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Note 6 - Other operating income and expenses (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 01, 2021
May 13, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about other operating income and expenses [line items]          
Tax credit from PIS and COFINS recognized in other operating income     $ 35,568
Tax credit from PIS and COFINS recognized in financial results         $ 18,000
Geneva Structural Tubes LLC (“Geneva”) | MKK USA Inc          
Disclosure of detailed information about other operating income and expenses [line items]          
Percentage of voting equity interests divested 100.00%        
Aggregate selling price of subsidiary $ (24,300)        
Gain on sale of subsidiaries $ 6,800        
Brazil | Subsidiaries          
Disclosure of detailed information about other operating income and expenses [line items]          
Tax expense (credit) from PIS and COFINS   $ (53,000)      
Tax credit from PIS and COFINS recognized in other operating income   36,000      
Tax credit from PIS and COFINS recognized in financial results   17,000      
Tax charge related to gain from tax claims of PIS and COFINS   $ 12,000