RESTATEMENT OF UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS (Details) - Schedule of Error Corrections and Prior Period Adjustments - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Operating Revenues
Other operating revenue	$ 0	$ 0	$ 444	$ 0
Total operating revenue	6,355	914	14,321	2,605
Operating Expenses
Employee compensation and benefits	1,442	715	5,642	2,060
General and administrative	1,528	1,091	4,066	2,440
Advertising	44	37	162	111
Depreciation and amortization	49	50	147	152
	3,063	1,893	10,017	4,763
Operating Income (Loss)	3,292	(979)	4,304	(2,158)
Other Income (Loss)
Investment income	8,424	(441)	30,124	(3,922)
Income (loss) from equity method investments	(64)	(91)	420	(146)
Gain on forgiveness of PPP loan	0	0	444	0
Other income	33	29	92	90
	8,393	(503)	31,080	(3,978)
Income from Continuing Operations Before Income Taxes	11,685	(1,482)	35,384	(6,136)
Provision for Income Taxes
Tax expense (benefit)	3,078	75	8,172	(174)
Net Income	8,607	(1,642)	27,212	(6,300)
Net Income Attributable to U.S. Global Investors, Inc.	$ 8,607	$ (1,612)	$ 27,212	$ (6,182)
Earnings Per Share Attributable to U.S. Global Investors, Inc.
Net income (in Dollars per share)	$ 0.57	$ (0.11)	$ 1.81	$ (0.41)
Net income (in Dollars per share)	$ 0.57	$ (0.11)	$ 1.81	$ (0.41)
Basic weighted average number of common shares outstanding (in Shares)	15,061,818	15,121,950	15,075,064	15,127,118
Diluted weighted average number of common shares outstanding (in Shares)	15,062,988	15,121,950	15,075,795	15,127,118
Investment Advisory Services [Member]
Operating Revenues
Revenues	$ 6,304	$ 875	$ 14,168	$ 2,477
Administrative Service [Member]
Operating Revenues
Revenues	51	$ 39	153	128
Other Operating Revenue [Member]
Operating Revenues
Other operating revenue	0		0
Other Income (Loss)
Gain on forgiveness of PPP loan	0		0
Previously Reported [Member]
Operating Revenues
Other operating revenue			444
Total operating revenue	6,355		14,765
Operating Expenses
Employee compensation and benefits	1,382		5,582
General and administrative	1,528		4,066
Advertising	44		162
Depreciation and amortization	49		147
	3,003		9,957
Operating Income (Loss)	3,352		4,808
Other Income (Loss)
Investment income	15,505		37,205
Income (loss) from equity method investments	(64)		420	(146)
Gain on forgiveness of PPP loan			444
Other income	33		92
	15,474		37,717
Income from Continuing Operations Before Income Taxes	18,826		42,525
Provision for Income Taxes
Tax expense (benefit)	4,602		9,696
Net Income	14,224		32,829	(6,300)
Net Income Attributable to U.S. Global Investors, Inc.	$ 14,224		$ 32,829
Earnings Per Share Attributable to U.S. Global Investors, Inc.
Net income (in Dollars per share)	$ 0.94		$ 2.18
Net income (in Dollars per share)	$ 0.94		$ 2.18
Basic weighted average number of common shares outstanding (in Shares)	15,061,818		15,075,064
Diluted weighted average number of common shares outstanding (in Shares)	15,062,988		15,075,795
Previously Reported [Member] | Investment Advisory Services [Member]
Operating Revenues
Revenues	$ 6,304		$ 14,168
Previously Reported [Member] | Administrative Service [Member]
Operating Revenues
Revenues	51		153
Previously Reported [Member] | Other Operating Revenue [Member]
Operating Revenues
Other operating revenue	0		444
Other Income (Loss)
Gain on forgiveness of PPP loan	0		444
Revision of Prior Period, Adjustment [Member]
Operating Revenues
Other operating revenue			0
Total operating revenue	0		0
Operating Expenses
Employee compensation and benefits	60		60
General and administrative	0		0
Advertising	0		0
Depreciation and amortization	0		0
	60		60
Operating Income (Loss)	(60)		(60)
Other Income (Loss)
Investment income	(7,081)		(7,081)
Income (loss) from equity method investments	0		0
Gain on forgiveness of PPP loan			0
Other income	0		0
	(7,081)		(7,081)
Income from Continuing Operations Before Income Taxes	(7,141)		(7,141)
Provision for Income Taxes
Tax expense (benefit)	(1,524)		(1,524)
Net Income	(5,617)		(5,617)
Net Income Attributable to U.S. Global Investors, Inc.	$ (5,617)		$ (5,617)
Earnings Per Share Attributable to U.S. Global Investors, Inc.
Net income (in Dollars per share)	$ (0.37)		$ (0.37)
Net income (in Dollars per share)	$ (0.37)		$ (0.37)
Revision of Prior Period, Adjustment [Member] | Investment Advisory Services [Member]
Operating Revenues
Revenues	$ 0		$ 0
Revision of Prior Period, Adjustment [Member] | Administrative Service [Member]
Operating Revenues
Revenues	0		0
Revision of Prior Period, Adjustment [Member] | Other Operating Revenue [Member]
Operating Revenues
Other operating revenue	0		0
Other Income (Loss)
Gain on forgiveness of PPP loan	0		0
Revision of Prior Period, Reclassification, Adjustment [Member]
Operating Revenues
Other operating revenue	444		0
Total operating revenue			(444)
Operating Expenses
Employee compensation and benefits			0
General and administrative			0
Advertising			0
Depreciation and amortization			0
			0
Operating Income (Loss)			(444)
Other Income (Loss)
Investment income			0
Income (loss) from equity method investments			0	0
Gain on forgiveness of PPP loan	444		0
Other income			0
			444
Income from Continuing Operations Before Income Taxes			0
Provision for Income Taxes
Tax expense (benefit)			0
Net Income			0	$ 0
Net Income Attributable to U.S. Global Investors, Inc.			$ 0
Earnings Per Share Attributable to U.S. Global Investors, Inc.
Net income (in Dollars per share)			$ 0
Net income (in Dollars per share)			$ 0
Revision of Prior Period, Reclassification, Adjustment [Member] | Investment Advisory Services [Member]
Operating Revenues
Revenues			$ 0
Revision of Prior Period, Reclassification, Adjustment [Member] | Administrative Service [Member]
Operating Revenues
Revenues			0
Revision of Prior Period, Reclassification, Adjustment [Member] | Other Operating Revenue [Member]
Operating Revenues
Other operating revenue			(444)
Other Income (Loss)
Gain on forgiveness of PPP loan			(444)
Revision of Prior Period, Reclassification, Adjustment [Member]
Operating Revenues
Other operating revenue	0		444
Other Income (Loss)
Gain on forgiveness of PPP loan	0		444
Revision of Prior Period, Reclassification, Adjustment [Member] | Previously Reported [Member]
Operating Revenues
Other operating revenue	0		0
Other Income (Loss)
Gain on forgiveness of PPP loan	0		0
Revision of Prior Period, Reclassification, Adjustment [Member] | Revision of Prior Period, Adjustment [Member]
Operating Revenues
Other operating revenue	0		0
Other Income (Loss)
Gain on forgiveness of PPP loan	$ 0		0
Revision of Prior Period, Reclassification, Adjustment [Member] | Revision of Prior Period, Reclassification, Adjustment [Member]
Operating Revenues
Other operating revenue			444
Other Income (Loss)
Gain on forgiveness of PPP loan			$ 444