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Note 19 - Borrowings - Significant Borrowings as of Closing Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 822,152 $ 539,007
Significant borrowings as of closing date [member] | Tamsa (Hydril and other) [member]    
Statement Line Items [Line Items]    
Significant borrowings as of closing date 621,000  
Significant borrowings as of closing date [member] | SIDERCA S.A.I.C. and subsidiaries [member]    
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 60,000