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Earnings (Loss) per Share Data - Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]    
Net Income (Loss) $ 3,476,000 $ (274,000)
Common Shares:    
Weighted average common shares outstanding 14,657,000 14,617,000
Effect of dilutive stock options (none) 0 0
Diluted shares outstanding 14,657,000 14,617,000
Basic:    
Net income (loss) per share $ 0.24 $ (0.02)
Diluted:    
Net income (loss) per share $ 0.24 $ (0.02)