DISCONTINUED OPERATIONS (Details) - Disposal Groups, Including Discontinued Operations - Discontinued Operations [Member] - Galileo [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Revenues
Revenues	$ 0	$ 50	$ 0	$ 235
Expenses
Employee compensation and benefits	0	23	0	77
General and administrative	0	125	0	508
Depreciation and amortization	0	1	0	6
	0	149	0	591
Other Income (Loss)
Investment income	0	21	0	24
Other income	0	(7)	0	(6)
	0	14	0	18
Loss from discontinued operations of investment management services in Canada before income taxes	0	(85)	0	(338)
Tax expense (benefit)	0	0	0	0
Loss from discontinued operations of investment management services in Canada	0	(85)	0	(338)
Less: net loss attributable to non-controlling interest from discontinued operations	0	(30)	0	(118)
Net loss attributable to U.S. Global Investors, Inc. from discontinued operations of investment management services in Canada	$ 0	$ (55)	$ 0	$ (220)