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Note 17 - Trade Receivables, Net - Summary of the Aging of Trade Receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]      
Guaranteed $ 234,427 $ 286,250  
Not guaranteed 1,162,515 1,517,651  
Guaranteed and not guaranteed $ 1,396,942 $ 1,803,901  
Expected loss rate 0.09% 0.07%  
Allowances for doubtful accounts $ (1,294) $ (1,396)  
Nominative allowances for doubtful accounts (47,488) (65,139)  
Net Value 1,348,160 1,737,366 $ 1,214,060
Current trade receivables, not due [member]      
Statement Line Items [Line Items]      
Guaranteed 205,764 254,743  
Not guaranteed 948,449 1,180,788  
Guaranteed and not guaranteed $ 1,154,213 $ 1,435,531  
Expected loss rate 0.04% 0.04%  
Allowances for doubtful accounts $ (529) $ (564)  
Nominative allowances for doubtful accounts  
Net Value 1,153,684 1,434,967  
Current trade receivables, past due, less than 180 days [member]      
Statement Line Items [Line Items]      
Guaranteed 26,899 30,884  
Not guaranteed 157,960 260,675  
Guaranteed and not guaranteed $ 184,859 $ 291,559  
Expected loss rate 0.24% 0.17%  
Allowances for doubtful accounts $ (455) $ (510)  
Nominative allowances for doubtful accounts (1,922) (1,436)  
Net Value 182,482 289,613  
Current trade receivables, past due, greater than 180 days [member]      
Statement Line Items [Line Items]      
Guaranteed 1,764 623  
Not guaranteed 56,106 76,188  
Guaranteed and not guaranteed $ 57,870 $ 76,811  
Expected loss rate 0.57% 0.43%  
Allowances for doubtful accounts $ (310) $ (322)  
Nominative allowances for doubtful accounts (45,566) (63,703)  
Net Value $ 11,994 $ 12,786