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Note 11 - Other Income (Expense) (Tables)
12 Months Ended
Nov. 30, 2017
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
    Years ended November 30,
    2017   2016   2015
Interest income   $
1,172
    $
947
    $
740
 
Interest expense    
(5,228
)    
(4,551
)    
(5,188
)
Foreign exchange gain (loss)    
(531
)    
182
     
4,771
 
Write-down of investments    
     
     
(426
)
    $
(4,587
)   $
(3,422
)   $
(103
)