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Investments - Schedule of Derivative Investments (Details) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2022 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amounts |  | $ 571,000 | $ 571,000
Realized gain(loss) | $ (2,095,000) | (2,095,000) |
Unrealized gain(loss) | $ 2,442,000 | 2,412,000 |
Call Option |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amounts |  | 8,000 | 8,000
Unrealized gain(loss) |  | (10,000) |
Put Option |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amounts |  | 563,000 | $ 563,000
Securities Swap and Option Agreement |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized gain(loss) |  | (2,095,000) |
Unrealized gain(loss) |  | $ 2,422,000 |

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