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Segment Information (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers $ 36,215 $ 31,856 $ 29,899
Canada [Member]
     
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers 23,765 19,345 20,224
Middle East [Member]
     
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers 5,688 6,257 4,440
Europe [Member]
     
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers 2,452 1,411 2,154
South and East Asia [Member]
     
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers 2,015 2,373 1,114
Mexico, Central and South America [Member]
     
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers 1,077 1,635 1,124
Other [Member]
     
Foreign net sales to unaffiliated customers      
Foreign net sales to unaffiliated customers $ 1,218 $ 835 $ 843