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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Securities, FV-NI | $ 15,187 |
Equity Method Investments | 309 | $ 283
Income (Loss) from Equity Method Investments | 23 | 1,624
Accounts and Other Receivables, Net, Current | 501 | 1,216
Other Long-term Investments | 1,404 | 2,207
Investment Income, Interest and Dividend | 348 | 888
U.S. Global Investors Funds [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Securities, FV-NI | 8,800 | 9,600
USGIF and offshore clients [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Investment Income, Dividends and Capital Gains | 181 | 131
Recognized Gains (Losses) on Related Party Securities, Net | 23 | (733)
Thunderbird Entertainment Group [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Securities, FV-NI | 1,100 |
Other Long-term Investments |  | 1,500
Investment Income, Interest and Dividend | 31 | 126
Mutual Fund [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Accounts and Other Receivables, Net, Current | 371 | 419
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Securities, FV-NI | 3,600 | 5,600
GoldSpot Discoveries, Inc. [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Securities, FV-NI | 1,700 |
Galileo Technology and Blockchain LP [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Method Investments | $ 309 |
Galileo Technology and Blockchain Fund [Member] |  |
RELATED PARTY TRANSACTIONS (Details) [Line Items] |  |
Equity Method Investments |  | $ 283

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