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Note 21 - Deferred Income Tax - Net Deferred Tax Liabilities (Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]        
Deferred tax assets     $ (205,590) $ (225,680)
Deferred tax liabilities     254,801 336,982
Net deferred tax liability (asset) $ 49,211 $ 111,302 $ 49,211 $ 111,302
At the beginning of the year 111,302 197,433    
Translation differences 6,854 1,100    
Increase due to business combinations 32,099 10,847    
Charged to other comprehensive income (3,146) (838)    
Income statement charge / (credit) (97,898) (97,240)    
At the end of the year $ 49,211 $ 111,302