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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Securities, FV-NI $ 11,464 $ 15,187
Equity Method Investments 158 309
Income (Loss) from Equity Method Investments (142) 23
Accounts and Other Receivables, Net, Current 974 309
Investment Income, Interest and Dividend 166 324
U.S. Global Investors Funds [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Securities, FV-NI 7,000 8,800
Investment Income, Dividends and Capital Gains 97 181
Recognized Gains (Losses) on Related Party Securities, Net 0 23
Thunderbird Entertainment Group [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Securities, FV-NI 1,200 1,100
Investment Income, Interest and Dividend 0 31
Mutual Fund [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Accounts and Other Receivables, Net, Current 869 201
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Securities, FV-NI 2,400 3,600
GoldSpot Discoveries, Inc. [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Securities, FV-NI 806 1,700
Galileo Technology and Blockchain LP [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Method Investments $ 158 $ 309