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Note 10 - Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of reconciliation of changes in intangible assets and goodwill [text block]
Year ended December 31, 2019   Information
system projects		   Licenses,
patents and
trademarks (*)		   Goodwill   Customer
relationships		   Total
                     
Cost                                        
Values at the beginning of the year    
580,622
      
464,571
      
2,085,936
      
2,058,859
      
5,189,988
  
Translation differences    
(1,917
 )    
(70
 )    
(968
 )    
-
      
(2,955
 )
Increase due to business combinations (**)    
405
      
-
      
32,869
      
81,192
      
114,466
  
Additions    
35,487
      
772
      
-
      
-
      
36,259
  
Transfers / Reclassifications    
(4,665
 )    
-
      
-
      
-
      
(4,665
 )
Disposals    
(5,062
 )    
(1,531
 )    
-
      
-
      
(6,593
 )
Values at the end of the year    
604,870
      
463,742
      
2,117,837
      
2,140,051
      
5,326,500
  
                                         
Amortization                                        
Accumulated at the beginning of the year    
513,984
      
373,466
      
797,592
      
2,038,981
      
3,724,023
  
Translation differences    
(1,734
 )    
-
      
-
      
-
      
(1,734
 )
Amortization charge    
28,937
      
719
      
-
      
18,259
      
47,915
  
Disposals    
(4,850
 )    
(413
 )    
-
      
-
      
(5,263
 )
Accumulated at the end of the year    
536,337
      
373,772
      
797,592
      
2,057,240
      
3,764,941
  
At December 31, 2019    
68,533
      
89,970
      
1,320,245
      
82,811
      
1,561,559
  
Year ended December 31, 2018   Information
system projects		   Licenses,
patents and
trademarks (*)		   Goodwill   Customer
relationships		   Total
Cost                                        
Values at the beginning of the year    
560,692
      
465,963
      
2,090,073
      
2,058,859
      
5,175,587
  
Translation differences    
(6,153
 )    
(183
 )    
(4,137
 )    
-
      
(10,473
 )
Additions    
31,632
      
273
      
-
      
-
      
31,905
  
Transfers / Reclassifications    
(5,493
 )    
-
      
-
      
-
      
(5,493
 )
Disposals    
(56
 )    
(1,482
 )    
-
      
-
      
(1,538
 )
Values at the end of the year    
580,622
      
464,571
      
2,085,936
      
2,058,859
      
5,189,988
  
                                         
Amortization                                        
Accumulated at the beginning of the year    
478,946
      
372,746
      
797,592
      
1,865,444
      
3,514,728
  
Translation differences    
(5,551
 )    
-
      
-
      
-
      
(5,551
 )
Amortization charge    
40,635
      
720
      
-
      
173,537
      
214,892
  
Disposals    
(46
 )    
-
      
-
      
-
      
(46
 )
Accumulated at the end of the year    
513,984
      
373,466
      
797,592
      
2,038,981
      
3,724,023
  
At December 31, 2018    
66,638
      
91,105
      
1,288,344
      
19,878
      
1,465,965
  
Disclosure of information for cash-generating units [text block]
(All amounts in million US dollar)                
As of December 31, 2019   Tubes Segment   Other Segment    
CGU   Maverick
Acquisition		   Hydril
Acquisition		   Other   Maverick
Acquisition		   Total
OCTG (USA)    
225
      
-
      
-
      
-
      
225
  
Tamsa (Hydril and other)    
-
      
346
      
19
      
-
      
365
  
Siderca (Hydril and other)    
-
      
265
      
93
      
-
      
358
  
Hydril    
-
      
309
      
-
      
-
      
309
  
Confab    
-
      
-
      
-
      
-
      
-
  
Coiled Tubing    
-
      
-
      
-
      
4
      
4
  
Other    
-
      
-
      
59
      
-
      
59
  
Total    
225
      
920
      
171
      
4
      
1,320