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Income taxes (Narrative) (Details) - CAD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2019
Major components of tax expense (income) [abstract]        
Applicable tax rate 26.50% 26.50% 26.50% 26.50%
Recognized estimated investment tax credits $ 127,325