Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Common Stock Repurchase (Details) - USD ($)	3 Months Ended	12 Months Ended
Common Stock Repurchase (Details) - USD ($)	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Apr. 24, 2018	May 02, 2017	Apr. 26, 2016
Shares repurchased, value		$ 748,000	$ 938,000	$ 550,000
May 2018 authorized repurchase program
Stock repurchase program, authorized amount					$ 20,000,000
Shares repurchased		0
May 2017 authorized repurchase program
Stock repurchase program, authorized amount						$ 20,000,000
Shares repurchased	28,691
Shares repurchased, value	$ 300,000
April 2016 authorized repurchase program
Stock repurchase program, authorized amount							$ 15,000,000
Shares repurchased		0