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Note 14 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Revenues from external customers $ 41,844 $ 32,728    
Revenue from Contract with Customer, Including Assessed Tax 41,844 32,728 $ 154,735  
Operating loss (2,073) (4,311) (10,356)  
Depreciation and amortization 1,519 1,553    
Capital expenditures 492 612    
Total assets 130,455   130,455 $ 118,047
Consolidation, Eliminations [Member]        
Revenues from external customers 0 0    
Revenue from Contract with Customer, Including Assessed Tax (85) (2)    
Operating loss 0 0    
Depreciation and amortization 0 0    
Capital expenditures 0 0    
Total assets (211,585)   (211,585) (204,347)
Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax 0 0    
Heavy Fabrications [Member]        
Operating loss   (1,700)    
Heavy Fabrications [Member] | Operating Segments [Member]        
Revenues from external customers 27,272 22,777    
Revenue from Contract with Customer, Including Assessed Tax 27,272 22,777    
Operating loss (461)      
Depreciation and amortization 879 945    
Capital expenditures 482 563    
Total assets 46,026   46,026 37,131
Heavy Fabrications [Member] | Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax 0 0    
Gearing [Member]        
Operating loss   (989)    
Gearing [Member] | Operating Segments [Member]        
Revenues from external customers 10,576 5,349    
Revenue from Contract with Customer, Including Assessed Tax 10,584 5,349    
Operating loss (112)      
Depreciation and amortization 476 458    
Capital expenditures 0 0    
Total assets 50,529   50,529 46,219
Gearing [Member] | Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax 8 0    
Industrial Solutions [Member]        
Operating loss   (14)    
Industrial Solutions [Member] | Operating Segments [Member]        
Revenues from external customers 3,996 4,602    
Revenue from Contract with Customer, Including Assessed Tax 4,073 4,604    
Operating loss (209)      
Depreciation and amortization 103 106    
Capital expenditures 9 20    
Total assets 11,004   11,004 10,825
Industrial Solutions [Member] | Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax 77 2    
Corporate Segment [Member]        
Operating loss   (1,608)    
Corporate Segment [Member] | Operating Segments [Member]        
Revenues from external customers 0 0    
Revenue from Contract with Customer, Including Assessed Tax 0 0    
Operating loss (1,291)      
Depreciation and amortization 61 44    
Capital expenditures 1 29    
Total assets 234,481   $ 234,481 $ 228,219
Corporate Segment [Member] | Intersegment Eliminations [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0