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Note 21 - Deferred Income Tax (Details Textual)
$ in Millions
Dec. 31, 2020
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Recognized tax losses expiring within one year, percentage 0.00%
Recognized tax losses expiring in two to five years, percentage 1.70%
Recognized tax losses expiring in more than five years, percentage 98.30%
Unused tax losses for which no deferred tax asset recognised $ 173.7
Unused tax losses for which no deferred tax asset recognised, percent expiring in less than one year 4.60%
Unused tax losses for which no deferred tax asset recognised, percent expiring between two and five years 17.10%
Unused tax losses for which no deferred tax asset recognised, percent expiring in more than five years 78.30%
UNITED STATES  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Deferred tax assets related to taxable losses of subsidiaries $ 438.8