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INVESTMENTS (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 34 Months Ended
Jan. 12, 2021
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2021
$ / shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
INVESTMENTS (Details) [Line Items]              
Securities, Fair Value   $ 30,776   $ 30,776   $ 35,307  
Investments, Current and Noncurrent, Cost   $ 22,200   $ 22,200      
Market value of investments to Company's total assets   49.70%   49.70%      
Other investments   $ 3,453   $ 3,453   3,453  
Debt Securities, Held-to-Maturity, Fair Value, Noncurrent   1,000   1,000      
Equity Method Investments   536   536   532  
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value   15,852   15,852      
Realized Gain (Loss) on Principal Payment Proceeds   602 $ 0        
Equity Securities without Readily Determinable Fair Value, Amount   3,453 1,300 3,453   3,453 $ 1,283
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        
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount   0 117        
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount           2,300  
Income (Loss) from Equity Method Investments   15 21        
Equity Securities, Unrealized Gain (Loss)   2,400 544 2,400      
Debt Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   15,852   15,852   17,049  
Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   7,339   7,339   8,026  
U.S. Global Investors Funds [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Securities, FV-NI, Current   $ 7,200   $ 7,200   $ 7,300  
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Securities Investment [Member]              
INVESTMENTS (Details) [Line Items]              
Investment Owned, at Cost $ 15,000            
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage           8.00%  
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares   $ 2.34   $ 2.34      
Investment Owned, Balance, Principal Amount   $ 12,800   $ 12,800   $ 14,300  
Debt Securities, Available-for-sale, Unrealized Gain 6,900            
Realized Gain (Loss) on Principal Payment Proceeds   602          
Debt Securities, Available-for-sale, Unrealized Gain (Loss)   $ 5,100          
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Investment, Common Share Purchase Warrants (in Shares) | shares           5,000,000  
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    
Galileo New Economy Fund LP [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Method Investments   $ 536   $ 536   $ 532  
Income (Loss) from Equity Method Investments   $ 15 $ 21        
Maximum [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Investment Owned, Direct Percentage   1.00%   1.00%      
Maximum [Member] | Galileo New Economy Fund LP [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Method Investment, Ownership Percentage       22.00%      
Fair Value, Inputs, Level 3 [Member]              
INVESTMENTS (Details) [Line Items]              
Securities, Fair Value   $ 23,191   $ 23,191   25,075  
Fair Value, Inputs, Level 3 [Member] | Remeasured [Member] | Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Securities without Readily Determinable Fair Value, Amount           470  
Fair Value, Inputs, Level 1 [Member]              
INVESTMENTS (Details) [Line Items]              
Securities, Fair Value   7,585   7,585   10,097  
Fair Value, Inputs, Level 1 [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Securities, FV-NI, Current   $ 65   65   2,700  
Investment, Shares Sold (in Shares) | shares   779,000          
Equity Securities, FV-NI, Realized Gain   $ 1,800          
Fair Value, Inputs, Level 2 [Member]              
INVESTMENTS (Details) [Line Items]              
Securities, Fair Value   0   0   135  
Fair Value, Inputs, Level 2 [Member] | Remeasured [Member] | Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Securities without Readily Determinable Fair Value, Amount           2,100  
Warrants and Convertible Debt [Member] | Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member]              
INVESTMENTS (Details) [Line Items]              
Securities, Fair Value   $ 23,200   $ 23,200   $ 25,100  
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Equity Securities, FV-NI, Cost 5,900            
Debentures [Member] | Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member]              
INVESTMENTS (Details) [Line Items]              
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value $ 16,000