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Note 1 - Segment Information - Reportable Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
IFRS - Net Sales $ 7,658,588 $ 5,288,504 $ 4,293,592
IFRS - operating income 871,813 334,588 (59,057)
Financial income (expense), net 37,300 (23,017) 21,954
Income before equity in earnings of non-consolidated companies and income tax 909,113 311,571 (37,103)
Equity in earnings of non-consolidated companies 193,994 116,140 71,533
Income before income tax 1,103,107 427,711 34,430
Capital expenditures 349,473 558,236 786,873
Discontinued operations [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 11,899 234,911
Capital expenditures 145 1,911
Depreciation and amortization 5,303
Tubes [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 7,233,000 4,966,000 4,015,000
Management view - operating income 702,000 115,000 19,000
Difference in cost of sales 112,000 164,000 (108,000)
Direct cost and others 127,000 115,000 (114,000)
Absorption (15,000) 49,000 6,000
Differences in depreciation and amortization (34,000) (3,000) 28,000
Differences in selling, general and administrative expenses (2,000) 14,000 (5,000)
Differences in other operating income (expenses), net 2,000 (5,000)
IFRS - operating income 777,000 292,000 (71,000)
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 346,000 550,000 752,000
Depreciation and amortization 645,000 594,000 643,000
All other segments [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 426,000 323,000 278,000
Management view - operating income 81,000 48,000 19,000
Difference in cost of sales 7,000 1,000 (8,000)
Direct cost and others 6,000 (8,000)
Absorption 1,000 1,000
Differences in depreciation and amortization 0
Differences in selling, general and administrative expenses 6,000 (6,000) 1,000
Differences in other operating income (expenses), net
IFRS - operating income 95,000 43,000 12,000
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 3,000 8,000 33,000
Depreciation and amortization 19,000 15,000 14,000
Reportable segments [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 7,659,000 5,289,000 4,294,000
Management view - operating income 783,000 163,000 38,000
Difference in cost of sales 119,000 165,000 (116,000)
Direct cost and others 133,000 115,000 (122,000)
Absorption (14,000) 50,000 6,000
Differences in depreciation and amortization (34,000) (3,000) 28,000
Differences in selling, general and administrative expenses 4,000 8,000 (4,000)
Differences in other operating income (expenses), net 2,000 (5,000)
IFRS - operating income 872,000 335,000 (59,000)
Financial income (expense), net 37,000 (23,000) 22,000
Income before equity in earnings of non-consolidated companies and income tax 909,000 312,000 (37,000)
Equity in earnings of non-consolidated companies 194,000 116,000 71,000
Income before income tax 1,103,000 428,000 34,000
Capital expenditures 349,000 558,000 785,000
Depreciation and amortization 664,000 609,000 657,000
Reportable segments [member] | Discontinued operations [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 12,000 235,000
Management view - operating income 3,000 62,000
Difference in cost of sales (1,000) 4,000
Direct cost and others (1,000) 4,000
Absorption
Differences in depreciation and amortization
Differences in selling, general and administrative expenses
Differences in other operating income (expenses), net
IFRS - operating income 2,000 66,000
Financial income (expense), net
Income before equity in earnings of non-consolidated companies and income tax 2,000 66,000
Equity in earnings of non-consolidated companies
Income before income tax 2,000 66,000
Capital expenditures 2,000
Depreciation and amortization $ 5,000