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Investments (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Summary of investments
Cost	$ 68,204,046	$ 85,981,187
Gross Unrealized Gains	3,540,820	3,878,737
Gross Unrealized Losses	(266,445)	(453,002)
Fair Market Value	71,478,421	89,406,922
Mutual funds [Member]
Summary of investments
Cost	43,085,855	60,883,065
Gross Unrealized Gains	194,051	94,374
Gross Unrealized Losses	(212,400)	(387,693)
Fair Market Value	43,067,506	60,589,746
US corporate debt securities [Member]
Summary of investments
Cost	25,118,191	25,098,122
Gross Unrealized Gains	6,967	6,853
Gross Unrealized Losses	(54,045)	(65,309)
Fair Market Value	25,071,113	25,039,666
Investment in affiliated entity (PLS) [Member]
Summary of investments
Cost	0	0
Gross Unrealized Gains	3,339,802	3,777,510
Gross Unrealized Losses	0	0
Fair Market Value	$ 3,339,802	$ 3,777,510
Maximum [Member] | US corporate debt securities [Member]
Summary of investments
Contractual maturity, less than	2 years

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