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INVESTMENTS (Details)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 6 Months Ended 37 Months Ended
Jan. 12, 2021
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2021
$ / shares
Jun. 30, 2021
USD ($)
shares
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value   $ 30,452   $ 30,452   $ 30,452   $ 35,307
Investments, Current and Noncurrent, Cost   $ 22,200   $ 22,200   $ 22,200    
Market value of investments to Company's total assets   47.40%   47.40%   47.40%    
Other investments   $ 3,551   $ 3,551   $ 3,551   3,453
Debt Securities, Held-to-Maturity, Fair Value, Noncurrent   1,000   1,000   1,000    
Equity Method Investments   489   489   489   532
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value   14,971   14,971   14,971    
Realized Gain (Loss) on Principal Payment Proceeds   569 $ 0 1,170 $ 0      
Equity Securities without Readily Determinable Fair Value, Amount   3,551 1,385 3,551 1,385 3,551   3,500
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount   2,300   2,300   2,300    
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount   1,500   1,500   1,500    
Income (Loss) from Equity Method Investments   (48) 463 (33) 484      
Equity Securities Without Readily Determinable Fair Values Unrealized Gain (Loss)   0 0 0 (113)      
Fair Value, Inputs, Level 3 [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value   22,287   22,287   22,287   25,075
Fair Value, Inputs, Level 1 [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value   8,165   8,165   8,165   10,097
Debt Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   14,971   14,971   14,971   17,049
Equity Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   7,316   7,316   7,316   8,026
U.S. Global Investors Funds [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Current   7,200   7,200   7,200   7,300
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 3 [Member] | Warrants and Convertible Debt [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value   $ 22,300   $ 22,300   $ 22,300   $ 25,100
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   $ 2.34    
Investment Owned, Balance, Principal Amount   $ 12,100   $ 12,100   $ 12,100   $ 14,300
Debt Securities, Available-for-sale, Unrealized Gain 6,900              
Realized Gain (Loss) on Principal Payment Proceeds   569   1,200        
Debt Securities, Available-for-sale, Unrealized Gain (Loss)       $ 4,500        
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Debentures [Member]                
INVESTMENTS (Details) [Line Items]                
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value 16,000              
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  
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Warrant [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Cost $ 5,900              
Thunderbird Entertainment Group [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Current               $ 2,700
Equity Securities, FV-NI, Realized Gain   43   $ 1,900        
Galileo New Economy Fund LP [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Method Investments   489   489   $ 489   $ 532
Income (Loss) from Equity Method Investments   $ (48) $ 463 $ (33) $ 484      
Galileo New Economy Fund LP [Member] | Maximum [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Method Investment, Ownership Percentage           22.00%