XML 71 R1.htm IDEA: XBRL DOCUMENT v3.2.0.727
Document and Entity Information - USD ($)
12 Months Ended
Jun. 30, 2015
Sep. 04, 2015
Dec. 31, 2014
Entity Information [Line Items]      
Entity Registrant Name U S GLOBAL INVESTORS INC    
Trading Symbol GROW    
Entity Central Index Key 0000754811    
Current Fiscal Year End Date --06-30    
Entity Filer Category Non-accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 30, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Common Class A [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   13,264,590  
Entity Public Float     $ 25,326,808
Common Class B [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   0  
Common Class C [Member]      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   2,069,127  
Entity Public Float     $ 1,142