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Investments - Additional Information (Detail) (USD $)
 9 Months Ended 12 Months Ended 12 Months Ended
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