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Note 11 - Finance Cost and Income (Details Textual) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Net finance cost, realization of exchange value R$ 179.1 R$ 835.7
Net finance cost, related to PERT 2017   R$ 141.0