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Stock Compensation Plans And Stock Based Compensation: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Shares:    
Options outstanding, beginning of period (shares) 341,300 221,400
Exercised (shares) (10,220) (5,300)
Forfeited (shares) (2,900) (200)
Options outstanding, end of period (shares) 328,180 215,900
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 8.73 $ 7.49
Exercised (dollars per share) 8.37 4.62
Forfeited (dollars per share) 9.96 4.55
Options outstanding, end of period (dollars per share) $ 8.73 $ 7.57