| Document And Entity Information | Dec. 19, 2023 |
| Document Information [Line Items] | |
| Entity, Registrant Name | U.S. GLOBAL INVESTORS, INC. |
| Document, Type | 8-K |
| Document, Period End Date | Dec. 19, 2023 |
| Entity, Incorporation, State or Country Code | TX |
| Entity, File Number | 0-13928 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock |
| Trading Symbol | GROW |
| Security Exchange Name | NASDAQ |
| Entity, Emerging Growth Company | false |
| Amendment Flag | false |
| Entity, Central Index Key | 0000754811 |
