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Short-term investments (Narrative) (Details)
$ in Thousands, $ in Millions
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Cash and Cash Equivalents [Line Items]      
Short-term investments   $ 6,004 $ 1,038
Mutual Fund [Member]      
Cash and Cash Equivalents [Line Items]      
Short-term investments $ 1.3 $ 6,000 $ 1,000