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Note 14 - Investments in non-consolidated companies - Principal Non-consolidated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2021
Disclosure of unconsolidated structured entities [line items]        
Proportion of ownership interest in subsidiary     50.00%  
Value $ 1,608,804 $ 1,540,646 $ 1,608,804 $ 1,383,774
Ternium S.A. [member]        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership     11.46%  
Value $ 1,430,600   $ 1,430,600  
Ternium S.A. [member] | LUXEMBOURG        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership [1] 11.46% 11.46%    
Value [1] $ 1,430,616 $ 1,363,607 $ 1,430,616  
Usiminas [member]        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership     3.96%  
Value $ 123,700   $ 123,700  
Usiminas [member] | Brazil        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership [2] 3.96% 3.07%    
Value [2] $ 123,654 $ 109,534 $ 123,654  
Techgen S.A. [member]        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership     22.00%  
Techgen S.A. [member] | Mexico        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership 22.00% 22.00%    
Value $ 53,556 $ 41,506 $ 53,556  
Global Pipe Company [Member] | Saudi Arabia        
Disclosure of unconsolidated structured entities [line items]        
Percentage of ownership [3]   35.00%    
Proportion of ownership interest in subsidiary [3] 57.30%      
Value [3] $ 23,022  
Other [member]        
Disclosure of unconsolidated structured entities [line items]        
Value $ 978 $ 2,977 $ 978  
[1] Including treasury shares.
[2] At December 31, 2023 the voting rights were 6.76% and at December 31, 2022 were 5.19%.
[3] Consolidated as from May 17, 2023.