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Income taxes (Details - Reconcilation of effective income tax rate)
3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]        
Federal 21.00% 21.00% 21.00% 21.00%
State 5.82% 5.85% 5.82% 5.85%
Foreign tax rate difference 0.35% (0.33%) 0.20% 1.86%
Impairment loss on goodwill -permanent difference 0.00% 0.00% 0.00% (9.32%)
Net effect of state income tax deduction and other permanent differences (0.74%) (2.38%) (3.89%) (2.72%)
Effective tax rate 26.43% 24.14% 23.13% 16.67%