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Note 23 - Current Allowances and Provisions - Deducted From Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts - trade receivables [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year $ (85,724) $ (101,480)
Translation differences (345) (841)
Reversals / (additional) allowances 5,421 12,573
Used 2,263 4,004
Transfer to held for sale   20
Values at the end of the year (78,385) (85,724)
Allowance for other doubtful accounts - other receivables [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year (6,332) (7,082)
Translation differences (220) 75
Reversals / (additional) allowances (84) (432)
Used 381 1,107
Transfer to held for sale  
Values at the end of the year (6,255) (6,332)
Allowance for inventory obsolescence [member]    
Statement Line Items [Line Items]    
Values at the beginning of the year (240,242) (229,200)
Translation differences (3,575) (2,715)
Reversals / (additional) allowances 12,917 (32,765)
Used 14,832 23,542
Transfer to held for sale   896
Values at the end of the year $ (216,068) $ (240,242)