Fair Value Disclosures - Fair Value Measurements on Recurring Basis (Detail) (USD $) | Dec. 31, 2013 | Jun. 30, 2013 |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | $18,640,758 | $4,758,220 |
Available-for-sale, market value | 7,343,679 | 9,053,111 |
Total investments, market value | 25,984,437 | 13,811,331 |
Common stock | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 16,000 | ' |
Available-for-sale, market value | 2,732,000 | 1,394,000 |
Preferred stock | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 197,000 | ' |
Corporate debt | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 1,492,000 | ' |
Venture capital investments | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 163,000 | ' |
Offshore funds | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 877,000 | ' |
Available-for-sale, market value | ' | 4,712,000 |
Mutual funds | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 17,748,000 | ' |
Available-for-sale, market value | 2,759,000 | 2,784,000 |
Quoted Prices (Level 1) | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 17,764,000 | ' |
Available-for-sale, market value | 5,755,000 | ' |
Total investments, market value | 23,519,000 | ' |
Quoted Prices (Level 1) | Common stock | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 16,000 | ' |
Available-for-sale, market value | 2,638,000 | ' |
Quoted Prices (Level 1) | Preferred stock | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 106,000 | ' |
Quoted Prices (Level 1) | Corporate debt | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 252,000 | ' |
Quoted Prices (Level 1) | Venture capital investments | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 0 | ' |
Quoted Prices (Level 1) | Offshore funds | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Quoted Prices (Level 1) | Mutual funds | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 17,748,000 | ' |
Available-for-sale, market value | 2,759,000 | ' |
Significant Other Inputs (Level 2) | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 877,000 | ' |
Available-for-sale, market value | 990,000 | ' |
Total investments, market value | 1,867,000 | ' |
Significant Other Inputs (Level 2) | Common stock | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Available-for-sale, market value | 0 | ' |
Significant Other Inputs (Level 2) | Preferred stock | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 0 | ' |
Significant Other Inputs (Level 2) | Corporate debt | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 990,000 | ' |
Significant Other Inputs (Level 2) | Venture capital investments | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 0 | ' |
Significant Other Inputs (Level 2) | Offshore funds | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 877,000 | ' |
Significant Other Inputs (Level 2) | Mutual funds | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Available-for-sale, market value | 0 | ' |
Significant Unobservable Inputs (Level 3) | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Available-for-sale, market value | 598,000 | ' |
Total investments, market value | 598,000 | ' |
Significant Unobservable Inputs (Level 3) | Common stock | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Available-for-sale, market value | 94,000 | ' |
Significant Unobservable Inputs (Level 3) | Preferred stock | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 91,000 | ' |
Significant Unobservable Inputs (Level 3) | Corporate debt | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 250,000 | ' |
Significant Unobservable Inputs (Level 3) | Venture capital investments | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Available-for-sale, market value | 163,000 | ' |
Significant Unobservable Inputs (Level 3) | Offshore funds | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Significant Unobservable Inputs (Level 3) | Mutual funds | Recurring basis | ' | ' |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] | ' | ' |
Trading securities, at fair value | 0 | ' |
Available-for-sale, market value | $0 | ' |