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Investments - Summary of Available-for-sale Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Summary of investments
Cost	$ 103,986,286	$ 85,981,187
Gross Unrealized Gains	2,370,208	3,878,737
Gross Unrealized Losses	(392,571)	(453,002)
Fair Market Value	105,963,923	89,406,922
Mutual funds
Summary of investments
Cost	68,776,165	60,883,065
Gross Unrealized Gains	42,097	94,374
Gross Unrealized Losses	(252,373)	(387,693)
Fair Market Value	68,565,889	60,589,746
US corporate debt securities
Summary of investments
Cost	35,210,121	25,098,122
Gross Unrealized Gains	3,032	6,853
Gross Unrealized Losses	(140,198)	(65,309)
Fair Market Value	35,072,955	25,039,666
Investment in affiliated entity (PLS)
Summary of investments
Cost	0	0
Gross Unrealized Gains	2,325,079	3,777,510
Gross Unrealized Losses	0	0
Fair Market Value	$ 2,325,079	$ 3,777,510
Maximum | US corporate debt securities
Summary of investments
Contractual maturity	2 years	2 years

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