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INVESTMENTS (Details) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Jun. 30, 2017 USD ($)
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Fair value of investments held |  | $ 29,805 |  | $ 29,805 |  | $ 13,121
Cost basis of investments held |  | $ 12,634 |  | $ 12,634 |  | 13,588
Market value of investments to Company's total assets |  | 66.10% |  | 66.10% |  |
Other investments |  | $ 2,109 |  | $ 2,109 |  | 2,130
Equity Method Investments |  | 3,252 |  | 3,252 |  | 0
Available-for-sale, net unrealized gain (loss), gross |  | 17,353 |  | 17,353 |  | 461
Available-for-sale, net unrealized gain (loss), net of tax |  | 13,847 |  | 13,847 |  | 461
Other-than-temporary impairments |  | 0 | $ 0 | 0 | $ 16 |
Available-for-sale securities, fair value | [1],[2] | 22,372 |  | 22,372 |  | 3,401
Trading Securities | [2] | 7,433 |  | 7,433 |  | 9,720
Income (Loss) from Equity Method Investments |  | 1,218 | $ 0 | 2,731 | $ 0 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Fair value of investments held |  | $ 9,002 |  | $ 9,002 |  | $ 12,706
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value |  | 30.00% |  | 30.00% |  | 100.00%
Available-for-sale securities, fair value |  | $ 1,569 |  | $ 1,569 |  | $ 3,401
Trading Securities |  | 7,433 |  | 7,433 |  | 9,305
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Fair value of investments held |  | $ 20,803 |  | $ 20,803 |  | 0
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value |  | 70.00% |  | 70.00% |  |
Available-for-sale securities, fair value |  | $ 20,803 |  | $ 20,803 |  | 0
Trading Securities |  | 0 |  | 0 |  | 0
U.S. Global Investors Funds [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Investments, Fair Value Disclosure |  | $ 8,800 |  | $ 8,800 |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Investment Owned, Direct, Percentage |  | 3.30% |  | 3.30% |  |
Investment Owned, Percentage |  | 4.00% |  | 4.00% |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Available-for-sale securities, fair value |  | $ 19,100 |  | $ 19,100 |  |
Offshore Fund [Member] | Net Asset Value Per Share [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Trading Securities |  |  |  |  |  | 415
Galileo Partners Fund [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Method Investments |  | 3,300 |  | 3,300 |  |
Equity Method Investment, Aggregate Cost |  | $ 500 |  | $ 500 |  |
Equity Method Investment, Ownership Percentage |  | 30.00% |  | 30.00% |  |
Income (Loss) from Equity Method Investments |  | $ 1,200 |  | $ 2,700 |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Available-for-sale securities, fair value | [2],[3] | 1,703 |  | 1,703 |  | 1,469
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Available-for-sale securities, fair value |  | 0 |  | 0 |  | 1,469
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Available-for-sale securities, fair value |  | $ 1,703 |  | $ 1,703 |  | $ 0
Impaired Securities [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Number of positions, subject to impairment loss |  |  |  |  | 2 |
Available-for-Sale Securities, Combined Cost Basis of Impaired Securities |  |  |  |  | $ 98 |
Available-for-Sale Securities, Combined Fair Value of Impaired Securities |  |  |  |  | $ 82 |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Investment Owned, Balance, Shares (in Shares) | shares |  | 10.0 |  | 10.0 |  |
Investment Owned, at Cost |  | $ 2,400 |  | $ 2,400 |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Galileo Partners Fund [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Investment Owned, Balance, Shares (in Shares) | shares |  | 6.5 |  | 6.5 |  |
[1] | Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of December 31, 2017, are $17,353 and $13,847, respectively, and as of June 30, 2017, are $461 and $461, respectively.
[2] | Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.
[3] | Corporate debt matures in 2024.

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