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Note 13 - Investments in Non-consolidated Companies (Details Textual)
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
R$ / shares
Feb. 19, 2019
USD ($)
Disclosure of unconsolidated structured entities [line items]          
Dividends received from associates, classified as investing activities $ 278,000 $ 28,974,000 $ 25,722,000    
Total investments in subsidiaries, joint ventures and associates $ 957,352,000 879,965,000 $ 805,568,000    
Several banks, to refinance obligations [member]          
Disclosure of unconsolidated structured entities [line items]          
Debt service coverage ratio, covered, percent 22.00%        
Letters of credit, covered $ 9,800,000        
Ternium and Usiminas [member]          
Disclosure of unconsolidated structured entities [line items]          
Dividends received from associates, classified as investing activities 300,000 $ 29,000,000      
Usiminas [member]          
Disclosure of unconsolidated structured entities [line items]          
Fair value of investments in associates for which there are quoted market prices 113,800,000        
Total investments in subsidiaries, joint ventures and associates $ 65,100,000        
Usiminas [member] | Ordinary shares [member]          
Disclosure of unconsolidated structured entities [line items]          
Closing price, per share (in BRL per share) | (per share) $ 3.02     R$ 15.69  
Usiminas [member] | Preference shares [member]          
Disclosure of unconsolidated structured entities [line items]          
Closing price, per share (in BRL per share) | (per share) $ 2.81     R$ 14.61  
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member]          
Disclosure of unconsolidated structured entities [line items]          
Proportion of voting rights held in associate 5.19% 5.19%      
Usiminas [member] | Ternium S.A. [member]          
Disclosure of unconsolidated structured entities [line items]          
Proportion of voting rights held in associate 3.07%        
Proportion of ownership interest in associate 5.19%        
Ternium S.A. [member]          
Disclosure of unconsolidated structured entities [line items]          
Closing price, per ads (in dollars per share) $ 29.08        
Fair value of investments in associates for which there are quoted market prices 668,000,000        
Total investments in subsidiaries, joint ventures and associates $ 830,000,000        
Proportion of ownership interest in associate 11.46%        
Techgen s.a. [member]          
Disclosure of unconsolidated structured entities [line items]          
Total investments in subsidiaries, joint ventures and associates $ 19,500,000        
Proportion of ownership interest in associate 22.00%        
Provision for exposure to transportation capacity agreements $ 48,800,000        
Provision for exposure to purchase and other service agreements 900,000        
Provision for exposure to the purchase of clean energy certificates 17,600,000        
Proceeds From (Repayments of Loans) Receivable From Related Parties   $ 40,500,000      
Loans and receivables $ 58,100,000        
Proportion of corporate guarantee covering obligations 22.00% 22.00%      
Techgen s.a. [member] | Techgen s.a. [member]          
Disclosure of unconsolidated structured entities [line items]          
Proportion of ownership interest in associate 48.00%        
Techgen s.a. [member] | Several banks, to refinance obligations [member]          
Disclosure of unconsolidated structured entities [line items]          
Debt instruments issued         $ 640,000,000
Techgen s.a. [member] | Tecpetrol International S.A. [member]          
Disclosure of unconsolidated structured entities [line items]          
Proportion of ownership interest in associate 30.00%        
Global Pipe Company [Member]          
Disclosure of unconsolidated structured entities [line items]          
Total investments in subsidiaries, joint ventures and associates $ 23,400,000        
Proportion of ownership interest in associate 35.00%        
Global Pipe Company [Member] | Saudi Steel Pipe Company [member]          
Disclosure of unconsolidated structured entities [line items]          
Corporate Guarantee Covering Obligations $ 131,500,000