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INVESTMENTS (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 12,571   $ 11,464  
Equity Securities, FV-NI, Cost $ 12,928   12,928  
Market value of investments to Company's total assets 60.50%      
Other investments $ 1,300   1,283  
Equity Method Investments 182   158  
Equity Securities, FV-NI, Unrealized Gain (Loss) 1,107 $ (3,062)    
Equity Securities without Readily Determinable Fair Value, Amount 1,300 1,396 1,283 $ 1,404
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount 536      
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount 894      
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount 117 8    
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount 780      
Income (Loss) from Equity Method Investments 21 (27)    
U.S. Global Investors Funds [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI 7,000   7,000  
Equity Securities [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI, Unrealized Gain (Loss) 994      
Fair Value, Inputs, Level 1 [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 12,571   $ 11,432  
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value 100.00%   100.00%  
Fair Value, Inputs, Level 2 [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 0   $ 32  
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]        
INVESTMENTS (Details) [Line Items]        
Investment Owned, Balance, Shares (in Shares) 10      
Investment Owned, at Cost $ 2,400      
Investment Owned, Direct Percentage 2.90%      
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 1 [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 2,700   2,400  
Thunderbird Entertainment Group [Member]        
INVESTMENTS (Details) [Line Items]        
Investment Owned, Direct Percentage 2.50%      
Thunderbird Entertainment Group [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 1,800   1,200  
Equity Securities, FV-NI, Cost 1,500      
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 987   806  
Investment Owned, Direct Percentage 7.50%      
GoldSpot Discoveries, Inc. [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI $ 987   774  
Investment Owned, at Cost 1,600      
GoldSpot Discoveries, Inc. [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Securities, FV-NI     32  
Galileo Technology and Blockchain Fund LP [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Method Investments 182   $ 158  
Income (Loss) from Equity Method Investments $ 21 $ (27)    
Galileo Technology and Blockchain Fund LP [Member] | Maximum [Member]        
INVESTMENTS (Details) [Line Items]        
Equity Method Investment, Ownership Percentage 22.00%