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Investments (Details) (USD $) |  |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Mutual funds [Member] | Dec. 31, 2013 Mutual funds [Member] | Mar. 31, 2014 Municipal bonds [Member] | Dec. 31, 2013 Municipal bonds [Member] | Mar. 31, 2014 Maximum [Member] Municipal bonds [Member] | Mar. 31, 2013 Maximum [Member] Municipal bonds [Member]
Summary of investments |  |  |  |  |  |  |  |
Contractual Maturity |  |  |  |  |  |  | 1 year | 1 year
Cost | $ 18,083,302 | $ 18,983,662 | $ 17,278,158 | $ 18,178,518 | $ 805,144 | $ 805,144 |  |
Gross Unrealized Gains | 0 | 560 | 0 | 0 | 0 | 560 |  |
Gross Unrealized Losses | (71,810) | (78,614) | (71,638) | (78,614) | (172) | 0 |  |
Fair Market Value | $ 18,011,492 | $ 18,905,608 | $ 17,206,520 | $ 18,099,904 | $ 804,972 | $ 805,704 |  |

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