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Material accounting policies - Going concern (Details) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Material accounting policies      
Profit (loss) from continuing operations $ 1,314,256 $ (11,065,062) $ 13,132,766
Profit or (Loss) for the year 1,312,722 (10,269,693) 3,056,476
Accumulated losses (338,532,319) (339,845,041)  
negative operating cash flows $ (2,138,865) $ (3,565,317) $ (9,105,229)