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Accounting policies (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Cash and cash equivalents | $ 5,100,000 |  | $ 5,100,000 |  | $ 5,000,000.0
Deposits held in foreign bank | 5,100,000 |  | 5,100,000 |  |
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 22,077,000 | $ (8,068,000) | $ 72,253 | $ 20,966 |
Bahamas [Member] |  |  |  |  |
Deposits held in foreign bank |  |  |  |  | $ 5,700,000

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