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Note 3 - Short-term Investments (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Investment [Table Text Block]
  

Amortized

cost

  

Gross

unrealized

gains

  

Gross

unrealized

losses

  

Fair value

(Net carrying amount)

 
   $   $   $   $ 

Trading debt securities

                
Financial products issued by commercial banks  13,025   144   -   13,169 

Available-for-sale debt securities

                

Time deposits

  16,000   -   -   16,000 
Financial products issued by commercial banks  1,569   5   -   1,574 

Total

  30,594   149   -   30,743