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Document and Entity Information (USD $)	12 Months Ended
	Jun. 30, 2013	Aug. 14, 2013 Common Class A [Member]	Dec. 31, 2012 Common Class A [Member]	Aug. 14, 2013 Common Class B [Member]	Aug. 14, 2013 Common Class C [Member]	Dec. 31, 2012 Common Class C [Member]
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Trading Symbol	GROW
Entity Registrant Name	U S GLOBAL INVESTORS INC
Entity Central Index Key	0000754811
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		13,401,843		0	2,070,527
Entity Public Float			$ 37,959,791.00			$ 1,974.75

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