Disclosure About Fair Value of Assets and Liabilities - Fair values of financial instruments not previously presented (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 21,872,003	$ 37,735,266	$ 15,005,941	$ 11,089,189
Interest-bearing time deposits	1,000,000	0
Loans held for sale	18,119,870	3,114,081
Loans, net of allowance for loan losses	169,844,971	179,332,026
Federal Home Loan Bank stock	2,801,800	2,657,400
Interest receivable	552,531	624,333
Federal Home Loan Bank lender risk account receivable	1,767,171	1,713,240
Deposits	147,547,374	143,410,707
Federal Home Loan Bank advances	40,512,000	47,172,066
Stock subscription proceeds in escrow	0	23,407,011
Advances from borrowers for taxes and insurance	1,300,427	1,806,638
Interest payable	75,531	91,636
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	21,872,003	37,735,266
Stock subscription proceeds in escrow		23,407,011
Level 1 | Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits	80,400,012	66,172,775
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest-bearing time deposits	1,000,000
Loans held for sale	18,577,604	3,178,068
Federal Home Loan Bank stock	2,801,800	2,657,400
Level 2 | Accrued Interest Receivables [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest receivable	552,531	624,333
Level 2 | Tax [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Advances from borrowers for taxes and insurance	1,300,427	1,806,638
Level 2 | Interest Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest payable	75,531	91,636
Level 2 | Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits	68,795,698	78,065,313
Level 2 | Federal Home Loan Bank Advances [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank advances	42,032,042	47,707,920
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, net of allowance for loan losses	168,401,288	175,117,724
Level 3 | Federal Home Loan Bank [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Home Loan Bank lender risk account receivable	$ 2,147,762	$ 1,820,707