Segment Information - Financial Data by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Sales to external customers	$ 25,288	$ 22,837
Operating income (loss)	955	827
Interest expense, net	184	130
Other (income) expense, net	(38)	76
Consolidated income before income taxes	809	621
Assets	88,290		$ 81,421
United States
Sales to external customers	22,526	20,134
Operating income (loss)	945	971
Assets	80,144		73,688
Canada
Sales to external customers	1,389	1,244
Operating income (loss)	32	(108)
Assets	4,295		3,709
Europe
Sales to external customers	1,373	1,459
Operating income (loss)	(22)	$ (36)
Assets	$ 3,851		$ 4,024