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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
Goodwill activity related to acquisitions is included in the table below:
 
(Dollars in thousands)
 
December 31,
 
2018
 
2017
Beginning balance
$
19,614

 
$
5,520

Acquisition
2,086

 
14,176

Impact of foreign exchange
(1,452
)
 
(9
)
Adjustment to prior year allocation (1)
(169
)
 
(73
)
Ending balance
$
20,079

 
$
19,614


(1)
The reduction of $0.2 million in 2018 resulted from an adjustment to the goodwill created by the Bolt acquisition. The reduction of $0.1 million in 2017 resulted from a non-cash adjustment to the estimated purchase price allocation to inventory originally recorded in 2016.

Goodwill was tested for impairment in the fourth quarter of 2018 and no adjustment was deemed necessary.