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Note 13 - Investments in Non-consolidated Companies (Details Textual) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 R$ / shares | Feb. 13, 2019 USD ($)
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Dividends received from associates, classified as investing activities |  |  | $ 66,162,000 | $ 75,929,000 | $ 278,000 |  |
Total investments in subsidiaries, joint ventures and associates |  | $ 1,540,646,000 | $ 1,540,646,000 | 1,383,774,000 | $ 957,352,000 |  |
Forecast period of cash flow projections |  |  | 5 years |  |  |  |
Nominal growth rate |  | 2.00% | 2.00% |  |  |  |
Discount rate used in current estimate of value in use |  | 13.50% | 13.50% |  |  |  |
Impairment loss in non-consolidated companies | [1] |  | $ (34,041,000) |  |  |  |
Dividends and distributions declared | [2] |  | 64,189,000 | 78,926,000 |  |  |
PAO Severstal [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Impairment loss in non-consolidated companies |  |  | 14,900,000 |  |  |  |
Saudi Steel Pipe Company [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Corporate guarantee covering obligations |  | $ 137,500,000 | 137,500,000 |  |  |  |
Techgen s.a. [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Total investments in subsidiaries, joint ventures and associates |  | 41,500,000 | 41,500,000 |  |  |  |
Ternium and Usiminas [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Dividends and distributions declared |  |  | $ 66,200,000 | $ 75,900,000 |  |  |
Usiminas [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of voting rights held in associate |  |  | 5.19% |  |  |  |
Fair value of investments in associates for which there are quoted market prices |  | 53,600,000 | $ 53,600,000 |  |  |  |
Total investments in subsidiaries, joint ventures and associates |  | $ 109,500,000 | $ 109,500,000 |  |  |  |
Proportion of ownership interest in associate |  |  | 3.07% |  |  |  |
Period over which management has projected cash flows |  |  | 5 years |  |  |  |
Forecast period of cash flow projections |  |  | 5 years |  |  |  |
Nominal growth rate |  | 2.00% | 2.00% |  |  |  |
Impairment loss in non-consolidated companies |  |  | $ 19,100,000 |  |  |  |
Usiminas [member] | Ordinary shares [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Closing price, per share (in BRL per share) | (per share) |  | $ 1.42 | $ 1.42 |  |  | R$ 7.41 |
Usiminas [member] | Preference shares [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Closing price, per share (in BRL per share) | (per share) |  | 1.37 | 1.37 |  |  | R$ 7.16 |
Ternium S.A. [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Closing price, per ads (in dollars per share) | $ / shares |  | $ 30.56 | $ 30.56 |  |  |  |
Fair value of investments in associates for which there are quoted market prices |  | $ 702,000,000 | $ 702,000,000 |  |  |  |
Total investments in subsidiaries, joint ventures and associates |  | 1,363,600,000 | $ 1,363,600,000 |  |  |  |
Proportion of ownership interest in associate |  |  | 11.46% |  |  |  |
Techgen s.a. [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 22.00% |  |  |  |
Exposure to transportation capacity agreements |  | 42,500,000 | $ 42,500,000 |  |  |  |
Exposure to purchase and other service agreements |  | 900,000 | 900,000 |  |  |  |
Exposure to the purchase of clean energy certificates |  | 17,200,000 | 17,200,000 |  |  |  |
Loans and receivables |  | 264,200,000 | 264,200,000 |  |  |  |
Techgen s.a. [member] | Tenaris [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Loans and receivables |  | $ 58,100,000 | $ 58,100,000 |  |  |  |
Proportion of corporate guarantee covering obligations |  | 22.00% | 22.00% |  |  |  |
Techgen s.a. [member] | Several banks, to refinance obligations [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Debt instruments issued |  |  |  |  |  |  | $ 640,000,000
Techgen s.a. [member] | Tecpetrol International S.A. [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 30.00% |  |  |  |
Techgen s.a. [member] | Tenaris SA [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Debt service coverage ratio, covered, percent |  | 22.00% | 22.00% |  |  |  |
Letters of credit, covered |  | $ 10,300 | $ 10,300 |  |  |  |
Techgen s.a. [member] | Ternium S.A. [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 48.00% |  |  |  |
Global Pipe Company [Member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Total investments in subsidiaries, joint ventures and associates |  | $ 23,000,000 | $ 23,000,000 |  |  |  |
Proportion of ownership interest in associate |  |  | 35.00% |  |  |  |
Global Pipe Company [Member] | Saudi Steel Pipe Company [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 22.30% |  |  |  |  |
Corporate guarantee covering obligations |  | $ 84,000,000 | $ 84,000,000 |  |  |  |
Proportion of ownership interest in associate after acquisitions |  | 57.30% |  |  |  |  |
Global Pipe Company [Member] | EEW [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 35.00% |  |  |  |  |
Consideration transferred, acquisition-date fair value |  | $ 9,900,000 | $ 9,900,000 |  |  |  |
Global Pipe Company [Member] | Other Stakeholder [member] |  |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 20.00% |  |  |  |  |
[1] | Includes an impairment of $19.1 million related to the investment in Usiminas and $14.9 million related to the joint venture with PAO Severstal (“Severstal”). For more information see note 3 6.
[2] | Related to Ternium and Usiminas. During 202 2 and 20 2 1 $66.2 million and$75.9 million respectively were collected.

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