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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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- Definition

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
-SubTopic 10
-Section 50
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