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Note 1 - Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of operating segments [text block]
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
  
Year Ended December 31, 2015   Tubes     Other     Continuing operations     Discontinued operations  
IFRS - Net Sales    
6,444
      
459
      
6,903
      
198
  
Management view - operating income    
686
      
27
      
713
      
39
  
Difference in cost of sales    
(225
 )    
-
      
(225
 )    
(9
 )
Direct cost and others    
(184
 )    
-
      
(184
 )    
(9
 )
Absorption    
(41
 )    
-
      
(41
 )    
-
  
Differences in Depreciation and Amortization    
(319
 )    
1
      
(318
 )    
-
  
Differences in Selling, general and administrative expenses    
(4
 )    
-
      
(4
 )    
-
  
Differences in Other operating income (expenses), net    
-
      
-
      
-
      
-
  
IFRS - operating income    
138
      
28
      
166
      
30
  
Financial income (expense), net    
 
      
 
      
15
      
-
  
Income before equity in earnings of non-consolidated companies and income tax    
 
      
 
      
181
      
30
  
Equity in losses of non-consolidated companies    
 
      
 
      
(40
 )    
-
  
Income before income tax    
 
      
 
      
141
      
30
  
Capital expenditures    
1,089
      
41
      
1,130
      
1
  
Depreciation and amortization    
638
      
15
      
653
      
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, 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    
430,143
      
58,949
      
57,285
      
7,562
      
4,153
      
-
      
558,092
      
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
  
                                                                 
Year ended December 31, 2015                                                                
Net sales    
2,668,724
      
2,132,221
      
728,815
      
1,096,688
      
276,675
      
-
      
6,903,123
      
197,630
  
Total assets    
8,625,806
      
2,931,297
      
1,877,429
      
429,317
      
423,479
      
512,217
      
14,799,545
      
87,429
  
Trade receivables    
339,499
      
396,834
      
181,084
      
137,278
      
52,494
      
-
      
1,107,189
      
27,940
  
Property, plant and equipment, net    
3,207,661
      
1,269,995
      
907,466
      
86,181
      
155,299
      
-
      
5,626,602
      
45,656
  
Capital expenditures    
822,396
      
168,140
      
82,344
      
36,867
      
20,566
      
-
      
1,130,313
      
1,206
  
Depreciation and amortization    
385,189
      
125,754
      
112,742
      
9,912
      
19,716
      
-
      
653,313
      
5,465