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SELECTED QUARTERLY FINANCIAL DATA (Unaudited) (Details) - Quarterly Financial Information - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014
Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,636 | $ 1,330 | $ 1,289 | $ 1,250 | $ 1,458 | $ 1,389 | $ 1,858 | $ 2,628 | $ 5,505 | $ 7,333 | $ 8,534
Loss from continuing operations before income taxes | (251) | (392) | (2,187) | (861) | (1,259) | (922) | (784) | (108) | (3,691) | (3,073) | (1,112)
Tax expense (benefit) | (1) | (16) | 0 | 11 | 800 | 26 | 3 | (7) | (6) | 822 | (475)
Loss from continuing operations | (250) | (376) | (2,187) | (872) | (2,059) | (948) | (787) | (101) | (3,685) | (3,895) | (637)
Income (loss) from discontinued operations | 0 | 0 | (25) | 7 | 7 | (46) | (54) | 12 | (18) | (81) | (326)
Net loss | (250) | (376) | (2,212) | (865) | (2,052) | (994) | (841) | (89) | (3,703) | (3,976) | (963)
Net income (loss) attributable to non-controlling interest | (5) | (26) | 0 | 3 | 1 | 13 | 1 | 39 | (28) | 54 | 7
Net loss attributable to U.S. Global Investors, Inc. | (245) | (350) | (2,212) | (868) | (2,053) | (1,007) | (842) | (128) | (3,675) | (4,030) | (970)
Comprehensive income (loss) | (348) | 148 | (1,592) | (1,577) | (2,061) | (1,225) | (1,587) | (632) | (3,369) | (5,505) | (707)
Comprehensive income (loss) attributable to U.S. Global Investors, Inc. | $ (348) | $ 115 | $ (1,575) | $ (1,533) | $ (2,076) | $ (1,177) | $ (1,562) | $ (604) | $ (3,341) | $ (5,419) | $ (716)
Basic |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations (in Dollars per share) | $ (0.02) | $ (0.02) | $ (0.14) | $ (0.06) | $ (0.13) | $ (0.06) | $ (0.05) | $ (0.01) | $ (0.24) | $ (0.25) | $ (0.04)
Loss from discontinued operations (in Dollars per share) | 0 | 0 | 0 | 0 | 0 | (0.01) | 0 | 0 | 0 | (0.01) | (0.02)
Net loss attributable to U.S. Global Investors, Inc. (in Dollars per share) | (0.02) | (0.02) | (0.14) | (0.06) | (0.13) | (0.07) | (0.05) | (0.01) | (0.24) | (0.26) | (0.06)
Diluted |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations (in Dollars per share) | (0.02) | (0.02) | (0.14) | (0.06) | (0.13) | (0.06) | (0.05) | (0.01) | (0.24) | (0.25) | (0.04)
Loss from discontinued operations (in Dollars per share) | 0 | 0 | 0 | 0 | 0 | (0.01) | 0 | 0 | 0 | (0.01) | (0.02)
Net loss attributable to U.S. Global Investors, Inc. (in Dollars per share) | $ (0.02) | $ (0.02) | $ (0.14) | $ (0.06) | $ (0.13) | $ (0.07) | $ (0.05) | $ (0.01) | $ (0.24) | $ (0.26) | $ (0.06)

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