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Note 2 - Revenues (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Disaggregation of Revenue [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
   
2020
    
2019
    
2020
    
2019
  
Heavy Fabrications
   $
43,440
     $
33,834
     $
125,424
     $
91,098
  
Gearing
    
7,125
      
7,989
      
20,273
      
27,282
  
Industrial Solutions
    
4,081
      
4,317
      
12,516
      
10,589
  
Eliminations
    
(32
 )    
(2
 )    
(39
 )    
(2
 )
Consolidated
   $
54,614
     $
46,138
     $
158,174
     $
128,967