Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Details)

v3.21.4
Stockholders' Equity - Additional Information (Details)
 12 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Jan. 07, 2014
shares
Class Of Stock [Line Items]      
Accrued dividends | $ $ 720,000 $ 1,000  
Common stock, shares issued 1,582,334 1,589,101  
Common stock, shares outstanding 1,582,334 1,589,101  
Treasury stock purchased, shares 35,435 236,908  
Payment for treasury stock | $ $ 421,000 $ 1,660,000  
2014 Omnibus Equity Incentive Plan      
Class Of Stock [Line Items]      
Common stock reserved for issuance     300,000
Series B Preferred Stock      
Class Of Stock [Line Items]      
Preferred stock, issued 315,790 214,244  
Preferred stock, outstanding 315,790 214,244  
Dividends declared per share by board of directors | $ / shares $ 1.00    
Stockholders' equity, conversion ratio 5    
Series E Convertible Preferred Stock      
Class Of Stock [Line Items]      
Preferred stock, issued 47,840 47,840  
Preferred stock, outstanding 47,840 47,840  
Repurchased shares of preferred stock   30,000  
Aggregate purchase price of convertible preferred stock | $   $ 3,000  
Preferred stock, dividend rate 5.00%    
Preferred stock, liquidation preference per share | $ / shares $ 0.30 $ 0.30  
Preferred stock conversion ratio 0.005    
Preferred stock, conversion price per share | $ / shares $ 85.50    
Accrued dividends | $ $ 200,000 $ 1,000