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Note 3 - Summary of Significant Accounting Policies (Details Textual) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Jan. 01, 2018
Statement Line Items [Line Items]        
Cumulative effects of new standards in period of adoption [1]   R$ (355.4)    
Amortization period of intangible assets of definite useful life 5 years 5 years    
Bottom of range [member]        
Statement Line Items [Line Items]        
Amortization period of intangible assets of definite useful life 3 years      
Top of range [member]        
Statement Line Items [Line Items]        
Amortization period of intangible assets of definite useful life 5 years      
IFRS 15 revenue from contracts with customers [member]        
Statement Line Items [Line Items]        
Cumulative effects of new standards in period of adoption       R$ 355.4
IFRS 16 leases [member] | Impact of new initial application of new standards [member]        
Statement Line Items [Line Items]        
Right-of-use assets     R$ 1,547.4  
Total lease liabilities     R$ 1,670.1  
Lease liabilities, weighted average rate applied     12.50%  
[1] As described in Note 3 - Summary of significant account policies.