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Note 3 - Investment Management and Other Fees - Operating Revenues Disaggregated by Performance Obligation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Revenue from Contract with Customer, Including Assessed Tax | $ 2,251 | $ 2,157
Investment And Advisory Services [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,209 | 2,127
Investment And Advisory Services [Member] | U S Global E T Fs [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,524 | 1,764
Investment And Advisory Services [Member] | U S Global Investors Funds [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 685 | 466
Investment Performance [Member] | U S Global Investors Funds [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 0 | (103)
Administrative Service [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | 42 | 30
Administrative Service [Member] | U S Global Investors Funds [Member] |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 42 | $ 30

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