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Note 2 - Investment Securities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value $ 0   $ 0  
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage 1.10%   1.10%  
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds $ 58,000 $ 176,000 $ 3,000 $ 176,000