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Short-term Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Jun. 30, 2023 | Dec. 31, 2022
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Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | $ 142,212,907 | $ 206,669,397
Mutual funds |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 60,108,322 | 107,662,718
Certificates of deposit |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 2,990,620 | 2,990,908
U.S. agency mortgage-backed securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 968,975 | 1,051,261
Fair Value, Measurements, Recurring |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 142,212,907 | 206,669,397
Investment in affiliated entity | 2,780,526 | 2,007,142
Total assets measured at fair value | 144,993,433 | 208,676,539
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 138,253,312 | 202,627,228
Investment in affiliated entity | 2,780,526 | 2,007,142
Total assets measured at fair value | 141,033,838 | 204,634,370
Fair Value, Measurements, Recurring | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 3,959,595 | 4,042,169
Investment in affiliated entity | 0 | 0
Total assets measured at fair value | 3,959,595 | 4,042,169
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
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 |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 60,108,322 | 107,662,718
Fair Value, Measurements, Recurring | Mutual funds | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 60,108,322 | 107,662,718
Fair Value, Measurements, Recurring | Mutual funds | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Mutual funds | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. treasury securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 78,144,990 | 94,964,510
Fair Value, Measurements, Recurring | U.S. treasury securities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 78,144,990 | 94,964,510
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. treasury securities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Certificates of deposit |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 2,990,620 | 2,990,908
Fair Value, Measurements, Recurring | Certificates of deposit | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 2,990,620 | 2,990,908
Fair Value, Measurements, Recurring | Certificates of deposit | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 968,975 | 1,051,261
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Quoted Prices in Active Markets (Level 1) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 0 | 0
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Other Unobservable Inputs (Level 2) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | 968,975 | 1,051,261
Fair Value, Measurements, Recurring | U.S. agency mortgage-backed securities | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities that are measured at fair value on recurring basis |  |
Debt securities, available for sale | $ 0 | $ 0

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