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Note 17 - Deferred Income Tax and Social Contribution (Details Textual) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Applicable tax rate 29.22% 30.16% 31.59%
Unrecognised tax losses and temporary differences R$ 427.4 R$ 455.6  
Tax losses without limitation R$ 1,709.5 R$ 2,285.2  
BRAZIL      
Statement Line Items [Line Items]      
Applicable tax rate   25.00%  
Nominal social contribution rate     9.00%
ARGENTINA      
Statement Line Items [Line Items]      
Applicable tax rate 35.00%    
Applicable tax rate, first two years after legislation changes 30.00%    
Applicable tax rate, later than two years after legislation changes 25.00%    
Deferred tax expense (income) relating to tax rate changes or imposition of new taxes R$ (33.0)