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Note 12 - Financial Information by Business Segment (Details Textual) | 3 Months Ended
--- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($)
Revenue from Contract with Customer, Including Assessed Tax | $ 2,251,000 | $ 2,157,000
Number of Reportable Segments | 2 |
Investment Management Services [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 2,251,000 | 2,157,000
Investment Management Services [Member] | U S Global E T Fs [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,500,000 | 1,800,000
Investment Management Services [Member] | U S Global Investors Funds [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 727,000 | $ 393,000

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