Investments - Additional Information (Detail) (USD $)	Mar. 31, 2014		Jun. 30, 2013		Dec. 31, 2013 Government Fund Mutual funds
Schedule of Trading Securities and Other Trading Assets [Line Items]
Carrying value of investments held	$ 25,300,000
Cost basis of investments held	24,600,000
Carrying value of investments to Company's total assets	69.30%
Other investments	385,439		0
Trading securities, at fair value	$ 18,645,573	[1]	$ 4,758,220	[1]	$ 14,118,943

[1] Unrealized and realized gains and losses on trading securities are included in earnings in the statement of operations.