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Note 24 - Share-based Payments (Tables)
 12 Months Ended
Dec. 31, 2018
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     2018
(i)
     2017
(i)
     2016
(i)
                         
Fair value of options granted    
5.62
 
    
6.51
 
    
6.21
 
Share price    
18.04
 
    
19.80
 
    
17.18
 
Exercise price    
18.04
 
    
19.80
 
    
17.18
 
Expected volatility    
26.2
%
    
26.7
%
    
27.0
%
Vesting year    
5
 
    
5
 
    
5
 
Expected dividends    
5
%
    
5
%
    
5
%
Risk-free interest rate    
9.6
%
(ii)
    
10.1
%
(ii)
    
12.4
%
(ii)
Disclosure of the number of share options [text block]
Thousand options     2018       2017       2016  
                         
Options outstanding at January 1
st
    
135,221
      
131,244
      
121,770
  
Options issued during the period    
19,899
      
20,435
      
24,806
  
Options exercised during the period    
(9,988
 )    
(13,548
 )    
(11,613
 )
Options forfeited during the period    
(3,804
 )    
(2,910
 )    
(3,719
 )
Options outstanding at ended year    
141,328
      
135,221
      
131,244
  
Disclosure of weighted average exercise prices of share options [text block]
In R$ per share     2018       2017       2016  
                         
Options outstanding at January 1
st
    
15.27
      
13.87
      
12.36
  
Options issued during the period    
18.04
      
19.82
      
17.18
  
Options forfeited during the period    
18.55
      
17.88
      
12.83
  
Options exercised during the period    
7.47
      
5.81
      
2.52
  
Options outstanding at ended period    
16.16
      
15.27
      
13.87
  
Options exercisable at ended period    
2.25
      
3.78
      
3.66
  
Disclosure of number and weighted average exercise prices of other equity instruments [text block]
Thousand deferred shares     2018       2017       2016  
             
Deferred shares outstanding at January 1
st
    
16,300
      
19,260
      
19,056
  
New deferred shares during the period    
426
      
794
      
7,329
  
Deferred shares granted during the period    
(3,429
 )    
(2,874
 )    
(6,118
 )
Deferred shares forfeited during the period    
(989
 )    
(880
 )    
(1,007
 )
Deferred shares outstanding at ended year    
12,308
      
16,300
      
19,260
  
Thousand deferred shares     2018       2017       2016  
                         
Restricted shares outstanding at January
1st
    
–
       –       –  
New restricted shares during the period    
13,055
       –       –  
Restricted shares granted during the period    
(296
 )     –       –  
Restricted shares forfeited during the period    
(103
 )     –       –  
Restricted shares outstanding at ended year    
12,656
       –       –