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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Debt securities, available for sale | $ 384,752,382 | $ 160,914,935
Mutual funds |  |
Assets: |  |
Debt securities, available for sale | 208,459,732 | 154,873,174
U.S. treasury securities |  |
Assets: |  |
Debt securities, available for sale | 170,210,129 |
Certificates of deposit |  |
Assets: |  |
Debt securities, available for sale | 2,998,500 | 3,016,260
U.S. agency mortgage-backed securities |  |
Assets: |  |
Debt securities, available for sale | 3,084,021 | 3,025,501
Fair Value, Measurements, Recurring |  |
Assets: |  |
Debt securities, available for sale | 384,752,382 | 160,914,935
Investment in affiliated entity | 3,908,709 | 4,460,366
Total assets measured at fair value | 388,661,091 | 225,372,101
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 378,669,861 | 154,873,174
Investment in affiliated entity | 3,908,709 | 4,460,366
Total assets measured at fair value | 382,578,570 | 219,330,340
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 6,082,521 | 6,041,761
Investment in affiliated entity | 0 | 0
Total assets measured at fair value | 6,082,521 | 6,041,761
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Investment in affiliated entity | 0 | 0
Total assets measured at fair value | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds |  |
Assets: |  |
Debt securities, available for sale | 208,459,732 | 154,873,174
Fair Value, Measurements, Recurring | Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 208,459,732 | 154,873,174
Fair Value, Measurements, Recurring | Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. treasury securities |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 59,996,800
Debt securities, available for sale | 170,210,129 |
Fair Value, Measurements, Recurring | U.S. treasury securities | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 59,996,800
Debt securities, available for sale | 170,210,129 |
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 0
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents, fair value |  | 0
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Assets: |  |
Debt securities, available for sale | 2,998,500 | 3,016,260
Fair Value, Measurements, Recurring | Certificates of deposit | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 0 |
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 2,998,500 | 3,016,260
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities |  |
Assets: |  |
Debt securities, available for sale | 3,084,021 | 3,025,501
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 3,084,021 | 3,025,501
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | $ 0 | $ 0

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