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Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized cost | $ 236,303,310 | $ 265,150,484
Estimated fair value | 259,287,603 | 294,656,679
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 34,365,382 | 31,047,791
Estimated fair value | 35,109,209 | 32,346,062
Redeemable Preferred Stock [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 269,214 | 269,214
Estimated fair value | 282,597 | $ 272,605
Due in 1 year [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 68,966 |
Estimated fair value | 70,024 |
Due in 2-5 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 62,958,696 |
Estimated fair value | 65,605,915 |
Due in 5-10 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 70,740,783 |
Estimated fair value | 77,346,448 |
Due in more than 10 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 67,900,269 |
Estimated fair value | $ 80,873,410 |

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