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Investments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Summary of investments
Cost	$ 105,183,509	$ 105,597,085
Gross Unrealized Gains	5,151,750	5,046,350
Gross Unrealized Losses	(144,960)	(240,243)
Fair Market Value	110,190,299	110,403,192
Mutual funds [Member]
Summary of investments
Cost	78,572,862	78,571,294
Gross Unrealized Gains	113,561	435
Gross Unrealized Losses	(117,133)	(185,737)
Fair Market Value	78,569,290	78,385,992
US corporate debt securities [Member]
Summary of investments
Cost	26,509,854	26,923,855
Gross Unrealized Gains	11,272	0
Gross Unrealized Losses	(27,766)	(54,452)
Fair Market Value	26,493,360	26,869,403
Municipal bonds [Member]
Summary of investments
Cost	100,793	101,936
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(61)	(54)
Fair Market Value	100,732	101,882
Investment in affiliated entity (PLS) [Member]
Summary of investments
Cost	0	0
Gross Unrealized Gains	5,026,917	5,045,915
Gross Unrealized Losses	0	0
Fair Market Value	$ 5,026,917	$ 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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