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Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized cost | $ 340,262,502 | $ 236,303,310
Estimated fair value | 320,806,385 | 259,287,603
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 32,865,784 | 34,365,382
Estimated fair value | 29,314,922 | 35,109,209
Redeemable Preferred Stock [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 250,000 | 269,214
Estimated fair value | 260,000 | $ 282,597
Due in 1 year [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 11,546,042 |
Estimated fair value | 11,537,459 |
Due in 2-5 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 137,667,392 |
Estimated fair value | 132,904,405 |
Due in 5-10 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 67,911,889 |
Estimated fair value | 63,435,713 |
Due in more than 10 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 90,021,395 |
Estimated fair value | $ 83,353,886 |

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