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Note 12 - Investments in Non-consolidated Companies - Summary of Investments in Non-consolidated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
At the beginning of the year $ 805,568 $ 640,294  
Translation differences [1] (10,781) 1,848 $ (9,548)
Equity in earnings of non-consolidated companies 82,036 193,994  
Increase due to business combinations 20,635  
Dividends and distributions received (*) [2] (28,037) (26,581)  
Additions 19,610  
Decrease / increase in equity reserves and others (9,066) (3,987)  
At the end of the year $ 879,965 $ 805,568 $ 640,294
[1] Since 2018 Tenaris recognizes 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.
[2] Related to Ternium and Usiminas. During 2019, $29.0 million were collected.