Quarterly Results Of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Quarterly Results Of Operations [Abstract]
Revenues	$ 13,455,001	$ 11,748,888	$ 14,679,034	$ 30,999,170	$ 27,887,446	$ 18,374,977	$ 19,752,045	$ 18,396,756	$ 70,882,093	$ 84,411,224	$ 62,889,120
Income (loss) before provision for income taxes	(848,681)	(496,946)	627,207	14,875,761	13,583,986	7,627,585	8,445,573	7,164,318	14,157,341	36,821,462	20,690,049
Net income (loss)	$ (887,681)	$ (728,946)	$ 704,207	$ 10,233,761	$ 9,297,986	$ 5,122,585	$ 5,654,573	$ 4,926,318	$ 9,321,341	$ 25,001,462	$ 13,960,049
Earnings (loss) per share	$ (0.05)	$ (0.04)	$ 0.04	$ 0.61	$ 0.55	$ 0.31	$ 0.34	$ 0.29	$ 0.56	$ 1.49	$ 0.84