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Note 11 - Finance Cost and Income - Interest Income (Details) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Cash and cash equivalents R$ 233.4 R$ 241.5 R$ 425.9
Investment securities held for trading 26.9 51.1 149.6
Other receivables 198.5 221.0
R$ 458.8 R$ 513.6 R$ 575.5