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Investments - Summary of Investments Measured at Fair Value on a Recurring Basis (Detail) (USD $)
12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Venture capital investments [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 168,000 $ 243,000
Return of capital   (19,000)
Total gains or losses (realized/unrealized)    
Included in earnings (investment income)   160,000
Included in other comprehensive income (5,000) (108,000)
Purchases, sales, issuances, and settlements   (108,000)
Ending Balance 162,841 168,000
Common stock [Member]
   
Total gains or losses (realized/unrealized)    
Included in earnings (investment income)      
Included in other comprehensive income      
Purchases, sales, issuances, and settlements 95,000  
Transfers in and/or out of Level 3      
Ending Balance $ 95,000