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Note 26 - Contingencies, Commitments and Restrictions On the Distribution of Profits (Details Textual)
$ / shares in Units, R$ in Thousands, $ in Thousands, € in Millions
12 Months Ended
Oct. 09, 2018
USD ($)
Sep. 01, 2013
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Nov. 19, 2020
BRL (R$)
Nov. 19, 2020
USD ($)
Sep. 28, 2020
BRL (R$)
Sep. 28, 2020
USD ($)
Dec. 31, 2019
Oct. 10, 2018
BRL (R$)
Contingencies, commitments and restrictions on the distribution of profits                        
Term of supply contract (Year)     9 years                  
Performance Guarantees Issued           $ 2,500,000            
Techgen s.a. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Proportion of ownership interest in associate     22.00%                  
Proportion of corporate guarantee covering obligations       22.00% 22.00% 22.00%         22.00%  
Confab [member] | Chubb [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Payments for settlement $ 3,500                      
Settlement, amount ordered to pay | R$                       R$ 13,100
Confab [member] | Veracel Celulose S.A. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Settlement, amount ordered to pay, insurance deductible         R$ 69,900 $ 13,500            
Settlement, amount ordered to pay, damages         59,900 11,500            
Tribunal de Contas da Uniao [member] | Legal proceedings contingent liability [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities             R$ 30,600 $ 5,900        
Tribunal de Contas da Uniao [member] | Legal proceedings contingent liability [member] | Top of range [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Alleged overprice that will be reduced amount                 R$ 9,000 $ 1,700    
Tribunal de Contas da Uniao [member] | Legal proceedings contingent liability [member] | Bottom of range [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Alleged overprice that will be reduced amount                 R$ 401 $ 77    
Transportadora de Gas del Norte S.A. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Term of supply contract (Year)     14 years                  
Purchase commitments           16,800            
Transportadora de Gas del Norte S.A. [member] | Techgen s.a. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Term of supply contract (Year)     25 years                  
Praxair S.A. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Purchase commitments           31,000            
Graftech [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Purchase commitments           10,900            
Air Liquide Mexico S. de R.L. de C.V. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Purchase commitments           19,000            
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Tax contingent liability [member] | BRAZIL                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities         R$ 57,200 $ 11,000            
Fine imposed, percentage of allegedly undue credits       75.00% 75.00% 75.00%            
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Tag-along tender offer to non-controlling interests, percentage   80.00%                    
Tag-along tender offer to non-controlling interests (in BRL per share) | $ / shares   $ 28.8                    
Tag-along tender offer to non-controlling interests, shares (in shares) | shares   182,609,851                    
Tag-along tender offer to non-controlling interests, contingent liability   17.90%                    
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2014 [member] | ITALY                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities       € 25.7   $ 31,600            
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2014, principal [member] | ITALY                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities       20.7   25,500            
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2014, interest and penalties [member] | ITALY                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities       5.0   6,100            
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2015 [member] | ITALY                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities       10.5   12,900            
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2015, principal [member] | ITALY                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities       8.1   10,000            
DALMINE S.p.A. [member] | Tax contingent liability related to fiscal year 2015, interest and penalties [member] | ITALY                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities       € 2.4   2,900            
IPSCO Tubulars, Inc. | Commitments and guarantees                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities           498,300            
Master distribution agreement, term (Year)     6 years                  
Master distribution agreement, term, available extension (Month)     12 months                  
Penalties imposed     $ 0                  
IPSCO Tubulars, Inc. | Product liability litigation                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities           17,600            
IPSCO Tubulars, Inc. | Product liability litigation | Legal proceedings contingent liability [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Estimated financial effect of contingent liabilities           15,000            
TENARIS BAY CITY, INC. [member] | Nucor Steel Memphis Inc. [member]                        
Contingencies, commitments and restrictions on the distribution of profits                        
Term of supply contract (Year)     3 years                  
Purchase commitments           $ 113,400            
Purchase commitments percentage to be made       75.00% 75.00% 75.00%