Investment Securities (Details 2)	Sep. 30, 2018 USD ($) Number	Dec. 31, 2017 USD ($) Number
Less than 12 Months
Number of positions | Number	35	40
Fair Value	$ 83,759,057	$ 96,650,130
Gross Unrealized Loss	$ (2,650,550)	$ (1,008,317)
12 months or Longer
Number of positions | Number	23	32
Fair value	$ 22,182,860	$ 21,337,625
Gross Unrealized Losses	$ (1,189,270)	$ (835,785)
Total
Number of positions | Number	58	72
Fair value	$ 105,941,917	$ 117,987,755
Gross Unrealized Loss	$ (3,839,820)	$ (1,844,102)
U.S. Treasury Notes [Member]
Less than 12 Months
Number of positions | Number	7	8
Fair Value	$ 31,839,733	$ 35,559,845
Gross Unrealized Loss	$ (1,128,095)	$ (411,145)
Total
Number of positions | Number	7	8
Fair value	$ 31,839,733	$ 35,559,845
Gross Unrealized Loss	$ (1,128,095)	$ (411,145)
Government-Sponsored Enterprises [Member]
Less than 12 Months
Number of positions | Number	9	12
Fair Value	$ 43,775,540	$ 53,275,064
Gross Unrealized Loss	$ (1,322,126)	$ (462,174)
12 months or Longer
Number of positions | Number	4	3
Fair value	$ 14,795,110	$ 10,281,440
Gross Unrealized Losses	$ (834,235)	$ (425,637)
Total
Number of positions | Number	13	15
Fair value	$ 58,570,650	$ 63,556,504
Gross Unrealized Loss	$ (2,156,361)	$ (887,811)
Municipal Securities [Member]
Less than 12 Months
Number of positions | Number	19	20
Fair Value	$ 8,143,784	$ 7,815,221
Gross Unrealized Loss	$ (200,329)	$ (134,998)
12 months or Longer
Number of positions | Number	19	29
Fair value	$ 7,387,750	$ 11,056,185
Gross Unrealized Losses	$ (355,035)	$ (410,148)
Total
Number of positions | Number	38	49
Fair value	$ 15,531,534	$ 18,871,406
Gross Unrealized Loss	$ (555,364)	$ (545,146)