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Note 13 - Investments in Non-consolidated Companies - Summary of Investments in Non-consolidated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of unconsolidated structured entities [abstract]      
At the beginning of the year $ 879,965 $ 805,568  
Translation differences [1] (31,977) (10,781) $ 1,848
Equity in earnings of non-consolidated companies 108,799 82,036  
Increase due to business combinations 20,635  
Dividends and distributions received [2] (861) (28,037)  
Additions 19,610  
Increase / (decrease) in equity reserves and others 1,426 (9,066)  
At the end of the year $ 957,352 $ 879,965 $ 805,568
[1] For 2018 and 2019 Tenaris recognized its share over the effects on the adoption of IAS 29, “Financial Reporting in Hyperinflationary Economies” by Ternium in other comprehensive income as a currency translation adjustment. In 2020 Ternium changed the functional currency of its Argentine subsidiary to U.S. dollar and IAS 29 is no longer applicable.
[2] Related to Ternium and Usiminas. During 2020 and 2019 $0.3 million and $29.0 million respectively were collected.