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Income taxes (Details - Reconciliation of effective income tax rate)
3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]    
Federal 21.00% 21.00%
State (net of federal benefit) 5.51% 5.82%
Foreign tax rate difference (3.16%) (4.88%)
Net effect of state income tax deduction and other permanent differences 0.50% (4.31%)
Effective tax rate 23.85% 17.63%