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Note 9 - Share-based Compensation - Summary of Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Share-based Compensation Expense $ 1,942 $ 2,049 $ 3,891 $ 5,974
Employee Stock Option [Member]        
Share-based Compensation Expense 938 878 1,886 3,636
Performance Share Units [Member]        
Share-based Compensation Expense 957 1,119 1,909 2,229
Deferred Share Units [Member]        
Share-based Compensation Expense $ 47 $ 52 $ 96 $ 109