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Significant Accounting Policies - Mutual Fund Administration Revenue (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue from External Customer [Line Items] |  |  |
Total revenue | $ 136,716,371 | $ 154,496,019 | $ 182,193,837
Administration revenue, gross |  |  |
Revenue from External Customer [Line Items] |  |  |
Total revenue | 21,597,721 | 25,188,386 | 29,635,451
Fund related expense |  |  |
Revenue from External Customer [Line Items] |  |  |
Expenses | (14,060,850) | (15,017,884) | (17,579,223)
Mutual fund administration revenue, net |  |  |
Revenue from External Customer [Line Items] |  |  |
Total revenue | $ 7,536,871 | $ 10,170,502 | $ 12,056,228

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