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Note 14 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Revenues from external customers $ 44,843 $ 40,389 $ 136,699 $ 119,608  
Revenue from Contract with Customer, Including Assessed Tax 44,843 40,389 136,699 119,608  
Operating income (loss) (520) (1,997) (4,505) (8,619)  
Depreciation and amortization 1,486 1,594 4,581 4,758  
Capital expenditures 1,060 604 2,757 1,369  
Total assets 126,064   126,064   $ 118,047
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (7) (61) (819) (346)  
Operating income (loss) (3) 23 (3) 0  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Total assets (216,929)   (216,929)   (204,347)
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Heavy Fabrications [Member]          
Operating income (loss) 372 (445) (11) (1,873)  
Heavy Fabrications [Member] | Operating Segments [Member]          
Revenues from external customers 30,640 28,675 93,486 87,277  
Revenue from Contract with Customer, Including Assessed Tax 30,640 28,675 93,486 87,282  
Depreciation and amortization 852 967 2,593 2,904  
Capital expenditures 976 294 2,176 942  
Total assets 38,975   38,975   37,131
Heavy Fabrications [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 5  
Gearing [Member]          
Operating income (loss) 624 (219) (73) (2,090)  
Gearing [Member] | Operating Segments [Member]          
Revenues from external customers 10,190 7,562 30,874 20,315  
Revenue from Contract with Customer, Including Assessed Tax 10,190 7,562 30,890 20,315  
Depreciation and amortization 477 463 1,507 1,383  
Capital expenditures 64 306 540 343  
Total assets 51,356   51,356   46,219
Gearing [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 16 0  
Industrial Solutions [Member]          
Operating income (loss) (191) (108) (368) (169)  
Industrial Solutions [Member] | Operating Segments [Member]          
Revenues from external customers 4,013 4,152 12,339 12,016  
Revenue from Contract with Customer, Including Assessed Tax 4,020 4,213 13,142 12,357  
Depreciation and amortization 98 105 299 315  
Capital expenditures 20 0 38 26  
Total assets 11,277   11,277   10,825
Industrial Solutions [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 7 61 803 341  
Corporate Segment [Member]          
Operating income (loss) (1,322) (1,248) (4,050) (4,487)  
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 0  
Depreciation and amortization 59 59 182 156  
Capital expenditures 0 4 3 58  
Total assets 241,385   241,385   $ 228,219
Corporate Segment [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0