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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]    
Net income $ 1,394,000 $ 1,575,000
Common Shares:    
Weighted-average common shares outstanding 14,380,000 14,307,000
Effect of dilutive stock options 209,000 118,000
Weighted-average diluted shares outstanding 14,589,000 14,425,000
Basic:    
Net income per share [1] $ 0.10 $ 0.11
Diluted:    
Net income per share [1] $ 0.10 $ 0.11
[1] Prior year adjusted for three-for-two stock split