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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 313,000	$ 2,346,000
Common Shares:
Weighted average common shares outstanding	14,541,000	14,458,000
Effect of dilutive stock options	158,000	265,000
Weighted-average diluted shares outstanding	14,699,000	14,723,000
Basic:
Net income per share	$ 0.02	$ 0.16
Diluted:
Net income per share	$ 0.02	$ 0.16

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