Share capital - Warrants (Details) - USD ($)	12 Months Ended
Nov. 30, 2019	Nov. 30, 2020
Share capital.
Exercise of warrants (Shares)	6,521,740
Proceeds from Issuance of Warrants	$ 9,900,000
Warrants outstanding		$ 0

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration