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Note 3 - Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]          
Proceeds from Sale of Available-for-sale Securities   $ 0 $ 10,550 $ 0  
Available-for-sale Securities, Gross Realized Gains $ 28   163    
Other than Temporary Impairment Losses, Investments     $ 0   $ 0