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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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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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