Fair Value (Estimated Fair Value of Financial Instruments) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Financial assets:
Securities available-for-sale, at fair value	$ 44,141,527	$ 43,129,481
Carrying amount
Financial assets:
Securities available-for-sale, at fair value	44,141,527	43,129,481
Approximate fair value
Financial assets:
Securities available-for-sale, at fair value	44,141,527	43,129,481
Level 1 | Carrying amount
Financial assets:
Cash and due from banks	2,538,248	3,310,400
Federal funds sold	914,000	2,672,000
Time deposits in other financial institutions	3,316,282	4,545,878
FHLB stock	710,000	703,400
Bankers’ Bank stock	147,500	147,500
Accrued interest receivable	418,494	439,855
Bank owned life insurance	3,185,043	3,138,112
Financial liabilities:
Accrued interest payable	29,436	13,982
Level 1 | Approximate fair value
Financial assets:
Cash and due from banks	2,538,248	3,310,400
Federal funds sold	914,000	2,672,000
Time deposits in other financial institutions	3,316,282	4,545,878
FHLB stock	710,000	703,400
Bankers’ Bank stock	147,500	147,500
Accrued interest receivable	418,494	439,855
Bank owned life insurance	3,185,043	3,138,112
Financial liabilities:
Accrued interest payable	29,436	13,982
Level 2 | Carrying amount
Financial assets:
Loans receivable, net	65,588,876	68,411,395
Financial liabilities:
Deposits	82,184,677	87,740,194
FHLB advances	14,000,000	14,000,000
Level 2 | Approximate fair value
Financial assets:
Loans receivable, net	66,104,876	69,008,986
Financial liabilities:
Deposits	74,264,677	87,828,194
FHLB advances	$ 14,054,000	$ 14,052,000