Earnings per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net Income	$ 1,551,000	$ 2,489,000
Common Shares:
Weighted average common shares outstanding	14,606,000	14,586,000
Effect of dilutive stock options	123,000	134,000
Diluted shares outstanding	14,729,000	14,720,000
Basic:
Net earnings per share	$ 0.11	$ 0.17
Diluted:
Net earnings per share	$ 0.11	$ 0.17