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Note 29 - Related Party Transactions - Transactions Carried Out With Related Parties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
$ 142,374 $ 66,277 $ 125,846
314,943 152,256 390,391
104,839 96,522  
Associates [member]      
Statement Line Items [Line Items]      
Sales of goods to related parties 32,362 21,174 24,019
Sales of services to related parties 11,637 9,542 10,154
Purchases of goods to related parties 234,361 67,048 260,280
Purchases of services to related parties 12,077 11,528 16,153
Receivables from related parties 117,853 117,187  
Payables to related parties (49,354) (21,314)  
Other related parties [member]      
Statement Line Items [Line Items]      
Sales of goods to related parties 94,624 32,613 87,663
Sales of services to related parties 3,751 2,948 4,010
Purchases of goods to related parties 17,711 20,150 35,153
Purchases of services to related parties 50,794 53,530 $ 78,805
Receivables from related parties 50,815 13,357  
Payables to related parties $ (14,475) $ (12,708)