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Note 27 - Cash Flow Disclosures
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of cash flow statement [text block]
27
 Cash flow disclosures
 
          Year ended December 31,  
(i)     Changes in working capital   2017     2016     2015  
        Inventories    
(804,415
 )    
244,720
      
936,402
  
        Receivables and prepayments and Current tax assets    
(6,662
 )    
70,874
      
60,009
  
        Trade receivables    
(259,375
 )    
146,824
      
828,265
  
        Other liabilities    
4,226
      
(79,046
 )    
(123,904
 )
        Customer advances    
17,039
      
(95,112
 )    
1,171
  
        Trade payables    
193,905
      
59,939
      
(327,958
 )
             
(855,282
 )    
348,199
      
1,373,985
  
 
(ii)
     Income tax accruals less payments                        
        Tax accrued    
(17,136
 )    
41,441
      
244,505
  
        Taxes paid    
(176,853
 )    
(169,520
 )    
(335,585
 )
             
(193,989
 )    
(128,079
 )    
(91,080
 )
 
(iii)
     Interest accruals less payments, net                        
        Interest accrued    
(20,534
 )    
(43,872
 )    
(11,517
 )
        Interest received    
50,001
      
60,163
      
56,835
  
        Interest paid    
(17,917
 )    
(18,858
 )    
(18,696
 )
             
11,550
      
(2,567
 )    
26,622
  
 
(iv)
     Cash and cash equivalents                        
        Cash at banks, liquidity funds and short - term investments    
330,221
      
399,900
      
286,547
  
        Bank overdrafts    
(131
 )    
(1,320
 )    
(349
 )
             
330,090
      
398,580
      
286,198