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INVESTMENTS (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018
INVESTMENTS (Details) [Line Items] |  |  |
Equity Securities, FV-NI | $ 14,315 |  |
Equity Securities, FV-NI, Cost | $ 12,313 |  |
Market value of investments to Company's total assets | 53.30% |  |
Other investments | $ 2,200 |  |
Equity Method Investments | 281 |  | $ 283
Available-for-sale, net unrealized gain (loss), gross |  |  | 3,138
Available-for-sale, net unrealized gain (loss), net of tax |  |  | 2,089
Trading Securities, Realized Gain (Loss) |  | $ 654 |
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  | 7 |
Trading Securities, Change in Unrealized Holding Gain (Loss) |  | 686 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | (951) | 686 |
Proceeds from Sale of Available-for-sale Securities | 0 | 32 |
Other-than-temporary impairments |  | 0 |
Available-for-sale Securities, Gross Realized Gains |  | 7 |
Marketable Securities, Noncurrent | 5,525 |  | 7,086
Equity Securities without Readily Determinable Fair Value, Amount | 2,168 |  | $ 2,207
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 29 |  |
Income (Loss) from Equity Method Investments | (7) | 1,513 |
Fair Value, Inputs, Level 1 [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Equity Securities, FV-NI | $ 14,315 |  |
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value | 100.00% |  | 100.00%
Equity Securities [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount | $ 378 |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount | 605 |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount | 0 |  |
U.S. Global Investors Funds [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Equity Securities, FV-NI | $ 9,600 |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Investment Owned, Direct, Percentage | 3.00% |  |
Investment Owned, Percentage | 3.00% |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Marketable Securities, Noncurrent | $ 4,600 |  | $ 5,600
Galileo Technology and Blockchain Fund [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Equity Method Investments | $ 281 |  |
Equity Method Investment, Aggregate Cost |  |  | 401
Equity Method Investment, Ownership Percentage | 25.00% |  |
Income (Loss) from Equity Method Investments | $ 7 |  |
Galileo Partners Fund [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Equity Method Investment, Aggregate Cost |  |  | $ 500
Income (Loss) from Equity Method Investments |  | $ 1,500 |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |
INVESTMENTS (Details) [Line Items] |  |  |
Investment Owned, Balance, Shares (in Shares) | 10 |  |
Investment Owned, at Cost | $ 2,400 |  |

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