Segment Information - Financial Data by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Sales to external customers	$ 20,363	$ 19,036	$ 64,835	$ 57,466
Operating income (loss)	1,359	1,120	4,895	3,763
Interest expense, net	83	70	200	191
Other expense (income), net	7	20	93	(2)
Consolidated income before income taxes	1,269	1,030	4,602	3,574
United States
Sales to external customers	16,541	15,020	51,702	44,104
Operating income (loss)	1,240	923	3,992	2,904
Canada
Sales to external customers	2,170	1,829	7,137	7,008
Operating income (loss)	182	114	753	863
Europe
Sales to external customers	1,652	2,187	5,996	6,354
Operating income (loss)	$ (63)	$ 83	$ 149	$ (4)