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Note 1 - Segment Information - Reportable Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
IFRS - Net Sales $ 5,288,504 $ 4,293,592 $ 6,903,123
IFRS - operating income 334,588 (59,057) 165,795
Financial income (expense), net (23,017) 21,954 14,592
Income before equity in earnings of non-consolidated companies and income tax 311,571 (37,103) 180,387
Equity in earnings of non-consolidated companies 116,140 71,533 (39,558)
Income before income tax 427,711 34,430 140,829
Capital expenditures 558,236 786,873 1,131,519
Equity in losses of non-consolidated companies 116,140 71,533 (39,558)
Discontinued operations [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 11,899 234,911 197,630
IFRS - operating income 2,454 65,838 29,633
Financial income (expense), net (9) (88) (382)
Capital expenditures 145 1,911 1,206
Depreciation and amortization 5,303 5,465
Tubes [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 4,966 4,015 6,444
Management view - operating income 115 19 686
Difference in cost of sales 164 (108) (225)
Direct cost and others 115 (114) (184)
Absorption 49 6 (41)
Differences in depreciation and amortization (3) 28 (319)
Differences in selling, general and administrative expenses 14 (5) (4)
Differences in other operating income (expenses), net 2 (5)
IFRS - operating income 292 (71) 138
Financial income (expense), net
Income before equity in earnings of non-consolidated companies and income tax
Equity in earnings of non-consolidated companies
Income before income tax
Capital expenditures 550 752 1,089
Depreciation and amortization 594 643 638
Equity in losses of non-consolidated companies
All other segments [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 323 278 459
Management view - operating income 48 19 27
Difference in cost of sales 1 (8)
Direct cost and others (8)
Absorption 1
Differences in depreciation and amortization 1
Differences in selling, general and administrative expenses (6) 1
Differences in other operating income (expenses), net
IFRS - operating income 43 12 28
Financial income (expense), net
Income before equity in earnings of non-consolidated companies and income tax
Equity in earnings of non-consolidated companies
Income before income tax
Capital expenditures 8 33 41
Depreciation and amortization 15 14 15
Equity in losses of non-consolidated companies
Reportable segments [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 5,289 4,294 6,903
Management view - operating income 163 38 713
Difference in cost of sales 165 (116) (225)
Direct cost and others 115 (122) (184)
Absorption 50 6 (41)
Differences in depreciation and amortization (3) 28 (318)
Differences in selling, general and administrative expenses 8 (4) (4)
Differences in other operating income (expenses), net 2 (5)
IFRS - operating income 335 (59) 166
Financial income (expense), net (23) 22 15
Income before equity in earnings of non-consolidated companies and income tax 312 (37) 181
Equity in earnings of non-consolidated companies 116 71 (40)
Income before income tax 428 34 141
Capital expenditures 558 785 1,130
Depreciation and amortization 609 657 653
Equity in losses of non-consolidated companies 116 71 (40)
Reportable segments [member] | Discontinued operations [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 12 235 198
Management view - operating income 3 62 39
Difference in cost of sales (1) 4 (9)
Direct cost and others (1) 4 (9)
Absorption
Differences in depreciation and amortization
Differences in selling, general and administrative expenses
Differences in other operating income (expenses), net
IFRS - operating income 2 66 30
Financial income (expense), net
Income before equity in earnings of non-consolidated companies and income tax 2 66 30
Equity in earnings of non-consolidated companies
Income before income tax 2 66 30
Capital expenditures 2 1
Depreciation and amortization 5 5
Equity in losses of non-consolidated companies