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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, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
R$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Statement Line Items [Line Items]            
Total investments in subsidiaries, joint ventures and associates     $ 557,031 $ 490,645   $ 640,294
Impairment loss recognised in profit or loss   400,314    
Cash advances and loans made to related parties   $ 7,056 $ 42,394 22,322    
San Faustin S.A. [member]            
Statement Line Items [Line Items]            
Proportion of ownership interest in associate   60.45%        
Usiminas [member]            
Statement Line Items [Line Items]            
Fair value of investments in associates for which there are quoted market prices           123,000
Total investments in subsidiaries, joint ventures and associates           $ 70,600
Impairment loss recognised in profit or loss       $ 28,900    
Usiminas [member] | Ordinary shares [member]            
Statement Line Items [Line Items]            
Closing price, per share | (per share)         R$ 10.83 $ 3.27
Usiminas [member] | Preference shares [member]            
Statement Line Items [Line Items]            
Closing price, per share | (per share)         R$ 9.10 2.75
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   3.08% 3.08%      
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           $ 31.59
Fair value of investments in associates for which there are quoted market prices           $ 725,700
Total investments in subsidiaries, joint ventures and associates           $ 563,700
Discount rate applied to cash flow projections           11.50%
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           $ 58,200
Provision for exposure to purchase and other service agreements           $ 3,900
Proportion of corporate guarantee covering obligations           22.00%
Amount of loan partially guaranteed           $ 720,000
Provision of partial guarantee or collateral by entity           158,400
Cash advances and loans made to related parties   $ 7,000        
Techgen s.a. [member] | Subsidiary loans [member]            
Statement Line Items [Line Items]            
Loans and receivables           $ 93,200
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%