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Other investments (Narrative) (Details) - CAD ($)
 1 Months Ended 12 Months Ended
Feb. 05, 2020
Feb. 04, 2020
Nov. 04, 2019
May 07, 2019
Sep. 06, 2018
Nov. 22, 2019
Sep. 20, 2019
Apr. 24, 2019
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2018
May 31, 2018
Disclosure Of Other Investments [Line Items]                        
Loss on change in fair value of derivative liability                 $ 3,568,305      
Proceeds from issuing shares                 4,593,777 $ 44,987,422    
Derivative liability                 $ 2,646,269      
Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Share issue price per share     $ 20.10                  
Proceeds from issuing shares     $ 4,593,777                  
Pharmadrug Inc. | Share Exchange Agreement                        
Disclosure Of Other Investments [Line Items]                        
Number of shares acquired               13,562,386        
Share price per share               $ 0.2212        
Pharmadrug Inc. | Share Exchange Agreement | Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Number of shares issued in share exchange             61,892 65,577        
Share issue price per share               $ 45.75        
Value of shares issued in share exchange               $ 3,000,000        
Loss on change in fair value of derivative liability             $ 1,422,036          
Pharmadrug Inc. | Share Exchange Agreement | Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Number of shares issued in share exchange             61,892 65,577        
Share issue price per share               $ 45.75        
Value of shares issued in share exchange               $ 3,000,000        
Loss on change in fair value of derivative liability               $ 1,422,036        
Cannara Biotech Inc. | Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Number of shares held subject to escrow arrangement                 85,003,750      
Quoted market price of investments                 $ 0.125      
Percentage of aggregate discount for escrow                 19.53%      
Aggregate discount for shares in escrow                 $ 1,556,431      
Cannara Biotech Inc. | Class B shares | Subsequent events                        
Disclosure Of Other Investments [Line Items]                        
Proceeds from issuing shares $ 7,743,492                      
Cannara Biotech Inc. | Unrestricted Class B shares | Level 1                        
Disclosure Of Other Investments [Line Items]                        
Number of shares held subject to escrow arrangement                 21,250,935      
Cannara Biotech Inc. | Class B shares held in escrow | Level 2                        
Disclosure Of Other Investments [Line Items]                        
Number of shares held subject to escrow arrangement                 63,752,815      
Clover Cannastrip Thin Film Technologies Corp.                        
Disclosure Of Other Investments [Line Items]                        
Value of subscribed equity units in brokered private placement         $ 1,500,000              
High Tide Inc.                        
Disclosure Of Other Investments [Line Items]                        
Number of shares held                 4,551,999      
Number of warrants held                 2,000,000      
Proceeds from sale of shares and warrants           $ 614,520            
HUGE Shops                        
Disclosure Of Other Investments [Line Items]                        
Number of shares held                 17,333,333      
Subscription price per share                 $ 0.075      
Percentage of decline in fair value of investment                 41.50%      
Change in fair value of investment                 $ 54,000      
SciCann Therapeutics Inc.                        
Disclosure Of Other Investments [Line Items]                        
Number of shares held                 117,648      
Subscription price per share                     $ 17 $ 17
Percentage of decline in fair value of investment                 64.40%      
Change in fair value of investment                 $ 129,000      
Solarvest BioEnergy Inc.                        
Disclosure Of Other Investments [Line Items]                        
Share price per share                 $ 0.145      
Loss on change in fair value of derivative liability                 $ 2,146,269      
Number of shares held       3,000,000                
Number of warrants held       3,000,000                
Principal amount of convertible debenture       $ 2,400,000         $ 2,400,000      
Fair value of shares and warrants acquired       3,000,000                
Exercise price of warrants                 $ 0.25      
Quoted market price of investments                 $ 0.145      
Risk free rate of warrants                 1.71%      
Expected volatility of warrants                 94.00%      
Expected term of warrants                 1 year 4 months 6 days      
Expected dividend yield                 0.00%      
Debt conversion ratio                 1      
Solarvest BioEnergy Inc. | Subsequent events | Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Number of additional shares issued to settle derivative liability   225,371                    
Solarvest BioEnergy Inc. | Share Exchange Agreement                        
Disclosure Of Other Investments [Line Items]                        
Derivative financial liabilities       500,000                
Guaranteed minimum liquidation value of shares       $ 3,000,000         $ 3,000,000      
Solarvest BioEnergy Inc. | Share Exchange Agreement | Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Number of shares issued in share exchange       49,751                
Solarvest BioEnergy Inc. | Share Exchange Agreement | Class B shares                        
Disclosure Of Other Investments [Line Items]                        
Number of shares issued in share exchange       49,751                
Share issue price per share       $ 50.25                
Value of shares issued in share exchange       $ 2,500,000