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INVESTMENTS (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Feb. 28, 2018 | Jun. 30, 2017 USD ($)
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Fair value of investments held |  |  | $ 20,098 |  | $ 20,098 |  |  | $ 13,121
Cost basis of investments held |  |  | $ 12,399 |  | $ 12,399 |  |  | 13,588
Market value of investments to Company's total assets |  |  | 59.20% |  | 59.20% |  |  |
Other investments |  |  | $ 2,217 |  | $ 2,217 |  |  | 2,130
Equity Method Investments |  |  | 1,160 |  | 1,160 |  |  | 0
Available-for-sale, net unrealized gain (loss), gross |  |  | 7,917 |  | 7,917 |  |  | 461
Available-for-sale, net unrealized gain (loss), net of tax |  |  | 6,430 |  | 6,430 |  |  | 461
Available-for-sale securities, fair value | [1],[2] |  | 12,951 |  | 12,951 |  |  | 3,401
Proceeds from Sale of Available-for-sale Securities |  |  | 0 | $ 0 | 401 | $ 649 |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  |  | 37 | 34 |  |
Available-for-sale Securities, Gross Realized Losses |  |  |  |  | 6 | 3 |  |
Other-than-temporary impairments |  |  | $ 0 | 0 | $ 0 | 16 |  |
Number of Unit Trust Investment Funds |  |  | 2 |  | 2 |  |  |
Trading Securities | [2] |  | $ 7,147 |  | $ 7,147 |  |  | 9,720
Income (Loss) from Equity Method Investments |  |  | (927) | $ 0 | 1,804 | 0 |  |
Proceeds from Sale of Equity Method Investments |  |  |  |  | 1,462 | $ 0 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Fair value of investments held |  |  | 20,098 |  | 20,098 |  |  | 12,706
Available-for-sale securities, fair value |  |  | $ 12,951 |  | $ 12,951 |  |  | $ 3,401
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value |  |  | 100.00% |  | 100.00% |  |  | 100.00%
Trading Securities |  |  | $ 7,147 |  | $ 7,147 |  |  | $ 9,305
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Fair value of investments held |  |  | 0 |  | 0 |  |  | 0
Available-for-sale securities, fair value |  |  | 0 |  | 0 |  |  | 0
Trading Securities |  |  | 0 |  | 0 |  |  | 0
U.S. Global Investors Funds [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure |  |  | $ 8,500 |  | $ 8,500 |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Investment Owned, Direct, Percentage |  |  | 3.30% |  | 3.30% |  |  |
Investment Owned, Percentage |  |  | 3.70% |  | 3.70% |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, fair value |  |  | $ 9,800 |  | $ 9,800 |  |  |
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 |  |  | 936 |  | 936 |  |  |
Equity Method Investment, Aggregate Cost |  |  | $ 500 |  | $ 500 |  |  |
Equity Method Investment, Ownership Percentage |  | 30.00% | 26.00% |  | 26.00% |  |  |
Income (Loss) from Equity Method Investments |  |  | $ (840) |  | $ 1,900 |  |  |
Proceeds from Sale of Equity Method Investments |  | $ 1,500 |  |  |  |  |  |
Galileo Partners Fund [Member] | Minimum [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  | 23.00% |
Galileo Partners Fund [Member] | Maximum [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 26.00% |  | 26.00% |  |  |
Galileo Technology and Blockchain Fund [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Method Investments |  |  | $ 224 |  | $ 224 |  |  |
Equity Method Investment, Aggregate Cost |  |  | $ 325 |  | $ 325 |  |  |
Equity Method Investment, Ownership Percentage |  |  | 20.00% |  | 20.00% |  |  |
Income (Loss) from Equity Method Investments |  |  | $ (87) |  | $ (87) |  |  |
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 |  |  | 10,000,000 |  | 10,000,000 |  |  |
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 |  |  | 5,000,000 |  | 5,000,000 |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Galileo Technology and Blockchain Fund [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in Shares) | shares |  |  | 95,000 |  | 95,000 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, fair value | [2],[3] |  | $ 1,711 |  | $ 1,711 |  |  | 1,469
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, fair value |  |  | 1,711 |  | 1,711 |  |  | 1,469
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, fair value |  |  | $ 0 |  | $ 0 |  |  | $ 0
[1] | Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of March 31, 2018, are $7,917 and $6,430, 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 has stated maturity in 2024, but issuer has issued notice that it intends to redeem early, as discussed below and in Note 12, Subsequent Events.

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