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Note 1 - Segment Information - Reportable Operating Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
IFRS - Net Sales $ 5,146,734 $ 7,294,055 $ 7,658,588
Operating (loss) income (663,071) 832,391 871,813
Income (loss) before equity in earnings of non-consolidated companies and income tax (728,066) 851,674 909,113
Equity in earnings of non-consolidated companies 108,799 82,036 193,994
(Loss) income before income tax (619,267) 933,710 1,103,107
Capital expenditures 193,322 350,174 349,473
Depreciation and amortization 678,806 539,521 664,357
Tubes [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales 4,844,000 6,870,000 7,233,000
Management view - operating income (loss) (277,000) 857,000 702,000
Difference in cost of sales (138,000) (105,000) 112,000
Differences in depreciation and amortization 1,000 (1,000) (34,000)
Differences in selling, general and administrative expenses (2,000) (1,000) (2,000)
Differences in other operating income (expenses), net (200,000) 6,000  
Operating (loss) income (616,000) 756,000 778,000
Capital expenditures 189,000 338,000 346,000
Depreciation and amortization 661,000 523,000 645,000
All other segments [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales 303,000 424,000 426,000
Management view - operating income (loss) (50,000) 73,000 81,000
Difference in cost of sales 4,000 3,000 7,000
Differences in depreciation and amortization (1,000)
Differences in selling, general and administrative expenses 1,000 6,000
Differences in other operating income (expenses), net  
Operating (loss) income (47,000) 77,000 94,000
Capital expenditures 4,000 12,000 3,000
Depreciation and amortization 18,000 17,000 19,000
Reportable segments [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales 5,147,000 7,294,000 7,659,000
Management view - operating income (loss) (327,000) 930,000 783,000
Difference in cost of sales (134,000) (102,000) 119,000
Differences in depreciation and amortization (1,000) (34,000)
Differences in selling, general and administrative expenses (2,000) 4,000
Differences in other operating income (expenses), net (200,000) 6,000  
Operating (loss) income (663,000) 833,000 872,000
Financial income (expense), net (65,000) 19,000 37,000
Income (loss) before equity in earnings of non-consolidated companies and income tax (728,000) 852,000 909,000
Equity in earnings of non-consolidated companies 109,000 82,000 194,000
(Loss) income before income tax (619,000) 934,000 1,103,000
Capital expenditures 193,000 350,000 349,000
Depreciation and amortization $ 679,000 $ 540,000 $ 664,000