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Business Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Property and Equipment Additions        
Total sales $ 33,102 $ 32,947 $ 100,720 $ 101,440
Less intra-segment sales (832) (2,025) (2,862) (5,711)
EET & P (505) (582) (1,058) (1,884)
C/S (210) (489) (1,329) (3,435)
CP    (42)    (42)
Corp.(a) (20) (71) 30 (93)
Net sales to outside customers 33,102 32,947 100,720 101,440
Engineered Equipment Technology and Parts Group [Member] | Subtotal [Member]
        
Property and Equipment Additions        
Total sales 22,979 23,337 68,539 74,586
Less intra-segment sales (723) (1,941) (2,558) (5,293)
EET & P            
C/S (16) (279) (626) (2,754)
CP            
Corp.(a)            
Net sales to outside customers 22,240 21,117 65,355 66,539
Contracting / Services Group [Member]
        
Property and Equipment Additions        
Total sales 6,166 7,284 20,577 22,554
Less intra-segment sales (20) (13) (68) (82)
EET & P (502) (536) (1,037) (1,761)
C/S            
CP    (42)    (42)
Corp.(a)    (8)    (53)
Net sales to outside customers 5,644 6,685 19,472 20,616
Component Parts Group [Member]
        
Property and Equipment Additions        
Total sales 5,524 5,282 16,804 14,585
Less intra-segment sales (89) (71) (236) (336)
EET & P (3) (46) (21) (123)
C/S (194) (207) (693) (639)
CP            
Corp.(a)            
Net sales to outside customers 5,238 4,958 15,854 13,487
Corporate and other [Member]
        
Property and Equipment Additions        
Total sales    253 19 880
Less intra-segment sales            
EET & P            
C/S    (3) (10) (42)
CP            
Corp.(a) (20) (63) 30 (40)
Net sales to outside customers (20) 187 39 798
United States [Member] | Engineered Equipment Technology and Parts Group [Member]
        
Property and Equipment Additions        
Total sales 18,775 18,073 57,202 60,179
Less intra-segment sales (334) (669) (687) (3,495)
EET & P            
C/S (16) (279) (626) (2,754)
CP            
Corp.(a)            
Net sales to outside customers 18,425 17,125 55,889 53,930
Canada [Member] | Engineered Equipment Technology and Parts Group [Member]
        
Property and Equipment Additions        
Total sales 1,865 1,490 5,820 5,852
Less intra-segment sales (10)    63   
EET & P            
C/S            
CP            
Corp.(a)            
Net sales to outside customers 1,855 1,490 5,883 5,852
China [Member] | Engineered Equipment Technology and Parts Group [Member]
        
Property and Equipment Additions        
Total sales 2,166 2,806 5,223 6,475
Less intra-segment sales (379) (1,272) (1,934) (1,798)
EET & P            
C/S            
CP            
Corp.(a)            
Net sales to outside customers 1,787 1,534 3,289 4,677
Brazil [Member] | Engineered Equipment Technology and Parts Group [Member]
        
Property and Equipment Additions        
Total sales    864 121 1,851
Less intra-segment sales            
EET & P            
C/S            
CP            
Corp.(a)            
Net sales to outside customers    864 121 1,851
India [Member] | Engineered Equipment Technology and Parts Group [Member]
        
Property and Equipment Additions        
Total sales 173 104 173 229
Less intra-segment sales          
EET & P          
C/S          
CP          
Corp.(a)          
Net sales to outside customers $ 173 $ 104 $ 173 $ 229