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Note 1 - Segment Information | 12 Months Ended
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Dec. 31, 2018
Statement Line Items [Line Items] |
Disclosure of entity's operating segments [text block] |
1 | Segment information
As mentioned in section II. AP – C, the Segment Information is disclosed as follows: Reportable operating segments (All amounts in millions of U.S. dollars)
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 |
Transactions between segments, which were eliminated in consolidation, are mainly related to sales of scrap, energy, surplus raw materials and others from the Other segment to the Tubes segment for $52, $53 and $47 million in 2018, 2017 and 2016, respectively. In addition to the amounts reconciled above, the main differences in net income arise from the impact of functional currencies on financial result, deferred income taxes as well as the result of investment in non-consolidated companies and changes on the valuation of inventories according to cost estimation internally defined.
| 1 | Segment information (Cont.)
Geographical information
(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 |
There are no revenues from external customers attributable to the Company’s country of incorporation (Luxembourg). For geographical information purposes, “North America” comprises Canada, Mexico and the USA ( 33% ); “South America” comprises principally Argentina ( 13% ), Brazil and Colombia; “Europe” comprises principally Italy and Romania; “Middle East and Africa” comprises principally Egypt, Kazakhstan, Nigeria and Saudi Arabia and; “Asia Pacific” comprises principally China, Japan, Indonesia and Thailand. (*) For 2018 includes Investments in non-consolidated companies, for 2017 and 2016 includes Investments in non-consolidated companies and Other equity investments for $21.6 million (see Note 11 and 30 ). Revenue is mainly recognized at a point in time to direct customers, when control has been transferred and there is no unfulfilled performance obligation that could affect the acceptance of the product by the customer. Tenaris’s revenues related to governmental institutions represents aproximately 14% and 16% in 2018 and 2017 respectively. At December 2018, 2017 and 2016, the Company recognized contract liabilities related to customer advances in the amount of $ 62.7, 56.7 and 39.7 million, respectively. These amounts related to years 2017 and 2016 were reclassified to revenues during the subsequent year. In these periods, no significant adjustment in revenues were performed related to performance obligations previously satisfied.

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