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Taxes - Significant components of deferred tax assets (Details) - USD ($)
Jun. 30, 2025
Jun. 30, 2024
Operating Loss Carryforwards [Line Items]    
Valuation allowance $ (6,534,073) $ (6,500,758)
UNITED STATES    
Operating Loss Carryforwards [Line Items]    
Deferred tax assets 6,480,712 6,408,628
CANADA    
Operating Loss Carryforwards [Line Items]    
Deferred tax assets $ 53,361 53,134
SINGAPORE    
Operating Loss Carryforwards [Line Items]    
Deferred tax assets   $ 38,996