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Note 23 - Employee Benefits (Details Textual) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Post-employment benefit expense, defined contribution plans R$ 32.2 R$ 18.9 R$ 25.3
Defined benefit obligation, at present value 1,892.3 1,778.9 1,488.2
Return on plan assets, net defined benefit liability (asset) 99.0 208.5  
Amount up to the asset ceiling not exceeding the present value of future benefits in a defined benefit plan 64.3 58.4  
Estimate of contributions expected to be paid to plan for next annual reporting period 255.8    
Two health care plans from Fundacao Zerrenner [member]      
Statement Line Items [Line Items]      
Defined benefit obligation, at present value R$ 677.9 R$ 762.0 R$ 683.4