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Note 17 - Cash and Cash Equivalents and Other Investments
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of cash and cash equivalents and other investments [text block]
17
Cash and cash equivalents and Other investments
    Year ended December 31,
    2018   2017
Cash and cash equivalents                
Cash at banks    
81,211
      
150,948
  
Liquidity funds    
160,198
      
66,033
  
Short – term investments    
186,952
      
113,240
  
     
428,361
      
330,221
  
Other investments - current                
Fixed Income (time-deposit, zero coupon bonds, commercial papers)    
300,410
      
437,406
  
Bonds and other fixed Income    
187,324
      
754,800
  
Others    
-
      
100
  
     
487,734
      
1,192,306
  
Other investments - Non-current                
Bonds and other fixed Income    
113,829
      
123,498
  
Others    
4,326
      
4,837
  
     
118,155
      
128,335