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Note 28 - Related Party Transactions - Transactions Carried Out With Related Parties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
$ 168,545 $ 142,374 $ 66,277
407,545 314,943 152,256
95,762 104,839  
Associates [member]      
Statement Line Items [Line Items]      
Sales of goods to related parties 23,709 32,362 21,174
Sales of services to related parties 7,641 11,637 9,542
Purchases of goods to related parties 245,186 234,361 67,048
Purchases of services to related parties 9,556 12,077 11,528
Receivables from non-consolidated parties 122,135 117,853  
Payables to non-consolidated parties (33,197) (49,354)  
Other related parties [member]      
Statement Line Items [Line Items]      
Sales of goods to related parties 131,548 94,624 32,613
Sales of services to related parties 5,647 3,751 2,948
Purchases of goods to related parties 106,624 17,711 20,150
Purchases of services to related parties 46,179 50,794 $ 53,530
Receivables from non-consolidated parties 24,419 50,815  
Payables to non-consolidated parties $ (17,595) $ (14,475)