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Note 24 - Share-based Payments (Details Textual)
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2015
Statement Line Items [Line Items]        
Option life, share options granted [1] 5 5 5  
Weighted average remaining contractual life of outstanding share options 6.27 6.4 5.96  
Number of share options outstanding in share-based payment arrangement at end of period 141,328,000 135,221,000 131,244,000 121,770,000
Number of share options vested in share-based payment arrangement 55,538,000 40,150,000    
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise R$ 21.83 R$ 18.87    
Expense from share-based payment transactions with employees 162,700,000 236,900,000 R$ 189,300,000  
Bottom of range [member]        
Statement Line Items [Line Items]        
Exercise prices of the outstanding options 0.001 0.001 0.02  
Top of range [member]        
Statement Line Items [Line Items]        
Exercise prices of the outstanding options R$ 27.43 R$ 26.09 R$ 28.32  
Grant one [member]        
Statement Line Items [Line Items]        
Profit allocation, share-based payments, allocation option one 30.00%      
Profit allocation, share-based payments, allocation option two 40.00%      
Profit allocation, share-based payments, allocation option three 60.00%      
Profit allocation, share-based payments, allocation option four 70.00%      
Profit allocation, share-based payments, allocation option five 100.00%      
Option life, share options granted 5      
Grant two [member]        
Statement Line Items [Line Items]        
Option life, share options granted 5      
Lot A [member]        
Statement Line Items [Line Items]        
Option life, share options granted 5      
Lot B [member]        
Statement Line Items [Line Items]        
Option life, share options granted 10      
Deferred stock units of Grant One [member]        
Statement Line Items [Line Items]        
Number of other new equity instruments introduced in share-based payment arrangement 426,000 794,000 7,329,000  
Fair value of other equity instruments granted in share-based payment arrangement R$ 7,500,000 R$ 15,200,000    
Share-based payment arrangement, other equity instruments, grace period 5 years      
Number of other equity instruments granted in share-based payment arrangement 3,429,000 2,874,000 6,118,000  
Restricted shares under the share-based plan [Member]        
Statement Line Items [Line Items]        
Fair value of other equity instruments granted in share-based payment arrangement R$ 239,100,000      
Share-based payment arrangement, other equity instruments, grace period 5 years      
Number of other equity instruments granted in share-based payment arrangement 13,055      
[1] Information based on weighted average plans granted, except for the expected dividends and risk-free interest rate.