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Note 15 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenues from external customers $ 36,452 $ 50,843 $ 74,068 $ 99,716  
Revenue from Contract with Customer, Including Assessed Tax 36,452 50,843 74,068 99,716  
Operating income (loss) 1,257 2,216 3,335 3,498  
Depreciation and amortization 1,718 1,562 3,314 3,167  
Capital expenditures 790 2,912 2,534 3,977  
Total assets 122,533   122,533   $ 135,156
Operating Segments [Member] | Heavy Fabrications [Member]          
Revenues from external customers 19,611 33,944 41,628 65,537  
Revenue from Contract with Customer, Including Assessed Tax 19,611 33,944 41,628 65,537  
Operating income (loss) 1,557 3,867 3,601 6,657  
Depreciation and amortization 1,022 856 1,933 1,714  
Capital expenditures 370 2,156 831 2,818  
Total assets 40,558   40,558   46,931
Operating Segments [Member] | Gearing [Member]          
Revenues from external customers 10,454 10,977 18,791 22,943  
Revenue from Contract with Customer, Including Assessed Tax 10,454 10,977 18,791 22,943  
Operating income (loss) 482 348 508 929  
Depreciation and amortization 553 556 1,093 1,152  
Capital expenditures 280 739 1,348 1,124  
Total assets 45,730   45,730   48,599
Operating Segments [Member] | Industrial Solutions [Member]          
Revenues from external customers 6,387 5,922 13,649 11,236  
Revenue from Contract with Customer, Including Assessed Tax 6,463 6,270 14,456 11,692  
Operating income (loss) 623 843 2,390 1,465  
Depreciation and amortization 105 92 205 186  
Capital expenditures 123 0 338 18  
Total assets 14,602   14,602   16,295
Operating Segments [Member] | Corporate Segment [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Operating income (loss) (1,405) (2,845) (3,164) (5,556)  
Depreciation and amortization 38 58 83 115  
Capital expenditures 17 17 17 17  
Total assets 60,100   60,100   58,487
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (76) (348) (807) (456)  
Operating income (loss) 0 3 0 3  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Total assets (38,457)   (38,457)   $ (35,156)
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax (76) (348) (807) (456)  
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 0 0 0  
Intersegment Eliminations [Member] | Industrial Solutions [Member]          
Revenue from Contract with Customer, Including Assessed Tax 76 348 807 456  
Intersegment Eliminations [Member] | Corporate Segment [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0