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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.

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