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Investments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Summary of investments
Cost	$ 85,730,710	$ 53,327,364
Gross Unrealized Gains	7,136,820	2,737
Gross Unrealized Losses	(423,206)	(254,127)
Fair Market Value	92,444,324	53,075,974
Mutual funds [Member]
Summary of investments
Cost	58,633,654	29,487,758
Gross Unrealized Gains	0	2,667
Gross Unrealized Losses	(398,320)	(216,790)
Fair Market Value	58,235,334	29,273,635
US corporate debt securities [Member]
Summary of investments
Cost	26,993,900	23,839,606
Gross Unrealized Gains	6,052	70
Gross Unrealized Losses	(24,873)	(37,337)
Fair Market Value	26,975,079	$ 23,802,339
Municipal bonds [Member]
Summary of investments
Cost	103,156
Gross Unrealized Gains	0
Gross Unrealized Losses	(13)
Fair Market Value	103,143
Investment in affiliated entity (PLS) [Member]
Summary of investments
Cost	0
Gross Unrealized Gains	7,130,768
Gross Unrealized Losses	0
Fair Market Value	$ 7,130,768
Maximum [Member] | US corporate debt securities [Member]
Summary of investments
Contractual maturity, less than	2 years	2 years
Maximum [Member] | Municipal bonds [Member]
Summary of investments
Contractual maturity, less than	1 year

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