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Income taxes (Details Narrative) - USD ($)
Dec. 31, 2023
Jun. 30, 2023
Operating Loss Carryforwards [Line Items]    
Valuation allowance $ 66,104 $ (0)
U S Tax Authorities [Member]    
Operating Loss Carryforwards [Line Items]    
Prepaid taxes 41,987 45,718
Chinese Tax Authorities [Member]    
Operating Loss Carryforwards [Line Items]    
Prepaid taxes $ 283,519 $ 276,683