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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reportable business segment level include both external and intersegment net sales        
Net sales $ 33,102 $ 32,947 $ 100,720 $ 101,440
Engineered Equipment Technology and Parts Group [Member] | Subtotal [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales 22,979 23,337 68,539 74,586
Contracting / Services Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales 6,166 7,284 20,577 22,554
Component Parts Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales 5,524 5,282 16,804 14,585
Corporate and other [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales    253 19 880
Eliminations [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales (1,567) (3,209) (5,219) (11,165)
United States [Member] | Engineered Equipment Technology and Parts Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales 18,775 18,073 57,202 60,179
Canada [Member] | Engineered Equipment Technology and Parts Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales 1,865 1,490 5,820 5,852
China [Member] | Engineered Equipment Technology and Parts Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales 2,166 2,806 5,223 6,475
Brazil [Member] | Engineered Equipment Technology and Parts Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales    864 121 1,851
India [Member] | Engineered Equipment Technology and Parts Group [Member]
       
Reportable business segment level include both external and intersegment net sales        
Net sales $ 173 $ 104 $ 173 $ 229