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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 |

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