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Earning Per Share Data - Basic and Diluted Earnings Per Share (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]        
Net income $ 1,630,000 $ 1,184,000 $ 3,205,000 $ 89,000
Common Shares:        
Weighted average common shares outstanding 9,546,000 9,519,000 9,543,000 9,519,000
Effect of dilutive stock options 113,000 65,000 97,000 69,000
Diluted shares outstanding 9,659,000 9,584,000 9,640,000 9,588,000
Basic:        
Net earnings per share $ 0.17 $ 0.12 $ 0.34 $ 0.01
Diluted:        
Net earnings per share $ 0.17 $ 0.12 $ 0.33 $ 0.01