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Note 15 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Revenues from external customers $ 35,503 $ 57,163 $ 109,571 $ 156,879  
Revenue from Contract with Customer, Including Assessed Tax 35,503 57,163 109,571 156,879  
Operating income (loss) 1,178 5,367 4,513 8,865  
Depreciation and amortization 1,671 1,605 4,986 4,772  
Capital expenditures 745 1,338 3,279 5,315  
Total assets 125,124   125,124   $ 135,156
Operating Segments [Member] | Heavy Fabrications [Member]          
Revenues from external customers 20,600 38,326 62,228 103,864  
Revenue from Contract with Customer, Including Assessed Tax 20,600 38,326 62,228 103,864  
Operating income (loss) 2,230 5,791 5,832 12,448  
Depreciation and amortization 999 896 2,932 2,610  
Capital expenditures 588 1,098 1,419 3,916  
Total assets 44,253   44,253   46,931
Operating Segments [Member] | Gearing [Member]          
Revenues from external customers 9,167 11,404 27,958 34,347  
Revenue from Contract with Customer, Including Assessed Tax 9,167 11,404 27,958 34,347  
Operating income (loss) (78) 265 429 1,194  
Depreciation and amortization 534 563 1,627 1,715  
Capital expenditures 123 190 1,471 1,314  
Total assets 44,796   44,796   48,599
Operating Segments [Member] | Industrial Solutions [Member]          
Revenues from external customers 5,736 7,433 19,385 18,668  
Revenue from Contract with Customer, Including Assessed Tax 5,737 7,434 20,193 19,125  
Operating income (loss) 462 846 2,852 2,311  
Depreciation and amortization 109 94 315 280  
Capital expenditures 24 31 362 49  
Total assets 14,576   14,576   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) (1,436) (1,535) (4,600) (7,091)  
Depreciation and amortization 29 52 112 167  
Capital expenditures 10 19 27 36  
Total assets 57,784   57,784   58,487
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (1) (1) (808) (457)  
Operating income (loss) 0 0 0 3  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Total assets (36,285)   (36,285)   $ (35,156)
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax (1) (1) (808) (457)  
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 1 1 808 457  
Intersegment Eliminations [Member] | Corporate Segment [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0