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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net earnings $ 2,094 $ 2,529 $ 6,616 $ 7,922
Weighted average common shares outstanding - basic [1] 3,645,618 3,506,440 3,605,509 3,504,487
Assumed exercise of stock options [1] 69,165 115,397 67,129 101,674
Weighted average common shares outstanding - diluted [1] 3,714,783 3,621,837 3,672,638 3,611,251
Net earnings per share :        
Basic [1],[2] $ 0.57 $ 0.72 $ 1.83 $ 2.26
Diluted [1],[2] $ 0.56 $ 0.70 $ 1.80 $ 2.19
[1] Share and per share values for the periods ended September 30, 2015 have been adjusted to give effect to the 5% stock dividend paid during December 2015.
[2] Per share amounts for the periods ended September 30, 2015 have been adjusted to give effect to the 5% stock dividend paid during December 2015.