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Note 13 - Investments in Non-consolidated Companies (Details Textual)
 1 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
R$ / shares
Feb. 13, 2019
USD ($)
Disclosure of unconsolidated structured entities [line items]            
Dividends received from associates, classified as investing activities   $ 66,162,000 $ 75,929,000 $ 278,000    
Total investments in subsidiaries, joint ventures and associates $ 1,540,646,000 $ 1,540,646,000 1,383,774,000 $ 957,352,000    
Forecast period of cash flow projections   5 years        
Nominal growth rate 2.00% 2.00%        
Discount rate used in current estimate of value in use 13.50% 13.50%        
Impairment loss in non-consolidated companies [1]   $ (34,041,000)      
Dividends and distributions declared [2]   64,189,000 78,926,000      
PAO Severstal [member]            
Disclosure of unconsolidated structured entities [line items]            
Impairment loss in non-consolidated companies   14,900,000        
Saudi Steel Pipe Company [member]            
Disclosure of unconsolidated structured entities [line items]            
Corporate guarantee covering obligations $ 137,500,000 137,500,000        
Techgen s.a. [member]            
Disclosure of unconsolidated structured entities [line items]            
Total investments in subsidiaries, joint ventures and associates 41,500,000 41,500,000        
Ternium and Usiminas [member]            
Disclosure of unconsolidated structured entities [line items]            
Dividends and distributions declared   $ 66,200,000 $ 75,900,000      
Usiminas [member]            
Disclosure of unconsolidated structured entities [line items]            
Proportion of voting rights held in associate   5.19%        
Fair value of investments in associates for which there are quoted market prices 53,600,000 $ 53,600,000        
Total investments in subsidiaries, joint ventures and associates $ 109,500,000 $ 109,500,000        
Proportion of ownership interest in associate   3.07%        
Period over which management has projected cash flows   5 years        
Forecast period of cash flow projections   5 years        
Nominal growth rate 2.00% 2.00%        
Impairment loss in non-consolidated companies   $ 19,100,000        
Usiminas [member] | Ordinary shares [member]            
Disclosure of unconsolidated structured entities [line items]            
Closing price, per share (in BRL per share) | (per share) $ 1.42 $ 1.42     R$ 7.41  
Usiminas [member] | Preference shares [member]            
Disclosure of unconsolidated structured entities [line items]            
Closing price, per share (in BRL per share) | (per share) 1.37 1.37     R$ 7.16  
Ternium S.A. [member]            
Disclosure of unconsolidated structured entities [line items]            
Closing price, per ads (in dollars per share) | $ / shares $ 30.56 $ 30.56        
Fair value of investments in associates for which there are quoted market prices $ 702,000,000 $ 702,000,000        
Total investments in subsidiaries, joint ventures and associates 1,363,600,000 $ 1,363,600,000        
Proportion of ownership interest in associate   11.46%        
Techgen s.a. [member]            
Disclosure of unconsolidated structured entities [line items]            
Proportion of ownership interest in associate   22.00%        
Exposure to transportation capacity agreements 42,500,000 $ 42,500,000        
Exposure to purchase and other service agreements 900,000 900,000        
Exposure to the purchase of clean energy certificates 17,200,000 17,200,000        
Loans and receivables 264,200,000 264,200,000        
Techgen s.a. [member] | Tenaris [member]            
Disclosure of unconsolidated structured entities [line items]            
Loans and receivables $ 58,100,000 $ 58,100,000        
Proportion of corporate guarantee covering obligations 22.00% 22.00%        
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%        
Techgen s.a. [member] | Tenaris SA [member]            
Disclosure of unconsolidated structured entities [line items]            
Debt service coverage ratio, covered, percent 22.00% 22.00%        
Letters of credit, covered $ 10,300 $ 10,300        
Techgen s.a. [member] | Ternium S.A. [member]            
Disclosure of unconsolidated structured entities [line items]            
Proportion of ownership interest in associate   48.00%        
Global Pipe Company [Member]            
Disclosure of unconsolidated structured entities [line items]            
Total investments in subsidiaries, joint ventures and associates $ 23,000,000 $ 23,000,000        
Proportion of ownership interest in associate   35.00%        
Global Pipe Company [Member] | Saudi Steel Pipe Company [member]            
Disclosure of unconsolidated structured entities [line items]            
Proportion of ownership interest in associate 22.30%          
Corporate guarantee covering obligations $ 84,000,000 $ 84,000,000        
Proportion of ownership interest in associate after acquisitions 57.30%          
Global Pipe Company [Member] | EEW [member]            
Disclosure of unconsolidated structured entities [line items]            
Proportion of ownership interest in associate 35.00%          
Consideration transferred, acquisition-date fair value $ 9,900,000 $ 9,900,000        
Global Pipe Company [Member] | Other Stakeholder [member]            
Disclosure of unconsolidated structured entities [line items]            
Proportion of ownership interest in associate 20.00%          
[1] Includes an impairment of $19.1 million related to the investment in Usiminas and $14.9 million related to the joint venture with PAO Severstal (“Severstal”). For more information see note 36.
[2] Related to Ternium and Usiminas. During 2022 and 2021 $66.2 million and$75.9 million respectively were collected.