Securities Available-for-Sale (Amortized Cost and Fair Value of Securities by Maturity) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Amortized cost
Due in one year or less	$ 0
Due after one year through five years	1,085,760
Due after five years, but less than ten years	7,198,710
Due after ten years	7,571,731
With single maturity date total	15,856,201
Amortized cost	45,526,060	$ 43,622,065
Fair value
Due in one year or less	0
Due after one year through five years	1,086,183
Due after five years, but less than ten years	7,072,507
Due after ten years	7,328,970
With single maturity date total	15,487,660
Fair value	44,141,527	43,129,481
Mortgage-backed securities
Amortized cost
Without single maturity date	29,669,859
Amortized cost	29,669,859	27,331,766
Fair value
Without single maturity date	28,653,867
Fair value	$ 28,653,867	$ 26,784,589