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Note 17 - Deferred Income Tax and Social Contribution - Applied Rates (Details)
 12 Months Ended
Dec. 31, 2017
Central America and the Caribbean [member] | Bottom of range [member]  
Statement Line Items [Line Items]  
Applied rates 23.00%
Central America and the Caribbean [member] | Top of range [member]  
Statement Line Items [Line Items]  
Applied rates 31.00%
Latin America [member] | Bottom of range [member]  
Statement Line Items [Line Items]  
Applied rates 14.00% [1]
Latin America [member] | Top of range [member]  
Statement Line Items [Line Items]  
Applied rates 35.00% [1]
Canada [member]  
Statement Line Items [Line Items]  
Applied rates 26.00%
[1] Amendments to Argentine tax legislation approved on December 29, 2017 affect tax periods beginning in October 2018 and reduce the income tax rate in the first two years from 35% to 30% and, as a after, to 25%. For fiscal year 2017, however, there is an impact of R $ 33.0 million in deferred income tax.