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Investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Summary of investments
Cost	$ 66,907,490	$ 85,981,187
Gross Unrealized Gains	3,156,004	3,878,737
Gross Unrealized Losses	(280,744)	(453,002)
Fair Market Value	69,782,750	89,406,922
Mutual funds [Member]
Summary of investments
Cost	41,735,855	60,883,065
Gross Unrealized Gains	120,960	94,374
Gross Unrealized Losses	(222,538)	(387,693)
Fair Market Value	41,634,277	60,589,746
US corporate debt securities [Member]
Summary of investments
Cost	25,171,635	25,098,122
Gross Unrealized Gains	7,495	6,853
Gross Unrealized Losses	(58,206)	(65,309)
Fair Market Value	25,120,924	25,039,666
Investment in affiliated entity (PLS) [Member]
Summary of investments
Cost	0	0
Gross Unrealized Gains	3,027,549	3,777,510
Gross Unrealized Losses	0	0
Fair Market Value	$ 3,027,549	$ 3,777,510
Maximum [Member] | US corporate debt securities [Member]
Summary of investments
Contractual maturity, less than	2 years

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