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INVESTMENTS (Details) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 12 Months Ended | 31 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2021 USD ($) | Jul. 01, 2018 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) shares | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 $ / shares | Dec. 31, 2020 USD ($) | Jun. 30, 2019 USD ($)
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | $ 35,307 | $ 11,464 | $ 35,307 |  |  |
Investments, Current and Noncurrent, Cost |  |  | $ 23,100 |  | $ 23,100 |  |  |
Market value of investments to Company's total assets |  |  | 56.70% |  | 56.70% |  |  |
Other investments |  |  | $ 3,453 | 1,283 | $ 3,453 |  |  |
Debt Securities, Held-to-Maturity, Fair Value, Noncurrent |  |  | 1,000 |  | 1,000 |  |  |
Equity Method Investments |  |  | 532 | 158 | 532 |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  | 1,180 | 0 |  |  |  |
Equity Securities, FV-NI |  |  | 18,258 | 11,464 | 18,258 |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | 3,453 | 1,283 | 3,453 |  |  | $ 1,404
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount |  |  | 6 | 285 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount |  |  | 543 |  | 543 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 935 |  | 935 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount |  |  | 158 | 124 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  | 2,300 |  | 2,300 |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  |  | 1,658 | 163 |  |  |  |
Income (Loss) from Equity Method Investments |  |  | 347 | (142) |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  | 0 | (228) |  |  |  |
Equity Securities, Unrealized Gain (Loss) |  |  | 9,900 |  | 9,900 |  |  |
Galileo [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  |  | (228) |  |  |  |
Debt Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 17,049 | 0 | 17,049 |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 8,026 | 0 | 8,026 |  |  |
U.S. Global Investors Funds [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | 7,300 | 7,000 | 7,300 |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Securities Investment [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Investment Owned, at Cost |  |  | $ 15,000 |  | $ 15,000 |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |  | 8.00% |  |  |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  |  | $ 2.34 |  | $ 2.34 |  |  |
Investment Owned, Balance, Principal Amount |  |  | $ 14,300 |  | $ 14,300 |  |  |
Debt Securities, Available-for-sale, Unrealized Gain | $ 6,900 |  |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in Shares) | shares |  |  | 5 |  | 5 |  |  |
Warrant, Description |  |  | Each whole warrant, expiring in January 2024, entitles the Company to acquire one common share at a price of $3.00 (Canadian). |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares |  |  |  |  |  | $ 3 |  |
Equity Securities, FV-NI, Cost |  |  |  | $ 2,400 |  |  | $ 2,400 |
Investment Owned, Balance, Shares (in Shares) | shares |  |  |  | 10 |  |  |  |
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent |  | $ 3,200 |  |  |  |  |  |
Proceeds from Sale of Long-term Investments |  |  | $ 20,600 |  |  |  |  |
Equity Securities, FV-NI, Realized Gain |  |  | 15,000 |  |  |  |  |
Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Realized Gain |  |  | $ 936 |  |  |  |  |
Investment Owned, Direct Percentage |  |  | 1.60% |  | 1.60% |  |  |
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Realized Gain |  |  | $ 600 |  |  |  |  |
Equity Securities, FV-NI |  |  |  | $ 806 |  |  |  |
Galileo New Economy Fund LP [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Method Investments |  |  | 532 | 158 | $ 532 |  |  |
Income (Loss) from Equity Method Investments |  |  | 347 | (142) |  |  |  |
Maximum [Member] | Galileo New Economy Fund LP [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 22.00% |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | 25,075 | 0 | $ 25,075 |  |  |
Equity Securities, FV-NI |  |  | 8,026 | 0 | 8,026 |  |  |
Fair Value, Inputs, Level 3 [Member] | Remeasured [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | 470 |  | 470 |  |  |
Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Warrants and Convertible Debt [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | 25,100 |  | 25,100 |  |  |
Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] | Debentures [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 16,000 |  |  |  |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  |  | 1,200 |  |  |  |  |
Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] | Warrant [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Cost | $ 5,900 |  |  |  |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | 10,097 | 11,432 | 10,097 |  |  |
Equity Securities, FV-NI |  |  | 10,097 | 11,432 | 10,097 |  |  |
Fair Value, Inputs, Level 1 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Common Stock [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | 2,400 |  | 2,400 |  |  |
Fair Value, Inputs, Level 1 [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  | 2,700 | 1,200 | 2,700 |  |  |
Fair Value, Inputs, Level 1 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  |  | 774 |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Securities, Fair Value |  |  | 135 | 32 | 135 |  |  |
Equity Securities, FV-NI |  |  | 135 | 32 | 135 |  |  |
Fair Value, Inputs, Level 2 [Member] | Remeasured [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  | $ 2,100 |  | $ 2,100 |  |  |
Fair Value, Inputs, Level 2 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  |  |  | $ 32 |  |  |  |

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