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Note 10 - Other Income (Expense), Net (Tables)
3 Months Ended
Feb. 28, 2021
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
  Three months ended 
  

February 28,

  

February 29,

 
  

2021

  

2020

 

Interest income

 $178  $517 

Foreign exchange gain (loss)

  (483)  378 

Change in fair market value of marketable securities

  226   (8)
  $(79) $887