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Note 19 - Fair Value Measurements (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
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, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial and Nonfinancial Liabilities, Fair Value Disclosure         $ 0                 $ 0  
Provision for Loan and Lease Losses, Total $ 200,000 $ 455,000 $ 316,000 $ 197,000 $ 298,000 $ 150,000 $ 256,000 $ 211,000 $ 220,000 $ 200,000 $ 150,000 $ 75,000 $ 1,168,000 915,000 $ 645,000
Impaired Loan [Member]                              
Provision for Loan and Lease Losses, Total                         231,000 39,000 158,000
Foreclosed Real Estate [Member]                              
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount                         $ 419,000 $ 263,000 $ 80,000
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member]                              
Fair Value Inputs, Estimated Selling Costs                         20.00% 14.00%  
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member]                              
Fair Value Inputs, Estimated Selling Costs                         62.00% 62.00%  
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                         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%