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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options	12 Months Ended
	Sep. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	378,304
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 18.15
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 8 months 3 days
Options Exercisable, Number (in shares) | shares	217,554.000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 13.21
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 5 months 27 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)	$ 4.33
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	11 months
Options Exercisable, Number (in shares) | shares	2,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.33
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	11 months
Exercise price range, lower range limit (in dollars per share)	$ 4.01
Exercise price range, upper range limit (in dollars per share)	$ 4.55
5.86 - 6.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	19,100
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.97
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 24 days
Options Exercisable, Number (in shares) | shares	19,100
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.97
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 24 days
Exercise price range, lower range limit (in dollars per share)	$ 5.86
Exercise price range, upper range limit (in dollars per share)	$ 6.00
9.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	49,975
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	4 years 30 days
Options Exercisable, Number (in shares) | shares	49,975
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	4 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	110,839
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.58
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 6 months 18 days
Options Exercisable, Number (in shares) | shares	87,589
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.57
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 5 months 27 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	48,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years
Options Exercisable, Number (in shares) | shares	27,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 years
Exercise price range, lower range limit (in dollars per share)	$ 15.67
27.14
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	46,840
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 27.14
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)	$ 27.14
29.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	55,600
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 29.69
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	8 years
Options Exercisable, Number (in shares) | shares	22,300
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 29.69
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	8 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	45,450
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.80
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	9 years
Options Exercisable, Number (in shares) | shares	9,090
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.80
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	9 years
Exercise price range, lower range limit (in dollars per share)	$ 31.8

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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