| 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 |
