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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
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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 |  |

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