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Cash and cash equivalents - Purpose of the consolidated statement of cash flow (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash and cash equivalents.      
Cash at banks and on hand attributable to continued operations $ 4,414,456 $ 4,958,983 $ 2,922,755
Cash at banks and on hand attributable to discontinued operations   1,522 1,261
Cash and cash equivalents including discontinued operations $ 4,414,456 $ 4,960,505 $ 2,924,016