Document And Entity Information - shares	3 Months Ended
	Sep. 30, 2016	Oct. 27, 2016
Document Information [Line Items]
Entity Registrant Name	U S GLOBAL INVESTORS INC
Document Type	10-Q
Current Fiscal Year End Date	--06-30
Amendment Flag	false
Entity Central Index Key	0000754811
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,069,127
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		13,153,506