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Note 14 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenues from external customers $ 32,728 $ 48,634  
Revenue from Contract with Customer, Including Assessed Tax 32,728 48,634  
Operating loss (4,311) 1,680  
Depreciation and amortization 1,553 1,612  
Capital expenditures 612 670  
Total assets 134,221   $ 119,682
Consolidation, Eliminations [Member]      
Revenues from external customers  
Revenue from Contract with Customer, Including Assessed Tax (2)  
Operating loss  
Depreciation and amortization  
Capital expenditures  
Total assets (200,762)   (194,747)
Intersegment Eliminations [Member]      
Revenue from Contract with Customer, Including Assessed Tax    
Heavy Fabrications [Member]      
Operating loss (1,700)    
Heavy Fabrications [Member] | Operating Segments [Member]      
Revenues from external customers 22,777 38,368  
Revenue from Contract with Customer, Including Assessed Tax 22,777 38,368  
Operating loss   3,541  
Depreciation and amortization 945 963  
Capital expenditures 563 381  
Total assets 55,689   40,438
Heavy Fabrications [Member] | Intersegment Eliminations [Member]      
Revenue from Contract with Customer, Including Assessed Tax    
Gearing [Member]      
Operating loss (989)    
Gearing [Member] | Operating Segments [Member]      
Revenues from external customers 5,349 6,227  
Revenue from Contract with Customer, Including Assessed Tax 5,349 6,227  
Operating loss   (261)  
Depreciation and amortization 458 512  
Capital expenditures 168  
Total assets 43,181   43,319
Gearing [Member] | Intersegment Eliminations [Member]      
Revenue from Contract with Customer, Including Assessed Tax    
Industrial Solutions [Member]      
Operating loss (14)    
Industrial Solutions [Member] | Operating Segments [Member]      
Revenues from external customers 4,602 4,039  
Revenue from Contract with Customer, Including Assessed Tax 4,604 4,039  
Operating loss   192  
Depreciation and amortization 106 104  
Capital expenditures 20 120  
Total assets 8,222   10,244
Industrial Solutions [Member] | Intersegment Eliminations [Member]      
Revenue from Contract with Customer, Including Assessed Tax 2    
Corporate Segment [Member]      
Operating loss (1,608)    
Corporate Segment [Member] | Operating Segments [Member]      
Revenues from external customers  
Revenue from Contract with Customer, Including Assessed Tax    
Operating loss   (1,792)  
Depreciation and amortization 44 33  
Capital expenditures 29 $ 1  
Total assets 227,891   $ 220,428
Corporate Segment [Member] | Intersegment Eliminations [Member]      
Revenue from Contract with Customer, Including Assessed Tax