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Note 11 - Investments in Non-consolidated Companies - Summary of Investments in Non-consolidated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
At the beginning of the year $ 640,294 $ 557,031  
Translation differences [1] 1,848 (9,548) $ 3,473
Equity in earnings of non-consolidated companies 193,994 116,140  
Dividends and distributions received (*) [2] (26,581) (22,971)  
Decrease / increase in equity reserves and others (3,987) (358)  
At the end of the year $ 805,568 $ 640,294 $ 557,031
[1] Tenaris recognized its share over the effects on the adoption of IAS 29, "Financial Reporting in Hyperinflationary Economies" by Ternium ($49.3 million) in other comprehensive income as a currency translation adjustment.
[2] Related to Ternium and Usiminas of which 25.7 were collected during the year.