Accounting policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Cash and cash equivalents	$ 5,200		$ 5,200		$ 5,100
Deposits held in foreign bank	11,400		11,400
Foreign Currency Transaction Gain (Loss), before Tax [Abstract]
Foreign Currency Transaction Gain (Loss), before Tax	$ 24,807	$ 22,077	$ 65,606	$ 72,253
Bahamas [Member]
Deposits held in foreign bank					$ 3,000