Note 16 - Financial Information by Business Segment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax	$ 24,714	$ 21,654
Investment Management Services [Member]
Revenue from Contract with Customer, Including Assessed Tax	24,714	21,654
Investment Management Services [Member] | U S Global Investors Funds [Member]
Revenue from Contract with Customer, Including Assessed Tax	3,800	4,500
Investment Management Services [Member] | U S Global E T Fs [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 21,000	$ 17,100