Fair Value Disclosures - Fair Value Measurements on Recurring Basis (Detail) (USD $)	Mar. 31, 2013	Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Investments	$ 14,185,973	$ 14,040,450
Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	4,994,000
Total available-for-sale securities	9,192,000
Total Investments	14,186,000
Recurring basis [Member] | Common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	30,000
Total available-for-sale securities	1,351,000
Recurring basis [Member] | Mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	4,057,000
Total available-for-sale securities	2,764,000
Recurring basis [Member] | Offshore fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	907,000
Total available-for-sale securities	4,914,000
Recurring basis [Member] | Venture capital investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	163,000
Quoted Prices (Level 1) [Member] | Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	4,087,000
Total available-for-sale securities	4,115,000
Total Investments	8,202,000
Quoted Prices (Level 1) [Member] | Recurring basis [Member] | Common stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	30,000
Total available-for-sale securities	1,351,000
Quoted Prices (Level 1) [Member] | Recurring basis [Member] | Mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	4,057,000
Total available-for-sale securities	2,764,000
Significant Other Inputs (Level 2) [Member] | Offshore fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	907,000
Total available-for-sale securities	4,914,000
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	907,000
Total available-for-sale securities	4,914,000
Total Investments	5,821,000
Significant Other Inputs (Level 2) [Member] | Recurring basis [Member] | Offshore fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total trading securities	907,000
Total available-for-sale securities	4,914,000
Significant Unobservable Inputs (Level 3) [Member] | Recurring basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	163,000
Total Investments	163,000
Significant Unobservable Inputs (Level 3) [Member] | Recurring basis [Member] | Mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	163,000
Significant Unobservable Inputs (Level 3) [Member] | Recurring basis [Member] | Venture capital investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total available-for-sale securities	$ 163,000