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Investment in associates (Details)
$ in Thousands
 3 Months Ended
Jun. 30, 2022
CAD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
CAD ($)
Mar. 31, 2022
USD ($)
Statement [Line Items]        
Beginning Balance, Carrying amount $ 59,990,000   $ 0  
Acquisition of equity investment   $ 151 60,439,000  
Company's share of net loss of associates   1,441   $ 449
Ending Balance, Carrying amount 58,700,000 58,700 59,990,000  
Dolly Varden [Member]        
Statement [Line Items]        
Beginning Balance, Carrying amount 59,990,000   0  
Acquisition of equity investment   0 60,439,000  
Company's share of net loss of associates   1,406   449
Ending Balance, Carrying amount 58,584,000 58,584 59,990,000  
UMS [Member]        
Statement [Line Items]        
Beginning Balance, Carrying amount 0   0  
Acquisition of equity investment   151 0  
Company's share of net loss of associates   (35)   $ 0
Ending Balance, Carrying amount $ 116,000 $ 116 $ 0