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Investments - Additional Information (Detail) (USD $) | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended
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Mar. 31, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2013 Venture capital investments [Member] | Jun. 30, 2012 Venture capital investments [Member] | Jun. 30, 2013 Venture capital investments [Member] Medical and medical technology sectors [Member] | Jun. 30, 2013 Venture capital investments [Member] Significant Unobservable Inputs (Level 3) [Member] Medical and medical technology sectors [Member] | Jun. 30, 2013 Offshore fund [Member] | Jun. 30, 2012 Offshore fund [Member] | Jun. 30, 2013 Offshore fund [Member] Significant Other Inputs (Level 2) [Member] Energy and Natural Resource Sectors [Member] | Jun. 30, 2012 Offshore fund [Member] Significant Other Inputs (Level 2) [Member] Dividend Paying Equity and Debt Securities [Member] | Mar. 31, 2012 Available-for-sale Securities [Member] Venture capital investments [Member] Significant Unobservable Inputs (Level 3) [Member] | Jun. 30, 2012 Available-for-sale Securities [Member] Offshore fund [Member] Significant Other Inputs (Level 2) [Member] | Jun. 30, 2012 Trading Securities [Member] Offshore fund [Member] Significant Other Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investments held |  | $ 13,811,331 | $ 14,040,000 |  |  |  |  |  |  |  |  |  |  |  |
Cost basis of investments held |  | 13,522,891 |  |  |  |  |  |  |  |  |  |  |  |  |
Market value of investments to Company's total assets |  | 35.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of financial assets derived from Level 1 inputs measured at fair value |  | 58.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of financial assets derived from Level 2 inputs measured at fair value |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of financial assets derived from Level 3 inputs measured at fair value |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities, at fair value |  | 4,758,220 | 5,216,139 | 5,703,916 |  |  |  |  | 786,000 | 1,025,000 | 785,990 |  |  |  |
Redemption description of investment |  |  |  |  |  |  |  |  |  |  |  |  |  | First business day of each month after providing a redemption notice at least forty-five days prior to the proposed redemption date | first business day of each month after providing a redemption notice at least forty-five days prior to the proposed redemption date.
Available-for-sale securities, at fair value |  | 9,053,111 | 8,824,311 | 4,660,928 | 163,000 | 168,000 |  | 162,841 | 4,712,000 | 4,811,000 |  | 4,712,205 |  |  |
Level 3 investment in venture capital investment, realized gain on redemption |  |  |  |  |  |  |  |  |  |  |  |  | 179,379 |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Commitments |  |  |  |  |  |  | 62,500 |  |  |  |  |  |  |  |
Fair value of investment in restricted shares |  | 95,066 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares issued and outstanding of Galileo | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of Galileo shares | 600,000 | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of Galileo | $ 54,528 | $ 54,528 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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