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Note 1 - Segment Information - Tubes Segment Revenues By Market (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
Tubes [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 6,870,000 7,233,000 4,966,000
Tubes [member] | Oil and gas [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 5,757,000 6,042,000 4,034,000
Tubes [member] | Hydrocarbon processing and power generation [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales 534,000 602,000 484,000
Tubes [member] | Industrial and other [member]      
Statement Line Items [Line Items]      
IFRS - Net Sales $ 579,000 $ 589,000 $ 448,000