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Note 19 - Borrowings - Significant Borrowings as of Closing Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Significant borrowings as of Closing Date $ 965,859 $ 840,236
Tamsa (Hydril and other) [member] | Significant borrowings as of closing date [member]    
Statement Line Items [Line Items]    
Significant borrowings as of Closing Date 404,000  
SIDERCA S.A.I.C. and subsidiaries [member] | Significant borrowings as of closing date [member]    
Statement Line Items [Line Items]    
Significant borrowings as of Closing Date 311,000  
TENARIS TUBOCARIBE LTDA. [member] | Significant borrowings as of closing date [member]    
Statement Line Items [Line Items]    
Significant borrowings as of Closing Date $ 150,000