Document And Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2016	Sep. 02, 2016	Dec. 31, 2015
Document Information [Line Items]
Entity Registrant Name	U S GLOBAL INVESTORS INC
Document Type	10-K
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	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
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
Entity Public Float			$ 1,142
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		13,170,616
Entity Public Float			$ 9,011,941