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Note 15 - Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
Heavy Fabrications
    
Gearing
    
Industrial Solutions
    
Corporate
    
Eliminations
    
Consolidated
  
For the Year Ended December 31, 2020
      
 
      
 
      
 
      
 
      
 
      
 
Revenues from external customers
   $
155,096
      
25,104
      
18,296
      
—
      
—
     $
198,496
  
Intersegment revenues
    
102
      
32
      
3
      
—
      
(137
 )    
—
  
Net revenues
    
155,198
      
25,136
      
18,299
      
—
      
(137
 )    
198,496
  
Operating profit (loss)
    
10,385
      
(3,883
 )    
881
      
(6,953
 )    
(8
 )    
422
  
Depreciation and amortization
    
3,736
      
1,961
      
430
      
152
      
—
      
6,279
  
Capital expenditures
    
1,049
      
283
      
159
      
56
      
—
      
1,547
  
Total assets    
40,438
      
43,319
      
10,244
      
220,428
      
(194,747
 )    
119,682
  
   
Heavy Fabrications
    
Gearing
    
Industrial Solutions
    
Corporate
    
Eliminations
    
Consolidated
  
For the Year Ended December 31, 2019
      
 
      
 
      
 
      
 
      
 
      
 
Revenues from external customers
   $
128,686
     $
34,877
     $
14,657
     $
—
     $
—
     $
178,220
  
Intersegment revenues
    
—
      
—
      
7
      
—
      
(7
 )    
—
  
Net revenues
    
128,686
      
34,877
      
14,664
      
—
      
(7
 )    
178,220
  
Operating profit (loss)
    
1,861
      
3,237
      
(1,059
 )    
(6,396
 )    
—
      
(2,357
 )
Depreciation and amortization
    
3,976
      
1,981
      
1,362
      
178
      
—
      
7,497
  
Capital expenditures
    
992
      
769
      
52
      
31
      
—
      
1,844
  
Total assets
    
41,432
      
47,022
      
8,893
      
239,629
      
(214,110
 )    
122,866