Investments - Investment Income (Loss) Reflected in Earnings (Detail) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Marketable Securities, Gain (Loss) [Abstract]
Realized gains on sales of available-for-sale securities	$ (182,673)	$ 217,200	$ 692,673	$ 217,200
Realized losses on sales of trading securities	(168,218)	(244,627)	(168,218)	(244,627)
Unrealized gains on trading securities	169,488	177,158	278,191	348,739
Realized foreign currency gains (losses)	(452)	(2,726)	4,527	(2,751)
Other-than-temporary declines in available-for sale securities	0	(41,837)	0	(41,837)
Dividend and interest income	230,080	55,819	301,702	84,914
Total Investment Income	$ 48,225	$ 160,987	$ 1,108,875	$ 361,638