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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%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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