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Accounting policies (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Cash and cash equivalents | $ 5,100,000 |  | $ 5,100,000 |  | $ 7,400,000
Deposits held in foreign bank | 10,100,000 |  | 10,100,000 |  |
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ 24,397,000 | $ 6,988,000 | $ 50,176 | $ 29,034 |
Bahamas [Member] |  |  |  |  |
Deposits held in foreign bank |  |  |  |  | $ 5,700,000

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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