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Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary of investments
Cost	$ 85,981,187	$ 105,597,085
Gross Unrealized Gains	3,878,737	5,046,350
Gross Unrealized Losses	(453,002)	(240,243)
Fair Market Value	89,406,922	110,403,192
Mutual funds
Summary of investments
Cost	60,883,065	78,571,294
Gross Unrealized Gains	94,374	435
Gross Unrealized Losses	(387,693)	(185,737)
Fair Market Value	60,589,746	78,385,992
US corporate debt securities
Summary of investments
Cost	25,098,122	26,923,855
Gross Unrealized Gains	6,853	0
Gross Unrealized Losses	(65,309)	(54,452)
Fair Market Value	25,039,666	26,869,403
Municipal bonds
Summary of investments
Cost		101,936
Gross Unrealized Gains		0
Gross Unrealized Losses		(54)
Fair Market Value		101,882
Investment in affiliated entity (PLS)
Summary of investments
Cost	0	0
Gross Unrealized Gains	3,777,510	5,045,915
Gross Unrealized Losses	0	0
Fair Market Value	$ 3,777,510	$ 5,045,915
Maximum | US corporate debt securities
Summary of investments
Contractual Maturity (less than 1 year)	2 years	2 years
Maximum | Municipal bonds
Summary of investments
Contractual Maturity (less than 1 year)	1 year	1 year

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