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Earning Per Share Data - Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
 3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]    
Net income (loss) $ 1,575,000 $ (1,096,000)
Common Shares:    
Weighted-average common shares outstanding 9,538,000 9,519,000
Effect of dilutive stock options 79,000 0
Weighted-average diluted shares outstanding 9,617,000 9,519,000
Basic:    
Net income (loss) per share $ 0.16 $ (0.12)
Diluted:    
Net income (loss) per share $ 0.16 $ (0.12)