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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income	$ 2,682,000	$ 2,588,000	$ 8,791,000	$ 7,397,000
Common Shares:
Weighted average common shares outstanding	14,492,000	14,400,000	14,477,000	14,390,000
Effect of dilutive stock options	232,000	299,000	247,000	290,000
Diluted shares outstanding	14,724,000	14,699,000	14,724,000	14,680,000
Basic:
Net earnings per share	$ 0.19	$ 0.18	$ 0.61	$ 0.51
Diluted:
Net earnings per share	$ 0.18	$ 0.18	$ 0.60	$ 0.50

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