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Investments - Summary of Available-for-sale Securities (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Summary of investments
Cost	$ 118,678,273	$ 85,981,187
Gross Unrealized Gains	2,931,135	3,878,737
Gross Unrealized Losses	(277,762)	(453,002)
Fair Market Value	121,331,646	89,406,922
Mutual funds [Member]
Summary of investments
Cost	73,416,881	60,883,065
Gross Unrealized Gains	203,203	94,374
Gross Unrealized Losses	(198,767)	(387,693)
Fair Market Value	73,421,317	60,589,746
US corporate debt securities [Member]
Summary of investments
Cost	45,261,392	25,098,122
Gross Unrealized Gains	7,887	6,853
Gross Unrealized Losses	(78,995)	(65,309)
Fair Market Value	45,190,284	25,039,666
Investment in affiliated entity (PLS) [Member]
Summary of investments
Cost	0	0
Gross Unrealized Gains	2,720,045	3,777,510
Gross Unrealized Losses	0	0
Fair Market Value	$ 2,720,045	$ 3,777,510
Maximum [Member] | US corporate debt securities [Member]
Summary of investments
Contractual maturity, less than	2 years	2 years

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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