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EQUITY-BASED INCENTIVE AWARDS - Authorized and Approved Restricted Stock Unit Awards (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Sep. 30, 2019
Sep. 30, 2018
Restricted Stock Units            
Restricted stock units            
Original number of awards issued         15,050  
Non-vested awards outstanding at the end of the period (in shares)         28,151 26,811
Direct cost to the recipients of the restricted stock units         $ 0  
Compensation expense related to the amortization of all equity - based compensation awards         1,200,000 $ 1,200,000
Tax benefit related to compensation expense         300,000 300,000
Total intrinsic value of equity-based compensation awards vested         1,100,000 $ 1,200,000
Total unamortized compensation expense         $ 1,200,000  
Period over which unamortized compensation expense is expected to be amortized         16 months  
Restricted Stock Units Awarded October 2015            
Restricted stock units            
Original number of awards issued       13,250    
Estimated fair value of award at grant date       $ 1,112,000    
Non-vested awards outstanding at the end of the period (in shares)         100  
Fair value of non-vested awards at the end of the period         $ 8,000  
Vested as of the end of the period (in shares)         13,150  
Units scheduled to vest         100  
Restricted Stock Units Awarded October 2015 | Minimum            
Restricted stock units            
Service period       36 months    
Restricted Stock Units Awarded October 2015 | Maximum            
Restricted stock units            
Service period       60 months    
Restricted Stock Units Awarded October 2016            
Restricted stock units            
Original number of awards issued     13,000      
Service period     36 months      
Estimated fair value of award at grant date     $ 1,191,000      
Non-vested awards outstanding at the end of the period (in shares)         4,334  
Fair value of non-vested awards at the end of the period         $ 330,000  
Vested as of the end of the period (in shares)         8,666  
Units scheduled to vest         4,334  
Restricted Stock Units Awarded October 2017            
Restricted stock units            
Original number of awards issued   13,000        
Service period   36 months        
Estimated fair value of award at grant date   $ 1,177,000        
Non-vested awards outstanding at the end of the period (in shares)         8,667  
Fair value of non-vested awards at the end of the period         $ 661,000  
Vested as of the end of the period (in shares)         4,333  
Restricted Stock Units Awarded October 2017 | Vest in October 2019            
Restricted stock units            
Units scheduled to vest         4,333  
Restricted Stock Units Awarded October 2017 | Vest in October 2020            
Restricted stock units            
Units scheduled to vest         4,334  
Restricted Stock Units Awarded October 2018            
Restricted stock units            
Original number of awards issued 15,050          
Service period 36 years          
Estimated fair value of award at grant date $ 1,264,000          
Non-vested awards outstanding at the end of the period (in shares) 15,050          
Fair value of non-vested awards at the end of the period $ 1,148,000          
Units scheduled to vest         15,050