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Subsequent events (Narrative) (Details) - Class B shares - Subsequent events
Feb. 05, 2020
CAD ($)
shares
Feb. 04, 2020
CAD ($)
shares
Jan. 02, 2020
Share
Disclosure of non-adjusting events after reporting period [line items]      
Number of instruments granted in share-based payment arrangement | Share     27,580
Solarvest BioEnergy Inc.      
Disclosure of non-adjusting events after reporting period [line items]      
Number of additional shares issued to settle derivative liability | shares   225,371  
Derivative liabilities settled through issuance of shares | $   $ 2,646,269  
Cannara Biotech Inc.      
Disclosure of non-adjusting events after reporting period [line items]      
Number of shares sold for investment in Cannara | shares 85,003,750    
Gross proceeds of common stock | $ $ 7,743,492