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Note 20 - Other Liabilities - Post-employment benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Values at the beginning of the year $ 79,200    
Interest cost 2,914 $ 20,534 $ 43,872
At the end of the year 91,200 79,200  
Unfunded post-employment benefits [member]      
Statement Line Items [Line Items]      
Values at the beginning of the year 101,889 96,229  
Translation differences (3,849) 2,893  
Current service cost 7,400 7,851  
Interest cost 5,070 5,462  
Curtailments and settlements 21  
Remeasurements (*) [1] (3,946) 10,907  
Benefits paid from the plan (9,719) (22,107)  
Other 473 633  
At the end of the year 97,318 101,889 96,229
Funded post-employment benefits [member]      
Statement Line Items [Line Items]      
Values at the beginning of the year 165,485 159,612  
Translation differences (8,182) 7,300  
Current service cost 1,328 592  
Interest cost 5,691 6,034  
Remeasurements (*) [2] (7,984) 3,602  
Benefits paid from the plan (9,453) (11,654)  
At the end of the year 146,885 165,485 $ 159,612
Present value of funded obligations 146,885 165,486  
Fair value of plan assets (132,438) (145,692)  
Liability (*) [3] $ 14,447 $ 19,794  
[1] For 2018 a gain of $0.2 million is attributable to demographic assumptions and a gain of $3.7 million to financial assumptions. For 2017 a loss of $0.09 million is attributable to demographic assumptions and a loss of $10.8 million to financial assumptions.
[2] For 2018 a loss of $0.4 million is attributable to demographic assumptions and a gain of $8.4 million to financial assumptions. For 2017 a gain of $0.4 million is attributable to demographic assumptions and a loss of $4.1 million to financial assumptions. respectively.
[3] In 2018 and 2017, $3.3 million corresponding to an overfunded plan were reclassified within other non-current assets, respectively.