Note 2 - Business Combinations - Supplemental Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Net interest income $ 58,708 $ 52,022
Net earnings $ 10,727 $ 8,961
Diluted earnings per common share (in dollars per share) $ 1.02 $ 1.01