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Document And Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2023
Nov. 08, 2023
Dec. 31, 2022
Document Information [Line Items]      
Entity, Registrant Name U S GLOBAL INVESTORS INC    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Jun. 30, 2023    
Current Fiscal Year End Date --06-30    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2023    
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    
Auditor Name Grant Thornton LLP    
Auditor Location Dallas, Texas    
Auditor Firm ID 248    
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 false    
Entity, Shell Company false    
Entity, Public Float     $ 35,084,380
Amendment Description We are filing this Amendment No. 1 (this “Amendment”) to our Annual Report on Form 10-K for the year ended June 30, 2023, as filed with the Securities and Exchange Commission on November 16, 2023 (the “Original Form 10-K”). The purpose of this amendment is to include a previously omitted discussion of changes in accountants, and to amend the Consent of BDO USA, LLP, to reflect the name BDO USA, P.C. (formerly BDO USA, LLP).   In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”),  Item 9 of Part II and Item 15(a)3 of Part IV of the Original Form 10-K is hereby amended and restated in its entirety.  In addition, as required by the Exchange Act, new certifications by our principal executive officer and principal financial officer are filed herewith as exhibits to this Amendment pursuant to Rule 13a-14(a) of the Exchange Act.   Except as described above, no other changes have been made to the Original Form 10-K, and this Amendment does not amend, update, or change any other items or disclosures in the Original Form 10-K. This Amendment does not reflect subsequent events occurring after the filing date of the Original Form 10-K or modify or update in any way disclosures in the Original Form 10-K.   This Amended Annual Report on Form 10-K/A reflects amendments to the following items: • Part II, Item 9 — Changes in and Disagreements with Accountants on Accounting and Financial Disclosure • Part IV, Item 15 (a) 3 — Exhibits   The Company's Chief Executive Officer and Chief Financial Officer are providing currently dated certifications in connection with this Amended Annual Report on Form 10-K/A. See Exhibit 31.2.    
Amendment Flag true    
Entity, Central Index Key 0000754811    
Common Class A [Member]      
Document Information [Line Items]      
Entity, Common Stock Shares, Outstanding   12,240,786  
Common Class C [Member]      
Document Information [Line Items]      
Entity, Common Stock Shares, Outstanding   2,068,549