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Note 23 - Employee Benefits - Actuarial Assumptions (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Bottom of range [member]      
Statement Line Items [Line Items]      
Discount rate [1] 3.60% 3.90% 4.10%
Inflation [1] 2.00% 2.00% 2.00%
Future salary increases [1] 1.00% 1.00% 1.00%
Future pension increases [1] 2.00% 2.00% 2.00%
Medical cost trend rate [1] 4.50% 3.80% 4.50%
Life expectation for an over 65 years old male [1] 83 80 85
Life expectation for an over 65 years old female [1] 86 83 88
Top of range [member]      
Statement Line Items [Line Items]      
Discount rate [1] 10.60% 10.50% 12.10%
Inflation [1] 5.00% 5.20% 5.20%
Future salary increases [1] 8.70% 8.50% 8.80%
Future pension increases [1] 4.30% 4.50% 4.50%
Medical cost trend rate [1] 7.90% 8.20% 8.20%
Dental claims trend rate [1]    
Life expectation for an over 65 years old male [1] 87 86 70
Life expectation for an over 65 years old female [1] 89 89 71
Weighted average [member]      
Statement Line Items [Line Items]      
Medical cost trend rate [1] 7.90% 8.20% 8.20%
Dental claims trend rate [1] 4.30% 4.50% 4.50%
[1] Includes assumptions in Latin America - North, Latin America - South and Canada.