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Earnings (Loss) per Share Data - Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)	3 Months Ended						9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net Income (loss)	$ 3,212,000	$ 4,873,000	$ 3,476,000	$ (1,015,000)	$ 439,000	$ (274,000)	$ 11,561,000	$ (850,000)
Common Shares:
Weighted average common shares outstanding	14,658,000			14,658,000			14,658,000	14,658,000
Effect of dilutive stock options	0			0			0	0
Diluted shares outstanding	14,658,000			14,658,000			14,658,000	14,658,000
Basic income (loss) per common share	$ 0.22			$ (0.07)			$ 0.79	$ (0.06)
Diluted income (loss) per common share	$ 0.22			$ (0.07)			$ 0.79	$ (0.06)

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Reference 35: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 45
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No definition available.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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