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Note 29 - Related Party Transactions (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [line items]      
Total number of shares issued (in shares) 1,180,536,830 1,180,536,830 1,180,536,830
Key management personnel compensation, short-term employee benefits $ 27.4 $ 33.7 $ 33.7
Key management personnel compensation, share-based payment $ 5.0 $ 4.8 $ 5.6
San Faustin S.A. [member]      
Disclosure of transactions between related parties [line items]      
Total number of shares issued (in shares) 713,605,187    
Proportion of ownership interest in associate 60.45%    
Key management personnel of entity or parent [member]      
Disclosure of transactions between related parties [line items]      
Proportion of ownership interest in associate 0.08%    
Units issued, related party transactions (in shares) 522,000 468,000 558,000