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Note 23 - Employee Benefits - Employee Benefit Revenue/(Expenses) Allocation (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Employee Benefit Revenue/(Expenses) Allocation R$ (142.0) R$ (138.7) R$ (151.7)
Employee benefit revenue (expenses) allocated to cost of sales [member]      
Statement Line Items [Line Items]      
Employee Benefit Revenue/(Expenses) Allocation (19.2) (22.3) (24.5)
Employee benefit revenue (expenses) allocated to sales and marketing expenses [member]      
Statement Line Items [Line Items]      
Employee Benefit Revenue/(Expenses) Allocation (8.8) (5.0) (9.5)
Employee benefit revenue (expenses) allocated to administrative expenses [member]      
Statement Line Items [Line Items]      
Employee Benefit Revenue/(Expenses) Allocation (11.0) (10.1) (10.2)
Employee benefit revenue (expenses) allocated to financial expenses [member]      
Statement Line Items [Line Items]      
Employee Benefit Revenue/(Expenses) Allocation (103.0) (101.3) (105.6)
Employee benefit revenue (expenses) allocated to exceptional items [member]      
Statement Line Items [Line Items]      
Employee Benefit Revenue/(Expenses) Allocation R$ (1.9)