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Investments (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Summary of investments
Cost	$ 96,275,346	$ 105,597,085
Gross Unrealized Gains	4,798,006	5,046,350
Gross Unrealized Losses	(100,006)	(240,243)
Fair Market Value	100,973,346	110,403,192
Mutual funds [Member]
Summary of investments
Cost	70,053,356	78,571,294
Gross Unrealized Gains	244,865	435
Gross Unrealized Losses	(62,554)	(185,737)
Fair Market Value	70,235,667	78,385,992
US corporate debt securities [Member]
Summary of investments
Cost	26,221,990	26,923,855
Gross Unrealized Gains	15,380	0
Gross Unrealized Losses	(37,452)	(54,452)
Fair Market Value	26,199,918	26,869,403
Municipal bonds [Member]
Summary of investments
Cost		101,936
Gross Unrealized Gains		0
Gross Unrealized Losses		(54)
Fair Market Value		101,882
Investment in affiliated entity (PLS) [Member]
Summary of investments
Cost	0	0
Gross Unrealized Gains	4,537,761	5,045,915
Gross Unrealized Losses	0	0
Fair Market Value	$ 4,537,761	$ 5,045,915
Maximum [Member] | US corporate debt securities [Member]
Summary of investments
Contractual maturity, less than	2 years
Maximum [Member] | Municipal bonds [Member]
Summary of investments
Contractual maturity, less than	1 year

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