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Note 24 - Share-based Payments (Details Textual)
12 Months Ended
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2015
BRL (R$)
Dec. 31, 2014
BRL (R$)
Statement Line Items [Line Items]        
Option life, share options granted [1] 5 5 5  
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period R$ 15.27 R$ 13.87 R$ 12.36 R$ 10.07
Weighted average remaining contractual life of outstanding share options 6.4 5.96 6.3  
Number of share options outstanding in share-based payment arrangement at end of period 135,221,000 131,244,000 121,770,000 126,149,000
Number of share options vested in share-based payment arrangement 40,150,000 52,780,000    
Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise R$ 18.87 R$ 18.41    
Expense from share-based payment transactions with employees 236,900,000 189,300,000 R$ 209,400,000  
Bottom of range [member]        
Statement Line Items [Line Items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period 0.001 0.02 0.35  
Top of range [member]        
Statement Line Items [Line Items]        
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period R$ 26.09 R$ 28.32 R$ 26.57  
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 794,000 7,329,000 2,692,000  
Weighted average exercise price of other equity instruments granted in share-based payment arrangement R$ 15,200,000 R$ 133,900,000    
Cliff vest period 5 years      
[1] Information based on weighted average plans granted, except for the expected dividends and risk-free interest rate.