INVESTMENTS (Details) - Components of Company's Trading and Available-for-Sale Investments - USD ($) $ in Thousands		Mar. 31, 2018	Jun. 30, 2017
Trading securities1
Trading, cost	[1]	$ 7,365	$ 10,648
Trading, gross unrealized gain	[1]	18	50
Trading, gross unrealized (losses)	[1]	(236)	(978)
Trading, fair value	[1]	7,147	9,720
Available-for-sale securities2
Available-for-sale, cost	[1],[2]	5,034	2,940
Available-for-sale, gross unrealized gain	[1],[2]	8,007	466
Available-for-sale, gross unrealized (losses)	[1],[2]	(90)	(5)
Available-for-sale, fair value	[1],[2]	12,951	3,401
Total securities at fair value, cost		12,399	13,588
Total securities at fair value, gross unrealized gain		8,025	516
Total securities at fair value, gross unrealized (losses)		(326)	(983)
Total securities at fair value, fair value		20,098	13,121
Fixed Income Securities [Member]
Trading securities1
Trading, cost	[1]	6,785	8,884
Trading, gross unrealized gain	[1]	18	50
Trading, gross unrealized (losses)	[1]	(30)	(7)
Trading, fair value	[1]	6,773	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]	(14)	(5)
Available-for-sale, fair value	[1]	986	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]	(161)	(157)
Trading, fair value	[1]	374	378
Available-for-sale securities2
Available-for-sale, cost	[1]	394	394
Available-for-sale, gross unrealized gain	[1]	21	12
Available-for-sale, gross unrealized (losses)	[1]	0	0
Available-for-sale, fair value	[1]	415	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]	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]	7,361	12
Available-for-sale, gross unrealized (losses)	[1]	(76)	0
Available-for-sale, fair value	[1]	9,839	203
Corporate Debt Securities [Member]
Available-for-sale securities2
Available-for-sale, cost	[1],[3]	1,086	1,042
Available-for-sale, gross unrealized gain	[1],[3]	625	427
Available-for-sale, gross unrealized (losses)	[1],[3]	0	0
Available-for-sale, fair value	[1],[3]	$ 1,711	$ 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 March 31, 2018, are $7,917 and $6,430, respectively, and as of June 30, 2017, are $461 and $461, respectively.

[3] Corporate debt has stated maturity in 2024, but issuer has issued notice that it intends to redeem early, as discussed below and in Note 12, Subsequent Events.