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Income taxes - Income tax reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 30, 2023
Nov. 30, 2022
Nov. 30, 2021
Income taxes      
Combined federal and provincial statutory tax rate 27.00% 27.00% 27.00%
Income tax (recovery) at statutory rate $ (4,037) $ (6,549) $ (5,848)
Difference in foreign tax rates (118) (252) (194)
Non-deductible expenditures 239 374 937
Change in estimates in respect of prior years 15 39 116
Change in valuation allowance 3,901 6,388 4,989
Income tax recovery (expense) $ 0 $ 0 $ 0