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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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