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Note 12 - Investments in Non-consolidated Companies (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 16, 2012 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 R$ / shares | Dec. 31, 2019 USD ($) $ / shares | Feb. 13, 2019 USD ($)
Statement Line Items [Line Items] |  |  |  |  |  |  |
Dividends received from associates, classified as investing activities |  | $ 28,974 | $ 25,722 | $ 22,971 |  |  |
Total investments in subsidiaries, joint ventures and associates |  |  | $ 805,568 | $ 640,294 |  | $ 879,965 |
Several banks, to refinance obligations [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Debt service coverage ratio, covered, percent |  |  |  |  |  | 22.00% |
Letters of credit, covered |  |  |  |  |  | $ 9,800 |
Several banks, to refinance obligations [member] | Techgen s.a. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Debt instruments issued |  |  |  |  |  |  | $ 640,000
Ternium S.A. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 11.46% |  |  |  |  |
Ternium and Usiminas [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Dividends received from associates, classified as investing activities |  | $ 29 |  |  |  |  |
Usiminas [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Fair value of investments in associates for which there are quoted market prices |  |  |  |  |  | 92,000 |
Total investments in subsidiaries, joint ventures and associates |  |  |  |  |  | $ 74,600 |
Usiminas [member] | Ordinary shares [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Closing price, per share (in BRL per share) | (per share) |  |  |  |  | R$ 9.83 | $ 2.44 |
Usiminas [member] | Preference shares [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Closing price, per share (in BRL per share) | (per share) |  |  |  |  | R$ 9.51 | 2.36 |
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Proportion of voting rights held in associate |  | 5.20% | 5.20% |  |  |  |
Proportion of ownership interest in associate |  | 3.07% |  |  |  |  |
Usiminas [member] | Ternium S.A. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Proportion of voting rights held in associate | 27.70% |  |  |  |  |  |
Proportion of ownership interest in associate | 13.80% |  |  |  |  |  |
Ternium S.A. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Closing price, per ads (in dollars per share) | $ / shares |  |  |  |  |  | $ 22 |
Fair value of investments in associates for which there are quoted market prices |  |  |  |  |  | $ 505,400 |
Total investments in subsidiaries, joint ventures and associates |  |  |  |  |  | $ 751,100 |
Proportion of ownership interest in associate |  | 11.46% |  |  |  |  |
Techgen s.a. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 22.00% |  |  |  |  |
Transportation capacity agreement, purchasing capacity of natural gas per day |  |  |  |  |  | 150,000 |
Provision for exposure to transportation capacity agreements |  |  |  |  |  | $ 51,900 |
Provision for exposure to purchase and other service agreements |  |  |  |  |  | 900 |
Provision for exposure to the purchase of clean energy certificates |  |  |  |  |  | 18,200 |
Proceeds From (Repayments of Loans) Receivable From Related Parties |  | $ 40,500 |  |  |  |  |
Loans and receivables |  |  |  |  |  | $ 58,100 |
Proportion of corporate guarantee covering obligations |  |  |  |  |  | 22.00% |
Techgen s.a. [member] | Tecpetrol International S.A. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 30.00% |  |  |  |  |
Techgen s.a. [member] | Ternium S.A. [member] |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 48.00% |  |  |  |  |

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