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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
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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 In 2020 Ternium changed the functional currency of its Argentine subsidiary to U.S. dollar and IAS 29 is no longer applicable.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.

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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Represents the amount of divdends declared by nonconsolidated companies. + References No definition available. + Details
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- Definition The amount of income (loss) from equity method investments in non-consolidated companies. + References No definition available. + Details
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- Definition Represents the amount of additions during the period in investments in subsidiaries, joint ventures and associates. + References No definition available. + Details
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- Definition Represents the increase in investments in subsidiaries, joint ventures and associates during the period due to business combinations. + References No definition available. + Details
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- Definition The amount of other comprehensive income (loss), before tax, attributable to non-consolidated companies related to exchange differences when financial statements of foreign operations are translated + References No definition available. + Details
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- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, including dividends declared, net of tax. + References No definition available. + Details
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