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Investments (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Summary of investments |  |
Cost | $ 96,275,346 | $ 105,597,085
Gross Unrealized Gains | 4,798,006 | 5,046,350
Gross Unrealized Losses | (100,006) | (240,243)
Fair Market Value | 100,973,346 | 110,403,192
Mutual funds [Member] |  |
Summary of investments |  |
Cost | 70,053,356 | 78,571,294
Gross Unrealized Gains | 244,865 | 435
Gross Unrealized Losses | (62,554) | (185,737)
Fair Market Value | 70,235,667 | 78,385,992
US corporate debt securities [Member] |  |
Summary of investments |  |
Cost | 26,221,990 | 26,923,855
Gross Unrealized Gains | 15,380 | 0
Gross Unrealized Losses | (37,452) | (54,452)
Fair Market Value | 26,199,918 | 26,869,403
Municipal bonds [Member] |  |
Summary of investments |  |
Cost |  | 101,936
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (54)
Fair Market Value |  | 101,882
Investment in affiliated entity (PLS) [Member] |  |
Summary of investments |  |
Cost | 0 | 0
Gross Unrealized Gains | 4,537,761 | 5,045,915
Gross Unrealized Losses | 0 | 0
Fair Market Value | $ 4,537,761 | $ 5,045,915
Maximum [Member] | US corporate debt securities [Member] |  |
Summary of investments |  |
Contractual maturity, less than | 2 years |
Maximum [Member] | Municipal bonds [Member] |  |
Summary of investments |  |
Contractual maturity, less than | 1 year |

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