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Note 12 - Investments in Non-consolidated Companies - Principal Non-consolidated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Value $ 640,294 $ 557,031 $ 490,645
Ternium s.a. [member]      
Statement Line Items [Line Items]      
Percentage of ownership 11.46%    
Value $ 563,700    
Ternium s.a. [member] | LUXEMBOURG      
Statement Line Items [Line Items]      
Percentage of ownership [1] 11.46% 11.46%  
Value [1] $ 563,735 $ 491,285  
Usiminas [member]      
Statement Line Items [Line Items]      
Value $ 70,600    
Usiminas [member] | BRAZIL      
Statement Line Items [Line Items]      
Percentage of ownership [2] 3.08% 3.08%  
Value [2] $ 70,642 $ 61,904  
Other [member]      
Statement Line Items [Line Items]      
Value $ 5,917 $ 3,842  
[1] Including treasury shares.
[2] At December 31, 2017 and 2016 the voting rights were 5.2%.