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Note 14 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenues from external customers $ 40,389 $ 54,614 $ 119,608 $ 158,174  
Revenue from Contract with Customer, Including Assessed Tax 40,389 54,614 119,608 158,174  
Operating (loss) profit (1,997) (475) (8,619) 2,240  
Depreciation and amortization 1,594 1,567 4,758 4,761  
Capital expenditures 604 668 1,369 1,597  
Revenues 40,389 54,614 119,608 158,174  
Operating profit (loss) (1,997) (475) (8,619) 2,240  
Total assets 114,478   114,478   $ 119,682
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (61) (32) (346) (39)  
Operating (loss) profit 23 0 0 0  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Revenues (61) (32) (346) (39)  
Operating profit (loss) 23 0 0 0  
Total assets (201,267)   (201,267)   (194,747)
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Revenues 0 0 0 0  
Heavy Fabrications [Member] | Operating Segments [Member]          
Revenues from external customers 28,675 43,434 87,277 125,418  
Revenue from Contract with Customer, Including Assessed Tax 28,675 43,440 87,282 125,424  
Operating (loss) profit (445) 2,020   8,760  
Depreciation and amortization 967 928 2,904 2,831  
Capital expenditures 294 601 942 1,199  
Revenues 28,675 43,440 87,282 125,424  
Operating profit (loss) (445) 2,020   8,760  
Total assets 32,989   32,989   40,438
Heavy Fabrications [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 6 5 6  
Operating (loss) profit     (1,873)    
Revenues 0 6 5 6  
Operating profit (loss)     (1,873)    
Gearing [Member] | Operating Segments [Member]          
Revenues from external customers 7,562 7,100 20,315 20,241  
Revenue from Contract with Customer, Including Assessed Tax 7,562 7,125 20,315 20,273  
Operating (loss) profit (219) (1,023)   (1,935)  
Depreciation and amortization 463 488 1,383 1,503  
Capital expenditures 306 42 343 211  
Revenues 7,562 7,125 20,315 20,273  
Operating profit (loss) (219) (1,023)   (1,935)  
Total assets 45,104   45,104   43,319
Gearing [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 25 0 32  
Operating (loss) profit     (2,090)    
Revenues 0 25 0 32  
Operating profit (loss)     (2,090)    
Industrial Solutions [Member] | Operating Segments [Member]          
Revenues from external customers 4,152 4,080 12,016 12,515  
Revenue from Contract with Customer, Including Assessed Tax 4,213 4,081 12,357 12,516  
Operating (loss) profit (108) 87   496  
Depreciation and amortization 105 109 315 319  
Capital expenditures 0 7 26 134  
Revenues 4,213 4,081 12,357 12,516  
Operating profit (loss) (108) 87   496  
Total assets 9,623   9,623   10,244
Industrial Solutions [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 61 1 341 1  
Operating (loss) profit     (169)    
Revenues 61 1 341 1  
Operating profit (loss)     (169)    
Corporate Segment [Member]          
Revenue from Contract with Customer, Including Assessed Tax       0  
Revenues       0  
Corporate Segment [Member] | Operating Segments [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax 0 0 0    
Operating (loss) profit (1,248) (1,559)   (5,081)  
Depreciation and amortization 59 42 156 108  
Capital expenditures 4 18 58 53  
Revenues 0 0 0    
Operating profit (loss) (1,248) (1,559)   (5,081)  
Total assets 228,029   228,029   $ 220,428
Corporate Segment [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Operating (loss) profit     (4,487)    
Revenues $ 0 $ 0 0 $ 0  
Operating profit (loss)     $ (4,487)