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Note 13 - Financial Information by Business Segment (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Revenue from Contract with Customer, Including Assessed Tax $ 2,593,000 $ 3,624,000 $ 8,544,000 $ 11,764,000
Investment Management Services [Member]        
Revenue from Contract with Customer, Including Assessed Tax 2,593,000 3,624,000 8,544,000 11,764,000
Investment Management Services [Member] | U S Global E T Fs [Member]        
Revenue from Contract with Customer, Including Assessed Tax 2,200,000 3,100,000 7,400,000 10,400,000
Investment Management Services [Member] | U S Global Investors Funds [Member]        
Revenue from Contract with Customer, Including Assessed Tax $ 369,000 $ 482,000 $ 1,200,000 $ 1,400,000