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Note 13 - Investments in Non-consolidated Companies - Summary of Selected Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Non-current assets | $ 9,428,517 | $ 9,172,384 |  |
Current assets | 4,287,672 | 5,670,607 |  |
Total assets | 13,716,189 | 14,842,991 | $ 14,251,299 |
Non-current liabilities | 1,103,241 | 876,162 |  |
Current liabilities | 1,166,475 | 1,780,457 |  |
Total liabilities | 2,269,716 | 2,656,619 |  |
Equity | 11,446,473 | 12,186,372 | 11,875,492 | $ 11,588,988
Non-controlling interests | 183,585 | 197,414 |  |
Revenues | 5,146,734 | 7,294,055 | 7,658,588 |
Gross profit | 1,059,417 | 2,186,560 | 2,379,288 |
Net income for the year attributable to owners of the parent | (634,418) | 742,686 | 876,063 |
Total comprehensive income for the year, net of tax, attributable to owners of the parent | (643,435) | 690,095 | $ 776,713 |
Ternium S.A. [member] |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Non-current assets | 8,289,460 | 8,757,320 |  |
Current assets | 4,566,775 | 4,178,213 |  |
Total assets | 12,856,235 | 12,935,533 |  |
Non-current liabilities | 2,559,485 | 3,452,535 |  |
Current liabilities | 1,853,597 | 1,768,125 |  |
Total liabilities | 4,413,082 | 5,220,660 |  |
Equity | 8,443,153 | 7,714,873 |  |
Revenues | 8,735,435 | 10,192,818 |  |
Gross profit | 1,635,512 | 1,740,378 |  |
Net income for the year attributable to owners of the parent | 778,468 | 564,269 |  |
Total comprehensive income for the year, net of tax, attributable to owners of the parent | 666,667 | 445,473 |  |
Usiminas [member] |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |
Non-current assets | 3,487,317 | 4,335,662 |  |
Current assets | 2,276,368 | 2,198,449 |  |
Total assets | 5,763,685 | 6,534,111 |  |
Non-current liabilities | 1,661,605 | 1,955,395 |  |
Current liabilities | 861,912 | 716,930 |  |
Total liabilities | 2,523,517 | 2,672,325 |  |
Equity | 3,240,168 | 3,861,786 |  |
Revenues | 3,132,949 | 3,790,206 |  |
Gross profit | 624,199 | 478,141 |  |
Net income for the year attributable to owners of the parent | $ 106,361 | $ 52,779 |  |

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