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Note 24 - Share-based Payments (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block]
In R$, except when otherwise indicated   2017
(i)
   2016
(i)
   2015
(i)
                         
Fair value of options granted    
6.51
  
 
    
6.21
  
 
    
7.84
  
 
Share price    
19.80
  
 
    
17.18
  
 
    
18.41
  
 
Exercise price    
19.80
  
 
    
17.18
  
 
    
18.41
  
 
Expected volatility    
26.7
 %
 
    
27.0
 %
 
    
27.5
 %
 
Vesting year    
5
  
 
    
5
  
 
    
5
  
 
Expected dividends    
5
 %
 
    
5
 %
 
    
5
 %
 
Risk-free interest rate    
10.1
 %
(ii)
    
12.4
 %
(ii)
    
15.9
 %
(ii)
Disclosure of the number of share options [text block]
Thousand options   2017     2016     2015  
                   
Options outstanding at January 1
st
    
131,244
      
121,770
      
126,149
  
Options issued during the period    
20,435
      
24,806
      
16,568
  
Options exercised during the period    
(13,548
 )    
(11,613
 )    
(19,975
 )
Options forfeited during the period    
(2,910
 )    
(3,719
 )    
(972
 )
Options outstanding at ended year    
135,221
      
131,244
      
121,770
  
Disclosure of weighted average exercise prices of share options [text block]
In R$ per share   2017     2016     2015  
                   
Options outstanding at January 1
st
    
13.87
      
12.36
      
10.07
  
Options issued during the period    
19.82
      
17.18
      
18.42
  
Options forfeited during the period    
17.88
      
12.83
      
20.35
  
Options exercised during the period    
5.81
      
2.52
      
5.05
  
Options outstanding at ended period    
15.27
      
13.87
      
12.36
  
Options exercisable at ended period    
3.78
      
3.66
      
3.29
  
Disclosure of number and weighted average exercise prices of other equity instruments [text block]
Thousand deferred shares   2017     2016     2015  
                   
Deferred shares outstanding at January 1
st
    
19,260
      
19,056
      
17,490
  
New deferred shares during the period    
794
      
7,329
      
2,692
  
Deferred shares granted during the period    
(2,874
 )    
(6,118
 )    
(804
 )
Deferred shares forfeited during the period    
(880
 )    
(1,007
 )    
(322
 )
Deferred shares outstanding at ended year    
16,300
      
19,260
      
19,056