EARNINGS PER SHARE: (Details) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
EARNINGS PER SHARE:
Anti-dilutive securities not included in the computation of diluted earnings per share (in shares)	5,950
Average exercise price of stock options (in dollars per share)	$ 54.53
Weighted average common shares outstanding, Basic	614,046	594,185
Weighted average of net additional shares outstanding assuming dilutive options exercised and proceeds used to purchase treasury stock and conversion of preferred stock	170,062	178,404
Weighted average number of shares outstanding, Diluted	784,108	772,589
Income from operations	$ 7,367,562	$ 8,064,036
Deduct: convertible preferred stock dividends	(269,095)	(286,397)
Net income available to common shareholders	$ 7,098,467	$ 7,777,639
Net earnings per share available to common shareholders, Basic (in dollars per share)	$ 11.56	$ 13.09
Net earnings per share available to common shareholders, Diluted (in dollars per share)	$ 9.40	$ 10.44