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

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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