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Investments (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Summary of investments
Cost	$ 105,780,349	$ 105,597,085
Gross Unrealized Gains	5,650,349	5,046,350
Gross Unrealized Losses	(38,221)	(240,243)
Fair Market Value	111,392,477	110,403,192
Mutual funds [Member]
Summary of investments
Cost	78,205,874	78,571,294
Gross Unrealized Gains	309,613	435
Gross Unrealized Losses	(16,791)	(185,737)
Fair Market Value	78,498,696	78,385,992
US corporate debt securities [Member]
Summary of investments
Cost	27,574,475	26,923,855
Gross Unrealized Gains	31,248	0
Gross Unrealized Losses	(21,430)	(54,452)
Fair Market Value	27,584,293	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	5,309,488	5,045,915
Gross Unrealized Losses	0	0
Fair Market Value	$ 5,309,488	$ 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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