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Investments - Investment Income (Loss) Reflected in Earnings (Detail) (USD $)
12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Marketable Securities Gain Loss [Abstract]      
Realized losses on sales of trading securities $ (244,627) $ (2,638)  
Realized gains on sales of available-for-sale securities 265,641 179,379 139,458
Unrealized gains (losses) on trading securities 44,728 (485,139) 631,192
Realized foreign currency gains (losses) 1,255 (1,583) 3,013
Other-than-temporary declines in available-for-sale securities (47,459) (19,073) (3,699)
Dividend and interest income 188,501 152,093 238,604
Total Investment Income (Loss) $ 208,039 $ (176,961) $ 1,008,568