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Investments - Components of Company's Available-for-Sale Investments (Detail) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Cost $ 7,536,833 $ 8,064,902
Available-for-sale securities, Gross Unrealized Gains 920,000 1,289,000
Available-for-sale securities, Gross Unrealized (Losses) (233,000) (301,000)
Available-for-sale securities, Market Value 8,223,809 9,053,111
Common Stock [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Cost 842,000 870,000
Available-for-sale securities, Gross Unrealized Gains 900,000 529,000
Available-for-sale securities, Gross Unrealized (Losses) (3,000) (5,000)
Available-for-sale securities, Market Value 1,739,000 1,394,000
Venture capital investments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Cost 168,000 168,000
Available-for-sale securities, Gross Unrealized (Losses) (5,000) (5,000)
Available-for-sale securities, Market Value 163,000 163,000
Offshore Fund [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Cost 5,000,000 5,000,000
Available-for-sale securities, Gross Unrealized (Losses) (222,000) (288,000)
Available-for-sale securities, Market Value 4,778,000 4,712,000
Mutual funds [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Cost 1,527,000 2,027,000
Available-for-sale securities, Gross Unrealized Gains 20,000 760,000
Available-for-sale securities, Gross Unrealized (Losses) (3,000) (3,000)
Available-for-sale securities, Market Value $ 1,544,000 $ 2,784,000