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Note 12 - Investments in Non-consolidated Companies (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of detailed information about investments in non-consolidated companies [text block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2016 |
At the beginning of the year |  |  | 557,031 |  |  |  | 490,645 |
Translation differences |  |  | (9,548 | ) |  |  | 3,473 |
Equity in earnings of non-consolidated companies |  |  | 116,140 |  |  |  | 71,533 |
Dividends and distributions received (*) |  |  | (22,971 | ) |  |  | (20,674 | )
Additions |  |  | - |  |  |  | 17,108 |
Decrease / increase in equity reserves and others |  |  | (358 | ) |  |  | (5,054 | )
At the end of the year |  |  | 640,294 |  |  |  | 557,031 |
Disclosure of detailed information about principal non-consolidated companies [text block] |
|  |  |  | % ownership at December 31, |  |  | Value at December 31, |
Company |  | Country of incorporation |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
a) Ternium (*) |  | Luxembourg |  |  | 11.46 | % |  |  | 11.46 | % |  |  | 563,735 |  |  |  | 491,285 |
b) Usiminas (**) |  | Brazil |  |  | 3.08 | % |  |  | 3.08 | % |  |  | 70,642 |  |  |  | 61,904 |
Others |  | - |  |  | - |  |  |  | - |  |  |  | 5,917 |  |  |  | 3,842 |
|  |  |  |  |  |  |  |  |  |  |  |  | 640,294 |  |  |  | 557,031 |
Disclosure of detailed information about selected financial information [text block] |
|  | Ternium |
|  | 2017 |  |  | 2016 |
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 |
|  | 2017 |  |  | 2016 |
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 (loss) for the year attributable to owners of the parent |  |  | 99,853 |  |  |  | (166,153 | )

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