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INVESTMENTS (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   $ 12,494   $ 12,494     $ 11,464    
Equity Securities, FV-NI, Cost   $ 10,600   $ 10,600     12,928    
Market value of investments to Company's total assets   29.60%   29.60%          
Other investments   $ 1,385   $ 1,385     1,283    
Debt Securities, Held-to-maturity   1,000   1,000     0    
Equity Method Investments   654   654     158    
Proceeds from Sale of Long-term Investments       20,720 $ 0        
Equity Securities without Readily Determinable Fair Value, Amount   1,385 $ 1,488 1,385 1,488 $ 1,300 1,283 $ 1,396 $ 1,404
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount   536   536          
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount   900   900          
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount   6 8 123 16        
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount   780   780          
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount   0 100 0 100        
Income (Loss) from Equity Method Investments   463 (28) 484 (55)        
U.S. Global Investors Funds [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   7,100   7,100     7,000    
Equity Securities [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, Unrealized Gain (Loss)   5,500   6,500          
Fair Value, Inputs, Level 1 [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   $ 12,494   $ 12,494     $ 11,432    
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value   100.00%   100.00%     100.00%    
Fair Value, Inputs, Level 2 [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   $ 0   $ 0     $ 32    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI, Cost   $ 2,400   $ 2,400          
Investment Owned, Balance, Shares (in Shares)   10   10          
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, Realized Gain   15,000              
Thunderbird Entertainment Group [Member] | Equity Securities [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI, Cost   $ 1,500   $ 1,500          
Investment Owned, Direct Percentage   2.40%   2.40%          
Thunderbird Entertainment Group [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   $ 3,000   $ 3,000     1,200    
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   2,100   2,100     806    
Equity Securities, FV-NI, Cost   $ 1,500   $ 1,500          
Investment Owned, Direct Percentage   7.30%   7.30%          
GoldSpot Discoveries, Inc. [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI   $ 2,100   $ 2,100     774    
GoldSpot Discoveries, Inc. [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Securities, FV-NI             32    
Galileo New Economy Fund LP [Member]                  
INVESTMENTS (Details) [Line Items]                  
Equity Method Investments   654   $ 654     $ 158    
Equity Method Investment, Ownership Percentage       21.60%          
Income (Loss) from Equity Method Investments   $ 463 $ (28) $ 484 $ (55)