Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Numerator for basic and diluted earnings per share:
Net income (loss)	$ 182,621	$ 3,100,299	$ 675,966	$ 3,412,110	$ 2,644,381	$ 2,650,429	$ 1,772,253	$ 1,426,849	$ 7,370,996	$ 8,493,912	$ 11,419,690
Denominator for basic and diluted earnings per share
weighted average shares (including for 2012, 2011 and 2010, unissued, vested directors' shares of 114,596, 122,728 and 111,491, respectively)									8,360,931	8,393,890	8,422,387