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Note 15 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Revenues from external customers $ 50,843 $ 50,012 $ 99,716 $ 91,856  
Revenue from Contract with Customer, Including Assessed Tax 50,843 50,012 99,716 91,856  
Operating income (loss) 2,216 (1,912) 3,498 (3,985)  
Depreciation and amortization 1,562 1,576 3,167 3,095  
Capital expenditures 2,912 1,205 3,977 1,697  
Total assets 156,965   156,965   $ 144,540
Corporate Segment [Member]          
Revenues from external customers   0 0    
Depreciation and amortization   61      
Operating Segments [Member] | Heavy Fabrications [Member]          
Revenues from external customers 33,944 35,575 65,537 62,847  
Revenue from Contract with Customer, Including Assessed Tax 33,944 35,575 65,537 62,847  
Operating income (loss) 3,867 78 6,657 (383)  
Depreciation and amortization 856 862 1,714 1,741  
Capital expenditures 2,156 718 2,818 1,200  
Total assets 65,149   65,149   45,475
Operating Segments [Member] | Gearing [Member]          
Revenues from external customers 10,977 10,107 22,943 20,684  
Revenue from Contract with Customer, Including Assessed Tax 10,977 10,115 22,943 20,700  
Operating income (loss) 348 (585) 929 (697)  
Depreciation and amortization 556 555 1,152 1,031  
Capital expenditures 739 476 1,124 476  
Total assets 53,205   53,205   51,944
Operating Segments [Member] | Industrial Solutions [Member]          
Revenues from external customers 5,922 4,330 11,236 8,325  
Revenue from Contract with Customer, Including Assessed Tax 6,270 5,049 11,692 9,121  
Operating income (loss) 843 32 1,465 (177)  
Depreciation and amortization 92 98 186 201  
Capital expenditures 0 9 18 18  
Total assets 15,150   15,150   12,775
Operating Segments [Member] | Corporate Segment [Member]          
Revenues from external customers 0     0  
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Operating income (loss) (2,845) (1,437) (5,556) (2,728)  
Depreciation and amortization 58   115 122  
Capital expenditures 17 2 17 3  
Total assets 70,570   70,570   62,809
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (348) (727) (456) (812)  
Operating income (loss) 3 0 3 0  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Total assets (47,109)   (47,109)   $ (28,463)
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Intersegment Eliminations [Member] | Heavy Fabrications [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Intersegment Eliminations [Member] | Gearing [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 8 0 16  
Intersegment Eliminations [Member] | Industrial Solutions [Member]          
Revenue from Contract with Customer, Including Assessed Tax 348 719 456 796  
Intersegment Eliminations [Member] | Corporate Segment [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0