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Note 18 - Borrowings - Significant Borrowings as of Closing Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 539,007 $ 965,859
Significant borrowings as of closing date [member] | Tamsa (Hydril and other) [member]    
Statement Line Items [Line Items]    
Significant borrowings as of closing date 347,000  
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 66,000  
Significant borrowings as of closing date [member] | TENARIS TUBOCARIBE LTDA. [member]    
Statement Line Items [Line Items]    
Significant borrowings as of closing date $ 50,000