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Note 17 - Trade Receivables - Summary of the Aging of Trade Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Guaranteed $ 247,079 $ 355,508
Not guaranteed 1,045,366 684,901
1,292,445 1,040,409
Allowance for doubtful accounts (see Note 23 (i)) (78,385) (85,724)
Net Value 1,214,060 954,685
Current trade receivables, not due [member]    
Statement Line Items [Line Items]    
Guaranteed 219,764 272,393
Not guaranteed 841,737 518,984
1,061,501 791,377
Allowance for doubtful accounts (see Note 23 (i)) (62)
Net Value 1,061,501 791,315
Current trade receivables, past due, less than 180 days [member]    
Statement Line Items [Line Items]    
Guaranteed 22,978 32,241
Not guaranteed 115,245 87,379
138,223 119,620
Allowance for doubtful accounts (see Note 23 (i)) (67)
Net Value 138,223 119,553
Current trade receivables, past due, greater than 180 days [member]    
Statement Line Items [Line Items]    
Guaranteed 4,337 50,874
Not guaranteed 88,384 78,538
92,721 129,412
Allowance for doubtful accounts (see Note 23 (i)) (78,385) (85,595)
Net Value $ 14,336 $ 43,817