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INVESTMENTS (Details)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2018
USD ($)
Mar. 31, 2021
USD ($)
$ / 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   $ 42,427   $ 42,427       $ 11,464    
Securities, Fair Value, Cost   $ 24,800   $ 24,800            
Market value of investments to Company's total assets   69.50%   69.50%            
Equity Method Investments   $ 596   $ 596       158    
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   7,200   7,200       7,000    
Equity Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Equity Securities, Unrealized Gain (Loss)   14,700   21,100            
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   29.00%   29.00%       100.00%    
Fair Value, Inputs, Level 2 [Member]                    
INVESTMENTS (Details) [Line Items]                    
Securities, Fair Value   $ 30,118   $ 30,118       $ 32    
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value   71.00%   71.00%            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Investment Owned, at Cost   $ 15,000   $ 15,000            
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            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Investment, Common Share Purchase Warrants (in Shares) | shares       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           $ 3.00        
Investment Owned, Balance, Shares (in Shares) | shares               10    
Equity Securities, FV-NI, Cost             $ 2,400      
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            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debentures [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value   16,500   16,500            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Common Share Purchase Warrants [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Equity Securities, FV-NI   12,600   12,600            
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   $ 4,400   $ 4,400       $ 1,200    
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Equity Securities, FV-NI   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%    
GoldSpot Discoveries, Inc. [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]                    
INVESTMENTS (Details) [Line Items]                    
Equity Securities, FV-NI   $ 542   $ 542       $ 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   596   $ 596       $ 158    
Equity Method Investment, Ownership Percentage       22.20%            
Income (Loss) from Equity Method Investments   $ (64) $ (91) $ 420 $ (146)