Investments - Components of Company's Trading and Available-for-Sale Investments (Detail) (USD $)	Mar. 31, 2014		Jun. 30, 2013
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Trading, cost	$ 19,062,000	[1]	$ 5,458,000	[1]
Trading, gross unrealized gain	69,000	[1]	75,000	[1]
Trading, gross unrealized (loss)	(485,000)	[1]	(775,000)	[1]
Trading, fair value	18,645,573	[1]	4,758,220	[1]
Available-for-sale, cost	5,112,000	[2],[3]	8,065,000	[2],[3]
Available-for-sale, gross unrealized gain	1,163,000	[2],[3]	1,289,000	[2],[3]
Available-for-sale, gross unrealized (loss)	(34,000)	[2],[3]	(301,000)	[2],[3]
Available-for-sale, fair value	6,240,626	[2],[3]	9,053,111	[2],[3]
Available-for-sale, net unrealized gains, before tax	1,129,000		988,000
Available-for-sale, net unrealized gains, net of tax	745,000		652,000
Offshore fund
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Trading, cost	1,184,000	[1]	1,184,000	[1]
Trading, gross unrealized gain	0	[1]	0	[1]
Trading, gross unrealized (loss)	(310,000)	[1]	(398,000)	[1]
Trading, fair value	874,000	[1]	786,000	[1]
Available-for-sale, cost			5,000,000	[3]
Available-for-sale, gross unrealized gain			0	[3]
Available-for-sale, gross unrealized (loss)			(288,000)	[3]
Available-for-sale, fair value			4,712,000	[3]
Mutual funds - Emerging markets
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Trading, cost			516,000	[1]
Trading, gross unrealized gain			0	[1]
Trading, gross unrealized (loss)			(156,000)	[1]
Trading, fair value			360,000	[1]
Mutual funds - Fixed income
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Trading, cost	17,236,000	[1]	3,116,000	[1]
Trading, gross unrealized gain	69,000	[1]	75,000	[1]
Trading, gross unrealized (loss)	(5,000)	[1]	0	[1]
Trading, fair value	17,300,000	[1]	3,191,000	[1]
Available-for-sale, cost	1,475,000	[3]	1,000,000	[3]
Available-for-sale, gross unrealized gain	9,000	[3]	4,000	[3]
Available-for-sale, gross unrealized (loss)	(3,000)	[3]	0	[3]
Available-for-sale, fair value	1,481,000	[3]	1,004,000	[3]
Mutual funds - Domestic equity
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Trading, cost	535,000	[1]	535,000	[1]
Trading, gross unrealized gain	0	[1]	0	[1]
Trading, gross unrealized (loss)	(80,000)	[1]	(136,000)	[1]
Trading, fair value	455,000	[1]	399,000	[1]
Available-for-sale, cost	660,000	[3]	1,010,000	[3]
Available-for-sale, gross unrealized gain	0	[3]	756,000	[3]
Available-for-sale, gross unrealized (loss)	(2,000)	[3]	0	[3]
Available-for-sale, fair value	658,000	[3]	1,766,000	[3]
Other
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Trading, cost	107,000	[1]	107,000	[1]
Trading, gross unrealized gain	0	[1]	0	[1]
Trading, gross unrealized (loss)	(90,000)	[1]	(85,000)	[1]
Trading, fair value	17,000	[1]	22,000	[1]
Available-for-sale, cost	232,000	[3]	185,000	[3]
Available-for-sale, gross unrealized gain	6,000	[3]	0	[3]
Available-for-sale, gross unrealized (loss)	(3,000)	[3]	(8,000)	[3]
Available-for-sale, fair value	235,000	[3]	177,000	[3]
Common stock - Domestic
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Available-for-sale, cost	378,000	[3]	266,000	[3]
Available-for-sale, gross unrealized gain	414,000	[3]	313,000	[3]
Available-for-sale, gross unrealized (loss)	(4,000)	[3]	0	[3]
Available-for-sale, fair value	788,000	[3]	579,000	[3]
Common stock - International
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Available-for-sale, cost	661,000	[3]	604,000	[3]
Available-for-sale, gross unrealized gain	699,000	[3]	216,000	[3]
Available-for-sale, gross unrealized (loss)	(5,000)	[3]	(5,000)	[3]
Available-for-sale, fair value	1,355,000	[3]	815,000	[3]
Corporate debt
Schedule of Trading Securities and Available-for-sale Securities [Line Items]
Available-for-sale, cost	1,706,000	[3]
Available-for-sale, gross unrealized gain	35,000	[3]
Available-for-sale, gross unrealized (loss)	(17,000)	[3]
Available-for-sale, fair value	$ 1,724,000	[3]

[1] Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.

[2] Net unrealized gains on available-for-sale securities gross and net of tax as of March 31, 2014, are $1,129 and $745, respectively, and as of June 30, 2013, are $988 and $652, respectively.

[3] Unrealized gains and losses on available-for-sale securities are excluded from earnings and recorded in other comprehensive income as a separate component of shareholders’ equity until realized.