Investment Securities (Details 1) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 13,072,183	$ 11,554,040
Due in one year to five years	75,402,886	72,622,056
Due in five years to ten years	38,882,831	53,290,088
Due in ten years and over	1,255,470	3,140,623
Total	128,613,370	140,606,807
Estimated Fair Value
Due in one year or less	13,077,578	11,546,968
Due in one year to five years	73,941,666	72,124,395
Due in five years to ten years	37,675,784	52,576,036
Due in ten years and over	1,219,866	3,002,851
Total	$ 125,914,894	$ 139,250,250