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Note 32 - Fees Paid to the Company's Principal Accountant (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of auditor's remuneration [text block]
(all amounts in thousands of U.S. dollars)   Year ended December 31,
    2017   2016   2015
Audit fees    
3,995
      
3,588
      
4,372
  
Audit-related fees    
88
      
64
      
78
  
Tax fees    
23
      
14
      
25
  
All other fees    
30
      
3
      
15
  
Total    
4,136
      
3,669
      
4,490