Investments, Security in Continuous Unrealized Loss Position (Details)	12 Months Ended
	Dec. 31, 2017 USD ($) Security	Dec. 31, 2016 USD ($) Security
U.S. Government and Government Agencies and Authorities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 0	$ 6,578,248
Less than 12 months, unrealized losses	0	(96,981)
12 months or longer, fair value	1,604,987	0
12 months or longer, unrealized losses	(73,530)	0
Total fair value	1,604,987	6,578,248
Total unrealized losses	(73,530)	(96,981)
U.S. Special Revenue and Assessments [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	0	974,250
Less than 12 months, unrealized losses	0	(14,043)
12 months or longer, fair value	0	0
12 months or longer, unrealized losses	0	0
Total fair value	0	974,250
Total unrealized losses	0	(14,043)
All Other Corporate Bonds [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	9,732,635	50,161,487
Less than 12 months, unrealized losses	(91,757)	(1,408,828)
12 months or longer, fair value	11,164,317	4,023,510
12 months or longer, unrealized losses	(206,406)	(148,351)
Total fair value	20,896,952	54,184,997
Total unrealized losses	(298,163)	(1,557,179)
Debt Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	9,732,635	57,713,985
Less than 12 months, unrealized losses	(91,757)	(1,519,852)
12 months or longer, fair value	12,769,304	4,023,510
12 months or longer, unrealized losses	(279,936)	(148,351)
Total fair value	22,501,939	61,737,495
Total unrealized losses	$ (371,693)	$ (1,668,203)
Less than 12 months, number of securities | Security	6	25
Twelve months or longer, number of securities | Security	6	3
Total number of securities | Security	12	28
Equity Securities [Member]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 4,130,260	$ 4,703,033
Less than 12 months, unrealized losses	(270,774)	(522,471)
12 months or longer, fair value	1,526,868	0
12 months or longer, unrealized losses	(241,569)	0
Total fair value	5,657,128	4,703,033
Total unrealized losses	$ (512,343)	$ (522,471)
Less than 12 months, number of securities | Security	2	3
Twelve months or longer, number of securities | Security	2	0
Total number of securities | Security	4	3