Foreign Customer Sales - Revenues from sales to customers located outside the U.S. (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	$ 29,460	$ 20,780	$ 15,034
Canada, Mexico & South/Central America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	5,759	4,187	3,401
Pacific Rim
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	7,073	6,321	3,177
Europe, Africa & Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Sales	$ 16,628	$ 10,272	$ 8,456