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Financial instruments and risk management - Financial instruments (Details) - CAD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Level 1 | Carrying Amount | Convertible debentures
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	$ 129,750	$ 129,750
Level 1 | Fair Value | Convertible debentures
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	131,795	135,963
Level 2 | Carrying Amount | Financing obligations
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	32,889	47,945
Level 2 | Carrying Amount | Mortgage
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	29,231	30,000
Level 2 | Fair Value | Financing obligations
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	30,783	47,010
Level 2 | Fair Value | Mortgage
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-term debt	$ 24,329	$ 29,756

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611

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- References

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