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Note 26 - Cash Flow Disclosures
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of cash flow statement [text block]
26
 Cash flow disclosures
        Year ended December 31,
(i)     Changes in working capital   2018   2017   2016
      Inventories    
(176,443
 )    
(804,415
 )    
244,720
  
      Receivables and prepayments and Current tax assets    
30,144
      
(4,564
 )    
53,639
  
      Trade receivables    
(517,579
 )    
(259,375
 )    
146,824
  
      Other liabilities    
(22,984
 )    
4,226
      
(79,046
 )
      Customer advances    
5,976
      
17,039
      
(95,112
 )
      Trade payables    
(57,066
 )    
193,905
      
59,939
  
           
(737,952
 )    
(853,184
 )    
330,964
  
(ii)
     Income tax accruals less payments                        
      Tax accrued    
229,207
      
(17,136
 )    
41,441
  
      Taxes paid    
(170,713
 )    
(176,853
 )    
(169,520
 )
           
58,494
      
(193,989
 )    
(128,079
 )
(iii)
     Interest accruals less payments, net                        
      Interest accrued    
(2,914
 )    
(20,534
 )    
(43,872
 )
      Interest received    
40,613
      
50,001
      
60,163
  
      Interest paid    
(31,548
 )    
(17,917
 )    
(18,858
 )
           
6,151
      
11,550
      
(2,567
 )
(iv)
     Cash and cash equivalents                        
      Cash at banks, liquidity funds and short - term investments    
428,361
      
330,221
      
399,900
  
      Bank overdrafts    
(1,644
 )    
(131
 )    
(1,320
 )
           
426,717
      
330,090
      
398,580