Document and Entity Information	9 Months Ended
	Mar. 31, 2015	May 05, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	GROW
Entity Registrant Name	U S GLOBAL INVESTORS INC
Entity Central Index Key	0000754811
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		13,312,314
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0
Common Class C
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,069,127