Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net Sales by Business Segment
Net sales	$ 135,052	$ 139,192
Engineered Equipment Technology and Parts Group [Member]
Net Sales by Business Segment
Net sales	88,679	92,498
Engineered Equipment Technology and Parts Group [Member] | United States [Member]
Net Sales by Business Segment
Net sales	75,824	76,416
Engineered Equipment Technology and Parts Group [Member] | Canada [Member]
Net Sales by Business Segment
Net sales	7,611	7,492
Engineered Equipment Technology and Parts Group [Member] | Brazil [Member]
Net Sales by Business Segment
Net sales	121	2,214
Engineered Equipment Technology and Parts Group [Member] | China [Member]
Net Sales by Business Segment
Net sales	4,905	6,147
Engineered Equipment Technology and Parts Group [Member] | India [Member]
Net Sales by Business Segment
Net sales	218	229
Contracting / Services [Member]
Net Sales by Business Segment
Net sales	25,527	26,879
Component Parts Group [Member]
Net Sales by Business Segment
Net sales	20,771	18,771
Corporate and other [Member]
Net Sales by Business Segment
Net sales	$ 75	$ 1,044