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Note 10 - Other Income (Expense) (Tables)
6 Months Ended
May 31, 2017
Notes Tables  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
    Three months ended May 31,   Six months ended May 31,
    2017   2016   2017   2016
Interest income   $
307
    $
220
    $
554
    $
401
 
Interest expense    
(1,307
)    
(1,153
)    
(2,520
)    
(2,244
)
Foreign exchange gain (loss)    
194
     
(797
)    
33
     
(272
)
    $
(806
)   $
(1,730
)   $
(1,933
)   $
(2,115
)