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Note 17 - Deferred Income Tax and Social Contribution - Deferred Tax Related to Tax Losses (Details) - BRL (R$) R$ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses |  | R$ (49.9) | R$ (61.5) | R$ 276.3
Unused tax losses [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses |  | 501.0 | R$ 1,139.9 |
Unused tax losses [member] | Not later than one year [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses |  | 209.0 |  |
Unused tax losses [member] | Later than one year and not later than two years [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses |  | 98.3 |  |
Unused tax losses [member] | Later than three years and not later than four years [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses |  | 16.1 |  |
Unused tax losses [member] | Later than four years and not later than five years [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses |  | 10.6 |  |
Unused tax losses [member] | Later than five years [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Deferred Tax Related to Tax Losses | [1] | R$ 167.0 |  |
[1] | There is no expectation of realization that exceeds the term of 10 years.

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