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Investments (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Investments |  |
Cost | $ 5,352,284 | $ 6,406,062
Gross Unrealized Gains | 31,925 | 2,162
Gross Unrealized Losses | 1,348 | 58,309
Fair Value | 5,382,861 | 6,349,915
U.S. corporations |  |
Investments |  |
Cost | 4,433,867 | 5,487,645
Gross Unrealized Gains | 20,611 |
Gross Unrealized Losses | 1,348 | 58,309
Fair Value | 4,453,130 | 5,429,336
International corporations |  |
Investments |  |
Cost | 918,417 | 918,417
Gross Unrealized Gains | 11,314 | 2,162
Fair Value | $ 929,731 | $ 920,579

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