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Stock Compensation Plans (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jan. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options, outstanding, aggregate intrinsic value $ 4,120 $ 1,280  
Number of unvested stock options (shares) 216,750 226,100  
Unvested stock options, aggregate grant date fair value $ 424 $ 486  
Unvested stock options, aggregate intrinsic value $ 2,390    
Stock options vested during period (shares) 33,700 33,700  
Stock options vested during period, aggregate grant date fair value $ 82 $ 82  
Aggregate intrinsic value of options exercised during the period 413 $ 38  
Unrecognized compensation expense, non-vested options $ 345    
Unrecognized compensation expense, non-vested options, amortization period (in years) 1 year 11 months 1 day    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 300,000    
Award vesting percentage 20.00%    
Award vesting period (years) 5 years    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of unvested shares 0 0  
Equity Incentive Plan 2014      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized     352,366
Number of shares available for grant 171,116    
MRDP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 0