Nature of Operations and Summary of Significant Accounting Policies - Basic and Diluted EPS (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ (372,000)	$ 5,805,000
Basic shares outstanding	14,658,000	14,614,000
Common Stock Equivalents	0	116,000
Diluted shares outstanding	14,658,000	14,730,000
Basic earnings per common share:
Basic earnings per share	$ (0.03)	$ 0.4
Diluted earnings per common share:
Diluted earnings per share	$ (0.03)	$ 0.39