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Note 20 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0       $ 0               $ 0 $ 0  
Provision for Loan and Lease Losses $ 298,000 $ 150,000 $ 256,000 $ 211,000 $ 220,000 $ 200,000 $ 150,000 $ 75,000 $ 50,000 915,000 645,000 $ 50,000
Impaired Loan [Member]                              
Provision for Loan and Lease Losses                         39,000 158,000 154,000
Foreclosed Real Estate [Member]                              
SEC Schedule III, Real Estate, Write-down or Reserve, Amount                         $ 263,000 $ 80,000 $ 100,000
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]                              
Fair Value Inputs, Estimated Selling Costs                         14.00% 33.00%  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]                              
Fair Value Inputs, Estimated Selling Costs                         62.00% 65.00%  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member]                              
Fair Value Inputs, Estimated Selling Costs                         39.00% 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                         75.00% 77.00%  
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member]                              
Fair Value Inputs, Estimated Selling Costs                         45.00% 38.00%