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Note 9 - Payroll and Related Benefits - Schedule of Payroll and Related Benefits (Details) - BRL (R$)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Wages and salaries R$ 3,371,200,000 R$ 3,038,900,000 R$ 3,086,500,000
Social security contributions 741,100,000 727,200,000 756,100,000
Other personnel cost 616,200,000 613,800,000 561,300,000
Increase in liabilities for defined benefit plans 138,700,000 151,700,000 142,300,000
Expense from share-based payment transactions with employees 236,900,000 189,300,000 209,400,000
Contributions to defined contribution plans 18,900,000 25,300,000 19,000,000
R$ 5,123,000,000 R$ 4,746,200,000 R$ 4,774,600,000