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Note 8 - Equity in earnings of non-consolidated companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 17, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items]        
Equity in earnings of non-consolidated companies   $ 79,411 $ 242,743  
Bargain purchase gain   3,162
Impairment loss on non-consolidated companies   (34,041)
Equity in earnings of non-consolidated companies   95,404 208,702 512,591
Net of Effect Participation Increase [Member]        
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items]        
Equity in earnings of non-consolidated companies   104,897 242,743 512,591
Usiminas        
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items]        
Impairment loss on non-consolidated companies   (19,100) (19,100)  
Net loss related to participation increase in Usiminas $ (25,500) (25,500)    
Usiminas | Effect Participation Increase [Member]        
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items]        
Equity in earnings of non-consolidated companies   25,486
Global Pipe Company [Member]        
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items]        
Remeasurement of previously held interest 4,500 4,506
Bargain purchase gain $ 11,500 $ 11,487