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Note 12 - Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
    Three months ended March 31,  
    2019     2020  
    $     $  
    (Unaudited)     (Unaudited)  
             
Research and development    
156
     
3,183
 
Selling, general and administrative    
215
     
287
 
                 
Total    
371
     
3,470