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Note 28 - Operating Leases (Details Textual) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Total lease and sublease payments recognised as expense R$ 39.0 R$ 43.4 R$ 58.7