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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options
 12 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 380,820
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 16.03
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 12 days
Options Exercisable, Number (in shares) | shares 184,070.00
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 11.04
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 11 months 12 days
$ 4.01 - 4.55  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 2,500
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.23
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 30 days
Options Exercisable, Number (in shares) | shares 2,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.23
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 2 years 3 months 30 days
Exercise price range, lower range limit (in dollars per share) $ 4.01
Exercise price range, upper range limit (in dollars per share) $ 4.01
5.86 - 6.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 28,550
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 5.96
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 21 days
Options Exercisable, Number (in shares) | shares 28,550
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.96
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 4 years 21 days
Exercise price range, lower range limit (in dollars per share) $ 5.86
Exercise price range, upper range limit (in dollars per share) $ 5.86
9.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 72,800
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 30 days
Options Exercisable, Number (in shares) | shares 54,600
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 5 years 30 days
Exercise price range, lower range limit (in dollars per share) $ 9
10.26 - 10.71  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 121,320
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 10.58
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 6 months 15 days
Options Exercisable, Number (in shares) | shares 67,420
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 10.56
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 6 years 5 months 24 days
Exercise price range, lower range limit (in dollars per share) $ 10.26
Exercise price range, upper range limit (in dollars per share) $ 10.26
15.67  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 52,200
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years
Options Exercisable, Number (in shares) | shares 19,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 8 years
Exercise price range, lower range limit (in dollars per share) $ 15.67
29.69  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 57,500
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 9 years
Options Exercisable, Number (in shares) | shares 11,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years) 9 years
Exercise price range, lower range limit (in dollars per share) $ 29.69
31.80  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number (in shares) | shares 45,950
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 10 years
Options Exercisable, Number (in shares) | shares 0
Exercise price range, lower range limit (in dollars per share) $ 31.8