EARNINGS PER SHARE - Computation for Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Loss from continuing operations	$ (994)	$ (26)	$ (1,925)	$ (993)
Less: Income attributable to non-controlling interest in subsidiary	13	0	53	0
Loss from continuing operations attributable to U.S. Global Investors, Inc.	(1,007)	(26)	(1,978)	(993)
Loss from discontinued operations attributable to U.S. Global Investors, Inc.	0	(2)	0	(238)
Net Loss Attributable to U.S. Global Investors, Inc.	$ (1,007)	$ (28)	$ (1,978)	$ (1,231)
Weighted average number of outstanding shares, Basic (in shares)	15,379,365	15,454,932	15,406,189	15,466,280
Effect of dilutive securities
Employee stock options (in shares)	0	0	0	0
Diluted (in shares)	15,379,365	15,454,932	15,406,189	15,466,280
Basic
Loss from continuing operations (in dollars per share)	$ (0.07)	$ 0.00	$ (0.13)	$ (0.06)
Loss from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.02)
Net loss (in dollars per share)	$ (0.07)	$ 0.00	$ (0.13)	$ (0.08)
Diluted
Loss from continuing operations (in dollars per share)	$ (0.07)	$ 0.00	$ (0.13)	$ (0.06)
Loss from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ (0.02)
Net loss (in dollars per share)	$ (0.07)	$ 0.00	$ (0.13)	$ (0.08)