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INVESTMENTS (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
INVESTMENTS (Details) [Line Items]      
Equity Securities, FV-NI $ 14,315    
Equity Securities, FV-NI, Cost $ 12,313    
Market value of investments to Company's total assets 53.30%    
Other investments $ 2,200    
Equity Method Investments 281   $ 283
Available-for-sale, net unrealized gain (loss), gross     3,138
Available-for-sale, net unrealized gain (loss), net of tax     2,089
Trading Securities, Realized Gain (Loss)   $ 654  
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments   7  
Trading Securities, Change in Unrealized Holding Gain (Loss)   686  
Equity Securities, FV-NI, Unrealized Gain (Loss) (951) 686  
Proceeds from Sale of Available-for-sale Securities 0 32  
Other-than-temporary impairments   0  
Available-for-sale Securities, Gross Realized Gains   7  
Marketable Securities, Noncurrent 5,525   7,086
Equity Securities without Readily Determinable Fair Value, Amount 2,168   $ 2,207
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net 29    
Income (Loss) from Equity Method Investments (7) 1,513  
Fair Value, Inputs, Level 1 [Member]      
INVESTMENTS (Details) [Line Items]      
Equity Securities, FV-NI $ 14,315    
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value 100.00%   100.00%
Equity Securities [Member]      
INVESTMENTS (Details) [Line Items]      
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount $ 378    
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Cumulative Amount 605    
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount 0    
U.S. Global Investors Funds [Member]      
INVESTMENTS (Details) [Line Items]      
Equity Securities, FV-NI $ 9,600    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]      
INVESTMENTS (Details) [Line Items]      
Investment Owned, Direct, Percentage 3.00%    
Investment Owned, Percentage 3.00%    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 1 [Member]      
INVESTMENTS (Details) [Line Items]      
Marketable Securities, Noncurrent $ 4,600   $ 5,600
Galileo Technology and Blockchain Fund [Member]      
INVESTMENTS (Details) [Line Items]      
Equity Method Investments $ 281    
Equity Method Investment, Aggregate Cost     401
Equity Method Investment, Ownership Percentage 25.00%    
Income (Loss) from Equity Method Investments $ 7    
Galileo Partners Fund [Member]      
INVESTMENTS (Details) [Line Items]      
Equity Method Investment, Aggregate Cost     $ 500
Income (Loss) from Equity Method Investments   $ 1,500  
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]      
INVESTMENTS (Details) [Line Items]      
Investment Owned, Balance, Shares (in Shares) 10    
Investment Owned, at Cost $ 2,400