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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Debt securities, available for sale | $ 434,969,528 | $ 160,914,935
Investment in affiliated entities | 3,629,891 | 4,460,366
Mutual funds |  |
Assets: |  |
Debt securities, available for sale | 228,949,156 | 154,873,174
U.S. treasury securities |  |
Assets: |  |
Debt securities, available for sale | 200,414,000 |
Certificates of deposit |  |
Assets: |  |
Debt securities, available for sale | 2,992,200 | 3,016,260
U.S. agency mortgage-backed securities |  |
Assets: |  |
Debt securities, available for sale | 2,614,172 | 3,025,501
Fair Value, Measurements, Recurring |  |
Assets: |  |
Debt securities, available for sale | 434,969,528 | 160,914,935
Investment in affiliated entities | 3,629,891 | 4,460,366
Total assets measured at fair value | 438,599,419 | 225,372,101
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 429,363,156 | 154,873,174
Investment in affiliated entities | 3,629,891 | 4,460,366
Total assets measured at fair value | 432,993,047 | 219,330,340
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 2) |  |
Assets: |  |
Debt securities, available for sale | 5,606,372 | 6,041,761
Investment in affiliated entities | 0 | 0
Total assets measured at fair value | 5,606,372 | 6,041,761
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Debt securities, available for sale | 0 | 0
Investment in affiliated entities | 0 | 0
Total assets measured at fair value | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds |  |
Assets: |  |
Debt securities, available for sale | 228,949,156 | 154,873,174
Fair Value, Measurements, Recurring | Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Assets: |  |
Debt securities, available for sale | 228,949,156 | 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 | 200,414,000 |
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 | 200,414,000 |
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 | 2,992,200 | 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 | 2,992,200 | 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 | 2,614,172 | 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 | 2,614,172 | 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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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