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Note 5 - Other Operating Income and Expenses (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of detailed information about other operating income and expenses [text block]
    Year ended December 31,  
(all amounts in thousands of U.S. dollars)   2017     2016     2015  
             
Other operating income                        
Net income from other sales    
4,395
      
16,275
      
7,480
  
Net rents    
4,325
      
4,852
      
6,462
  
Other    
1,796
      
-
      
661
  
     
10,516
      
21,127
      
14,603
  
                         
Other operating expenses                        
Contributions to welfare projects and non-profits organizations    
9,158
      
9,534
      
9,052
  
Provisions for legal claims and contingencies    
-
      
10
      
1
  
Loss on fixed assets and material supplies disposed / scrapped    
118
      
57
      
94
  
Impairment charge    
-
      
-
      
400,314
  
Allowance for doubtful receivables    
84
      
432
      
1,114
  
Other    
-
      
1,378
      
-
  
     
9,360
      
11,411
      
410,575
  
From discontinued operations    
(1
 )    
(248
 )    
(1
 )
     
9,359
      
11,163
      
410,574