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Acquisition (Pro Forma Results) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Acquisition [Abstract]        
Sales $ 48,496 $ 47,477 $ 138,510 $ 133,840
Net income $ 32 $ 1,217 $ (1,379) $ (1,317)