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Note 14 - Goodwill - Weighted Average Cost of Capital (Details) - Goodwill [member] - North Latin America segment [member]
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Bottom of range [member]    
Statement Line Items [Line Items]    
weighted average cost of capital, goodwill 8.59% 8.39%
Top of range [member]    
Statement Line Items [Line Items]    
weighted average cost of capital, goodwill 10.29% 10.27%