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Note 12 - Net Foreign Exchange Gain (Loss) (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of foreign currency gains (losses) [text block]
    2019   2018   2017
             
Unrealised Foreign exchange gain(loss)    
31,411
      
230
      
(379
 )
Realised foreign exchange loss    
(1,750
 )    
(7
 )    
(1
 )
Net foreign exchange gain/(loss)    
29,661
      
223
      
(380
 )