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Note 14 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenues from external customers $ 46,491 $ 54,926 $ 79,219 $ 103,560  
Revenue from Contract with Customer, Including Assessed Tax 46,491 54,926 79,219 103,560  
Operating profit (loss) (2,311) 1,035 (6,622) 2,715  
Depreciation and amortization 1,611 1,582 3,164 3,194  
Capital expenditures 153 259 765 929  
Revenues 46,491 54,926 79,219 103,560  
Operating profit (loss) (2,311) 1,035 (6,622) 2,715  
Total assets 129,019   129,019   $ 119,682
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (284) (7) (286) (7)  
Operating profit (loss) (22) 0 (22) 0  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Revenues (284) (7) (286) (7)  
Operating profit (loss) (22) 0 (22) 0  
Total assets (199,893)   (199,893)   (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 35,825 43,614 58,602 81,983  
Revenue from Contract with Customer, Including Assessed Tax 35,830 43,614 58,607 81,983  
Operating profit (loss) 271 3,199   6,740  
Depreciation and amortization 992 939 1,937 1,903  
Capital expenditures 85 217 648 598  
Revenues 35,830 43,614 58,607 81,983  
Operating profit (loss) 271 3,199   6,740  
Total assets 44,588   44,588   40,438
Heavy Fabrications [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 5 0 5 0  
Operating profit (loss)     (1,429)    
Revenues 5 0 5 0  
Operating profit (loss)     (1,429)    
Gearing [Member] | Operating Segments [Member]          
Revenues from external customers 7,404 6,915 12,753 13,142  
Revenue from Contract with Customer, Including Assessed Tax 7,404 6,922 12,753 13,149  
Operating profit (loss) (882) (651)   (912)  
Depreciation and amortization 462 503 920 1,015  
Capital expenditures 37 1 37 169  
Revenues 7,404 6,922 12,753 13,149  
Operating profit (loss) (882) (651)   (912)  
Total assets 45,604   45,604   43,319
Gearing [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 7 0 7  
Operating profit (loss)     (1,871)    
Revenues 0 7 0 7  
Operating profit (loss)     (1,871)    
Industrial Solutions [Member] | Operating Segments [Member]          
Revenues from external customers 3,262 4,397 7,864 8,435  
Revenue from Contract with Customer, Including Assessed Tax 3,541 4,397 8,145 8,435  
Operating profit (loss) (47) 217   410  
Depreciation and amortization 104 106 210 210  
Capital expenditures 6 7 26 127  
Revenues 3,541 4,397 8,145 8,435  
Operating profit (loss) (47) 217   410  
Total assets 8,621   8,621   10,244
Industrial Solutions [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 279 0 281 0  
Operating profit (loss)     (61)    
Revenues 279 0 281 0  
Operating profit (loss)     (61)    
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 profit (loss) (1,631) (1,730)   (3,523)  
Depreciation and amortization 53 34 97 66  
Capital expenditures 25 34 54 35  
Revenues 0 0 0    
Operating profit (loss) (1,631) (1,730)   (3,523)  
Total assets 230,099   230,099   $ 220,428
Corporate Segment [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Operating profit (loss)     (3,239)    
Revenues $ 0 $ 0 0 $ 0  
Operating profit (loss)     $ (3,239)