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Operating expenses, Compensation of Executives and Directors (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Compensation of Directors and Executives [Abstract]      
Cash compensation $ 2,648 $ 5,050 $ 3,897
Pension cost 165 219 206
Share compensation [1] 3,316 3,508 4,364
Total remuneration $ 6,129 $ 8,776 $ 8,466
[1]     Share compensation reflects the expense recognized.