Investments (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Investments | ||
| Cost | $ 8,025,940 | $ 7,691,541 |
| Gross Unrealized Gains | 2,626 | |
| Gross Unrealized Losses | 63,045 | 89,337 |
| Fair Value | 7,965,521 | 7,602,204 |
| Cost | ||
| Less than 1 year | 2,503,313 | |
| 1 to 3 years | 4,901,553 | |
| 3 to 5 years | 621,074 | |
| Fair Value | ||
| Less than 1 year | 2,495,449 | |
| 1 to 3 years | 4,863,174 | |
| 3 to 5 years | 606,898 | |
| U.S. corporations | ||
| Investments | ||
| Cost | 6,814,295 | 6,176,341 |
| Gross Unrealized Gains | 385 | |
| Gross Unrealized Losses | 52,072 | 68,381 |
| Fair Value | 6,762,608 | 6,107,960 |
| International corporations | ||
| Investments | ||
| Cost | 1,211,645 | 1,515,200 |
| Gross Unrealized Gains | 2,241 | |
| Gross Unrealized Losses | 10,973 | 20,956 |
| Fair Value | $ 1,202,913 | $ 1,494,244 |