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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