EARNINGS PER SHARE: (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
EARNINGS PER SHARE:
Anti-dilutive awards excluded from the computation of diluted earnings per share (in shares)		500
Average exercise price of anti-dilutive awards excluded from the computation of diluted earnings per share (in dollars per share)		$ 65.97
Weighted average common shares outstanding, Basic	610,392	622,904
Weighted average of net additional shares outstanding assuming dilutive options exercised and proceeds used to purchase treasury stock and conversion of preferred stock	124,835	128,908
Weighted average number of shares outstanding, Diluted	735,227	751,812
Net income	$ 4,959,528	$ 5,858,672
Deduct: convertible preferred stock dividends	(195,105)	(205,218)
Net income available to common shareholders	4,764,423	5,653,454
Net income available to common shareholders, diluted	$ 4,959,528	$ 5,858,672
Net earnings per share available to common shareholders, Basic (in dollars per share)	$ 7.81	$ 9.08
Net earnings per share available to common shareholders, Diluted (in dollars per share)	$ 6.75	$ 7.79