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Income taxes - Losses Expiry (Details)
$ in Thousands
Nov. 30, 2021
USD ($)
CA  
Non-capital losses $ 51,808
Alaska, USA  
Operating losses 142,524
2022 | Alaska, USA  
Operating losses 366
2023 | Alaska, USA  
Operating losses 960
2024 | Alaska, USA  
Operating losses 569
2025 | Alaska, USA  
Operating losses 1,530
Thereafter | CA  
Non-capital losses 51,808
Thereafter | Alaska, USA  
Operating losses $ 139,099