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Income taxes (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Effective Income Tax Rate Reconciliation [Line Items]          
Effective income tax rate     $ 0 $ 0 $ 0
Goodwill $ 3,034,110   3,034,110   3,034,110
Income Tax Expense (Benefit) $ 26,017 $ 377,147 $ (489,984) $ (587,674)  
Effective Income Tax Rate Reconciliation, Percent (8.22%) 27.14% 18.50% 21.12%  
Valuation allowance     $ 47,248 $ 64,990  
US Tax Authorities [Member]          
Effective Income Tax Rate Reconciliation [Line Items]          
Accrued Income Taxes $ 401   401   31,496
Chinese Tax Authorities [Member]          
Effective Income Tax Rate Reconciliation [Line Items]          
Accrued Income Taxes 278,368   278,368   $ 276,158
GILTI [Member]          
Effective Income Tax Rate Reconciliation [Line Items]          
Goodwill $ 6,094,144   $ 6,094,144