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Note 1 - Segment Information - Tubes Segment Revenues By Market (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
Tubes [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales 4,844,000 6,870,000 7,233,000
Tubes [member] | Oil and gas [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales 4,073,000 5,757,000 6,042,000
Tubes [member] | Hydrocarbon processing and power generation [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales 371,000 534,000 602,000
Tubes [member] | Industrial and other [member]      
Disclosure of operating segments [line items]      
IFRS - Net Sales $ 400,000 $ 579,000 $ 589,000