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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