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Shareholders' Equity - Narrative (Details)
 1 Months Ended 12 Months Ended 105 Months Ended
Sep. 14, 2020
Feb. 25, 2020
USD ($)
Feb. 20, 2020
$ / shares
shares
Jun. 24, 2016
USD ($)
shares
Aug. 31, 2020
holder
shares
Sep. 30, 2020
USD ($)
day
vote
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2020
USD ($)
vote
$ / shares
shares
Dec. 20, 2011
USD ($)
Stockholders Equity Note [Line Items]                    
Number of voting rights per share, common stock | vote           1     1  
Preferred stock, shares authorized | shares           10,000,000 10,000,000   10,000,000  
Preferred stock, par value (in dollars per share)           $ 0.0001 $ 0.0001   $ 0.0001  
Preferred stock, shares issued | shares           700,000 700,000   700,000  
Stock issuance costs | $       $ 1,200,000            
Preferred stock cash dividends declared | $           $ 5,264,000 $ 5,250,000 $ 5,250,000    
Preferred stock, liquidation preference (in dollars per share)           $ 100 $ 100   $ 100  
Affiliated Holders | holder         6          
Unaffiliated Holders | holder         12          
Affiliated holder, conversion cap 180 days                  
Volume weighted average price, conversion rate if exceeded           2.5     2.5  
Conversion Trigger | day           20        
Conversion Cap           120 days        
Notice of conversion           10 days        
Common stock, par value (in dollars per share)           $ 0.0001 $ 0.0001   $ 0.0001  
Net proceeds from the Offering | $   $ 49,200,000                
Repurchase of common stock authorized by Board of Directors | $                   $ 25,000,000.0
Purchased shares (in shares) | shares                 1,677,570  
Average price per share                 $ 9.09  
Aggregate cost of treasury stock repurchased during the period | $                 $ 15,300,000  
Preferred Stock Including Additional Paid in Capital                    
Stockholders Equity Note [Line Items]                    
Proceeds from sale | $       $ 70,000,000.0            
Public Offering                    
Stockholders Equity Note [Line Items]                    
Aggregate shares sold (in shares) | shares     6,782,610              
Common stock, par value (in dollars per share)     $ 0.0001              
Sale of stock (in dollars per share)     $ 7.75              
Direct costs | $           $ 400,000        
Treasury stock (in shares) | shares     82,287              
Over-Allotment Option                    
Stockholders Equity Note [Line Items]                    
Aggregate shares sold (in shares) | shares     1,017,390              
Option to purchase additional shares, period     30 days              
Minimum                    
Stockholders Equity Note [Line Items]                    
Special cash dividend rate           1.5     1.5  
Maximum                    
Stockholders Equity Note [Line Items]                    
Special cash dividend rate           2.0     2.0  
Series A Preferred Stock                    
Stockholders Equity Note [Line Items]                    
Preferred stock, shares authorized | shares           10,000,000     10,000,000  
Preferred stock, par value (in dollars per share)           $ 0.0001     $ 0.0001  
Preferred stock, shares issued | shares       700,000   700,000 700,000   700,000  
Preferred stock rate           7.50%        
Accrued dividend rate           2.00%        
Preferred stock, liquidation preference (in dollars per share)           $ 100 $ 100   $ 100  
Preferred Stock Voting Cap           4.99%        
Conversion cap, percentage           4.99%     4.99%  
Distributed to members (in shares) | shares         700,000          
Percentage of outstanding shares of common stock and voting power, affiliated holders         24.90%          
Percentage of outstanding shares of common stock and voting power, unaffiliated holders         9.90%          
Conversion price (in dollars per share)           $ 8.33        
Initial and current conversion price (in dollars per share)           $ 3.33        
Series A Preferred Stock | Minimum                    
Stockholders Equity Note [Line Items]                    
Preferred stock rate           5.00%        
Series A Preferred Stock | Maximum                    
Stockholders Equity Note [Line Items]                    
Preferred stock rate           14.50%