Investments (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Cost | $ 7,691,541 | $ 7,948,486 |
| Gross Unrealized Losses | 89,337 | 34,693 |
| Fair Value | 7,602,204 | 7,913,793 |
| Cost | ||
| Less than 1 year | 4,660,286 | |
| 1 to 3 years | 3,031,255 | |
| Fair Value | ||
| Less than 1 year | 4,592,680 | |
| 1 to 3 years | 3,009,524 | |
| U.S. corporations | ||
| Cost | 6,176,341 | 6,433,286 |
| Gross Unrealized Losses | 68,381 | 27,067 |
| Fair Value | 6,107,960 | 6,406,219 |
| International corporations | ||
| Cost | 1,515,200 | 1,515,200 |
| Gross Unrealized Losses | 20,956 | 7,626 |
| Fair Value | $ 1,494,244 | $ 1,507,574 |