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Note 30 - Related Party Transactions (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [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 $ 33.7 $ 33.7 $ 45.8
Key management personnel compensation, share-based payment $ 4.8 $ 5.6 $ 4.7
San Faustin S.A. [member]      
Statement Line Items [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]      
Statement Line Items [Line Items]      
Proportion of ownership interest in associate 0.08%    
Units issued, related party transactions (in shares) 468,000 558,000 484,000