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RELATED PARTY TRANSACTIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Trading and Available-for-Sale Securities, Fair Value Disclosure $ 15,265 $ 13,121
Equity Method Investments 283 0
Income (Loss) from Equity Method Investments 1,624 0
Accounts and Other Receivables, Net, Current 1,216 520
Available-for-sale Securities [1],[2] 7,086 3,401
Debt Securities, Trading, and Equity Securities, FV-NI [3],[4] 8,179 9,720
Other Long-term Investments 2,207 2,130
Investment Income, Interest and Dividend 888 820
USGIF and offshore clients [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Trading and Available-for-Sale Securities, Fair Value Disclosure 9,600 11,100
Investment Income, Dividends and Capital Gains 131 110
Recognized Gains (Losses) on Related Party Securities, Net 10 15
Private Company [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Other Long-term Investments 1,500 1,500
Investment Income, Interest and Dividend 126 105
Mutual Fund [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Accounts and Other Receivables, Net, Current 419 396
Offshore Fund [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI [4] 0 $ 415
HIVE Blockchain Technologies Ltd. ("HIVE") [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Available-for-sale Securities 5,600  
Galileo Technology and Blockchain Fund [Member]    
RELATED PARTY TRANSACTIONS (Details) [Line Items]    
Equity Method Investments $ 283  
[1] Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of June 30, 2018, are $3,138 and $2,089, respectively, and as of June 30, 2017, are $461 and $461, respectively.
[2] Unrealized gains and losses on available-for-sale securities are excluded from earnings and recorded in other comprehensive income (loss) as a separate component of shareholders' equity until realized.
[3] In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheets.
[4] Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.