Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Financial Information

The following summarized (unaudited) quarterly financial information presents the results of operations and other data for three-month periods ended March 31, June 30, September 30 and December 31, 2014 and 2013.

	First Quarter 2014		Second Quarter 2014		Third Quarter 2014		Fourth Quarter 2014
Total income (loss)	$	1,636,925	$	4,045,515	$	(6,424,544)	$	(17,575,229)
Total expenses		145,584		132,839		115,775		94,542
Net income (loss)	$	1,491,341	$	3,912,676	$	(6,540,319)	$	(17,669,771)
Net income (loss) per share	$	1.27	$	3.07	$	(5.37)	$	(15.21)

	First Quarter 2013		Second Quarter 2013		Third Quarter 2013		Fourth Quarter 2013
Total income (loss)	$	3,488,007	$	(2,281,454)	$	5,892,884	$	(678,456)
Total expenses		247,095		220,417		205,028		170,197
Net income (loss)	$	3,240,912	$	(2,501,871)	$	5,687,856	$	(848,653)
Net income (loss) per share	$	1.22	$	(0.96)	$	3.12	$	(0.36)