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Note 14 - Segment Reporting - Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Revenues from external customers $ 50,012 $ 46,491 $ 91,856 $ 79,219  
Revenue from Contract with Customer, Including Assessed Tax 50,012 46,491 91,856 79,219  
Operating income (loss) (1,912) (2,311) (3,985) (6,622)  
Depreciation and amortization 1,576 1,611 3,095 3,164  
Capital expenditures 1,205 153 1,697 765  
Total assets 126,867   126,867   $ 118,047
Consolidation, Eliminations [Member]          
Revenues from external customers 0 0 0 0  
Revenue from Contract with Customer, Including Assessed Tax (727) (284) (812) (286)  
Operating income (loss) 0 (22) 0 (22)  
Depreciation and amortization 0 0 0 0  
Capital expenditures 0 0 0 0  
Total assets (214,988)   (214,988)   (204,347)
Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 0 0 0  
Heavy Fabrications [Member]          
Operating income (loss) 78 271 (383) (1,429)  
Heavy Fabrications [Member] | Operating Segments [Member]          
Revenues from external customers 35,575 35,825 62,847 58,602  
Revenue from Contract with Customer, Including Assessed Tax 35,575 35,830 62,847 58,607  
Depreciation and amortization 862 992 1,741 1,937  
Capital expenditures 718 85 1,200 648  
Total assets 41,648   41,648   37,131
Heavy Fabrications [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 0 5 0 5  
Gearing [Member]          
Operating income (loss) (585) (882) (697) (1,871)  
Gearing [Member] | Operating Segments [Member]          
Revenues from external customers 10,107 7,404 20,684 12,753  
Revenue from Contract with Customer, Including Assessed Tax 10,115 7,404 20,700 12,753  
Depreciation and amortization 555 462 1,031 920  
Capital expenditures 476 37 476 37  
Total assets 51,854   51,854   46,219
Gearing [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 8 0 16 0  
Industrial Solutions [Member]          
Operating income (loss) 32 (47) (177) (61)  
Industrial Solutions [Member] | Operating Segments [Member]          
Revenues from external customers 4,330 3,262 8,325 7,864  
Revenue from Contract with Customer, Including Assessed Tax 5,049 3,541 9,121 8,145  
Depreciation and amortization 98 104 201 210  
Capital expenditures 9 6 18 26  
Total assets 11,769   11,769   10,825
Industrial Solutions [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax 719 279 796 281  
Corporate Segment [Member]          
Operating income (loss) (1,437) (1,631) (2,728) (3,239)  
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 61 53 122 97  
Capital expenditures 2 25 3 54  
Total assets 236,584   236,584   $ 228,219
Corporate Segment [Member] | Intersegment Eliminations [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 0 $ 0 $ 0 $ 0