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Taxes - Loss before provision for income taxes (Details) - USD ($)
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Taxes        
Loss before provision for income taxes $ (4,369,906) $ (18,284,958) $ (28,216,352) $ (28,216,352)
CAYMAN ISLANDS        
Taxes        
Loss before provision for income taxes (4,228,125) (8,833,523) (6,034,362)  
SINGAPORE        
Taxes        
Loss before provision for income taxes   (49,158) (155,373)  
CANADA        
Taxes        
Loss before provision for income taxes (1,508) (349,960) (1,998)  
UNITED STATES        
Taxes        
Loss before provision for income taxes $ (140,273) $ (9,052,317) $ (22,024,619)