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Income taxes - Income tax reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2019
Income taxes      
Combined federal and provincial statutory tax rate 27.00% 27.00% 27.00%
Income tax (recovery) at statutory rate $ (5,848) $ 43,677 $ (7,534)
Difference in foreign tax rates (194) 2,424 (281)
Effect of foreign exchange changes   (4)  
Non-deductible expenditures 937 1,009 4,061
Income from option payments applied as proceeds of sale   (8,812)  
Return to provision adjustments 116 (6) 193
Impact of new lease accounting rules (ASC 842 adoption)   (28)  
Expiry of losses     277
Change in valuation allowance 4,989 (38,260) 3,284
Income tax recovery (expense) $ 0 $ 0 $ 0