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Document And Entity Information - USD ($)
Jun. 30, 2022
Aug. 19, 2022
Dec. 31, 2021
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, 2022    
Current Fiscal Year End Date --06-30    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2021    
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    
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    
Entity, Shell Company false    
Entity, Public Float     $ 51,433,655
Auditor Name BDO USA, LLP    
Auditor Location Dallas, Texas    
Auditor Firm ID 243    
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, 2022, as filed with the Securities and Exchange Commission on September 1, 2022 (the “Original Form 10-K”). The purpose of this Amendment is to correct the shares of registrant's class A nonvoting common stock issued and outstanding and the shares of registrant's class C voting common stock issued and outstanding number as of August 19, 2022, on the cover page and within Item 12.   In accordance with Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Item 9A of Part II, Item 12 of Part III, 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:   • Cover Page • Part II, Item 9A — Controls and Procedures • Part III, Item 12 — Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters • 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   12,884,169  
Common Class C [Member]      
Document Information [Line Items]      
Entity, Common Stock Shares, Outstanding   2,068,549