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Earnings per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income	$ 439,000	$ (274,000)	$ 2,288,000	$ 1,551,000	$ 165,000	$ 3,839,000
Common Shares:
Weighted average common shares outstanding	14,658,000		14,614,000		14,658,000	14,611,000
Effect of dilutive stock options	0		133,000		0	129,000
Diluted shares outstanding	14,658,000		14,747,000		14,658,000	14,740,000
Basic:
Net income per share	$ 0.03		$ 0.16		$ 0.01	$ 0.26
Diluted:
Net income per share	$ 0.03		$ 0.16		$ 0.01	$ 0.26

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Reference 35: http://www.xbrl.org/2003/role/disclosureRef
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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
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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
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