,000  
Foreclosed Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum [Member]            
Fair Value Inputs, Estimated Selling Costs       8.00%   9.00%
Foreclosed Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum [Member]            
Fair Value Inputs, Estimated Selling Costs       41.00%   43.00%
Foreclosed Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]            
Fair Value Inputs, Estimated Selling Costs       39.00%   30.00%
Foreclosed Real Estate [Member]            
SEC Schedule III, Real Estate, Write-down or Reserve, Amount 0 0 $ 83,000   0  
Provision for Loan and Lease Losses 200,000 $ 0   $ 425,000 $ 50,000  
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0     $ 0   $ 0