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Investments - Summary of Available-for-sale Securities (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2015
Debt Securities, Available-for-sale [Abstract]
Cost	$ 81,107,750
Gross Unrealized Losses	(598,386)
Gross Unrealized Gains	2,667,805	$ 2,325,079
Fair Market Value	83,177,169
Cost		0	$ 0
Gross Unrealized Gains		2,325,079
Gross Unrealized Losses		0
Fair Market Value		2,325,079
Cost		103,986,286
Gross Unrealized Gains		2,370,208
Gross Unrealized Losses		(392,571)
Fair Market Value		105,963,923
Mutual funds
Debt Securities, Available-for-sale [Abstract]
Cost	69,855,486	68,776,165
Gross Unrealized Gains	0	42,097
Gross Unrealized Losses	(532,970)	(252,373)
Fair Market Value	69,322,516	68,565,889
US corporate debt securities
Debt Securities, Available-for-sale [Abstract]
Cost	11,252,264	35,210,121
Gross Unrealized Gains	0	3,032
Gross Unrealized Losses	(65,416)	(140,198)
Fair Market Value	$ 11,186,848	$ 35,072,955
Maximum | US corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Contractual maturity, less than	2 years	2 years

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Debt Securities, Available-for-sale contractual maturity.

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