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Earnings (Loss) Per Share - Schedule of Earnings (Loss) Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings (loss) per share:        
Net earnings (loss) $ 3,020 $ (2,661) $ 7,964 $ 1,927
Weighted average common shares outstanding - basic [1] 4,158,016 4,066,470 4,136,091 4,064,629
Assumed exercise of stock options [1] 16,996 16,324 77,840
Weighted average common shares outstanding - diluted [1] 4,175,012 4,066,470 4,152,415 4,142,469
Net earnings (loss) per share : Basic [1] $ 0.73 $ (0.65) $ 1.93 $ 0.47
Net earnings (loss) per share : Diluted [1] $ 0.72 $ (0.65) $ 1.92 $ 0.47
[1] Per share amounts for the periods ended September 30, 2017 have been adjusted to give effect to the 5% stock dividend paid during December 2017.