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Note 12 - Investments in Non-consolidated Companies - Principal Non-consolidated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Value $ 879,965 $ 805,568 $ 640,294
Ternium S.A. [member]      
Statement Line Items [Line Items]      
Percentage of ownership 11.46%    
Value $ 751,100    
Ternium S.A. [member] | LUXEMBOURG      
Statement Line Items [Line Items]      
Percentage of ownership [1] 11.46% 11.46%  
Value [1] $ 751,105 $ 725,548  
Usiminas [member]      
Statement Line Items [Line Items]      
Value $ 74,600    
Usiminas [member] | BRAZIL      
Statement Line Items [Line Items]      
Percentage of ownership [2] 3.07% 3.07%  
Value [2] $ 74,593 $ 72,988  
Other [member]      
Statement Line Items [Line Items]      
Value $ 54,267 $ 7,032  
[1] Including treasury shares.
[2] At December 31, 2019 and 2018 the voting rights were 5.2%.