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Note 31 - Fees Paid to the Company's Principal Accountant (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of auditor's remuneration [text block]
(all amounts in thousands of U.S. dollars)   Year ended December 31,
    2018   2017   2016
Audit fees    
3,841
      
3,995
      
3,588
  
Audit-related fees    
43
      
88
      
64
  
Tax fees    
-
      
23
      
14
  
All other fees    
7
      
30
      
3
  
Total    
3,891
      
4,136
      
3,669