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Note 4 - Securities (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 15, 2016
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions     119 59  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net     $ 546
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities     $ 0 $ 0  
Subordinated Debt [Member]          
Debt Instrument, Face Amount   $ 3,200      
Debt Instrument Redemption Percentage 100.00%        
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net   $ 546