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Investments - Investment Income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Realized gains (losses) | $ 1,535,575 | $ (925,889) | $ 4,059,080 | $ (1,743,428)
Unrealized gains (losses) | 3,756,121 | 11,948,270 | 6,261,465 | (10,519,328)
Dividends | 604,921 | 570,538 | 1,269,930 | 1,464,951
Other | (19,531) | (30,295) | (49,935) | (37,663)
Investment income (loss), net | $ 5,877,086 | $ 11,562,624 | $ 11,540,540 | $ (10,835,468)

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