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Schedule of Investments Classified by Contractual Maturity Date (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Amortized cost	$ 276,404,869	$ 236,303,310
Estimated fair value	270,676,282	259,287,603
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Marketable Securities [Line Items]
Amortized cost	31,598,530	34,365,382
Estimated fair value	30,017,766	35,109,209
Redeemable Preferred Stock [Member]
Marketable Securities [Line Items]
Amortized cost	261,142	269,214
Estimated fair value	272,181	$ 282,597
Due in 1 year [Member]
Marketable Securities [Line Items]
Amortized cost	12,212,759
Estimated fair value	12,193,769
Due in 2-5 years [Member]
Marketable Securities [Line Items]
Amortized cost	96,106,175
Estimated fair value	94,530,894
Due in 5-10 years [Member]
Marketable Securities [Line Items]
Amortized cost	59,527,119
Estimated fair value	58,074,435
Due in more than 10 years [Member]
Marketable Securities [Line Items]
Amortized cost	76,699,144
Estimated fair value	$ 75,587,237

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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
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