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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, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 R$ / shares | Dec. 31, 2017 USD ($) $ / shares
Statement Line Items [Line Items] |  |  |  |  |  |
Total investments in subsidiaries, joint ventures and associates |  |  | $ 557,031 | $ 490,645 |  | $ 640,294
Impairment loss recognised in profit or loss |  |  |  | 400,314 |  |
Cash advances and loans made to related parties |  | $ 7,056 | $ 42,394 | 22,322 |  |
San Faustin S.A. [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Proportion of ownership interest in associate |  | 60.45% |  |  |  |
Usiminas [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Fair value of investments in associates for which there are quoted market prices |  |  |  |  |  | 123,000
Total investments in subsidiaries, joint ventures and associates |  |  |  |  |  | $ 70,600
Impairment loss recognised in profit or loss |  |  |  | $ 28,900 |  |
Usiminas [member] | Ordinary shares [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Closing price, per share | (per share) |  |  |  |  | R$ 10.83 | $ 3.27
Usiminas [member] | Preference shares [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Closing price, per share | (per share) |  |  |  |  | R$ 9.10 | 2.75
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 |  | 3.08% | 3.08% |  |  |
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 | $ / shares |  |  |  |  |  | $ 31.59
Fair value of investments in associates for which there are quoted market prices |  |  |  |  |  | $ 725,700
Total investments in subsidiaries, joint ventures and associates |  |  |  |  |  | $ 563,700
Discount rate applied to cash flow projections |  |  |  |  |  | 11.50%
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 |  |  |  |  |  | $ 58,200
Provision for exposure to purchase and other service agreements |  |  |  |  |  | $ 3,900
Proportion of corporate guarantee covering obligations |  |  |  |  |  | 22.00%
Amount of loan partially guaranteed |  |  |  |  |  | $ 720,000
Provision of partial guarantee or collateral by entity |  |  |  |  |  | 158,400
Cash advances and loans made to related parties |  | $ 7,000 |  |  |  |
Techgen s.a. [member] | Subsidiary loans [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Loans and receivables |  |  |  |  |  | $ 93,200
Techgen s.a. [member] | San Faustin 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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