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Business Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income from Operations (loss) by business segment
Income from operations	$ 16,683	$ 12,368
Engineered Equipment Technology and Parts Group [Member]
Income from Operations (loss) by business segment
Income from operations	15,562	12,381
Contracting / Services Group (a) [Member]
Income from Operations (loss) by business segment
Income from operations	3,461	3,145
Component Parts Group [Member]
Income from Operations (loss) by business segment
Income from operations	4,198	3,372
Corporate and other [Member]
Income from Operations (loss) by business segment
Income from operations	(6,474)	(6,418)
Eliminations [Member]
Income from Operations (loss) by business segment
Income from operations	$ (64)	$ (112)

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration