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Business Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Intra-segment and Inter-segment Revenues            
Income (loss) from Operations $ 4,251 $ 3,310 $ 12,283 $ 8,570    
Property and Equipment Additions 102 398 234 654    
Depreciation and Amortization 300 340 910 1,086    
Identifiable Assets 84,455   84,455   79,345  
Goodwill 14,777   14,777   14,661 14,713
Engineered Equipment Technology and Parts Group [Member]
            
Intra-segment and Inter-segment Revenues            
Income (loss) from Operations 3,946 3,294 11,110 8,303    
Property and Equipment Additions 57 78 109 144    
Depreciation and Amortization 146 174 445 618    
Identifiable Assets 48,498   48,498   51,480  
Goodwill 14,777   14,777   14,661  
Contracting / Services Group [Member]
            
Intra-segment and Inter-segment Revenues            
Income (loss) from Operations 836 903 2,520 2,281    
Property and Equipment Additions 14 63 44 72    
Depreciation and Amortization 53 59 163 173    
Identifiable Assets 26,837   26,837   18,588  
Component Parts Group [Member]
            
Intra-segment and Inter-segment Revenues            
Income (loss) from Operations 966 820 3,378 2,674    
Property and Equipment Additions 21 236 59 268    
Depreciation and Amortization 48 49 144 132    
Identifiable Assets 6,078   6,078   5,577  
Corporate and other [Member]
            
Intra-segment and Inter-segment Revenues            
Income (loss) from Operations (1,455) (1,613) (4,667) (4,555)    
Property and Equipment Additions 10 21 22 170    
Depreciation and Amortization 53 58 158 163    
Identifiable Assets 8,568   8,568   9,705  
Eliminations [Member]
            
Intra-segment and Inter-segment Revenues            
Income (loss) from Operations (42) (94) (58) (133)    
Identifiable Assets $ (5,526)   $ (5,526)   $ (6,005)