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Stock Compensation Plans (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 28, 2020
Dec. 31, 2018
Jan. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate intrinsic value of options exercised during the period $ 628 $ 610      
Number of unvested stock options (shares) 154,670 169,650      
Unvested stock options, aggregate grant date fair value $ 584 $ 513      
Unvested stock options, aggregate intrinsic value $ 222        
Stock options vested during period (shares) 0 23,400      
Stock options vested during period, aggregate grant date fair value   $ 218      
Stock options, outstanding, aggregate intrinsic value $ 1,410 $ 4,220      
Unrecognized compensation expense, non-vested options $ 510        
Unrecognized compensation expense, non-vested options, amortization period (in years) 2 years 2 months 27 days        
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]          
Contractual term 10 years        
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 37,726        
Equity Incentive Plan 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized 350,000   350,000    
MRDP | Stock Grant Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock grants awarded (shares) 0 0