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Note 12 - Investments in Non-consolidated Companies - Summary of Selected Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |
Non-current assets | $ 9,017,064 | $ 9,034,704 |
Current assets | 5,381,154 | 4,817,154 |
Total assets | 14,398,218 | 14,003,275 |
Non-current liabilities | 746,349 | 859,073 |
Current liabilities | 2,070,899 | 1,713,036 |
Total liabilities | 2,817,248 | 2,590,203 |
Non-controlling interests | 98,785 | 125,655 |
Revenues | 5,288,504 | 4,293,592 | $ 6,903,123
Gross profit | 1,603,447 | 1,127,908 | 2,155,363
Net income for the year attributable to owners of the parent | 544,737 | 55,298 | (80,162)
Total comprehensive income for the year, net of tax, attributable to owners of the parent | 683,531 | 81,702 | $ (410,187)
Ternium s.a. [member] |  |  |
Statement Line Items [Line Items] |  |  |
Non-current assets | 7,727,283 | 5,622,556 |
Current assets | 4,395,283 | 2,700,314 |
Total assets | 12,122,566 | 8,322,870 |
Non-current liabilities | 3,442,521 | 1,324,785 |
Current liabilities | 2,827,275 | 1,831,492 |
Total liabilities | 6,269,796 | 3,156,277 |
Non-controlling interests | 842,347 | 775,295 |
Revenues | 9,700,296 | 7,223,975 |
Gross profit | 2,297,271 | 1,839,585 |
Net income for the year attributable to owners of the parent | 886,219 | 595,644 |
Total comprehensive income for the year, net of tax, attributable to owners of the parent | 815,434 | 534,827 |
Usiminas [member] |  |  |
Statement Line Items [Line Items] |  |  |
Non-current assets | 5,661,947 | 6,085,811 |
Current assets | 2,193,096 | 1,970,015 |
Total assets | 7,855,043 | 8,055,826 |
Non-current liabilities | 2,344,042 | 2,856,883 |
Current liabilities | 920,924 | 537,646 |
Total liabilities | 3,264,966 | 3,394,529 |
Non-controlling interests | 425,988 | 508,083 |
Revenues | 3,367,937 | 2,442,596 |
Gross profit | 513,712 | 150,999 |
Net income for the year attributable to owners of the parent | $ 99,853 | $ (166,153) |

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