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Document And Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2024
Aug. 21, 2024
Dec. 31, 2023
Document Information [Line Items]      
Entity Central Index Key 0000754811    
Entity Registrant Name U S GLOBAL INVESTORS INC    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jun. 30, 2024    
Document Transition Report false    
Entity File Number 0-13928    
Entity Incorporation, State or Country Code TX    
Entity Tax Identification Number 74-1598370    
Entity Address, Address Line One 7900 Callaghan Road    
Entity Address, City or Town San Antonio    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 78229    
City Area Code 210    
Local Phone Number 308-1234    
Title of 12(b) Security Class A common stock, $0.025 par value per share    
Trading Symbol GROW    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] true    
Entity Shell Company false    
Entity Public Float     $ 30,569,415
Entity Common Stock, Shares Outstanding   11,612,094  
Auditor Name Grant Thornton LLP    
Auditor Location Dallas, Texas    
Auditor Firm ID 248