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Note 23 - Derivative Financial Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Disclosure of derivative financial assets [text block]
    2020     2019     January 1, 2019  
                   
Derivatives not designated as hedging instruments:                        
Gold exchange-traded fund ("Gold ETF")    
1,184
      
–
       –  
Gold Hedge    
–
      
102
       –  
     
1,184
      
102
       –  
Disclosure of fair value losses on derivative assets [text block]
Fair value losses on derivative assets   2020     2019     2018  
                   
Gold ETF    
164
      
–
      
–
  
Gold hedge    
102
      
601
      
360
  
     
266
      
601
      
360