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Note 6 - Other operating income and expenses (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 01, 2021
May 13, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about other operating income and expenses [line items]          
Tax credit from PIS and COFINS recognized in other operating income [1]     $ 35,568 $ 8,164
Tax credit from PIS and COFINS recognized in financial results       $ 18,000  
Geneva Structural Tubes LLC (“Geneva”) | MKK USA Inc          
Disclosure of detailed information about other operating income and expenses [line items]          
Percentage of voting equity interests divested 100.00%        
Aggregate selling price of subsidiary $ 24,300        
Gain on sale of subsidiaries $ 6,800        
Brazil | Subsidiaries          
Disclosure of detailed information about other operating income and expenses [line items]          
Tax expense (credit) from PIS and COFINS   $ 53,000      
Tax credit from PIS and COFINS recognized in other operating income   36,000      
Tax credit from PIS and COFINS recognized in financial results   17,000      
Tax charge related to gain from tax claims of PIS and COFINS   $ 12,000      
[1] On May 13, 2021, the Brazilian Supreme Court issued a final judgment which confirmed that the methodology for calculating PIS and COFINS (Federal Social Contributions on Gross Revenues) tax claims to which taxpayers are entitled to, should exclude from its base the total output of ICMS, calculated on a gross basis. This decision led to a recognition of approximately $53 million tax credit in Brazilian subsidiaries, out of which $36 million were recognized in other operating income and $17 million in financial results (impacting in Finance Income and Finance Cost). In addition the tax charge related to this gain amounted to $12 million.