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Note 20 - Other Liabilities - Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Values at the beginning of the year $ 79,200  
At the end of the year 91,200 $ 79,200
Fair value of funded post-employment benefits [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year (145,692) (132,913)
Translation differences 7,514 (6,802)
Return on plan assets (4,936) (5,849)
Remeasurements 3,967 (5,874)
Contributions paid to the plan (3,108) (6,230)
Benefits paid from the plan 9,453 11,654
Other 364 323
At the end of the year (132,438) (145,692)
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)
Benefits paid from the plan 9,453 11,654
At the end of the year $ 146,885 $ 165,485
Equity instruments 53.50% 53.40%
Debt instruments 42.80% 42.90%
Others 3.70% 3.70%