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Earnings Per Share - Earnings per share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Earnings Per Share [Abstract]      
Weighted average common shares oustanding during the period-shares used for basic earnings per common share 9,360 9,284 9,182
Common shares issuable under share based payment plans which are potentially dilutive 114 167 242
Common shares used for diluted earnings per common share 9,474 9,451 9,424
Net income $ 7,808 $ 12,211 $ 7,371
Basic $ 0.83 $ 1.32 $ 0.80
Diluted $ 0.82 $ 1.29 $ 0.78