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Note 15 - Derivative Financial Assets (Tables)
 6 Months Ended
Jun. 30, 2020
Statement Line Items [Line Items]  
Disclosure of derivative financial assets [text block]
              December 31,  
     
2020
      
2019
  
                 
Derivatives not designated as hedging instrument:                
Gold exchange traded fund (Gold ETF)    
1,112
      
-
  
Gold Hedge    
-
      
102
  
     
1,112
      
102
  
Disclosure of fair value losses on derivative assets [text block]
Fair value losses on derivative assets     2020       2019  
                 
Gold ETF    
46
      
-
  
Gold hedge    
102
      
324
  
     
148
      
324