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Note 1 - Segment Information - Reportable Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
IFRS - Net Sales $ 7,294,055 $ 7,658,588 $ 5,288,504
IFRS - operating income 832,391 871,813 334,588
Financial income (expense), net 19,283 37,300 (23,017)
Income before equity in earnings of non-consolidated companies and income tax 851,674 909,113 311,571
Equity in earnings of non-consolidated companies 82,036 193,994 116,140
Income before income tax 933,710 1,103,107 427,711
Capital expenditures 350,174 349,473 558,236
Depreciation and amortization 539,521 664,357 608,640
Discontinued operations [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 11,899
Capital expenditures 145
Depreciation and amortization
Tubes [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 6,870,000 7,233,000 4,966,000
Management view - operating income 857,000 702,000 115,000
Difference in cost of sales (105,000) 112,000 164,000
Differences in depreciation and amortization (1,000) (34,000) (3,000)
Differences in selling, general and administrative expenses (1,000) (2,000) 14,000
Differences in other operating income (expenses), net 6,000   2,000
IFRS - operating income 755,000 777,000 292,000
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 338,000 346,000 550,000
Depreciation and amortization 523,000 645,000 594,000
All other segments [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 424,000 426,000 323,000
Management view - operating income 73,000 81,000 48,000
Difference in cost of sales 3,000 7,000 1,000
Differences in depreciation and amortization 0
Differences in selling, general and administrative expenses 1,000 6,000 (6,000)
Differences in other operating income (expenses), net  
IFRS - operating income 77,000 95,000 43,000
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 12,000 3,000 8,000
Depreciation and amortization 17,000 19,000 15,000
Reportable segments [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 7,294,000 7,659,000 5,289,000
Management view - operating income 929,000 783,000 163,000
Difference in cost of sales (102,000) 119,000 165,000
Differences in depreciation and amortization (1,000) (34,000) (3,000)
Differences in selling, general and administrative expenses 0 4,000 8,000
Differences in other operating income (expenses), net 6,000   2,000
IFRS - operating income 832,000 872,000 335,000
Financial income (expense), net 19,000 37,000 (23,000)
Income before equity in earnings of non-consolidated companies and income tax 852,000 909,000 312,000
Equity in earnings of non-consolidated companies 82,000 194,000 116,000
Income before income tax 934,000 1,103,000 428,000
Capital expenditures 350,000 349,000 558,000
Depreciation and amortization 540,000 664,000 609,000
Reportable segments [member] | Discontinued operations [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 12,000
Management view - operating income 3,000
Difference in cost of sales (1,000)
Differences in depreciation and amortization
Differences in selling, general and administrative expenses
Differences in other operating income (expenses), net  
IFRS - operating income 2,000
Financial income (expense), net
Income before equity in earnings of non-consolidated companies and income tax 2,000
Equity in earnings of non-consolidated companies
Income before income tax 2,000
Capital expenditures
Depreciation and amortization