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Earnings (Loss) per Share Data - Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]                
Net Income (Loss) $ (1,015,000) $ 439,000 $ (274,000) $ 2,335,000 $ 2,288,000 $ 1,551,000 $ (850,000) $ 6,174,000
Common Shares:                
Weighted average common shares outstanding 14,658,000     14,617,000     14,658,000 14,613,000
Effect of dilutive stock options 0     132,000     0 129,000
Diluted shares outstanding 14,658,000     14,749,000     14,658,000 14,742,000
Basic:                
Net income (loss) per share $ (0.07)     $ 0.16     $ (0.06) $ 0.42
Diluted:                
Net income (loss) per share $ (0.07)     $ 0.16     $ (0.06) $ 0.42