Quarterly Results Of Operations (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Quarterly Results Of Operations [Abstract]
Revenues	$ 18,396,254	$ 17,730,445	$ 12,581,986	$ 14,180,435	$ 11,041,382	$ 13,649,692	$ 10,436,910	$ 13,404,333	$ 62,889,120	$ 48,532,317	$ 44,976,651
Income (loss) before provision for income taxes	8,780,096	7,323,168	1,761,487	2,825,298	496,621	4,681,299	1,205,966	4,261,110	20,690,049	10,644,996	11,685,912
Net income (loss)	$ 5,719,096	$ 5,070,168	$ 1,022,487	$ 2,148,298	$ 182,621	$ 3,100,299	$ 675,966	$ 3,412,110	$ 13,960,049	$ 7,370,996	$ 8,493,912
Earnings (loss) per share	$ 0.68	$ 0.61	$ 0.12	$ 0.26	$ 0.02	$ 0.37	$ 0.08	$ 0.41	$ 1.67	$ 0.88	$ 1.01