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Investments (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Summary of investments |  |
Cost | $ 84,620,013 | $ 53,327,364
Gross Unrealized Gains | 4,085 | 2,737
Gross Unrealized Losses | (328,277) | (254,127)
Fair Market Value | 84,295,821 | 53,075,974
Mutual funds [Member] |  |
Summary of investments |  |
Cost | 58,532,030 | 29,487,758
Gross Unrealized Gains | 0 | 2,667
Gross Unrealized Losses | (296,239) | (216,790)
Fair Market Value | 58,235,791 | 29,273,635
US corporate debt securities [Member] |  |
Summary of investments |  |
Cost | 25,983,647 | 23,839,606
Gross Unrealized Gains | 4,085 | 70
Gross Unrealized Losses | (31,741) | (37,337)
Fair Market Value | 25,955,991 | $ 23,802,339
Municipal bonds [Member] |  |
Summary of investments |  |
Cost | 104,336 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (297) |
Fair Market Value | $ 104,039 |
Maximum [Member] | US corporate debt securities [Member] |  |
Summary of investments |  |
Contractual maturity, less than | 2 years | 2 years
Maximum [Member] | Municipal bonds [Member] |  |
Summary of investments |  |
Contractual maturity, less than | 1 year |

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