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Investments - Investment Income Reflected in Earnings (Detail) (USD $)
3 Months Ended 9 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Gain (Loss) on Investments [Line Items]        
Realized gains on sales of available-for-sale securities $ 17,509 $ 179,379 $ 234,709 $ 179,379
Realized losses on sales of trading securities     (244,627) (2,638)
Unrealized gains (losses) on trading securities (68,267) 277,192 280,472 (201,860)
Realized foreign currency gains (losses) 4,409 (253) 1,658 (646)
Other-than-temporary declines in available-for-sale securities    (19,036) (41,837) (19,073)
Dividend and interest income 30,268 27,581 115,182 101,094
Total Investment Income $ (16,081) $ 464,863 $ 345,557 $ 56,256