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INVESTMENTS (Details)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended 31 Months Ended
Jan. 12, 2021
USD ($)
Jul. 01, 2018
USD ($)
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
$ / shares
Dec. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value     $ 35,307 $ 11,464 $ 35,307      
Investments, Current and Noncurrent, Cost     $ 23,100   $ 23,100      
Market value of investments to Company's total assets     56.70%   56.70%      
Other investments     $ 3,453 1,283 $ 3,453      
Debt Securities, Held-to-Maturity, Fair Value, Noncurrent     1,000   1,000      
Equity Method Investments     532 158 532      
Realized Gain (Loss) on Principal Payment Proceeds     1,180 0        
Equity Securities, FV-NI     18,258 11,464 18,258      
Equity Securities without Readily Determinable Fair Value, Amount     3,453 1,283 3,453     $ 1,404
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount     6 285        
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount     543   543      
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     158 124        
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount     2,300   2,300      
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount     1,658 163        
Income (Loss) from Equity Method Investments     347 (142)        
Foreign Currency Transaction Gain (Loss), before Tax     0 (228)        
Equity Securities, Unrealized Gain (Loss)     9,900   9,900      
Galileo [Member]                
INVESTMENTS (Details) [Line Items]                
Foreign Currency Transaction Gain (Loss), before Tax       (228)        
Debt Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     17,049 0 17,049      
Equity Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value     8,026 0 8,026      
U.S. Global Investors Funds [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Current     7,300 7,000 7,300      
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Securities Investment [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      
Investment Owned, Balance, Principal Amount     $ 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     $ 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, Realized Gain     $ 936          
Investment Owned, Direct Percentage     1.60%   1.60%      
GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Realized Gain     $ 600          
Equity Securities, FV-NI       $ 806        
Galileo New Economy Fund LP [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Method Investments     532 158 $ 532      
Income (Loss) from Equity Method Investments     347 (142)        
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     25,075 0 $ 25,075      
Equity Securities, FV-NI     8,026 0 8,026      
Fair Value, Inputs, Level 3 [Member] | Remeasured [Member] | Equity Securities [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] | Warrants and Convertible Debt [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value     25,100   25,100      
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     1,200          
Fair Value, Inputs, Level 3 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Equity Securities [Member] | Warrant [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Cost $ 5,900              
Fair Value, Inputs, Level 1 [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value     10,097 11,432 10,097      
Equity Securities, FV-NI     10,097 11,432 10,097      
Fair Value, Inputs, Level 1 [Member] | HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Common Stock [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value     2,400   2,400      
Fair Value, Inputs, Level 1 [Member] | Thunderbird Entertainment Group [Member] | Equity Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Current     2,700 1,200 2,700      
Fair Value, Inputs, Level 1 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Current       774        
Fair Value, Inputs, Level 2 [Member]                
INVESTMENTS (Details) [Line Items]                
Securities, Fair Value     135 32 135      
Equity Securities, FV-NI     135 32 135      
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   $ 2,100      
Fair Value, Inputs, Level 2 [Member] | GoldSpot Discoveries, Inc. [Member] | Equity Securities [Member]                
INVESTMENTS (Details) [Line Items]                
Equity Securities, FV-NI, Current       $ 32