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Stock Compensation Plans: Stock Options by Exercise Price (Details) - Stock Options	12 Months Ended
	Sep. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	380,120
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 13.23
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 5 months 6 days
Options Exercisable, Number (in shares) | shares	148,270.00
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.95
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 years 3 months 6 days
$ 4.01 - 4.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	10,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 4.28
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	3 years 1 month 15 days
Options Exercisable, Number (in shares) | shares	10,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 4.28
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	3 years 1 month 15 days
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	40,600
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.93
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 15 days
Options Exercisable, Number (in shares) | shares	35,100
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.92
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	5 years 15 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	80,800
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	6 years 30 days
Options Exercisable, Number (in shares) | shares	42,400
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.00
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	6 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	136,270
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.58
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	7 years 6 months 18 days
Options Exercisable, Number (in shares) | shares	50,570
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.57
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	7 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)	$ 10.71
15.67
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Number (in shares) | shares	54,200
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.67
Options Outstanding, Weighted Average Remaining Contractual Life (Years)	9 years
Options Exercisable, Number (in shares) | shares	10,200
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.67
Options Exercisable, Weighted Average Remaining Contractual Life (Years)	9 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	58,250
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 29.69
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)	$ 29.69

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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The ceiling 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.

+ References

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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-Publisher FASB
-Name Accounting Standards Codification
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