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EARNINGS PER SHARE: (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
EARNINGS PER SHARE:    
Anti-dilutive awards excluded from the computation of diluted earnings per share (in shares) 500 5,950
Average exercise price of anti-dilutive awards excluded from the computation of diluted earnings per share (in dollars per share) $ 65.97 $ 54.53
Weighted average common shares outstanding 622,904 614,046
Weighted average of net additional shares outstanding assuming dilutive options exercised and proceeds used to purchase treasury stock and conversion of preferred stock 128,908 170,062
Weighted average number of shares outstanding, Diluted 751,812 784,108
Net income $ 5,858,672 $ 7,367,562
Deduct: convertible preferred stock dividends (205,218) (269,095)
Net income available to common shareholders 5,653,454 7,098,467
Net income available to common shareholders, diluted $ 5,858,672 $ 7,367,562
Net earnings per share available to common shareholders, Basic (in dollars per share) $ 9.08 $ 11.56
Net earnings per share available to common shareholders, Diluted (in dollars per share) $ 7.79 $ 9.40