Significant Accounting Policies (Tables)

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Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2013
Accounting Policies [Abstract]
Major components of net realized and unrealized gain on trading securities	The major components of net realized and unrealized gain or loss on trading securities for the three and six months ended June 30, 2013 and May 31, 2012 are as follows: Major Components of Net Realized and Unrealized Gain (Loss) on Trading Securities     For the Three Months Ended   For the Six Months Ended     June 30, 2013   May 31, 2012   June 30, 2013   May 31, 2012   Net unrealized gain (loss) on trading securities   $ —   $ (3,600,082 )   $ 751,004   $ (737,810 )   Net realized gain (loss) on trading securities   —   —   (434,941 )   —   Total net realized and unrealized gain (loss) on trading securities   $ —   $ (3,600,082 )   $ 316,063   $ (737,810 )