| Computation of Basic and Diluted Net Earnings Per Share | The following table presents the computation of basic and diluted net earnings per share:   
|   |   | Three Months Ended March 31, |   |   | Six Months Ended March 31, |   |  
|   |   | 2021 |   |   | 2020 |   |   | 2021 |   |   | 2020 |   |  
| Basic |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Net income |   | $ | 8,734 |   |   | $ | 1,881 |   |   | $ | 14,147 |   |   | $ | 2,866 |   |  
| Less: preferred stock dividends |   |   | — |   |   |   | — |   |   |   | — |   |   |   | — |   |  
| Net income applicable to common stock |   | $ | 8,734 |   |   | $ | 1,881 |   |   | $ | 14,147 |   |   | $ | 2,866 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Weighted average common shares outstanding |   |   | 1,555,175 |   |   |   | 1,752,908 |   |   |   | 1,534,287 |   |   |   | 1,779,706 |   |  
| Basic earnings per share |   | $ | 5.62 |   |   | $ | 1.07 |   |   | $ | 9.22 |   |   | $ | 1.61 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Diluted |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Net income applicable to common stock |   | $ | 8,734 |   |   | $ | 1,881 |   |   | $ | 14,147 |   |   | $ | 2,866 |   |  
| Add: preferred stock dividends |   |   | — |   |   |   | — |   |   |   | — |   |   |   | — |   |  
| Net income applicable for diluted earnings per share |   | $ | 8,734 |   |   | $ | 1,881 |   |   | $ | 14,147 |   |   | $ | 2,866 |   |  
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |  
| Weighted average common shares outstanding |   |   | 1,555,175 |   |   |   | 1,752,908 |   |   |   | 1,534,287 |   |   |   | 1,779,706 |   |  
| Add: Options |   |   | 87,168 |   |   |   | — |   |   |   | 87,168 |   |   |   | — |   |  
| Add: Series B Preferred Stock |   |   | 1,593,950 |   |   |   | 1,071,220 |   |   |   | 1,593,950 |   |   |   | 1,071,220 |   |  
| Add: Series B Preferred Stock Warrants |   |   | — |   |   |   | 590,147 |   |   |   | — |   |   |   | 590,147 |   |  
| Add: Series E Preferred Stock |   |   | 47,840 |   |   |   | 47,840 |   |   |   | 47,840 |   |   |   | 47,840 |   |  
| Assumed weighted average common shares outstanding |   |   | 3,284,133 |   |   |   | 3,462,115 |   |   |   | 3,263,245 |   |   |   | 3,488,913 |   |  
| Diluted earnings per share |   | $ | 2.66 |   |   | $ | 0.54 |   |   | $ | 4.34 |   |   | $ | 0.82 |   |    |