Note 3 - Investment Management and Other Fees (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022
Fund Clients [Member]
Receivables, Net, Current, Total	$ 1,300,000		$ 1,300,000		$ 1,600,000
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	1,200,000		$ 1,200,000		1,400,000
U S Global Jets U C I T S E T F [Member]
Unitary Management Fee, Percentage of Average Net Assets			0.65%
U S Global Investors Funds [Member]
Aggregate Fees Waived and Expenses Borne	303,000	$ 161,000	$ 523,000	$ 319,000
Annual Administrative Fee Rate			0.05%
U S Global Investors Funds [Member] | Fund Clients [Member]
Receivables, Net, Current, Total	$ 150,000		$ 150,000		$ 188,000
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%		0.25%
Investment Advisory Fees, Fee Adjustment Percent, Minimum Performance to Designed Benchmark Over Prior Rolling 12 Months	5.00%		5.00%