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Note 28 - Cash Flow Disclosures (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of detailed information about cash flow disclosures [text block]
        Year ended December 31,
(i)   Changes in working capital   2019   2018   2017
      Inventories    
311,459
      
(176,443
 )    
(804,415
 )
      Receivables and prepayments and Current tax assets    
(34,368
 )    
30,144
      
(4,564
 )
      Trade receivables    
428,326
      
(517,579
 )    
(259,375
 )
      Other liabilities    
(18,295
 )    
(22,984
 )    
4,226
  
      Customer advances    
16,844
      
5,976
      
17,039
  
      Trade payables    
(180,857
 )    
(57,066
 )    
193,905
  
           
523,109
      
(737,952
 )    
(853,184
 )
(ii)
     Income tax accruals less payments                        
      Tax accrued    
202,452
      
229,207
      
(17,136
 )
      Taxes paid    
(395,869
 )    
(170,713
 )    
(176,853
 )
           
(193,417
 )    
58,494
      
(193,989
 )
(iii)
     Interest accruals less payments, net                        
      Interest accrued    
(4,616
 )    
(2,914
 )    
(20,534
 )
      Interest received    
30,890
      
40,613
      
50,001
  
      Interest paid    
(30,655
 )    
(31,548
 )    
(17,917
 )
           
(4,381
 )    
6,151
      
11,550
  
(iv)
     Cash and cash equivalents                        
      Cash at banks, liquidity funds and short - term investments    
1,554,299
      
428,361
      
330,221
  
      Bank overdrafts    
(24
 )    
(1,644
 )    
(131
 )
           
1,554,275
      
426,717
      
330,090