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Note 22 - Current Allowances and Provisions - Deducted From Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts - trade receivables [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year $ (78,385) $ (85,724)
Effect of adoption of new standards 6,423  
Translation differences 329 (345)
Additional allowances (1,751)  
Used 6,849 2,263
Reversals / (additional) allowances   5,421
Values at the end of the year (66,535) (78,385)
Allowance for other doubtful accounts - other receivables [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year (6,255) (6,332)
Effect of adoption of new standards  
Translation differences 359 (220)
Additional allowances (1,179)  
Used 291 381
Reversals / (additional) allowances   (84)
Values at the end of the year (6,784) (6,255)
Allowance for inventory obsolescence [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year (216,068) (240,242)
Effect of adoption of new standards  
Translation differences 3,575 (3,575)
Additional allowances (25,457)  
Used 28,154 14,832
Reversals / (additional) allowances   12,917
Values at the end of the year $ (209,796) $ (216,068)