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INVESTMENTS (Details)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Jan. 12, 2021
USD ($)
Jul. 01, 2018
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2021
$ / shares
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
INVESTMENTS (Details) [Line Items]                      
Securities, Fair Value     $ 47,188   $ 47,188       $ 11,464    
Securities, Fair Value, Cost     $ 24,200   $ 24,200            
Market value of investments to Company's total assets     70.60%   70.60%            
Other Long-term Investments     $ 2,940   $ 2,940       1,283    
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss     1,000   1,000       0    
Equity Method Investments     596   596       158    
Debt Securities, Available-for-sale, Amortized Cost     8,957   8,957            
Realized Gain (Loss) on Principal Payment Proceeds     552 $ 0 552 $ 0          
Proceeds from Sale of Long-term Investments         22,355 0          
Equity Securities without Readily Determinable Fair Value, Amount     2,940 1,518 2,940 1,518   $ 1,385 1,283 $ 1,488 $ 1,404
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount     6 0 6 0          
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount     542   542            
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount     935   935            
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount     35 108 158 124          
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount     1,900   1,900            
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount     1,156 63 1,156 163          
Income (Loss) from Equity Method Investments     (64) (91) 420 (146)          
U.S. Global Investors Funds [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Current     7,200   7,200       $ 7,000    
Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Current     10,952   10,952            
Equity Securities Still Held [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, Unrealized Gain (Loss)     7,100   13,600            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt and Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Investment Owned, at Cost     $ 15,000   $ 15,000            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Debt Instrument, Interest Rate, Stated Percentage     8.00%   8.00%            
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares     $ 2.34   $ 2.34            
Debt Securities, Available-for-sale, Amortized Cost     $ 14,300   $ 14,300            
Debt Securities, Available-for-sale, Unrealized Gain $ 6,900                    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Investment, Common Share Purchase Warrants (in Shares) | shares     5   5            
Warrant, Description         Each whole warrant, expiring in January 2024, entitles the Company to acquire one common share at a price of $3.00 (Canadian).            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) | $ / shares             $ 3        
Equity Securities, FV-NI, Cost               $ 2,400      
Investment Owned, Balance, Shares (in Shares) | shares                 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%            
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Current     $ 542   $ 542       $ 806    
Equity Securities, FV-NI, Cost     514   514            
Equity Securities, FV-NI, Realized Gain     $ 538   $ 570            
Investment Owned, Direct Percentage     1.80%   1.80%       7.30%    
Galileo New Economy Fund LP [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Method Investments     $ 596   $ 596       $ 158    
Equity Method Investment, Ownership Percentage         22.20%            
Income (Loss) from Equity Method Investments     (64) $ (91) $ 420 $ (146)          
Fair Value, Inputs, Level 1 [Member]                      
INVESTMENTS (Details) [Line Items]                      
Securities, Fair Value     $ 12,309   $ 12,309       $ 11,432    
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value     26.00%   26.00%       100.00%    
Fair Value, Inputs, Level 1 [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Current     $ 4,400   $ 4,400       $ 1,200    
Fair Value, Inputs, Level 1 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Current     542   542       774    
Fair Value, Inputs, Level 2 [Member]                      
INVESTMENTS (Details) [Line Items]                      
Securities, Fair Value     $ 0   $ 0       32    
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value     0.00%   0.00%            
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Remeasured [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities without Readily Determinable Fair Value, Amount     $ 1,700   $ 1,700            
Fair Value, Inputs, Level 2 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Current                 32    
Fair Value, Inputs, Level 3 [Member]                      
INVESTMENTS (Details) [Line Items]                      
Securities, Fair Value     $ 34,879   $ 34,879       $ 0    
Percentage of Financial Assets Derived From Level 3 Inputs Measured at Fair Value     74.00%   74.00%            
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Remeasured [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities without Readily Determinable Fair Value, Amount     $ 470   $ 470            
Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] | Debentures [Member]                      
INVESTMENTS (Details) [Line Items]                      
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 16,000                    
Realized Gain (Loss) on Principal Payment Proceeds         $ 552            
Fair Value, Inputs, Level 3 [Member] | Warrant [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member]                      
INVESTMENTS (Details) [Line Items]                      
Equity Securities, FV-NI, Cost $ 5,900