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Investments (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Summary of investments |  |
Cost | $ 105,183,509 | $ 105,597,085
Gross Unrealized Gains | 5,151,750 | 5,046,350
Gross Unrealized Losses | (144,960) | (240,243)
Fair Market Value | 110,190,299 | 110,403,192
Mutual funds [Member] |  |
Summary of investments |  |
Cost | 78,572,862 | 78,571,294
Gross Unrealized Gains | 113,561 | 435
Gross Unrealized Losses | (117,133) | (185,737)
Fair Market Value | 78,569,290 | 78,385,992
US corporate debt securities [Member] |  |
Summary of investments |  |
Cost | 26,509,854 | 26,923,855
Gross Unrealized Gains | 11,272 | 0
Gross Unrealized Losses | (27,766) | (54,452)
Fair Market Value | 26,493,360 | 26,869,403
Municipal bonds [Member] |  |
Summary of investments |  |
Cost | 100,793 | 101,936
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (61) | (54)
Fair Market Value | 100,732 | 101,882
Investment in affiliated entity (PLS) [Member] |  |
Summary of investments |  |
Cost | 0 | 0
Gross Unrealized Gains | 5,026,917 | 5,045,915
Gross Unrealized Losses | 0 | 0
Fair Market Value | $ 5,026,917 | $ 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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