| Document And Entity Information | Feb. 17, 2022 |
| Document Information Line Items | |
| Entity Registrant Name | U.S. GLOBAL INVESTORS, INC. |
| Trading Symbol | GROW |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0000754811 |
| Document Period End Date | Feb. 17, 2022 |
| Entity Emerging Growth Company | false |
| 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, $0.25 par value per share |
| Security Exchange Name | NASDAQ |
