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INVESTMENTS (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2018 | Jun. 30, 2018
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | $ 12,390 |  | $ 12,390 |  |  |
Equity Securities, FV-NI, Cost | $ 13,812 |  | $ 13,812 |  |  |
Market value of investments to Company's total assets | 53.40% |  | 53.40% |  |  |
Other investments | $ 602 |  | $ 602 |  |  |
Equity Method Investments | 219 |  | 219 |  |  | $ 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) |  | $ 82 |  | $ 736 |  |
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  | 24 |  | 31 |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) |  | 60 |  | 746 |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | (3,423) | 60 | (4,374) | 746 |  |
Proceeds from Sale of Available-for-sale Securities |  | 369 | 0 | 401 |  |
Available-for-sale Securities, Gross Realized Gains |  | 30 |  | 37 |  |
Available-for-sale Securities, Gross Realized Losses |  | 6 |  | 6 |  |
Marketable Securities, Noncurrent | 3,592 |  | 3,592 |  |  | 7,086
Equity Securities without Readily Determinable Fair Value, Amount | 602 |  | 602 |  |  | $ 2,207
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 57 |  | 86 |  |  |
Income (Loss) from Equity Method Investments | (48) | 1,218 | (55) | 2,731 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | $ 11,537 |  | $ 11,537 |  |  |
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value | 93.00% |  | 93.00% |  |  | 100.00%
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | $ 853 |  | $ 853 |  |  |
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value | 7.00% |  | 7.00% |  |  |
Equity Securities [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount | $ 223 |  | $ 223 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount | 616 |  | 616 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount | 10 |  | 20 |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount | 0 |  | 0 |  |  |
U.S. Global Investors Funds [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | $ 9,500 |  | $ 9,500 |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Investment Owned, Direct, Percentage | 3.00% |  | 3.00% |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Marketable Securities, Noncurrent | $ 1,900 |  | $ 1,900 |  |  | $ 5,600
One Investment [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Other Investments |  |  |  |  |  | 1,500
One Investment [Member] | Equity Securities [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | 946 |  | 946 |  |  |
One Investment [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | 130 |  | 130 |  |  |
One Investment [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Securities, FV-NI | 816 |  | 816 |  |  |
Galileo Partners Fund [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  | 500
Income (Loss) from Equity Method Investments |  | $ 1,200 |  | $ 2,700 |  |
Galileo Technology and Blockchain Fund [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  | $ 401
Income (Loss) from Equity Method Investments | (43) |  | (50) |  |  |
Galileo Technology and Blockchain Fund [Member] | Minimum [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 20.00% |
Galileo Technology and Blockchain Fund [Member] | Maximum [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 25.00% |
Galileo Technology and Blockchain LP [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Equity Method Investments | 219 |  | 219 |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  | $ 230 |
Income (Loss) from Equity Method Investments | $ (5) |  | $ (5) |  |  |
Equity Method Investment, Ownership Percentage | 16.00% |  | 16.00% |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |
Investment Owned, Balance, Shares (in Shares) | 10 |  | 10 |  |  |
Investment Owned, at Cost | $ 2,400 |  | $ 2,400 |  |  |

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