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Note 11 - Net Foreign Exchange Gain (Tables)
 12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Disclosure of foreign currency gains (losses) [text block]
    2020     2019     2018  
                   
Unrealised foreign exchange gain    
8,367
      
31,411
      
230
  
Realised foreign exchange loss    
(4,062
 )    
(1,750
 )    
(7
 )
Net foreign exchange gain    
4,305
      
29,661
      
223