Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reportable business segment level include both external and intersegment net sales
Net sales	$ 34,592	$ 32,537	$ 67,618	$ 68,493
Engineered Equipment Technology and Parts Group [Member] | Subtotal [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	23,135	24,353	45,560	51,249
Contracting / Services Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	6,866	6,863	14,411	15,270
Component Parts Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	5,832	4,554	11,280	9,303
Corporate and other [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	(5)	298	19	627
Eliminations [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	(1,236)	(3,531)	(3,652)	(7,956)
United States [Member] | Engineered Equipment Technology and Parts Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	19,506	19,862	38,427	42,106
Canada [Member] | Engineered Equipment Technology and Parts Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	2,015	1,588	3,955	4,362
China [Member] | Engineered Equipment Technology and Parts Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales	1,614	2,002	3,057	3,669
Brazil [Member] | Engineered Equipment Technology and Parts Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales		867	121	987
India [Member] | Engineered Equipment Technology and Parts Group [Member]
Reportable business segment level include both external and intersegment net sales
Net sales		$ 34		$ 125