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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Net sales by product line |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 30,905 | $ 25,633 | $ 25,902 | $ 22,533 | $ 20,250 | $ 24,329 | $ 33,595 | $ 25,012 | $ 104,973 | $ 103,186 | $ 74,235
Heat transfer equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales by product line |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 43,764 | 27,927 | 28,923
Vacuum equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales by product line |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 22,891 | 43,635 | 26,227
All other [Member] |  |  |  |  |  |  |  |  |  |  |
Net sales by product line |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 38,318 | $ 31,624 | $ 19,085

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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