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Investments (Tables) | 12 Months Ended
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Sep. 30, 2020
Held To Maturity Securities Classified [Abstract] |
Summary of Short-term, Long-term Investments and Marketable Securities | The following tables summarize the Company’s short-term, long-term investments and marketable securities as of September 30, 2020 and September 30, 2019 by measurement category.
Held to Maturity |  | As of September 30, 2020 |  |  |  |  |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  |  |  |
Commercial notes (due within one year) |  | $ | 86,889,751 |  |  | $ | 1,589,873 |  |  | $ | - |  |  | $ | 88,479,624 |  |  |  |  |
Commercial notes (due within one through three years) |  | $ | 137,486,883 |  |  | $ | 4,573,964 |  |  | $ | (79,471 | ) |  | $ | 141,981,376 |  |  |  |  |
Total |  | $ | 224,376,634 |  |  | $ | 6,163,837 |  |  | $ | (79,471 | ) |  | $ | 230,461,000 |  |  |  |  |
|  | As of September 30, 2019 |  |  |  |  |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  |  |  |
Commercial notes (due within one year) |  | $ | 36,899,894 |  |  | $ | 222,584 |  |  | $ | - |  |  | $ | 37,122,478 |  |  |  |  |
Commercial notes (due within one through three years) |  | $ | 44,175,993 |  |  | $ | 875,258 |  |  | $ | - |  |  | $ | 45,051,251 |  |  |  |  |
Total |  | $ | 81,075,887 |  |  | $ | 1,097,842 |  |  | $ | - |  |  | $ | 82,173,729 |  |  |  |  |
Fair Value |  | As of September 30, 2020 |  |  |  |  |
|  | Amortized Cost |  |  | Realized Gains/(Losses) |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Marketable securities |  | $ | 85,000,000 |  |  | $ | 94,734 |  |  | $ | - |  |  | $ | (75,015 | ) |  | $ | 85,019,719 |
Total |  | $ | 85,000,000 |  |  | $ | 94,734 |  |  | $ | - |  |  | $ | (75,015 | ) |  | $ | 85,019,719 |

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