Investments - Investment Income (Loss) Reflected in Earnings (Detail) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Realized gains on sales of available-for-sale securities	$ 306,669	$ 17,509	$ 999,342	$ 234,709
Realized losses on sales of trading securities	(146)	0	(168,364)	(244,627)
Unrealized gains (losses) on trading securities	5,539	(68,267)	283,731	280,472
Realized foreign currency gains	1,939	4,409	6,466	1,658
Other-than-temporary declines in available-for sale securities	(2,972)	0	(2,972)	(41,837)
Dividend and interest income	62,512	30,268	364,213	115,182
Total Investment Income (Loss)	$ 373,541	$ (16,081)	$ 1,482,416	$ 345,557