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Note 1 - Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement Line Items [Line Items] |
Disclosure of operating segments [text block] |
Year ended December 31, 2018 |  | Tubes |  |  | Other |  |  | Continuing operations |  |  | Discontinued operations |
IFRS - Net Sales |  |  | 7,233 |  |  |  | 426 |  |  |  | 7,659 |  |  |  | - |
Management view - operating income |  |  | 702 |  |  |  | 81 |  |  |  | 783 |  |  |  | - |
Difference in cost of sales |  |  | 112 |  |  |  | 7 |  |  |  | 119 |  |  |  | - |
Direct cost and others |  |  | 127 |  |  |  | 6 |  |  |  | 133 |  |  |  | - |
Absorption |  |  | (15 | ) |  |  | 1 |  |  |  | (14 | ) |  |  | - |
Differences in depreciation and amortization |  |  | (34 | ) |  |  | 0 |  |  |  | (34 | ) |  |  | - |
Differences in selling, general and administrative expenses |  |  | (2 | ) |  |  | 6 |  |  |  | 4 |  |  |  | - |
Differences in other operating income (expenses), net |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
IFRS - operating income |  |  | 777 |  |  |  | 95 |  |  |  | 872 |  |  |  | - |
Financial income (expense), net |  |  |  |  |  |  |  |  |  |  | 37 |  |  |  | - |
Income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  |  |  |  |  | 909 |  |  |  | - |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  |  |  |  |  | 194 |  |  |  | - |
Income before income tax |  |  |  |  |  |  |  |  |  |  | 1,103 |  |  |  | - |
Capital expenditures |  |  | 346 |  |  |  | 3 |  |  |  | 349 |  |  |  | - |
Depreciation and amortization |  |  | 645 |  |  |  | 19 |  |  |  | 664 |  |  |  | - |
Year ended December 31, 2017 |  | Tubes |  |  | Other |  |  | Continuing operations |  |  | Discontinued operations |
IFRS - Net Sales |  |  | 4,966 |  |  |  | 323 |  |  |  | 5,289 |  |  |  | 12 |
Management view - operating income |  |  | 115 |  |  |  | 48 |  |  |  | 163 |  |  |  | 3 |
Difference in cost of sales |  |  | 164 |  |  |  | 1 |  |  |  | 165 |  |  |  | (1 | )
Direct cost and others |  |  | 115 |  |  |  | - |  |  |  | 115 |  |  |  | (1 | )
Absorption |  |  | 49 |  |  |  | 1 |  |  |  | 50 |  |  |  | - |
Differences in depreciation and amortization |  |  | (3 | ) |  |  | - |  |  |  | (3 | ) |  |  | - |
Differences in selling, general and administrative expenses |  |  | 14 |  |  |  | (6 | ) |  |  | 8 |  |  |  | - |
Differences in other operating income (expenses), net |  |  | 2 |  |  |  | - |  |  |  | 2 |  |  |  | - |
IFRS - operating income |  |  | 292 |  |  |  | 43 |  |  |  | 335 |  |  |  | 2 |
Financial income (expense), net |  |  |  |  |  |  |  |  |  |  | (23 | ) |  |  | - |
Income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  |  |  |  |  | 312 |  |  |  | 2 |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  |  |  |  |  | 116 |  |  |  | - |
Income before income tax |  |  |  |  |  |  |  |  |  |  | 428 |  |  |  | 2 |
Capital expenditures |  |  | 550 |  |  |  | 8 |  |  |  | 558 |  |  |  | - |
Depreciation and amortization |  |  | 594 |  |  |  | 15 |  |  |  | 609 |  |  |  | - |
Year Ended December 31, 2016 |  | Tubes |  |  | Other |  |  | Continuing operations |  |  | Discontinued operations |
IFRS - Net Sales |  |  | 4,015 |  |  |  | 278 |  |  |  | 4,294 |  |  |  | 235 |
Management view - operating income |  |  | 19 |  |  |  | 19 |  |  |  | 38 |  |  |  | 62 |
Difference in cost of sales |  |  | (108 | ) |  |  | (8 | ) |  |  | (116 | ) |  |  | 4 |
Direct cost and others |  |  | (114 | ) |  |  | (8 | ) |  |  | (122 | ) |  |  | 4 |
Absorption |  |  | 6 |  |  |  | - |  |  |  | 6 |  |  |  | - |
Differences in depreciation and amortization |  |  | 28 |  |  |  | - |  |  |  | 28 |  |  |  | - |
Differences in selling, general and administrative expenses |  |  | (5 | ) |  |  | 1 |  |  |  | (4 | ) |  |  | - |
Differences in other operating income (expenses), net |  |  | (5 | ) |  |  | - |  |  |  | (5 | ) |  |  | - |
IFRS - operating (loss) income |  |  | (71 | ) |  |  | 12 |  |  |  | (59 | ) |  |  | 66 |
