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Stock Compensation Plans: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Shares:    
Options outstanding, beginning of period (shares) 380,120 373,130
Exercised (shares) (29,150) (30,710)
Forfeited (shares) (4,650) (4,200)
Options outstanding, end of period (shares) 346,320 338,220
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 13.23 $ 9.82
Exercised (dollars per share) 8.05 6.30
Forfeited (dollars per share) 11.64 4.60
Options outstanding, end of period (dollars per share) $ 13.69 $ 10.21