Document And Entity Information - shares	3 Months Ended
	Sep. 30, 2022	Oct. 28, 2022
Document Information [Line Items]
Entity Central Index Key	0000754811
Entity Registrant Name	U S GLOBAL INVESTORS INC
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2023
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	0-13928
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	74-1598370
Entity Address, Address Line One	7900 Callaghan Road
Entity Address, City or Town	San Antonio
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78229
City Area Code	210
Local Phone Number	308-1234
Title of 12(b) Security	Class A common stock
Trading Symbol	GROW
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,068,549
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		12,836,542