Fair Value Measurements (Details) - USD ($) |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Fair Value Measurements | ||
| Fair value assets, amount transferred between measurement levels | $ 0 | $ 0 |
| Fair value liabilities, amount transferred between measurement levels | 0 | 0 |
| Recurring | ||
| Fair Value Measurements | ||
| Total | 7,602,204 | 7,913,793 |
| Recurring | U.S. corporations | ||
| Fair Value Measurements | ||
| Total | 6,107,960 | 6,406,219 |
| Recurring | International corporations | ||
| Fair Value Measurements | ||
| Total | 1,494,244 | 1,507,574 |
| Recurring | Significant Other Observable Inputs (Level 2) | ||
| Fair Value Measurements | ||
| Total | 7,602,204 | 7,913,793 |
| Recurring | Significant Other Observable Inputs (Level 2) | U.S. corporations | ||
| Fair Value Measurements | ||
| Total | 6,107,960 | 6,406,219 |
| Recurring | Significant Other Observable Inputs (Level 2) | International corporations | ||
| Fair Value Measurements | ||
| Total | $ 1,494,244 | $ 1,507,574 |