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Stock Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
Mar. 31, 2013
Stock options
Mar. 31, 2012
Stock options
Mar. 31, 2013
Stock options
Mar. 31, 2012
Stock options
Mar. 31, 2013
Restricted stock
Mar. 31, 2012
Restricted stock
Mar. 31, 2013
Restricted stock
Mar. 31, 2012
Restricted stock
Mar. 31, 2013
Restricted stock units
Mar. 31, 2012
Restricted stock units
Jan. 28, 2010
1991 Stock Option Plan
Stock options
Jan. 28, 2010
2010 Stock Incentive Plan
Jan. 28, 2010
2010 Stock Incentive Plan
Maximum
Mar. 31, 2013
2010 Stock Incentive Plan
Stock options
Jan. 28, 2010
2001 Stock Incentive Plan
Stock options
Stock Based Compensation                              
Granted - options (in shares) 0 0 0 0             0       0
Number of shares of common stock authorized for issuance                       1,000,000      
Period during which awards may be granted                         10 years    
Shares available for issuance                           197,218  
Compensation expense (in dollars) $ 76,000 $ 186,000 $ 208,000 $ 474,000 $ 105,000 $ 62,000 $ 176,000 $ 90,000              
Unamortized compensation cost (in dollars)         $ 985,000   $ 985,000                
Unamortized cost is expected to be recognized over a weighted-average period     1 year 3 months 18 days       2 years 2 months 12 days                
Restricted Stock                              
Unvested balance at the beginning of the period (in shares)             99,883 40,000              
Granted (in shares)             49,843 61,883              
Vested (in shares)             (6,361)                
Forfeited/Cancelled (in shares)             (8,000)                
Unvested balance at the end of the period (in shares)         135,365 101,883 135,365 101,883              
Restricted Stock, Weighted Average Grant Date Fair Value                              
Unvested balance at the beginning of the period (in dollars per shares)             $ 9.11 $ 10.99              
Granted (in dollars per shares)             $ 11.68 $ 7.86 $ 11.68 $ 7.86          
Vested (in dollars per shares)             $ 7.86                
Forfeited/Cancelled (in dollars per share)             $ 7.86                
Unvested balance at the end of the period (in dollars per shares)         $ 10.19 $ 9.09 $ 10.19 $ 9.09              
Restricted stock units                              
Number of units issued                 116,314 135,491