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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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