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INVESTMENTS (Details) - Components of Company's Trading and Available-for-Sale Investments - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Trading securities1    
Trading, cost [1] $ 7,615 $ 10,648
Trading, gross unrealized gain [1] 26 50
Trading, gross unrealized (losses) [1] (208) (978)
Trading, fair value [1] 7,433 9,720
Available-for-sale securities2    
Available-for-sale, cost [1],[2] 5,019 2,940
Available-for-sale, gross unrealized gain [1],[2] 17,358 466
Available-for-sale, gross unrealized (losses) [1],[2] (5) (5)
Available-for-sale, fair value [1],[2] 22,372 3,401
Total securities at fair value, cost 12,634 13,588
Total securities at fair value, gross unrealized gain 17,384 516
Total securities at fair value, gross unrealized (losses) (213) (983)
Total securities at fair value, fair value 29,805 13,121
Fixed Income Securities [Member]    
Trading securities1    
Trading, cost [1] 7,035 8,884
Trading, gross unrealized gain [1] 26 50
Trading, gross unrealized (losses) [1] 0 (7)
Trading, fair value [1] 7,061 8,927
Available-for-sale securities2    
Available-for-sale, cost [1] 1,000 1,148
Available-for-sale, gross unrealized gain [1] 0 1
Available-for-sale, gross unrealized (losses) [1] (5) (5)
Available-for-sale, fair value [1] 995 1,144
Mutual Funds, Domestic Equity [Member]    
Trading securities1    
Trading, cost [1] 535 535
Trading, gross unrealized gain [1] 0 0
Trading, gross unrealized (losses) [1] (163) (157)
Trading, fair value [1] 372 378
Available-for-sale securities2    
Available-for-sale, cost [1] 394 394
Available-for-sale, gross unrealized gain [1] 22 12
Available-for-sale, gross unrealized (losses) [1] 0 0
Available-for-sale, fair value [1] 416 406
Other Securities [Member]    
Trading securities1    
Trading, cost [1] 45 45
Trading, gross unrealized gain [1] 0 0
Trading, gross unrealized (losses) [1] (45) (45)
Trading, fair value [1] 0 0
Available-for-sale securities2    
Available-for-sale, cost [1] 0 56
Available-for-sale, gross unrealized gain [1] 0 10
Available-for-sale, gross unrealized (losses) [1] 0 0
Available-for-sale, fair value [1] 0 66
Offshore Fund [Member]    
Trading securities1    
Trading, cost [1] 0 1,184
Trading, gross unrealized gain [1] 0 0
Trading, gross unrealized (losses) [1] 0 (769)
Trading, fair value [1],[3] 0 415
Common Stock - Domestic [Member]    
Available-for-sale securities2    
Available-for-sale, cost [1] 0 109
Available-for-sale, gross unrealized gain [1] 0 4
Available-for-sale, gross unrealized (losses) [1] 0 0
Available-for-sale, fair value [1] 0 113
Common Stock - International [Member]    
Available-for-sale securities2    
Available-for-sale, cost [1] 2,554 191
Available-for-sale, gross unrealized gain [1] 16,704 12
Available-for-sale, gross unrealized (losses) [1] 0 0
Available-for-sale, fair value [1] 19,258 203
Corporate Debt Securities [Member]    
Available-for-sale securities2    
Available-for-sale, cost [1],[4] 1,071 1,042
Available-for-sale, gross unrealized gain [1],[4] 632 427
Available-for-sale, gross unrealized (losses) [1],[4] 0 0
Available-for-sale, fair value [1],[4] $ 1,703 $ 1,469
[1] Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.
[2] 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.
[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] Corporate debt matures in 2024.