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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

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- Definition Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 38 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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