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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 01, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Securities, FV-NI |  | $ 18,258 | $ 11,464 |
Equity Method Investments |  | 532 | 158 |
Income (Loss) from Equity Method Investments |  | 347 | (142) |
Accounts and Other Receivables, Net, Current |  | 2,534 | 974 |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale |  | 1,408 | 0 |
Realized Gain (Loss) on Principal Payment Proceeds |  | 1,180 | 0 |
Other Income |  | 144 | 117 |
U.S. Global Investors Funds [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Securities, FV-NI |  | 7,300 | 7,000 |
Investment Income, Dividends and Capital Gains |  | 15 | 97 |
Recognized Gains (Losses) on Related Party Securities, Net |  | 0 | 0 |
Thunderbird Entertainment Group [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Securities, FV-NI |  | 2,700 | 1,200 |
Mutual Fund [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Accounts and Other Receivables, Net, Current |  | 2,400 | 869 |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Securities, FV-NI |  | 25,100 | 2,400 |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale |  | 1,400 |  |
Realized Gain (Loss) on Principal Payment Proceeds |  | 1,200 |  |
Equity Securities [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale |  | 0 |  |
Debt Securities [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale |  | 1,408 |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Accounts and Other Receivables, Net, Current |  | 40 | 0 |
Other Income |  | 40 | 0 |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
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, Cost |  |  | 2,400 | $ 2,400
Equity Securities, FV-NI, Realized Gain |  | 15,000 |  |
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Interest Income, Related Party |  | 368 |  |
Thunderbird Entertainment Group [Member] | Equity Securities [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Securities, FV-NI, Realized Gain |  | 936 |  |
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Securities, FV-NI |  |  | 806 |
Equity Securities, FV-NI, Realized Gain |  | $ 600 |  |
Galileo New Economy Fund LP [Member] |  |  |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |  |  |
Equity Method Investments |  |  | $ 158 |

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