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Investments (Tables) | 6 Months Ended
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Mar. 31, 2020
Held To Maturity Securities Classified [Abstract] |
Summary of Short-term and Long-term Investments | The following tables summarize the Company’s short-term and long-term investments as of March 31, 2020, and September 30, 2019.
|  | As of March 31, 2020 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Commercial notes (due within one year) |  | $ | 50,959,058 |  |  | $ | 264,194 |  |  | $ | (37,786) |  |  | $ | 51,185,466 |
Commercial notes (due within one through three years) |  | $ | 190,618,075 |  |  | $ | 1,735,812 |  |  | $ | (1,481,115) |  |  | $ | 190,872,772 |
Total |  | $ | 241,577,133 |  |  | $ | 2,000,006 |  |  | $ | (1,518,901) |  |  | $ | 242,058,238‬ |
|  | 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 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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