Note 5 - Investment Management and Other Fees (Details Textual) - USD ($)	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Investment Advisory Fees, Fee Adjustment Percent, Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months	5.00%
Fund Clients [Member]
Receivables, Net, Current, Total	$ 1,600,000	$ 2,400,000
U S Global Investors Funds [Member]
Aggregate Fees Waived and Expenses Borne	$ 667,000	701,000
Annual Administrative Fee Rate	0.05%
U S Global Investors Funds [Member] | Fund Clients [Member]
Receivables, Net, Current, Total	$ 188,000	432,000
U S Global Investors Funds [Member] | Equity Funds [Member]
Investment Advisory Fees, Fee Adjustment Base Percentage Adjustment When Fund Performance is Not Within Limits to Benchmark Index	0.25%
Investment Advisory Fees, Fee Adjustment Percent, Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months	5.00%
U S Global E T Fs [Member]
Unitary Management Fee, Percentage of Average Net Assets	0.60%
U S Global E T Fs [Member] | Fund Clients [Member]
Receivables, Net, Current, Total	$ 1,400,000	$ 2,000,000.0
U S Global Jets U C I T S E T F [Member]
Unitary Management Fee, Percentage of Average Net Assets	0.65%