Document And Entity Information - shares
6 Months Ended
Dec. 31, 2017
Jan. 29, 2018
Document Information [Line Items]  
Entity Registrant NameU S GLOBAL INVESTORS INC 
Document Type10-Q 
Current Fiscal Year End Date--06-30 
Amendment Flagfalse 
Entity Central Index Key0000754811 
Entity Current Reporting StatusYes 
Entity Voluntary FilersNo 
Entity Filer CategorySmaller Reporting Company 
Entity Well-known Seasoned IssuerNo 
Document Period End DateDec. 31, 2017 
Document Fiscal Year Focus2018 
Document Fiscal Period FocusQ2 
Common Class A [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 13,074,270
Common Class C [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 2,068,857
Common Class B [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 0

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