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Investments - Fair Value Measurements on Recurring Basis (Detail) (USD $)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	$ 4,758,220	$ 5,216,139	$ 5,703,916
Total available-for-sale securities	9,053,111	8,824,311	4,660,928
Total Investments	13,811,331	14,040,000
Common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	22,000	211,000
Total available-for-sale securities	1,394,000	1,228,000
Mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	3,950,000	3,980,000
Total available-for-sale securities	2,784,000	2,617,000
Offshore fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	786,000	1,025,000
Total available-for-sale securities	4,712,000	4,811,000
Venture capital investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	163,000	168,000
Quoted Prices (Level 1) [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	3,972,000	4,165,000
Total available-for-sale securities	4,083,000	3,845,000
Total Investments	8,055,000	8,010,000
Quoted Prices (Level 1) [Member] \| Common stock [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	22,000	185,000
Total available-for-sale securities	1,299,000	1,228,000
Quoted Prices (Level 1) [Member] \| Mutual funds [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	3,950,000	3,980,000
Total available-for-sale securities	2,784,000	2,617,000
Quoted Prices (Level 1) [Member] \| Offshore fund [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities
Total available-for-sale securities
Quoted Prices (Level 1) [Member] \| Venture capital investments [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities
Significant Other Inputs (Level 2) [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	785,990	1,051,000
Total available-for-sale securities	4,712,000	4,811,000
Total Investments	5,498,000	5,862,000
Significant Other Inputs (Level 2) [Member] \| Common stock [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities		26,000
Total available-for-sale securities
Significant Other Inputs (Level 2) [Member] \| Mutual funds [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities
Total available-for-sale securities
Significant Other Inputs (Level 2) [Member] \| Offshore fund [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	785,990	1,025,000
Total available-for-sale securities	4,712,000	4,811,000
Significant Other Inputs (Level 2) [Member] \| Venture capital investments [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities
Total available-for-sale securities	258,000	168,000
Total Investments	258,000	168,000
Significant Unobservable Inputs (Level 3) [Member] \| Common stock [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities
Total available-for-sale securities	95,000
Significant Unobservable Inputs (Level 3) [Member] \| Mutual funds [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities
Total available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Offshore fund [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities
Total available-for-sale securities
Significant Unobservable Inputs (Level 3) [Member] \| Venture capital investments [Member] \| Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 163,000	$ 168,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

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