Financial income (expense), net |  |  |  |  |  |  |  |  |  |  | 22 |  |  |  | - |
(Loss) income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  |  |  |  |  | (37 | ) |  |  | 66 |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  |  |  |  |  | 71 |  |  |  | - |
Income before income tax |  |  |  |  |  |  |  |  |  |  | 34 |  |  |  | 66 |
Capital expenditures |  |  | 752 |  |  |  | 33 |  |  |  | 785 |  |  |  | 2 |
Depreciation and amortization |  |  | 643 |  |  |  | 14 |  |  |  | 657 |  |  |  | 5 |
Disclosure of geographical areas [text block] |
(all amounts in thousands of U.S. dollars) |  | North America |  |  | South America |  |  | Europe |  |  | Middle East & Africa |  |  | Asia Pacific |  |  | Unallocated (*) |  |  | Total continuing operations |  |  | Total discontinued operations |
Year ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 3,611,509 |  |  |  | 1,462,044 |  |  |  | 724,733 |  |  |  | 1,559,988 |  |  |  | 300,314 |  |  |  | - |  |  |  | 7,658,588 |  |  |  | - |
Total assets |  |  | 7,971,311 |  |  |  | 2,489,522 |  |  |  | 1,913,589 |  |  |  | 588,746 |  |  |  | 482,563 |  |  |  | 805,568 |  |  |  | 14,251,299 |  |  |  | - |
Trade receivables |  |  | 791,190 |  |  |  | 280,801 |  |  |  | 215,202 |  |  |  | 383,358 |  |  |  | 66,815 |  |  |  | - |  |  |  | 1,737,366 |  |  |  | - |
Property, plant and equipment, net |  |  | 3,859,060 |  |  |  | 1,133,113 |  |  |  | 848,178 |  |  |  | 94,040 |  |  |  | 129,517 |  |  |  | - |  |  |  | 6,063,908 |  |  |  | - |
Capital expenditures |  |  | 196,220 |  |  |  | 68,603 |  |  |  | 77,467 |  |  |  | 2,047 |  |  |  | 5,136 |  |  |  | - |  |  |  | 349,473 |  |  |  | - |
Depreciation and amortization |  |  | 441,705 |  |  |  | 108,558 |  |  |  | 82,769 |  |  |  | 10,389 |  |  |  | 20,936 |  |  |  | - |  |  |  | 664,357 |  |  |  | - |
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 2,451,357 |  |  |  | 1,142,142 |  |  |  | 545,777 |  |  |  | 937,439 |  |  |  | 211,789 |  |  |  | - |  |  |  | 5,288,504 |  |  |  | 11,899 |
Total assets |  |  | 7,925,520 |  |  |  | 2,975,599 |  |  |  | 2,002,658 |  |  |  | 391,029 |  |  |  | 441,546 |  |  |  | 661,866 |  |  |  | 14,398,218 |  |  |  | - |
Trade receivables |  |  | 582,204 |  |  |  | 234,877 |  |  |  | 214,944 |  |  |  | 135,524 |  |  |  | 46,511 |  |  |  | - |  |  |  | 1,214,060 |  |  |  | - |
Property, plant and equipment, net |  |  | 3,914,229 |  |  |  | 1,190,145 |  |  |  | 878,788 |  |  |  | 102,481 |  |  |  | 143,500 |  |  |  | - |  |  |  | 6,229,143 |  |  |  | - |
Capital expenditures |  |  | 430,142 |  |  |  | 58,949 |  |  |  | 57,285 |  |  |  | 7,562 |  |  |  | 4,153 |  |  |  | - |  |  |  | 558,091 |  |  |  | 145 |
Depreciation and amortization |  |  | 354,091 |  |  |  | 126,273 |  |  |  | 93,900 |  |  |  | 12,094 |  |  |  | 22,282 |  |  |  | - |  |  |  | 608,640 |  |  |  | - |
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 1,320,297 |  |  |  | 1,210,527 |  |  |  | 565,173 |  |  |  | 1,055,994 |  |  |  | 141,601 |  |  |  | - |  |  |  | 4,293,592 |  |  |  | 234,911 |
Total assets |  |  | 7,467,842 |  |  |  | 2,803,848 |  |  |  | 1,925,784 |  |  |  | 593,649 |  |  |  | 482,132 |  |  |  | 578,603 |  |  |  | 13,851,858 |  |  |  | 151,417 |
Trade receivables |  |  | 229,390 |  |  |  | 204,746 |  |  |  | 161,291 |  |  |  | 308,919 |  |  |  | 50,339 |  |  |  | - |  |  |  | 954,685 |  |  |  | 33,620 |
Property, plant and equipment, net |  |  | 3,652,032 |  |  |  | 1,237,391 |  |  |  | 847,318 |  |  |  | 106,941 |  |  |  | 158,257 |  |  |  | - |  |  |  | 6,001,939 |  |  |  | 41,470 |
Capital expenditures |  |  | 646,545 |  |  |  | 59,780 |  |  |  | 35,270 |  |  |  | 24,166 |  |  |  | 19,201 |  |  |  | - |  |  |  | 784,962 |  |  |  | 1,911 |
Depreciation and amortization |  |  | 381,811 |  |  |  | 128,458 |  |  |  | 113,875 |  |  |  | 11,053 |  |  |  | 21,912 |  |  |  | - |  |  |  | 657,109 |  |  |  | 5,303 |

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