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INVESTMENTS (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 34 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 12, 2021 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2021 $ / shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($)
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Securities, Fair Value |  | $ 30,776 |  | $ 30,776 |  | $ 35,307 |
Investments, Current and Noncurrent, Cost |  | $ 22,200 |  | $ 22,200 |  |  |
Market value of investments to Company's total assets |  | 49.70% |  | 49.70% |  |  |
Other investments |  | $ 3,453 |  | $ 3,453 |  | 3,453 |
Debt Securities, Held-to-Maturity, Fair Value, Noncurrent |  | 1,000 |  | 1,000 |  |  |
Equity Method Investments |  | 536 |  | 536 |  | 532 |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value |  | 15,852 |  | 15,852 |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  | 602 | $ 0 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  | 3,453 | 1,300 | 3,453 |  | 3,453 | $ 1,283
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount |  | 542 |  | 542 |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount |  |  | 935 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount |  | 0 | 117 |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount |  |  |  |  |  | 2,300 |
Income (Loss) from Equity Method Investments |  | 15 | 21 |  |  |  |
Equity Securities, Unrealized Gain (Loss) |  | 2,400 | 544 | 2,400 |  |  |
Debt Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 15,852 |  | 15,852 |  | 17,049 |
Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 7,339 |  | 7,339 |  | 8,026 |
U.S. Global Investors Funds [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  | $ 7,200 |  | $ 7,200 |  | $ 7,300 |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Securities Investment [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Investment Owned, at Cost | $ 15,000 |  |  |  |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 8.00% |
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares |  | $ 2.34 |  | $ 2.34 |  |  |
Investment Owned, Balance, Principal Amount |  | $ 12,800 |  | $ 12,800 |  | $ 14,300 |
Debt Securities, Available-for-sale, Unrealized Gain | 6,900 |  |  |  |  |  |
Realized Gain (Loss) on Principal Payment Proceeds |  | 602 |  |  |  |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) |  | $ 5,100 |  |  |  |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Investment, Common Share Purchase Warrants (in Shares) | shares |  |  |  |  |  | 5,000,000 |
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 |  |
Galileo New Economy Fund LP [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Method Investments |  | $ 536 |  | $ 536 |  | $ 532 |
Income (Loss) from Equity Method Investments |  | $ 15 | $ 21 |  |  |  |
Maximum [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Investment Owned, Direct Percentage |  | 1.00% |  | 1.00% |  |  |
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 |  | $ 23,191 |  | $ 23,191 |  | 25,075 |
Fair Value, Inputs, Level 3 [Member] | Remeasured [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities without Readily Determinable Fair Value, Amount |  |  |  |  |  | 470 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Securities, Fair Value |  | 7,585 |  | 7,585 |  | 10,097 |
Fair Value, Inputs, Level 1 [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI, Current |  | $ 65 |  | 65 |  | 2,700 |
Investment, Shares Sold (in Shares) | shares |  | 779,000 |  |  |  |  |
Equity Securities, FV-NI, Realized Gain |  | $ 1,800 |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Securities, Fair Value |  | 0 |  | 0 |  | 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 |
Warrants and Convertible Debt [Member] | Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Securities, Fair Value |  | $ 23,200 |  | $ 23,200 |  | $ 25,100 |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Equity Securities, FV-NI, Cost | 5,900 |  |  |  |  |  |
Debentures [Member] | Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] |  |  |  |  |  |  |
INVESTMENTS (Details) [Line Items] |  |  |  |  |  |  |
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | $ 16,000 |  |  |  |  |  |

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