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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

X

- 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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