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INVESTMENTS (Details)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
INVESTMENTS (Details) [Line Items]          
Fair value of investments held $ 29,805   $ 29,805   $ 13,121
Cost basis of investments held $ 12,634   $ 12,634   13,588
Market value of investments to Company's total assets 66.10%   66.10%    
Other investments $ 2,109   $ 2,109   2,130
Equity Method Investments 3,252   3,252   0
Available-for-sale, net unrealized gain (loss), gross 17,353   17,353   461
Available-for-sale, net unrealized gain (loss), net of tax 13,847   13,847   461
Other-than-temporary impairments 0 $ 0 0 $ 16  
Available-for-sale securities, fair value [1],[2] 22,372   22,372   3,401
Trading Securities [2] 7,433   7,433   9,720
Income (Loss) from Equity Method Investments 1,218 $ 0 2,731 $ 0  
Fair Value, Inputs, Level 1 [Member]          
INVESTMENTS (Details) [Line Items]          
Fair value of investments held $ 9,002   $ 9,002   $ 12,706
Percentage of Financial Assets Derived From Level 1 Inputs Measured at Fair Value 30.00%   30.00%   100.00%
Available-for-sale securities, fair value $ 1,569   $ 1,569   $ 3,401
Trading Securities 7,433   7,433   9,305
Fair Value, Inputs, Level 2 [Member]          
INVESTMENTS (Details) [Line Items]          
Fair value of investments held $ 20,803   $ 20,803   0
Percentage of Financial Assets Derived From Level 2 Inputs Measured at Fair Value 70.00%   70.00%    
Available-for-sale securities, fair value $ 20,803   $ 20,803   0
Trading Securities 0   0   0
U.S. Global Investors Funds [Member]          
INVESTMENTS (Details) [Line Items]          
Investments, Fair Value Disclosure $ 8,800   $ 8,800    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]          
INVESTMENTS (Details) [Line Items]          
Investment Owned, Direct, Percentage 3.30%   3.30%    
Investment Owned, Percentage 4.00%   4.00%    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Fair Value, Inputs, Level 2 [Member]          
INVESTMENTS (Details) [Line Items]          
Available-for-sale securities, fair value $ 19,100   $ 19,100    
Offshore Fund [Member] | Net Asset Value Per Share [Member]          
INVESTMENTS (Details) [Line Items]          
Trading Securities         415
Galileo Partners Fund [Member]          
INVESTMENTS (Details) [Line Items]          
Equity Method Investments 3,300   3,300    
Equity Method Investment, Aggregate Cost $ 500   $ 500    
Equity Method Investment, Ownership Percentage 30.00%   30.00%    
Income (Loss) from Equity Method Investments $ 1,200   $ 2,700    
Corporate Debt Securities [Member]          
INVESTMENTS (Details) [Line Items]          
Available-for-sale securities, fair value [2],[3] 1,703   1,703   1,469
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]          
INVESTMENTS (Details) [Line Items]          
Available-for-sale securities, fair value 0   0   1,469
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]          
INVESTMENTS (Details) [Line Items]          
Available-for-sale securities, fair value $ 1,703   $ 1,703   $ 0
Impaired Securities [Member]          
INVESTMENTS (Details) [Line Items]          
Number of positions, subject to impairment loss       2  
Available-for-Sale Securities, Combined Cost Basis of Impaired Securities       $ 98  
Available-for-Sale Securities, Combined Fair Value of Impaired Securities       $ 82  
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]          
INVESTMENTS (Details) [Line Items]          
Investment Owned, Balance, Shares (in Shares) | shares 10.0   10.0    
Investment Owned, at Cost $ 2,400   $ 2,400    
HIVE Blockchain Technologies Ltd. ("HIVE") [Member] | Galileo Partners Fund [Member]          
INVESTMENTS (Details) [Line Items]          
Investment Owned, Balance, Shares (in Shares) | shares 6.5   6.5    
[1] Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of December 31, 2017, are $17,353 and $13,847, respectively, and as of June 30, 2017, are $461 and $461, respectively.
[2] Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.
[3] Corporate debt matures in 2024.