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Accounting policies - Foreign Currency (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Foreign currency |  |  |  |  |
Net foreign currency gains | $ 16,345 | $ 16,602 | $ 45,987 | $ 40,799 |
Cash and cash equivalents |  |  |  |  |
Cash and cash equivalents | 16,900,000 |  | 16,900,000 |  | $ 5,200,000
Deposits held in foreign bank | $ 14,200,000 |  | $ 14,200,000 |  | $ 7,700,000

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