Investment Securities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost	$ 123,007,441	$ 140,606,807
Gross Unrealized Gains	179,950	487,545
Gross Unrealized Losses	(3,356,066)	(1,844,102)
Estimated Fair Value	119,831,325	139,250,250
U.S. Treasury Notes [Member]
Amortized Cost	32,969,932	35,970,990
Gross Unrealized Losses	(939,735)	(411,145)
Estimated Fair Value	32,030,197	35,559,845
Government-Sponsored Enterprises [Member]
Amortized Cost	60,768,977	64,444,315
Gross Unrealized Losses	(1,847,892)	(887,811)
Estimated Fair Value	58,921,085	63,556,504
Municipal Securities [Member]
Amortized Cost	29,268,532	40,191,502
Gross Unrealized Gains	179,950	487,545
Gross Unrealized Losses	(568,439)	(545,146)
Estimated Fair Value	$ 28,880,043	$ 40,133,901