Document And Entity Information	12 Months Ended
	Jun. 30, 2022	Aug. 19, 2022 shares	Dec. 31, 2021 USD ($)
Document Information [Line Items]
Entity Central Index Key	0000754811
Entity Registrant Name	U S GLOBAL INVESTORS INC
Amendment Flag	true
Current Fiscal Year End Date	--06-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Document Type	10-K/A
Amendment Description	Restatement of Consolidated Financial Statements   We have restated our consolidated financial statements as of June 30, 2022, and for the year then ended in order to correct certain fair value measurements related to our investment in HIVE Blockchain Technologies, Ltd. (“HIVE”) common share purchase warrants and our investment in HIVE unsecured convertible debentures. For a discussion of the valuation, the adjusted fair value measurement, and the impact of the restatement adjustment on the consolidated financial statements as of June 30, 2022, and for the year then ended, see Note 1 of Notes to Consolidated Financial Statements included in Part II, Item 8 — Financial Statements and Supplementary Data.   Internal Control Over Financial Reporting   Management reassessed its evaluation of the effectiveness of the Company’s internal control over financial reporting as of June 30, 2022, and concluded that a deficiency in the design and operating effectiveness of the internal controls represented a material weakness in the internal control over financial reporting and, therefore, the Company did not maintain effective internal control over financial reporting as of June 30, 2022. For a description of the material weakness identified by management and management’s plan to remediate the material weakness, see Part II, Item 9A — Controls and Procedures.   Amended Reports   This Amended Annual Report on Form 10-K/A-2 does not reflect events occurring after the original filing date of September 1, 2022, and does not modify or update disclosures in the original filing that may have been affected by subsequent events, except for the effects of the restatement described in Note 1 of Notes to Consolidated Financial Statements included in Part II, Item 8 — Financial Statements and Supplementary Data. Other disclosures not affected by the restatement are unchanged and reflect the disclosures made at the time of original filing.   This Amended Annual Report on Form 10-K/A-2 reflects amendments to the following items:    ●    Part I, Item 1A — Risk Factors      ●    Part II, Item 7 — Management's Discussion and Analysis of Financial Condition and Results of Operations      ●    Part II, Item 7A — Quantitative and Qualitative Disclosures about Market Risk      ●    Part II, Item 8 — Financial Statements and Supplementary Data      ●    Part II, Item 9A — Controls and Procedures      ●    Part IV, Item 15 — 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-2. See Exhibits 31.1 and 32.1.
Document Annual Report	true
Document Period End Date	Jun. 30, 2022
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	No
Entity Interactive Data Current	No
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 Recovery Analysis [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
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		2,068,549
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		12,884,169
Maximum [Member]
Document Information [Line Items]
Entity Number of Employees	25