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Note 3 - Securities (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Securities Held as Collateral, at Fair Value $ 65,600     $ 65,600   $ 39,200
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 99     99   119
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net   $ 0 $ 546  
Subordinated Debt [Member]            
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net     $ 546      
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]            
Available for Sale Securities, Percent of Portfolio Guaranteed 54.00%     54.00%   49.00%