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Note 1 - Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of operating segments [text block] |
Year ended December 31, 2019 |  | Tubes |  |  | Other |  |  | Continuing operations |  |  | Discontinued operations |
IFRS - Net Sales |  |  | 6,870 |  |  |  | 424 |  |  |  | 7,294 |  |  |  | - |
Management view - operating income |  |  | 857 |  |  |  | 73 |  |  |  | 929 |  |  |  | - |
Difference in cost of sales |  |  | (105 | ) |  |  | 3 |  |  |  | (102 | ) |  |  | - |
Differences in depreciation and amortization |  |  | (1 | ) |  |  | (0 | ) |  |  | (1 | ) |  |  | - |
Differences in selling, general and administrative expenses |  |  | (1 | ) |  |  | 1 |  |  |  | (0 | ) |  |  | - |
Differences in other operating income (expenses), net |  |  | 6 |  |  |  | - |  |  |  | 6 |  |  |  | - |
IFRS - operating income |  |  | 755 |  |  |  | 77 |  |  |  | 832 |  |  |  | - |
Financial income (expense), net |  |  |  |  |  |  |  |  |  |  | 19 |  |  |  | - |
Income before equity in earnings of non-consolidated companies and income tax |  |  |  |  |  |  |  |  |  |  | 852 |  |  |  | - |
Equity in earnings of non-consolidated companies |  |  |  |  |  |  |  |  |  |  | 82 |  |  |  | - |
Income before income tax |  |  |  |  |  |  |  |  |  |  | 934 |  |  |  | - |
Capital expenditures |  |  | 338 |  |  |  | 12 |  |  |  | 350 |  |  |  | - |
Depreciation and amortization |  |  | 523 |  |  |  | 17 |  |  |  | 540 |  |  |  | - |
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 |  |  |  | - |
Differences in depreciation and amortization |  |  | (34 | ) |  |  | - |  |  |  | (34 | ) |  |  | - |
Differences in selling, general and administrative expenses |  |  | (2 | ) |  |  | 6 |  |  |  | 4 |  |  |  | - |
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 | )
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 |  |  |  | - |
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, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  | 3,429,911 |  |  |  | 1,391,288 |  |  |  | 738,880 |  |  |  | 1,382,172 |  |  |  | 351,804 |  |  |  | - |  |  |  | 7,294,055 |  |  |  | - |
Total assets |  |  | 7,885,120 |  |  |  | 2,227,044 |  |  |  | 2,282,775 |  |  |  | 958,424 |  |  |  | 609,663 |  |  |  | 879,965 |  |  |  | 14,842,991 |  |  |  | - |
Trade receivables |  |  | 612,809 |  |  |  | 176,173 |  |  |  | 149,321 |  |  |  | 319,406 |  |  |  | 90,451 |  |  |  | - |  |  |  | 1,348,160 |  |  |  | - |
Property, plant and equipment, net |  |  | 3,771,570 |  |  |  | 1,129,260 |  |  |  | 816,721 |  |  |  | 254,858 |  |  |  | 117,608 |  |  |  | - |  |  |  | 6,090,017 |  |  |  | - |
Capital expenditures |  |  | 169,390 |  |  |  | 113,999 |  |  |  | 55,169 |  |  |  | 4,578 |  |  |  | 7,038 |  |  |  | - |  |  |  | 350,174 |  |  |  | - |
Depreciation and amortization |  |  | 276,046 |  |  |  | 105,308 |  |  |  | 82,400 |  |  |  | 42,520 |  |  |  | 33,247 |  |  |  | - |  |  |  | 539,521 |  |  |  | - |
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 |  |  |  | - |
Tubes [member] |
Statement Line Items [Line Items] |
Segment revenues by market [text block] |
Revenues Tubes (in million US dollar) |  | 2019 |  |  | 2018 |  |  | 2017 |
Oil and Gas |  |  | 5,757 |  |  |  | 6,042 |  |  |  | 4,034 |
Hydrocarbon Processing and Power Generation |  |  | 534 |  |  |  | 602 |  |  |  | 484 |
Industrial and Other |  |  | 579 |  |  |  | 589 |  |  |  | 448 |
Total |  |  | 6,870 |  |  |  | 7,233 |  |  |  | 4,966 |

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