Segment Information - Financial Data by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Sales to external customers	$ 17,651	$ 16,878
Operating income	513	458
Interest expense, net	69	56
Other expense (income), net	3	42
Consolidated income before income taxes	441	360
Assets	65,494	67,828	67,828
United States
Sales to external customers	14,227	12,595
Operating income	564	166
Assets	55,656	56,115
Canada
Sales to external customers	1,625	1,658
Operating income	(10)	50
Assets	5,020	6,107
Europe
Sales to external customers	1,799	2,625
Operating income	(41)	242
Assets	$ 4,818	$ 5,606

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The net amount of operating interest income (expense).

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