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Business Combination - Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Business Combinations [Abstract] |  |  |
Operating revenues | $ 13,771 | $ 20,234 | $ 25,229
Net income (loss) | (856) | (13) | 1,475
Net income (loss) attributable to U.S. Global Investors, Inc. | $ (916) | $ (99) | $ 1,484
Income (loss) from continuing operations - basic (in dollars per share) | $ (0.04) | $ 0.00 | $ 0.11
Income (loss) from continuing operations - diluted (in dollars per share) | $ (0.04) | $ 0.00 | $ 0.11

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