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Stock Compensation Plans: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Shares:    
Options outstanding, beginning of period (shares) 373,130 341,300
Exercised (shares) (12,700) (5,300)
Forfeited (shares) 0 (400)
Options outstanding, end of period (shares) 360,430 335,600
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 9.82 $ 8.73
Exercised (dollars per share) 6.31 7.88
Forfeited (dollars per share) 0.00 5.86
Options outstanding, end of period (dollars per share) $ 9.94 $ 8.74