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Intangible asset (Tables)
12 Months Ended
Dec. 31, 2024
Intangible asset [Abstract]  
Reconciliation of carrying amount of intangible assets
2024
2023
Cost
Beginning of year
$118,819
$118,819
End of year
118,819
118,819
Accumulated amortization
Beginning of year
75,242
71,758
Amortization charge
3,755
3,484
End of year
78,997
75,242
Net book value at December 31
$39,822
$43,577