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Income tax (Schedule of Expiring Dates for Tax Losses) (Details) | Dec. 31, 2021 USD ($)
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2022 |
Disclosure Of Income tax [Line Items] |
Taxable losses | $ 646,000
2023 |
Disclosure Of Income tax [Line Items] |
Taxable losses | 1,715,000
2024 |
Disclosure Of Income tax [Line Items] |
Taxable losses | 8,211,000
2025 |
Disclosure Of Income tax [Line Items] |
Taxable losses | 5,671,000
2026 |
Disclosure Of Income tax [Line Items] |
Taxable losses | $ 19,530,000

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