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Note 6 - Investment Securities Available for Sale (Details) - Sales of Available for Sale Securities - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sales of Available for Sale Securities [Abstract]        
Proceeds from sales $ 1,721 $ 980 $ 3,312 $ 1,494
Gross realized gains 92 $ 64 140 64
Gross realized losses $ (70)   $ (94) $ (6)