Carrying Amounts and Fair Value of Financial Instruments (Summary of the carrying value and estimated fair value of financial instruments) (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Financial Assets:
Cash And Cash Equivalents	$ 15,462,000	$ 12,536,000
Cash and Cash Equivalents	15,462,336	12,536,311	$ 19,120,091	$ 12,705,910
Certificates of Deposits With Other Banks	950,000	950,000
Investments	487,610,779	433,891,775
Certificates of Deposit with Other Banks	950,005	950,005
Investment And Mortgage-Backed Securities	488,520,000	434,451,000
Financing Receivable, after Allowance for Credit Loss	459,966,510	452,858,735
Loans Receivable, Net	465,391,000	450,796,000
FHLB Stock	4,086,000	2,537,000
Federal Home Loan Bank (FHLB) Stock, at Cost	4,086,200	2,536,500
Financial Liabilities:
Checking, Savings, And Money Market Accounts	552,879,000	541,954,000
Certificate Accounts, Carrying Value	223,121,000	229,453,000
Certificate Accounts	224,691,000	229,363,000
Advances From FHLB	75,769,000	38,138,000
Advances From FHLB	76,269,000	38,233,000
Other Borrowed Money	17,006,000	11,580,000
Notes Payable	0	0
Other Borrowings	17,006,411	11,579,819
Notes Payable, Fair Value Disclosure	0
Senior Convertible Debentures	0	6,044,000
Junior Subordinated Debentures	5,155,000	5,155,000
Fair Value, Inputs, Level 1
Financial Assets:
Cash And Cash Equivalents		12,536,000
Cash and Cash Equivalents	15,462,000
Certificates of Deposits With Other Banks	0	0
Investment And Mortgage-Backed Securities	0	0
Loans Receivable, Net	0	0
FHLB Stock		2,537,000
Federal Home Loan Bank (FHLB) Stock, at Cost	4,086,000
Financial Liabilities:
Checking, Savings, And Money Market Accounts	552,879,000	541,954,000
Certificate Accounts	0	0
Advances From FHLB	0	0
Other Borrowed Money		11,580,000
Other Borrowings	17,006,000
Senior Convertible Debentures	0	0
Junior Subordinated Debentures	0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Cash And Cash Equivalents	0	0
Certificates of Deposits With Other Banks		950,000
Certificates of Deposit with Other Banks	950,000
Investment And Mortgage-Backed Securities	488,520,000	434,451,000
Loans Receivable, Net	0	0
FHLB Stock	0	0
Financial Liabilities:
Checking, Savings, And Money Market Accounts	0	0
Certificate Accounts	224,691,000	229,363,000
Advances From FHLB	76,269,000	38,233,000
Other Borrowed Money	0	0
Notes Payable, Fair Value Disclosure	0
Senior Convertible Debentures	0	6,044,000
Junior Subordinated Debentures	5,155,000	5,155,000
Fair Value, Inputs, Level 3
Financial Assets:
Cash And Cash Equivalents	0	0
Certificates of Deposits With Other Banks	0	0
Investment And Mortgage-Backed Securities	0	0
Loans Receivable, Net	465,391,000	450,796,000
FHLB Stock	0	0
Financial Liabilities:
Checking, Savings, And Money Market Accounts	0	0
Certificate Accounts	0	0
Advances From FHLB	0	0
Other Borrowed Money	0	0
Senior Convertible Debentures	0	0
Junior Subordinated Debentures	$ 0	$ 0