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Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized cost | $ 264,704,239 | $ 236,303,310
Estimated fair value | 272,213,552 | 259,287,603
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 33,066,449 | 34,365,382
Estimated fair value | 32,511,163 | 35,109,209
Redeemable Preferred Stock [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 269,214 | 269,214
Estimated fair value | 282,309 | $ 282,597
Due in 1 year [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 13,431,790 |
Estimated fair value | 13,486,895 |
Due in 2-5 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 97,740,824 |
Estimated fair value | 98,279,298 |
Due in 5-10 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 53,462,561 |
Estimated fair value | 55,425,119 |
Due in more than 10 years [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost | 66,833,402 |
Estimated fair value | $ 72,328,770 |

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