XML 10 R1.htm IDEA: XBRL DOCUMENT v3.6.0.2
Document And Entity Information - shares
 6 Months Ended
Dec. 31, 2016
Jan. 27, 2017
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 Dec. 31, 2016  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
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   2,068,947
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   13,133,787