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Note 12 - Investments in Non-consolidated Companies (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 16, 2012
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
R$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Feb. 13, 2019
USD ($)
Statement Line Items [Line Items]              
Dividends received from associates, classified as investing activities   $ 28,974 $ 25,722 $ 22,971      
Total investments in subsidiaries, joint ventures and associates     $ 805,568 $ 640,294   $ 879,965  
Several banks, to refinance obligations [member]              
Statement Line Items [Line Items]              
Debt service coverage ratio, covered, percent           22.00%  
Letters of credit, covered           $ 9,800  
Several banks, to refinance obligations [member] | Techgen s.a. [member]              
Statement Line Items [Line Items]              
Debt instruments issued             $ 640,000
Ternium S.A. [member]              
Statement Line Items [Line Items]              
Proportion of ownership interest in associate   11.46%          
Ternium and Usiminas [member]              
Statement Line Items [Line Items]              
Dividends received from associates, classified as investing activities   $ 29          
Usiminas [member]              
Statement Line Items [Line Items]              
Fair value of investments in associates for which there are quoted market prices           92,000  
Total investments in subsidiaries, joint ventures and associates           $ 74,600  
Usiminas [member] | Ordinary shares [member]              
Statement Line Items [Line Items]              
Closing price, per share (in BRL per share) | (per share)         R$ 9.83 $ 2.44  
Usiminas [member] | Preference shares [member]              
Statement Line Items [Line Items]              
Closing price, per share (in BRL per share) | (per share)         R$ 9.51 2.36  
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member]              
Statement Line Items [Line Items]              
Proportion of voting rights held in associate   5.20% 5.20%        
Proportion of ownership interest in associate   3.07%          
Usiminas [member] | Ternium S.A. [member]              
Statement Line Items [Line Items]              
Proportion of voting rights held in associate 27.70%            
Proportion of ownership interest in associate 13.80%            
Ternium S.A. [member]              
Statement Line Items [Line Items]              
Closing price, per ads (in dollars per share) | $ / shares           $ 22  
Fair value of investments in associates for which there are quoted market prices           $ 505,400  
Total investments in subsidiaries, joint ventures and associates           $ 751,100  
Proportion of ownership interest in associate   11.46%          
Techgen s.a. [member]              
Statement Line Items [Line Items]              
Proportion of ownership interest in associate   22.00%          
Transportation capacity agreement, purchasing capacity of natural gas per day           150,000  
Provision for exposure to transportation capacity agreements           $ 51,900  
Provision for exposure to purchase and other service agreements           900  
Provision for exposure to the purchase of clean energy certificates           18,200  
Proceeds From (Repayments of Loans) Receivable From Related Parties   $ 40,500          
Loans and receivables           $ 58,100  
Proportion of corporate guarantee covering obligations           22.00%  
Techgen s.a. [member] | Tecpetrol International S.A. [member]              
Statement Line Items [Line Items]              
Proportion of ownership interest in associate   30.00%          
Techgen s.a. [member] | Ternium S.A. [member]              
Statement Line Items [Line Items]              
Proportion of ownership interest in associate   48.00%