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Note 11 - Investments in Non-consolidated Companies (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 16, 2012
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
R$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Statement Line Items [Line Items]            
Dividends received from associates, classified as investing activities   $ 25,722 $ 22,971 $ 20,674    
Total investments in subsidiaries, joint ventures and associates     640,294 557,031   $ 805,568
Cash advances and loans made to related parties   $ 14,740 $ 10,956 $ 116,616    
San Faustin S.A. [member]            
Statement Line Items [Line Items]            
Proportion of ownership interest in associate   60.45%        
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   $ 25,700        
Usiminas [member]            
Statement Line Items [Line Items]            
Fair value of investments in associates for which there are quoted market prices           110,800
Total investments in subsidiaries, joint ventures and associates           $ 73,000
Usiminas [member] | Ordinary shares [member]            
Statement Line Items [Line Items]            
Closing price, per share | (per share)         R$ 11.44 $ 2.95
Usiminas [member] | Preference shares [member]            
Statement Line Items [Line Items]            
Closing price, per share | (per share)         R$ 9.22 2.38
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 | $ / shares           $ 27.10
Fair value of investments in associates for which there are quoted market prices           $ 622,500
Total investments in subsidiaries, joint ventures and associates           725,500
Proportion of ownership interest in associate   11.46%        
Provision for exposure to transportation capacity agreements           55,100
Provision for exposure to purchase and other service agreements           1,800
Provision for exposure to the purchase of clean energy certificates           $ 17,100
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
Proportion of corporate guarantee covering obligations           22.00%
Amount of loan partially guaranteed           $ 600,000
Provision of partial guarantee or collateral by entity           132,000
Cash advances and loans made to related parties   $ 14,700        
Proceeds From (Repayments of Loans) Receivable From Related Parties   $ 9,400        
Techgen s.a. [member] | Subsidiary loans [member]            
Statement Line Items [Line Items]            
Loans and receivables           $ 98,600
Techgen s.a. [member] | San Faustin 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%