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Investments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Summary of investments |  |
Cost | $ 66,907,490 | $ 85,981,187
Gross Unrealized Gains | 3,156,004 | 3,878,737
Gross Unrealized Losses | (280,744) | (453,002)
Fair Market Value | 69,782,750 | 89,406,922
Mutual funds [Member] |  |
Summary of investments |  |
Cost | 41,735,855 | 60,883,065
Gross Unrealized Gains | 120,960 | 94,374
Gross Unrealized Losses | (222,538) | (387,693)
Fair Market Value | 41,634,277 | 60,589,746
US corporate debt securities [Member] |  |
Summary of investments |  |
Cost | 25,171,635 | 25,098,122
Gross Unrealized Gains | 7,495 | 6,853
Gross Unrealized Losses | (58,206) | (65,309)
Fair Market Value | 25,120,924 | 25,039,666
Investment in affiliated entity (PLS) [Member] |  |
Summary of investments |  |
Cost | 0 | 0
Gross Unrealized Gains | 3,027,549 | 3,777,510
Gross Unrealized Losses | 0 | 0
Fair Market Value | $ 3,027,549 | $ 3,777,510
Maximum [Member] | US corporate debt securities [Member] |  |
Summary of investments |  |
Contractual maturity, less than | 2 years |

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