Earnings per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net Income (loss)	$ (274,000)	$ 1,551,000
Common Shares:
Weighted average common shares outstanding	14,617,000	14,606,000
Effect of dilutive stock options	0	123,000
Diluted shares outstanding	14,617,000	14,729,000
Basic:
Net income (loss) per share	$ (0.02)	$ 0.11
Diluted:
Net income (loss) per share	$ (0.02)	$ 0.11