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Taxation - Other (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Taxation      
Income tax expense $ (249,000) $ (157,000) $ (43,000)
Tax loss carryforwards 5,900,000 $ 5,747,000 $ 5,218,000
NL      
Taxation      
Income tax expense $ 0