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INVESTMENTS (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Nov. 30, 2018 | Jun. 30, 2018
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | $ 15,466 |  | $ 15,466 |  |  |
Equity Securities, FV-NI, Cost |  | $ 14,900 |  | $ 14,900 |  |  |
Market value of investments to Company's total assets |  | 64.70% |  | 64.70% |  |  |
Other investments |  | $ 645 |  | $ 645 |  |  |
Equity Method Investments |  | 228 |  | 228 |  |  | $ 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) |  |  |  |  | $ 736 |  |
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  |  |  |  | 31 |  |
Trading Securities, Change in Unrealized Holding Gain (Loss) |  |  | $ (36) |  | 710 |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | [1] | 1,987 | (36) | (2,387) | 710 |  |
Proceeds from Sale of Available-for-sale Securities |  |  | 0 | 0 | 401 |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  |  | 37 |  |
Available-for-sale Securities, Gross Realized Losses |  |  |  |  | 6 |  |
Marketable Securities, Noncurrent |  | 7,178 |  | 7,178 |  |  | 7,086
Equity Securities without Readily Determinable Fair Value, Amount |  | 645 |  | 645 |  |  | $ 2,207
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  | 28 |  | 114 |  |  |
Income (Loss) from Equity Method Investments |  | 3 | (927) | (52) | 1,804 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | $ 13,627 |  | $ 13,627 |  |  |
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value |  | 88.00% |  | 88.00% |  |  | 100.00%
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | $ 1,839 |  | $ 1,839 |  |  |
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value |  | 12.00% |  | 12.00% |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount |  | $ 251 |  | $ 251 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  | 644 |  | 644 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount |  | 29 |  | 49 |  |  |
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 |  | $ 9,000 |  | $ 9,000 |  |  |
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 |  | $ 4,000 |  | $ 4,000 |  |  | $ 5,600
Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | 1,100 |  | 1,100 |  |  |
Other Investments |  |  |  |  |  |  | 1,500
Thunderbird Entertainment Group [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | 143 |  | 143 |  |  |
Thunderbird Entertainment Group [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | 979 |  | 979 |  |  |
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | 1,300 |  | 1,300 |  |  |
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | 395 |  | 395 |  |  |
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI |  | 860 |  | 860 |  |  |
Galileo Partners Fund [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  |  | 500
Income (Loss) from Equity Method Investments |  |  | (840) |  | (1,900) |  |
Galileo Technology and Blockchain Fund [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  |  | $ 401
Income (Loss) from Equity Method Investments |  |  | $ (87) | (50) | $ (87) |  |
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 |  | 228 |  | 228 |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  | $ 230 |
Income (Loss) from Equity Method Investments |  | $ 3 |  | $ (2) |  |  |
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 |  |  |
[1] | The prior year amounts shown include ($36) and $710 in unrealized gains (losses) on trading securities for the three and nine months ended March 31, 2018, respectively (classification used prior to the adoption of ASU 2016-01 effective July 1, 2018).

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