The amortized cost and estimated fair value of investment securities available for sale as of June 30, 2021 and December 31, 2020, by contractual maturity are in the following table. (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Due in one year or less, amortized cost	$ 31,478,979	$ 32,245,646
Due in one year or less, estimated fair value	31,681,691	32,622,890
Due in one year to five years, amortized cost	58,705,571	40,022,194
Due in one year to five years, estimated fair value	59,391,674	41,258,370
Due in five years to ten years, amortized cost	68,742,245	50,438,223
Due in five years to ten years, estimated fair value	67,855,339	50,968,288
Due in ten years and over, amortized cost	4,189,193	10,000,000
Due in ten years and over, estimated fair value	4,111,467	9,970,270
Total, amortized cost	163,115,988	132,706,063
Total, estimated fair value	$ 163,040,171	$ 134,819,818